I want to crop a picture in current window,maybe circle or rectangle. Here are my code.I first get the whole picture in current window.Then to crop circle or rectangle.
private Bitmap getBitmap()
{
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
View v1 = getWindow().getDecorView().getRootView();
v1.setDrawingCacheEnabled(true);
Bitmap mBackgroundBitmap = Bitmap.createBitmap(v1.getDrawingCache());
v1.setDrawingCacheEnabled(false);
mRect = ChooseView.cropRect; // the mRect is the crop area
int width = mRect.width();
int height = mRect.height();
Bitmap whiteBgBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(whiteBgBitmap);
Rect dstRect = new Rect(0, 0, width, height);
if(!TextUtils.isEmpty(CutParam.shape) && CutParam.shape.equals(CutParam.RECTANGLE))
{
canvas.drawColor(Color.WHITE);
canvas.drawBitmap(mBackgroundBitmap, mRect, dstRect, null);
}
else
{
final Paint paint = new Paint();
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
canvas.drawCircle(mRect.left + mRect.width() / 2, mRect.top + mRect.height() / 2, CutParam.radius, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(mBackgroundBitmap, mRect, dstRect, null);
}
return whiteBgBitmap;
}
The rectangle work will.But when I want to crop a circle,it will be a black image. I am fresh at Android.And I have read Cropping circular area from bitmap in Android .But I can't solve my question.Can you help me? PS:If crop a circle ,the mRect will be a square.
