简单的手指绘图并保存所绘图片【源码】

  

   

    

     

    
    

     

      public class SimpleFingerDraw extends Activity implements OnTouchListener,
     
    
   

    

     

    
    

     

      		OnClickListener
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      	ImageView imageView;
     
    
   

    

     

    
    

     

      	Button choosePicture, savePicture;
     
    
   

    

     

    
    

     

      	Bitmap bitmap;
     
    
   

    

     

    
    

     

      	Bitmap alteredBitmap;
     
    
   

    

     

    
    

     

      	Canvas canvas;
     
    
   

    

     

    
    

     

      	Paint paint;
     
    
   

    

     

    
    

     

      	Matrix matrix;
     
    
   

    

     

    
    

     
	float downx = 0;
     
    
   

    

     

    
    

     
	float downy = 0;
     
    
   

    

     

    
    

     
	float upx = 0;
     
    
   

    

     

    
    

     
	float upy = 0;
     
    
   

    

     

    
    

     
	float top = 0, bottom = 0;
     
    
   

    

     

    
    

     
	String TAG = "FingerDraw";
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	@Override
     
    
   

    

     

    
    

     
	protected void onCreate(Bundle savedInstanceState)
     
    
   

    

     

    
    

     

      	{
     
    
   

    

     

    
    

     
		// TODO Auto-generated method stub
     
    
   

    

     

    
    

     
		super.onCreate(savedInstanceState);
     
    
   

    

     

    
    

     

      		setContentView(R.layout.activity_main);
     
    
   

    

     

    
    

     

      		imageView = (ImageView) findViewById(R.id.ChosenImageView);
     
    
   

    

     

    
    

     

      		choosePicture = (Button) findViewById(R.id.ChoosePictureButton);
     
    
   

    

     

    
    

     

      		savePicture = (Button) findViewById(R.id.SavePictureButton);
     
    
   

    

     

    
    

     

      		choosePicture.setOnClickListener(this);
     
    
   

    

     

    
    

     

      		savePicture.setOnClickListener(this);
     
    
   

    

     

    
    

     

      		savePicture.setVisibility(View.GONE);
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	@Override
     
    
   

    

     

    
    

     
	public boolean onTouch(View v, MotionEvent event)
     
    
   

    

     

    
    

     

      	{
     
    
   

    

     

    
    

     
		// TODO Auto-generated method stub
     
    
   

    

     

    
    

     
		int action = event.getAction();
     
    
   

    

     

    
    

     
		switch (action)
     
    
   

    

     

    
    

     

      		{
     
    
   

    

     

    
    

     
			case MotionEvent.ACTION_DOWN:
     
    
   

    

     

    
    

     

      				downx = event.getX();// 获取的是以ImageView左上角为原点的坐标
     
    
   

    

     

    
    

     

      				downy = event.getY();
     
    
   

    

     

    
    

     

      				Log.e(TAG, "downx:" + downx + " downy:" + downy);
     
    
   

    

     

    
    

     
				break;
     
    
   

    

     

    
    

     
			case MotionEvent.ACTION_MOVE:
     
    
   

    

     

    
    

     

      				upx = event.getX();
     
    
   

    

     

    
    

     

      				upy = event.getY();
     
    
   

    

     

    
    

     

      				canvas.drawLine(downx, downy, upx, upy, paint);
     
    
   

    

     

    
    

     

      				imageView.invalidate();
     
    
   

    

     

    
    

     

      				downx = upx;
     
    
   

    

     

    
    

     

      				downy = upy;
     
    
   

    

     

    
    

     
				break;
     
    
   

    

     

    
    

     
			case MotionEvent.ACTION_UP:
     
    
   

    

     

    
    

     

      				upx = event.getX();
     
    
   

    

     

    
    

     

      				upy = event.getY();
     
    
   

    

     

    
    

     

      				canvas.drawLine(downx, downy, upx, upy, paint);// 注意：这里是以图像的左上角为原点进行绘制直线
     
    
   

    

     

    
    

     

      				imageView.invalidate();
     
