Android 实现水印背景效果
【摘要】
项目中有需要加水印的需求，实现完效果图是这样的
什么看不清...
为了让大家看清效果，字体改了一下，正常应该是文章最上面那个的效果。话不多说，直接上代码
import android.annotation.SuppressLint;import android.content.Context;import android....
项目中有需要加水印的需求，实现完效果图是这样的
什么看不清...
为了让大家看清效果，字体改了一下，正常应该是文章最上面那个的效果。话不多说，直接上代码
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import android.annotation.SuppressLint;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.Rect;
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import android.graphics.Typeface;
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import android.text.TextPaint;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import android.view.View;
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import com.hkdc.commonlib.R;
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public class WaterMarkView extends View {
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private static final String DEFAULT_SEPARATOR = "///";
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private TextPaint mTextPaint = new TextPaint();
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private String[] mText;
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private int mDegrees;
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private int mTextColor;
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private int mTextSize=35;
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private boolean mTextBold;
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private int mDx;
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private int mDy;
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private Paint.Align mAlign;
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private boolean mSync;
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private int textWidth, textHeight;
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public WaterMarkView(Context context) {
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this(context, null);
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}
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public WaterMarkView(Context context, AttributeSet attrs) {
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super(context, attrs);
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TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.WaterMarkView);
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mDegrees = typedArray.getInt(R.styleable.WaterMarkView_water_mark_degree, WaterMarkManager.INFO != null ? WaterMarkManager.INFO.getDegrees() : -30);
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String text = typedArray.getString(R.styleable.WaterMarkView_water_mark_text);
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if (text != null) {
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mText = text.split(DEFAULT_SEPARATOR);
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}
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mTextColor = typedArray.getColor(R.styleable.WaterMarkView_water_mark_textColor, WaterMarkManager.INFO != null ? WaterMarkManager.INFO.getTextColor() : Color.parseColor("#33000000"));
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mTextSize = typedArray.getDimensionPixelSize(R.styleable.WaterMarkView_water_mark_textSize, WaterMarkManager.INFO != null ? WaterMarkManager.INFO.getTextSize() : 42);
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mTextBold = typedArray.getBoolean(R.styleable.WaterMarkView_water_mark_textBold, WaterMarkManager.INFO != null && WaterMarkManager.INFO.isTextBold());
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mDx = typedArray.getDimensionPixelSize(R.styleable.WaterMarkView_water_mark_dx, WaterMarkManager.INFO != null ? WaterMarkManager.INFO.getDx() : 100);
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mDy = typedArray.getDimensionPixelSize(R.styleable.WaterMarkView_water_mark_dy, WaterMarkManager.INFO != null ? WaterMarkManager.INFO.getDy() : 240);
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int align = typedArray.getInt(R.styleable.WaterMarkView_water_mark_align, WaterMarkManager.INFO != null ? WaterMarkManager.INFO.getAlignInt() : 1);
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mAlign = align == 0 ? Paint.Align.LEFT : align == 2 ? Paint.Align.RIGHT : Paint.Align.CENTER;
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mSync = typedArray.getBoolean(R.styleable.WaterMarkView_water_mark_sync, true);
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typedArray.recycle();
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setBackgroundColor(Color.TRANSPARENT);
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mTextPaint.setAntiAlias(true);
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mTextPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
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mTextPaint.setColor(mTextColor);
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mTextPaint.setTextSize(mTextSize);
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mTextPaint.setTypeface(mTextBold ? Typeface.DEFAULT_BOLD : Typeface.DEFAULT);
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mTextPaint.setTextAlign(mAlign);
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mText = mText == null && mSync ? WaterMarkManager.CONTENT : mText;
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textWidth = 0;
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textHeight = 0;
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if (mText != null && mText.length > 0) {
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for (String s : mText) {
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Rect tvRect = new Rect();
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mTextPaint.getTextBounds(s, 0, s.length(), tvRect);
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textWidth = textWidth > tvRect.width() ? textWidth : tvRect.width();
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textHeight += (tvRect.height() + 10);
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}
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}
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if (mSync) {
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WaterMarkManager.LIST.add(this);
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}
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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}
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@Override
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protected void onDraw(Canvas canvas) {
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super.onDraw(canvas);
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if (mText != null && mText.length > 0) {
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int measuredWidth = getMeasuredWidth();
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int measuredHeight = getMeasuredHeight();
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if (measuredWidth == 0 || measuredHeight == 0) {
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return;
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}
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int canvasLength = measuredWidth > measuredHeight ? measuredWidth : measuredHeight;
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canvas.save();
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canvas.rotate(mDegrees, measuredWidth / 2, measuredHeight / 2);
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canvas.save();
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int y = 0;
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boolean odd = true;
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while (y < canvasLength + textHeight) {
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int x = odd ? 0 : -(textWidth + mDx) / 2;
