Android Bitmap透明背景

直接上源码：

private Bitmap bitmap;

private Canvas canvas;

bitmap = Bitmap.createBitmap(dmWidth, dmHeight, Bitmap.Config.ARGB_8888);

bitmap.setHasAlpha(true);

canvas = new Canvas(leadsBitmap);

canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);

if (canvas == null) {
logger.debug(TAG + "画布为空!"); return;}

canvas.drawPoints(mPoints, 0, mPointCount, paint);

activity.runOnUiThread(new Runnable() {
    @Override
    public void run() {
        mDrawObject.drawBitmap(mView);
    }
});

public void drawBitmap(ImageView view) {
    view.setBackgroundColor(Color.TRANSPARENT);
    view.setImageBitmap(bitmap);
}