Android 截屏方法

try {
            Bitmap bitmap = Bitmap.createBitmap(v.getWidth(), v.getHeight(), Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas();
            canvas.setBitmap(bitmap);
            v.draw(canvas);

            try {
                FileOutputStream fos = new FileOutputStream(filePath);
                bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
            } catch (FileNotFoundException e) {
                throw new InvalidParameterException();
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

该方法是依托于view的截图方式

想要后台截屏，需要借助MediaProjectionManager的方式实现，即录屏。取出来第一帧