private Bitmap getBitmap() {
        View view = findViewById(R.id.view);
        Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),
                Bitmap.Config.ARGB_8888);
        //利用bitmap生成畫布
        Canvas canvas = new Canvas(bitmap);
        //把view中的內容繪製在畫布上
        view.draw(canvas);
        return bitmap;
    }
 

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