public class GradientLayout  extends View {

    private Paint mPaint;
    private Shader mShader;
    private Bitmap mBitmap;

    public GradientLayout(Context context) {
        this(context, null);
    }

    public GradientLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public GradientLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {

        mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.beauty);

        mPaint = new Paint(); //初始化
//        mPaint.setColor(Color.RED);// 设置颜色
//        mPaint.setARGB(255, 255, 255, 0); // 设置 Paint对象颜色,范围为0~255
//        mPaint.setAlpha(200); // 设置alpha不透明度,范围为0~255
        mPaint.setAntiAlias(true); // 抗锯齿
        mPaint.setStyle(Paint.Style.FILL); //描边效果
//        mPaint.setStrokeWidth(4);//描边宽度
//        mPaint.setStrokeCap(Paint.Cap.ROU