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/**
 * Created by Jay on 2015/10/23 0023.
 */
public class ScreenUtil {
    /**
     * Get the screen width and height, not recommended after SDK17
     *
     * @param context
     */
    public static int[] getScreenHW(Context context) {
        WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        Display display = manager.getDefaultDisplay();
        int width = display.getWidth();
        int height = display.getHeight();
        int[] HW = new int[] { width, height };
        return HW;
    }

    /**
     * Get the screen width and height, recommended
     *
     * @param context
     */
    public static int[] getScreenHW2(Context context) {
        WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics dm = new DisplayMetrics();
        manager.getDefaultDisplay().getMetrics(dm);
        int width = dm.widthPixels;
        int height = dm.heightPixels;
        int[] HW = new int[] { width, height };
        return HW;
    }

    /**
     * Get the screen width
     *
     * @param context
     * @return
     */
    public static int getScreenW(Context context) {
        return getScreenHW2(context)[0];
    }

    /**
     * Get the screen height
     *
     * @param context
     * @return
     */
    public static int getScreenH(Context context) {
        return getScreenHW2(context)[1];
    }
}

private PorterDuffXfermode pdXfermode;   // Define PorterDuffXfermode variable
// Define MODE constants, you can directly change here to test
private static PorterDuff.Mode PD_MODE = PorterDuff.Mode.ADD;
private int screenW, screenH; // Screen width and height
private int width = 200;      // The width and height of the drawing picture
private int height = 200;
private Bitmap srcBitmap, dstBitmap;     // The Bitmap of the upper SRC and the lower Dst

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

public XfermodeView(Context context, AttributeSet attrs) {
    super(context, attrs);
    screenW = ScreenUtil.getScreenW(context);
    screenH