    
   

    

     

    
    

     
				break;
     
    
   

    

     

    
    

     
			default:
     
    
   

    

     

    
    

     
				break;
     
    
   

    

     

    
    

     

      		}
     
    
   

    

     

    
    

     
		return true;
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	@Override
     
    
   

    

     

    
    

     
	public void onClick(View v)
     
    
   

    

     

    
    

     

      	{
     
    
   

    

     

    
    

     
		// TODO Auto-generated method stub
     
    
   

    

     

    
    

     
		if (v == choosePicture)
     
    
   

    

     

    
    

     

      		{
     
    
   

    

     

    
    

     
			Intent choosePictureIntent = new Intent(Intent.ACTION_PICK,
     
    
   

    

     

    
    

     

      					Media.EXTERNAL_CONTENT_URI);
     
    
   

    

     

    
    

     

      			startActivityForResult(choosePictureIntent, 0);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      		} else
     
    
   

    

     

    
    

     

      		{
     
    
   

    

     

    
    

     
			if (alteredBitmap != null)
     
    
   

    

     

    
    

     

      			{
     
    
   

    

     

    
    

     
				try
     
    
   

    

     

    
    

     

      				{
     
    
   

    

     

    
    

     
					Uri ImageFileUri = getContentResolver().insert(
     
    
   

    

     

    
    

     

      							Media.EXTERNAL_CONTENT_URI, new ContentValues());
     
    
   

    

     

    
    

     
					OutputStream imageFileOS = getContentResolver()
     
    
   

    

     

    
    

     

      							.openOutputStream(ImageFileUri);
     
    
   

    

     

    
    

     

      					alteredBitmap.compress(CompressFormat.JPEG, 100,
     
    
   

    

     

    
    

     

      							imageFileOS);
     
    
   

    

     

    
    

     

      					Toast.makeText(this, "Saved! ", Toast.LENGTH_LONG).show();
     
    
   

    

     

    
    

     

      				} catch (FileNotFoundException e)
     
    
   

    

     

    
    

     

      				{
     
    
   

    

     

    
    

     
					// TODO Auto-generated catch block
     
    
   

    

     

    
    

     

      					e.printStackTrace();
     
    
   

    

     

    
    

     

      				}
     
    
   

    

     

    
    

     

      			}
     
    
   

    

     

    
    

     

      		}
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	@Override
     
    
   

    

     

    
    

     
	protected void onActivityResult(int requestCode, int resultCode, Intent data)
     
    
   

    

     

    
    

     

      	{
     
    
   

    

     

    
    

     
		// TODO Auto-generated method stub
     
    
   

    

     

    
    

     
		super.onActivityResult(requestCode, resultCode, data);
     
    
   

    

     

    
    

     
		if (resultCode == RESULT_OK)
     
    
   

    

     

    
    

     

      		{
     
    
   

    

     

    
    

     

      			savePicture.setVisibility(View.VISIBLE);
     
    
   

    

     

    
    

     
			Uri imageFileUri = data.getData();
     
    
   

    

     

    
    

     
			Display currentDisplay = getWindowManager().getDefaultDisplay();
     
    
   

    

     

    
    

     
			@SuppressWarnings("deprecation")
     
    
   

    

     

    
    

     
			float dw = currentDisplay.getWidth();
     
    
   

    

     

    
    

     
			@SuppressWarnings("deprecation")
     
    
   

    

     

    
    

     
			float dh = currentDisplay.getHeight();
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      			BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
     
    
   

    

     

    
    

     

      			bmpFactoryOptions.inJustDecodeBounds = true;
     
    
   

    

     

    
    

     
			try
     
    
   

    

     

    
    

     

      			{
     
    
   

    

     

    
    

     

      				bitmap = BitmapFactory
     
    
   

    

     

    
    

     

      						.decodeStream(
     
    
   

    

     

    
    

     

      								getContentResolver().openInputStream(
     
    
   

    

     

    
    

     

      										imageFileUri), null, bmpFactoryOptions);
     
    
   

    

     

    
    

     

