android mask,Android，自定义MaskImage

public class MaskableFrameLayout extends FrameLayout {

//Constants

private static final String TAG = "MaskableFrameLayout";

private static final int MODE_ADD = 0;

private static final int MODE_CLEAR = 1;

private static final int MODE_DARKEN = 2;

private static final int MODE_DST = 3;

private static final int MODE_DST_ATOP = 4;

private static final int MODE_DST_IN = 5;

private static final int MODE_DST_OUT = 6;

private static final int MODE_DST_OVER = 7;

private static final int MODE_LIGHTEN = 8;

private static final int MODE_MULTIPLY = 9;

private static final int MODE_OVERLAY = 10;

private static final int MODE_SCREEN = 11;

private static final int MODE_SRC = 12;

private static final int MODE_SRC_ATOP = 13;

private static final int MODE_SRC_IN = 14;

private static final int MODE_SRC_OUT = 15;

private static final int MODE_SRC_OVER = 16;

private static final int MODE_XOR = 17;

private Handler mHandler;

//Mask props

@Nullable

private Drawable mDrawableMask = null;

@Nullable

private Bitmap mFinalMask = null;

//Drawing props

private Paint mPaint = null;

private PorterDuffXfermode mPorterDuffXferMode = null;

public MaskableFrameLayout(Context context) {

super(context);

}

public MaskableFrameLayout(Context context, AttributeSet attrs) {

super(context, attrs);

construct(context, attrs);

}

public MaskableFrameLayout(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

construct(context, attrs);

}

private void construct(Context context, AttributeSet attrs) {

mHandler = new Handler();

setDrawingCacheEnabled(true);

setLayerType(LAYER_TYPE_SOFTWARE, null); //Only works for software layers

mPaint = createPaint(false);

Resources.Theme theme = context.getTheme();

if (theme != null) {