The implementation of graphics and animation in Android

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public class MyView extends View{     Bitmap myBitmap;     Paint paint;     public MyView(Context context, AttributeSet attrs) {         super(context, attrs);         this.initBitmap();     }     public void initBitmap(){         paint = new Paint();         myBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.img);             }     @Override     protected void onDraw(Canvas canvas) {         super.onDraw(canvas);         paint.setAntiAlias(true);         paint.setColor(Color.WHITE);         paint.setTextSize(15);         canvas.drawBitmap(myBitmap, 10,  10, paint);                 //Saves the current matrix and clip onto a private stack.         //Subsequent calls to translate,scale,rotate,skew,concat or clipRect,clipPath         //will all operate as usual, but when the balancing call to restore() is made,         //those calls will be forgotten, and the settings that existed before the save() will be reinstated(恢复).         //Returns:         //The value to pass to restoreToCount() to balance this save()         int i = canvas.save();          System.out.println("current count -- > " + i);                 Matrix m1 = new Matrix();         m1.setTranslate(500, 10);         Matrix m2 = new Matrix();         m2.setRotate(15);         Matrix m3 = new Matrix();         m3.setConcat(m1, m2);         m1.setScale(0.8f, 0.8f);         m2.setConcat(m3, m1);         canvas.drawBitmap(myBitmap, m2, paint);                 //This call balances a previous call to save(), and is used to         //remove all modifications to the matrix/clip state since the last save call.         //It is an error to call restore() more times than save() was called.         canvas.restore();         int j = canvas.save();         System.out.println("current count -- > " + j);         paint.setAlpha(180);         m1.setTranslate(200, 100);         m2.setScale(1.3f, 1.3f);         m2.setConcat(m1, m2);         canvas.drawBitmap(myBitmap, m3, paint);                 //Restores the paint to its default settings.         paint.reset();         canvas.restore();         paint.setTextSize(40);         paint.setColor(Color.BLUE);         canvas.drawText("图片的宽度:" + myBitmap.getWidth(), 150, 220, paint);         canvas.drawText("图片的高度:" + myBitmap.getHeight(), 150, 300, paint);         paint.reset();             }}

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