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while (x < canvasLength + textWidth) {
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drawTexts(mText, mTextPaint, canvas, x, y);
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x = x + textWidth + mDx;
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}
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y = y + textHeight + mDy;
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odd = !odd;
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}
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canvas.restore();
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}
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}
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private void drawTexts(String[] ss, Paint paint, Canvas canvas, int x, int y) {
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Paint.FontMetrics fontMetrics = paint.getFontMetrics();
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float top = fontMetrics.top;
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float bottom = fontMetrics.bottom;
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int length = ss.length;
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float total = (length - 1) * (bottom - top) + (fontMetrics.descent - fontMetrics.ascent);
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float offset = total / 2 - bottom;
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for (int i = 0; i < length; i++) {
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float yAxis = -(length - i - 1) * (bottom - top) + offset;
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canvas.drawText(ss[i], x, y + yAxis + 10, paint);
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}
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}
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/**
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* 设置水印文字内容
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*
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* @param text 文字内容
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*/
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public void setText(String... text) {
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mText = text;
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textWidth = 0;
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textHeight = 0;
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if (mText != null && mText.length > 0) {
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for (String s : mText) {
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Rect tvRect = new Rect();
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mTextPaint.getTextBounds(s, 0, s.length(), tvRect);
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textWidth = textWidth > tvRect.width() ? textWidth : tvRect.width();
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textHeight += (tvRect.height() + 10);
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}
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}
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postInvalidate();
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}
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/**
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* 同步设置水印文字内容
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*
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* @param text 文字内容
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*/
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void setSyncText(String... text) {
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if (mSync) {
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setText(text);
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}
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}
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/**
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* 设置水印倾斜角度
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*
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* @param degrees 倾斜角度(默认:-30)
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*/
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public void setDegrees(int degrees) {
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mDegrees = degrees;
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postInvalidate();
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}
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/**
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* 同步设置水印倾斜角度
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*
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* @param degrees 倾斜角度(默认:-30)
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*/
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void setSyncDegrees(int degrees) {
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if (mSync) {
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setDegrees(degrees);
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}
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}
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/**
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* 设置水印字体颜色
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*
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* @param textColor 字体颜色(默认:#33000000)
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*/
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public void setTextColor(int textColor) {
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mTextColor = textColor;
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mTextPaint.setColor(mTextColor);
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postInvalidate();
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}
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/**
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* 同步设置水印字体颜色
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*
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* @param textColor 字体颜色(默认:#33000000)
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*/
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void setSyncTextColor(int textColor) {
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if (mSync) {
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setTextColor(textColor);
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}
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}
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/**
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* 设置水印字体大小（单位：px）
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*
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* @param textSize 字体大小(默认:42px)
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*/
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public void setTextSize(int textSize) {
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mTextSize = textSize;
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mTextPaint.setTextSize(30);
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postInvalidate();
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}
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/**
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* 同步设置水印字体大小（单位：px）
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*
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* @param textSize 字体大小(默认:42px)
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*/
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void setSyncTextSize(int textSize) {
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if (mSync) {
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setTextSize(30);
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}
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}
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/**
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* 设置水印字体是否粗体
