Screenshot of the current activity and the opened dialog

The screenshot of the current activity and the open dialog are not found. The official screenshot method is not found. The current method is to read the cache of the view to be screenshot and draw it called a picture. To save the opened dialog, if you need a background, then draw the background to Together, it's all right.

    View mainView = getWindow().getDecorView();
    //也可以用下面的，效果等同于上面的效果
    //mainView= findViewById(android.R.id.content);
    mainView.setDrawingCacheEnabled(true);
    mainView.buildDrawingCache();
    //没找到可以截取状态栏的办法，如果有人知道，可以告知一下本人。上面获取到的bitmap是包含顶部状态栏的，所以需要去掉。
    int statusBarHeight = AppUtil.getStatusBarHeight(context);
    //virtualHight是底部虚拟按键的高度，如何获取，参见我的上一篇博客，这里不进行赘述了。
    Bitmap bitmap = Bitmap.createBitmap(mainView.getDrawingCache(),0,statusBarHeight, mainView.getWidth(),mainView.getHeight()－statusBarHeight-virtualHight);
    //如果需要同时保存打开的dialog的截图，可以这么做，如果不需要，上面的bitmap就是当前activity的截图了。
    View dialogView = dialog.getWindow().getDecorView();
    int location[] = new int[2];
    mainView.getLocationOnScreen(location);
    int location2[] = new int[2];
    dialogView.getLocationOnScreen(location2);
    dialogView.setDrawingCacheEnabled(true);
    dialogView.buildDrawingCache();
    Bitmap bitmap2 = Bitmap.createBitmap(dialogView.getDrawingCache(), 0, 0, dialogView.getWidth(), dialogView.getHeight());
    Canvas canvas = new Canvas(bitmap);
    canvas.drawBitmap(bitmap2, location2[0] - location[0], location2[1] - location[1], new Paint());
    mainView.destroyDrawingCache();
    dialogView.destroyDrawingCache();

Here is how to save bitmap

    public void saveBitmap(Bitmap bitmap,String fileName){
        File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
        File imageFile = new File(path, fileName+".png");
        FileOutputStream fileOutPutStream = null;
        try {
            fileOutPutStream = new FileOutputStream(imageFile);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        //第一个参数是图片的类型，有三种，第二个参数是保存的图片的质量。0～100
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, fileOutPutStream);
        try {
            fileOutPutStream.flush();
            fileOutPutStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        //这是保存好的图片的绝对地址
        //Uri uri = Uri.parse("file://" + imageFile.getAbsolutePath());
    }