红色小圆点消息提示之BadgeView

在app中随处可见具有中国红特色的小圆点，比如电商项目的购物车、通讯项目的消息列表等等。

第三方控件BadgeView可以简单粗暴实现。

效果图：

1.布局

2.初始化布局

      textView1 = (TextView) findViewById(R.id.textView1);
      textView2 = (TextView) findViewById(R.id.textView2);
      imageView = (ImageView) findViewById(R.id.imageView);
  
 

      //初始化BadgeView，1.上下文，2.显示对象
      final BadgeView badgeTextView1 = new BadgeView(this, textView1);
      BadgeView badgeTextView2 = new BadgeView(this, textView2);
      BadgeView badgeImageView = new BadgeView(this, imageView);
  
 

4.设置BadgeView属性

      badgeTextView1.setBadgeBackgroundColor(Color.RED);//设置背景颜色
      badgeTextView1.setBadgeMargin(5);//设置margin
      badgeTextView1.setBadgePosition(BadgeView.POSITION_TOP_RIGHT);//设置显示的位置
  
 

5.设置显示内容

      	count = 1;
              if (count > 0) {
                  if (count < 99) {
                      badgeTextView1.setText(count + "");//设置显示的内容
                  } else {
                      badgeTextView1.setText("99+");
                  }
                  badgeTextView1.setTextSize(10);//设置字体大小
                  badgeTextView1.setTextColor(Color.WHITE);//设置字体颜色
                  badgeTextView1.show();//显示
              } else {
                  badgeTextView1.hide();//隐藏
              }
  
 

6.设置点击（强迫症的必须点击消失。。。）

      //设置点击
              badgeTextView1.setOnClickListener(new View.OnClickListener() {
                  @Override
                  public void onClick(View v) {
                      // 1
                      // 设置进入的移动动画，设置了插值器，可以实现颤动的效果
                      TranslateAnimation anim1 = new TranslateAnimation(0, 0, 0, 0);
                      anim1.setInterpolator(new BounceInterpolator());
                      // 设置动画的持续时间
                      anim1.setDuration(500);
                      // 设置退出的移动动画
                      TranslateAnimation anim2 = new TranslateAnimation(0, 0, 0, 0);
                      anim2.setDuration(500);
                      badgeTextView1.toggle(anim1, anim2);
                      // 2
                      //badgeTextView1.toggle(true);
                      // 3
                      //badgeTextView1.hide();
                  }
              });
  
 

7.BadgeView

可copy直接用，再加一个attrs.xml文件

      <?xml version="1.0" encoding="utf-8"?>
      <resources>
         <declare-styleable name="CircleImageView">
             <attr name="border_width" format="dimension"/>
             <attr name="border_color" format="color"/>
         </declare-styleable>
      </resources>
  
 