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*
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* @param textBold 是否粗体(默认:false)
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*/
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public void setTextBold(boolean textBold) {
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mTextBold = textBold;
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mTextPaint.setTypeface(mTextBold ? Typeface.DEFAULT_BOLD : Typeface.DEFAULT);
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postInvalidate();
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}
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/**
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* 同步设置水印字体是否粗体
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*
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* @param textBold 是否粗体(默认:false)
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*/
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void setSyncTextBold(boolean textBold) {
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if (mSync) {
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setTextBold(textBold);
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}
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}
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/**
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* 设置水印X轴偏移量（单位：px）
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*
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* @param dx X轴偏移量(默认:100px)
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*/
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public void setDx(int dx) {
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this.mDx = dx;
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postInvalidate();
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}
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/**
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* 同步设置水印X轴偏移量（单位：px）
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*
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* @param dx X轴偏移量(默认:100px)
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*/
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void setSyncDx(int dx) {
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if (mSync) {
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setDx(dx);
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}
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}
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/**
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* 设置水印Y轴偏移量（单位：px）
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*
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* @param dy Y轴偏移量(默认:240px)
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*/
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public void setDy(int dy) {
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this.mDy = dy;
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postInvalidate();
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}
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/**
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* 同步设置水印Y轴偏移量（单位：px）
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*
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* @param dy Y轴偏移量(默认:240px)
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*/
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void setSignDy(int dy) {
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if (mSync) {
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setDy(dy);
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}
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}
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/**
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* 设置水印对齐方式
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*
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* @param align 对齐方式(默认:Center)
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*/
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public void setAlign(Paint.Align align) {
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this.mAlign = align;
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postInvalidate();
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}
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/**
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* 同步设置水印对齐方式
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*
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* @param align 对齐方式(默认:Center)
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*/
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void setSignAlign(Paint.Align align) {
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if (mSync) {
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setAlign(align);
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}
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}
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/**
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* 销毁相关页面时调用（切记）
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*/
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public void onDestroy() {
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if (mSync) {
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WaterMarkManager.LIST.remove(this);
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}
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}
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@Override
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public boolean dispatchTouchEvent(MotionEvent event) {
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return false;
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}
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@SuppressLint("ClickableViewAccessibility")
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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return false;
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}
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}
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<!--warkmark-->
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<declare-styleable name="WaterMarkView">
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<attr name="water_mark_degree" format="integer|reference" />
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<attr name="water_mark_text" format="string|reference" />
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<attr name="water_mark_textColor" format="color|reference" />
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<attr name="water_mark_textSize" format="dimension|reference" />
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<attr name="water_mark_textBold" format="boolean" />
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<attr name="water_mark_dx" format="dimension|reference" />
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<attr name="water_mark_dy" format="dimension|reference" />
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<attr name="water_mark_align" format="dimension">
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<enum name="LEFT" value="0" />
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<enum name="CENTER" value="1" />
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<enum name="RIGHT" value="2" />
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</attr>
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<attr name="water_mark_sync" format="boolean" />
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</declare-styleable>
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package com.hkdc.commonlib.warkmark;
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import android.annotation.SuppressLint;
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import android.app.Activity;
