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);}