      			} catch (FileNotFoundException e)
     
    
   

    

     

    
    

     

      			{
     
    
   

    

     

    
    

     
				// TODO Auto-generated catch block
     
    
   

    

     

    
    

     

      				e.printStackTrace();
     
    
   

    

     

    
    

     

      			}
     
    
   

    

     

    
    

     
			int heightRatio = (int) Math.ceil(bmpFactoryOptions.outHeight / dh);
     
    
   

    

     

    
    

     
			int widthRatio = (int) Math.ceil(bmpFactoryOptions.outWidth / dw);
     
    
   

    

     

    
    

     
			if (heightRatio >= 1 && widthRatio >= 1)
     
    
   

    

     

    
    

     

      			{
     
    
   

    

     

    
    

     
				if (heightRatio > widthRatio)
     
    
   

    

     

    
    

     

      				{
     
    
   

    

     

    
    

     

      					bmpFactoryOptions.inSampleSize = heightRatio;
     
    
   

    

     

    
    

     
					// Log.e(TAG,"heightRatio");
     
    
   

    

     

    
    

     

      				} else
     
    
   

    

     

    
    

     

      				{
     
    
   

    

     

    
    

     

      					bmpFactoryOptions.inSampleSize = widthRatio;
     
    
   

    

     

    
    

     
					// Log.e(TAG,"widthRatio");
     
    
   

    

     

    
    

     

      				}
     
    
   

    

     

    
    

     

      			}
     
    
   

    

     

    
    

     
			// Log.e(TAG,"heightRatio:"+heightRatio+" widthRatio:"+widthRatio);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      			bmpFactoryOptions.inJustDecodeBounds = false;
     
    
   

    

     

    
    

     
			try
     
    
   

    

     

    
    

     

      			{
     
    
   

    

     

    
    

     

      				bitmap = BitmapFactory
     
    
   

    

     

    
    

     

      						.decodeStream(
     
    
   

    

     

    
    

     

      								getContentResolver().openInputStream(
     
    
   

    

     

    
    

     

      										imageFileUri), null, bmpFactoryOptions);
     
    
   

    

     

    
    

     

      			} catch (FileNotFoundException e)
     
    
   

    

     

    
    

     

      			{
     
    
   

    

     

    
    

     
				// TODO Auto-generated catch block
     
    
   

    

     

    
    

     

      				e.printStackTrace();
     
    
   

    

     

    
    

     

      			}
     
    
   

    

     

    
    

     

      			alteredBitmap = Bitmap.createBitmap(bitmap.getWidth(),
     
    
   

    

     

    
    

     

      					bitmap.getHeight(), bitmap.getConfig());
     
    
   

    

     

    
    

     

      			Log.e(TAG, "bitmap.Height:" + bitmap.getHeight());
     
    
   

    

     

    
    

     

      			canvas = new Canvas(alteredBitmap);
     
    
   

    

     

    
    

     

      			paint = new Paint();
     
    
   

    

     

    
    

     

      			paint.setColor(Color.GREEN);
     
    
   

    

     

    
    

     

      			paint.setStrokeWidth(5);
     
    
   

    

     

    
    

     

      			matrix = new Matrix();
     
    
   

    

     

    
    

     

      			canvas.drawBitmap(bitmap, matrix, paint);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      			imageView.setImageBitmap(alteredBitmap);
     
    
   

    

     

    
    

     
			// top=imageView.getTop(); //144.0
     
    
   

    

     

    
    

     
			// bottom=imageView.getBottom();//144.0
     
    
   

    

     

    
    

     
			// height=imageView.getHeight(); //0.0
     
    
   

    

     

    
    

     
			// Log.e(TAG, "bottom:"+bottom);
     
    
   

    

     

    
    

     

      			imageView.setOnTouchListener(this);
     
    
   

    

     

    
    

     

      		}
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
  
 

文章来源: panda1234lee.blog.csdn.net，作者：panda1234lee，版权归原作者所有，如需转载，请联系作者。

原文链接：panda1234lee.blog.csdn.net/article/details/8727275