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import android.graphics.Paint;
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import android.view.LayoutInflater;
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import com.hkdc.commonlib.R;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* @author Leon (wshk729@163.com)
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* @date 2018/8/24
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* <p>
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*/
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public class WaterMarkManager {
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static WaterMarkInfo INFO = null;
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static String[] CONTENT = null;
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static List<WaterMarkView> LIST = new ArrayList<>();
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/**
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* 设置水印全局配置信息
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*
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* @param info 配置信息
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*/
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public static void setInfo(WaterMarkInfo info) {
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INFO = info;
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}
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/**
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* 获取一个满屏水印View
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*
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* @param activity activity
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*/
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@SuppressLint("InflateParams")
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public static WaterMarkView getView(Activity activity) {
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return (WaterMarkView) LayoutInflater.from(activity).inflate(R.layout.view_water_mark, null);
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}
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/**
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* WaterMarkInfo初始化判断
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*/
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private static void assertInitialized() {
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if (INFO == null) {
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INFO = WaterMarkInfo.create().generate();
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}
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}
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/**
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* 同步设置全部水印文字信息
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*
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* @param content 文字信息
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*/
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public static void setText(String... content) {
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assertInitialized();
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CONTENT = content;
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if (LIST.size() > 0) {
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for (WaterMarkView view : LIST) {
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if (view != null) {
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view.setSyncText(content);
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}
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}
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}
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}
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/**
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* 同步设置全部水印倾斜角度
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*
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* @param degrees 倾斜角度(默认:-30)
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*/
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public static void setDegrees(int degrees) {
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assertInitialized();
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INFO.setDegrees(degrees);
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if (LIST.size() > 0) {
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for (WaterMarkView view : LIST) {
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if (view != null) {
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view.setSyncDegrees(degrees);
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}
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}
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}
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}
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/**
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* 同步设置全部水印字体颜色
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*
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* @param textColor 字体颜色(默认:#33000000)
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*/
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public static void setTextColor(int textColor) {
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assertInitialized();
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INFO.setTextColor(textColor);
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if (LIST.size() > 0) {
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for (WaterMarkView view : LIST) {
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if (view != null) {
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view.setSyncTextColor(textColor);
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}
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}
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}
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}
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/**
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* 同步设置全部水印字体大小（单位：px）
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*
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* @param textSize 字体大小(默认:42px)
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*/
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public static void setTextSize(int textSize) {
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assertInitialized();
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INFO.setTextSize(textSize);
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if (LIST.size() > 0) {
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for (WaterMarkView view : LIST) {
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if (view != null) {
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view.setSyncTextSize(textSize);
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}
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}
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}
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}
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/**
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* 同步设置全部水印字体是否粗体
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*
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* @param textBold 是否粗体(默认:false)
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*/
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public static void setTextBold(boolean textBold) {
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assertInitialized();
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INFO.setTextBold(textBold);
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if (LIST.size() > 0) {
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for (WaterMarkView view : LIST) {