      package com.yechaoa.badgeviewdemo;
      import android.content.Context;
      import android.content.res.Resources;
      import android.graphics.Color;
      import android.graphics.Typeface;
      import android.graphics.drawable.ShapeDrawable;
      import android.graphics.drawable.shapes.RoundRectShape;
      import android.util.AttributeSet;
      import android.util.TypedValue;
      import android.view.Gravity;
      import android.view.View;
      import android.view.ViewGroup;
      import android.view.ViewGroup.LayoutParams;
      import android.view.ViewParent;
      import android.view.animation.AccelerateInterpolator;
      import android.view.animation.AlphaAnimation;
      import android.view.animation.Animation;
      import android.view.animation.DecelerateInterpolator;
      import android.widget.FrameLayout;
      import android.widget.TabWidget;
      import android.widget.TextView;
      /**
       * A simple text label view that can be applied as a "badge" to any given {@link View}.
       * This class is intended to be instantiated at runtime rather than included in XML layouts.
       *
       * @author Jeff Gilfelt
       */
      public class BadgeView extends TextView {
     	public static final int POSITION_TOP_LEFT = 1;
     	public static final int POSITION_TOP_RIGHT = 2;
     	public static final int POSITION_BOTTOM_LEFT = 3;
     	public static final int POSITION_BOTTOM_RIGHT = 4;
     	public static final int POSITION_CENTER = 5;
     	private static final int DEFAULT_MARGIN_DIP = 5;
     	private static final int DEFAULT_LR_PADDING_DIP = 5;
     	private static final int DEFAULT_CORNER_RADIUS_DIP = 8;
     	private static final int DEFAULT_POSITION = POSITION_TOP_RIGHT;
     	private static final int DEFAULT_BADGE_COLOR = Color.parseColor("#CCFF0000"); //Color.RED;
     	private static final int DEFAULT_TEXT_COLOR = Color.WHITE;
     	private static Animation fadeIn;
     	private static Animation fadeOut;
     	private Context context;
     	private View target;
     	private int badgePosition;
     	private int badgeMarginH;
     	private int badgeMarginV;
     	private int badgeColor;
     	private boolean isShown;
     	private ShapeDrawable badgeBg;
     	private int targetTabIndex;
     	public BadgeView(Context context) {
     		this(context, (AttributeSet) null, android.R.attr.textViewStyle);
      	}
     	public BadgeView(Context context, AttributeSet attrs) {
     		 this(context, attrs, android.R.attr.textViewStyle);
      	}
     	/**
       * Constructor -
       *
       * create a new BadgeView instance attached to a target {@link View}.
       *
       * @param context context for this view.
       * @param target the View to attach the badge to.
       */
     	public BadgeView(Context context, View target) {
     		 this(context, null, android.R.attr.textViewStyle, target, 0);
      	}
     	/**
       * Constructor -
       *
       * create a new BadgeView instance attached to a target {@link TabWidget}
       * tab at a given index.
       *
       * @param context context for this view.
       * @param target the TabWidget to attach the badge to.
       * @param index the position of the tab within the target.
       */
     	public BadgeView(Context context, TabWidget target, int index) {
     		this(context, null, android.R.attr.textViewStyle, target, index);
      	}
     	public BadgeView(Context context, AttributeSet attrs, int defStyle) {
     		this(context, attrs, defStyle, null, 0);
      	}
     	public BadgeView(Context context, AttributeSet attrs, int defStyle, View target, int tabIndex) {
     		super(context, attrs, defStyle);
      		init(context, target, tabIndex);
      	}
     	private void init(Context context, View target, int tabIndex) {
     		this.context = context;
     		this.target = target;
     		this.targetTabIndex = tabIndex;
     		// apply defaults
      		badgePosition = DEFAULT_POSITION;
      		badgeMarginH = dipToPixels(DEFAULT_MARGIN_DIP);
      		badgeMarginV = badgeMarginH;
      		badgeColor = DEFAULT_BADGE_COLOR;
      		setTypeface(Typeface.DEFAULT_BOLD);
     		int paddingPixels = dipToPixels(DEFAULT_LR_PADDING_DIP);
      		setPadding(paddingPixels, 0, paddingPixels, 0);
      		setTextColor(DEFAULT_TEXT_COLOR);
      		fadeIn = new AlphaAnimation(0, 1);
      		fadeIn.setInterpolator(new DecelerateInterpolator());
      		fadeIn.setDuration(200);
      		fadeOut = new AlphaAnimation(1, 0);
      		fadeOut.setInterpolator(new AccelerateInterpolator());
