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();

	}

}