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if (view != null) {
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view.setSyncTextBold(textBold);
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}
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}
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}
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}
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/**
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* 同步设置全部水印X轴偏移量（单位：px）
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*
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* @param dx X轴偏移量(默认:100px)
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*/
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public static void setDx(int dx) {
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assertInitialized();
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INFO.setDx(dx);
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if (LIST.size() > 0) {
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for (WaterMarkView view : LIST) {
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if (view != null) {
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view.setSyncDx(dx);
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}
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}
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}
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}
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/**
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* 同步设置全部水印Y轴偏移量（单位：px）
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*
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* @param dy Y轴偏移量(默认:240px)
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*/
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public static void setDy(int dy) {
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assertInitialized();
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INFO.setDy(dy);
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if (LIST.size() > 0) {
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for (WaterMarkView view : LIST) {
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if (view != null) {
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view.setSignDy(dy);
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}
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}
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}
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}
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/**
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* 同步设置全部水印对齐方式
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*
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* @param align 对齐方式(默认:Center)
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*/
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public static void setAlign(Paint.Align align) {
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assertInitialized();
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INFO.setAlign(align);
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if (LIST.size() > 0) {
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for (WaterMarkView view : LIST) {
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if (view != null) {
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view.setSignAlign(align);
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}
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}
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}
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}
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}
view_water_mark.xml
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<?xml version="1.0" encoding="utf-8"?>
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<com.commonlib.WaterMarkView
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xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
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android:layout_height="match_parent"/>
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import android.graphics.Color;
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import android.graphics.Paint;
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/**
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* @author Leon (wshk729@163.com)
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* @date 2018/8/24
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* <p>
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*/
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public class WaterMarkInfo {
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private int mDegrees;
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private int mTextColor;
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private int mTextSize;
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private boolean mTextBold;
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private int mDx;
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private int mDy;
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private Paint.Align mAlign;
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private WaterMarkInfo(int degrees, int textColor, int textSize, boolean textBold, int dx, int dy, Paint.Align align) {
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mDegrees = degrees;
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mTextColor = textColor;
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mTextSize = textSize;
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mTextBold = textBold;
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mDx = dx;
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mDy = dy;
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mAlign = align;
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}
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public int getDegrees() {
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return mDegrees;
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}
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public int getTextColor() {
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return mTextColor;
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}
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public int getTextSize() {
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return mTextSize;
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}
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public int getDx() {
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return mDx;
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}
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public int getDy() {
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return mDy;
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}
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public Paint.Align getAlign() {
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return mAlign;
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}
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public int getAlignInt() {
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switch (mAlign) {
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case LEFT:
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return 0;
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case RIGHT:
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return 2;
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default:
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return 1;
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}
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}
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public boolean isTextBold() {
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return mTextBold;
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}