      		fadeOut.setDuration(200);
      		isShown = false;
     		if (this.target != null) {
      			applyTo(this.target);
      		} else {
      			show();
      		}
      	}
     	private void applyTo(View target) {
     		LayoutParams lp = target.getLayoutParams();
     		ViewParent parent = target.getParent();
     		FrameLayout container = new FrameLayout(context);
     		if (target instanceof TabWidget) {
     			// set target to the relevant tab child container
      			target = ((TabWidget) target).getChildTabViewAt(targetTabIndex);
     			this.target = target;
      			((ViewGroup) target).addView(container,
     					new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
     			this.setVisibility(View.GONE);
      			container.addView(this);
      		} else {
     			// TODO verify that parent is indeed a ViewGroup
     			ViewGroup group = (ViewGroup) parent;
     			int index = group.indexOfChild(target);
      			group.removeView(target);
      			group.addView(container, index, lp);
      			container.addView(target);
     			this.setVisibility(View.GONE);
      			container.addView(this);
      			group.invalidate();
      		}
      	}
     	/**
       * Make the badge visible in the UI.
       *
       */
     	public void show() {
      		show(false, null);
      	}
     	/**
       * Make the badge visible in the UI.
       *
       * @param animate flag to apply the default fade-in animation.
       */
     	public void show(boolean animate) {
      		show(animate, fadeIn);
      	}
     	/**
       * Make the badge visible in the UI.
       *
       * @param anim Animation to apply to the view when made visible.
       */
     	public void show(Animation anim) {
      		show(true, anim);
      	}
     	/**
       * Make the badge non-visible in the UI.
       *
       */
     	public void hide() {
      		hide(false, null);
      	}
     	/**
       * Make the badge non-visible in the UI.
       *
       * @param animate flag to apply the default fade-out animation.
       */
     	public void hide(boolean animate) {
      		hide(animate, fadeOut);
      	}
     	/**
       * Make the badge non-visible in the UI.
       *
       * @param anim Animation to apply to the view when made non-visible.
       */
     	public void hide(Animation anim) {
      		hide(true, anim);
      	}
     	/**
       * Toggle the badge visibility in the UI.
       *
       */
     	public void toggle() {
      		toggle(false, null, null);
      	}
     	/**
       * Toggle the badge visibility in the UI.
       *
       * @param animate flag to apply the default fade-in/out animation.
       */
     	public void toggle(boolean animate) {
      		toggle(animate, fadeIn, fadeOut);
      	}
     	/**
       * Toggle the badge visibility in the UI.
       *
       * @param animIn Animation to apply to the view when made visible.
       * @param animOut Animation to apply to the view when made non-visible.
       */
     	public void toggle(Animation animIn, Animation animOut) {
      		toggle(true, animIn, animOut);
      	}
     	private void show(boolean animate, Animation anim) {
     		if (getBackground() == null) {
     			if (badgeBg == null) {
      				badgeBg = getDefaultBackground();
      			}
      			setBackgroundDrawable(badgeBg);
      		}
      		applyLayoutParams();
     		if (animate) {
     			this.startAnimation(anim);
      		}
     		this.setVisibility(View.VISIBLE);
      		isShown = true;
      	}
     	private void hide(boolean animate, Animation anim) {
     		this.setVisibility(View.GONE);
     		if (animate) {
     			this.startAnimation(anim);
      		}
      		isShown = false;
      	}
     	private void toggle(boolean animate, Animation animIn, Animation animOut) {
     		if (isShown) {
      			hide(animate && (animOut != null), animOut);
      		} else {
      			show(animate && (animIn != null), animIn);
      		}
      	}
     	/**
       * Increment the numeric badge label. If the current badge label cannot be converted to
       * an integer value, its label will be set to "0".
       *
       * @param offset the increment offset.
       */
     	public int increment(int offset) {
     		CharSequence txt = getText();
     		int i;
     		if (txt != null) {
     			try {
      				i = Integer.parseInt(txt.toString());
      			} catch (NumberFormatException e) {
      				i = 0;
      			}
      		} else {
      			i = 0;
      		}
      		i = i + offset;
      		setText(String.valueOf(i));
