使用Martix来实现缩放图片的功能

使用Martix(android.graphics.Matrix)类中的postScale()方法结合Bitmap来实现缩放图片的功能

Bitmap bmp = BitmapFactory.decodeResource(getResource(),R.drawalbe.icon1)

int bmpwidth = bmp.getWidth();

int bmpheight = bmp.getHeight();

Matrix matrix = new Matrix();

matrix.postScale(width,height);

Bitmap bm = Bitmap.createBitmap(bmp,0,0,bmpwidth,bmpheight ,matrix,true);

imageView.setImageBitmap(bm);











iv = (ImageView) findViewById(R.id.iv);

        iv.setImageResource(R.drawable.icon);



onTouchEvent():

Matrix mtrx = iv.getImageMatrix(); 

      mtrx.postScale(2, 2); 

      iv.setImageMatrix(mtrx); 

      iv.setScaleType(ScaleType.MATRIX); 

      iv.invalidate();