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void setDegrees(int degrees) {
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mDegrees = degrees;
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}
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void setTextColor(int textColor) {
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mTextColor = textColor;
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}
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void setTextSize(int textSize) {
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mTextSize = textSize;
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}
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void setTextBold(boolean textBold) {
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mTextBold = textBold;
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}
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void setDx(int dx) {
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mDx = dx;
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}
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void setDy(int dy) {
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mDy = dy;
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}
-
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void setAlign(Paint.Align align) {
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this.mAlign = align;
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}
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public static Builder create() {
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return new Builder();
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}
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public static class Builder {
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private int mDegrees;
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private int mTextColor;
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private int mTextSize;
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private boolean mTextBold;
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private int mDx;
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private int mDy;
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private Paint.Align mAlign;
-
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private Builder() {
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mDegrees = -30;
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mTextColor = Color.parseColor("#33000000");
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mTextSize = 35;
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mTextBold = false;
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mDx = 100;
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mDy = 240;
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mAlign = Paint.Align.CENTER;
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}
-
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/**
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* 设置水印文字倾斜度
-
*
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* @param degrees 文字倾斜度(默认:-30)
-
* @return Builder
-
*/
-
public Builder setDegrees(int degrees) {
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mDegrees = degrees;
-
return this;
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}
-
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/**
-
* 设置水印文字颜色
-
*
-
* @param textColor 文字颜色(默认:#33000000)
-
* @return Builder
-
*/
-
public Builder setTextColor(int textColor) {
-
mTextColor = textColor;
-
return this;
-
}
-
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/**
-
* 设置水印文字大小（单位：px）
-
*
-
* @param textSize 文字大小(默认:42px)
-
* @return Builder
-
*/
-
public Builder setTextSize(int textSize) {
-
mTextSize = textSize;
-
return this;
-
}
-
-
/**
-
* 设置水印文字是否加粗
-
*
-
* @param textBold 文字加粗(默认:false)
-
* @return Builder
-
*/
-
public Builder setTextBold(boolean textBold) {
-
mTextBold = textBold;
-
return this;
-
}
-
-
/**
-
* 设置水印文字X轴间距（单位：px）
-
*
-
* @param dx 文字X轴间距(默认:100px)
-
* @return Builder
-
*/
-
public Builder setDx(int dx) {
-
mDx = dx;
-
return this;
-
}
-
-
/**
-
* 设置水印文字Y轴间距（单位：px）
-
*
-
* @param dy 文字Y轴间距(默认:240px)
-
* @return Builder
-
*/
-
public Builder setDy(int dy) {
-
mDy = dy;
-
return this;
-
}
-
-
/**
-
* 设置水印文字对齐方式
-
*
-
* @param align 对齐方式(默认:Center)
-
* @return Builder
-
*/
-
public Builder setAlign(Paint.Align align) {
-
mAlign = align;
-
return this;
-
}
-
-
/**
-
* 生成水印全局配置信息
-
*
-
* @return 配置信息
-
*/
-
public WaterMarkInfo generate() {
-
return new WaterMarkInfo(mDegrees, mTextColor, mTextSize, mTextBold, mDx, mDy, mAlign);
-
}
-
}
-
-
}
-
import android.content.Context;
-
import android.graphics.Canvas;
-
import android.graphics.Color;
-
import android.graphics.ColorFilter;
-
import android.graphics.Paint;
-
import android.graphics.PixelFormat;
-
import android.graphics.drawable.Drawable;
-
import android.support.annotation.IntRange;
-
import android.support.annotation.NonNull;
-
import android.support.annotation.Nullable;
-
-
import java.util.List;
-
-
public class WaterMarkBg extends Drawable {
-
private Paint paint = new Paint();
-
private List<String> labels;
-
private Context context;
-
private int degress;//角度
-
private int fontSize;//字体大小 单位sp
-
-
/**
-
* 初始化构造
-
* @param context 上下文
-
* @param labels 水印文字列表 多行显示支持
-
* @param degress 水印角度
-
* @param fontSize 水印文字大小
-
*/
-
public WaterMarkBg(Context context, List<String> labels, int degress, int fontSize) {
-
this.labels = labels;
-
this.context = context;
-
this.degress = degress;
-
this.fontSize = fontSize;
-
}
-
-
@Override
-
public void draw(@NonNull Canvas canvas) {
-
-
-
int width = getBounds().right;
-
int height = getBounds().bottom;
-
-
canvas.drawColor(Color.parseColor("#40F3F5F9"));
-
paint.setColor(Color.parseColor("#50AEAEAE"));
-
-
paint.setAntiAlias(true);
-
paint.setTextSize(sp2px(context,fontSize));
-
canvas.save();
-
canvas.rotate(degress);
-
float textWidth = paint.measureText(labels.get(0));
-
int index = 0;
-
for (int positionY = height / 10; positionY <= height; positionY += height / 10+80) {
-
float fromX = -width + (index++ % 2) * textWidth;
-
for (float positionX = fromX; positionX < width; positionX += textWidth * 2) {
-
int spacing = 0;//间距
-
for(String label:labels){
-
canvas.drawText(label, positionX, positionY+spacing, paint);
-
spacing = spacing+50;
-
}
-
-
}
-
}
-
canvas.restore();
-
}
-
-
@Override
-
public void setAlpha(@IntRange(from = 0, to = 255) int alpha) {
-
-
}
-
-
@Override
-
public void setColorFilter(@Nullable ColorFilter colorFilter) {
-
-
}
-
-
@Override
-
public int getOpacity() {
-
return PixelFormat.UNKNOWN;
-
}
-
-
-
public static int sp2px(Context context, float spValue) {
-
final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
-
return (int) (spValue * fontScale + 0.5f);
-
}
-
}
xml中 引用
-
<com.commonlib.WaterMarkView
-
android:singleLine="false"
-
android:id="@+id/wm"
-
android:layout_width="match_parent"
-
android:layout_height="match_parent"
-
app:water_mark_align="CENTER"
-
app:water_mark_degree="-30"
-
app:water_mark_dx="100px"
-
app:water_mark_dy="240px"
-
app:water_mark_sync="true"
-
app:water_mark_text="再见孙悟空"
-
app:water_mark_textBold="false"
-
app:water_mark_textColor="@color/black"
-
app:water_mark_textSize="30px" />
activity中
-
private WaterMarkView wm;
-
-
wm = (WaterMarkView) findViewById(R.id.wm);
-
-
private void water() {
-
SharedPreferences jobcede = getSharedPreferences("jobcede", MODE_PRIVATE);
-
String userName = jobcede.getString("username", "");
-
String name = jobcede.getString("name", "");
-
wm.setText(name,userName);
-
}
核心的代码就这些，因为时间关系，完整的demo后续补充。希望对大家有所帮助。欢迎各位小伙伴加入我的qq群：开发一群：454430053 （付费）开发二群：537532956 （付费）开发三群：812695329（免费）这里已经有很多小伙伴在等你了，快来加入我们吧！
文章来源: wukong.blog.csdn.net，作者：再见孙悟空_，版权归原作者所有，如需转载，请联系作者。
原文链接：wukong.blog.csdn.net/article/details/109849305
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