     		return i;
      	}
     	/**
       * Decrement the numeric badge label. If the current badge label cannot be converted to
       * an integer value, its label will be set to "0".
       *
       * @param offset the decrement offset.
       */
     	public int decrement(int offset) {
     		return increment(-offset);
      	}
     	private ShapeDrawable getDefaultBackground() {
     		int r = dipToPixels(DEFAULT_CORNER_RADIUS_DIP);
     		float[] outerR = new float[] {r, r, r, r, r, r, r, r};
     		RoundRectShape rr = new RoundRectShape(outerR, null, null);
     		ShapeDrawable drawable = new ShapeDrawable(rr);
      		drawable.getPaint().setColor(badgeColor);
     		return drawable;
      	}
     	private void applyLayoutParams() {
      		FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
     		switch (badgePosition) {
     		case POSITION_TOP_LEFT:
      			lp.gravity = Gravity.LEFT | Gravity.TOP;
      			lp.setMargins(badgeMarginH, badgeMarginV, 0, 0);
     			break;
     		case POSITION_TOP_RIGHT:
      			lp.gravity = Gravity.RIGHT | Gravity.TOP;
      			lp.setMargins(0, badgeMarginV, badgeMarginH, 0);
     			break;
     		case POSITION_BOTTOM_LEFT:
      			lp.gravity = Gravity.LEFT | Gravity.BOTTOM;
      			lp.setMargins(badgeMarginH, 0, 0, badgeMarginV);
     			break;
     		case POSITION_BOTTOM_RIGHT:
      			lp.gravity = Gravity.RIGHT | Gravity.BOTTOM;
      			lp.setMargins(0, 0, badgeMarginH, badgeMarginV);
     			break;
     		case POSITION_CENTER:
      			lp.gravity = Gravity.CENTER;
      			lp.setMargins(0, 0, 0, 0);
     			break;
     		default:
     			break;
      		}
      		setLayoutParams(lp);
      	}
     	/**
       * Returns the target View this badge has been attached to.
       *
       */
     	public View getTarget() {
     		return target;
      	}
     	/**
       * Is this badge currently visible in the UI?
       *
       */
     	@Override
     	public boolean isShown() {
     		return isShown;
      	}
     	/**
       * Returns the positioning of this badge.
       *
       * one of POSITION_TOP_LEFT, POSITION_TOP_RIGHT, POSITION_BOTTOM_LEFT, POSITION_BOTTOM_RIGHT, POSTION_CENTER.
       *
       */
     	public int getBadgePosition() {
     		return badgePosition;
      	}
     	/**
       * Set the positioning of this badge.
       *
       * @param layoutPosition one of POSITION_TOP_LEFT, POSITION_TOP_RIGHT, POSITION_BOTTOM_LEFT, POSITION_BOTTOM_RIGHT, POSTION_CENTER.
       *
       */
     	public void setBadgePosition(int layoutPosition) {
     		this.badgePosition = layoutPosition;
      	}
     	/**
       * Returns the horizontal margin from the target View that is applied to this badge.
       *
       */
     	public int getHorizontalBadgeMargin() {
     		return badgeMarginH;
      	}
     	/**
       * Returns the vertical margin from the target View that is applied to this badge.
       *
       */
     	public int getVerticalBadgeMargin() {
     		return badgeMarginV;
      	}
     	/**
       * Set the horizontal/vertical margin from the target View that is applied to this badge.
       *
       * @param badgeMargin the margin in pixels.
       */
     	public void setBadgeMargin(int badgeMargin) {
     		this.badgeMarginH = badgeMargin;
     		this.badgeMarginV = badgeMargin;
      	}
     	/**
       * Set the horizontal/vertical margin from the target View that is applied to this badge.
       *
       * @param horizontal margin in pixels.
       * @param vertical margin in pixels.
       */
     	public void setBadgeMargin(int horizontal, int vertical) {
     		this.badgeMarginH = horizontal;
     		this.badgeMarginV = vertical;
      	}
     	/**
       * Returns the color value of the badge background.
       *
       */
     	public int getBadgeBackgroundColor() {
     		return badgeColor;
      	}
     	/**
       * Set the color value of the badge background.
       *
       * @param badgeColor the badge background color.
       */
     	public void setBadgeBackgroundColor(int badgeColor) {
     		this.badgeColor = badgeColor;
      		badgeBg = getDefaultBackground();
      	}
     	private int dipToPixels(int dip) {
     		Resources r = getResources();
     		float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dip, r.getDisplayMetrics());
     		return (int) px;
      	}
      }
  
 

BadgeView下载：https://github.com/stefanjauker/BadgeView

文章来源: blog.csdn.net，作者：yechaoa，版权归原作者所有，如需转载，请联系作者。

原文链接：blog.csdn.net/yechaoa/article/details/53236418