如何用代码在Android中不仅应用程序拍摄屏幕快照

Question

我开发了截图的应用程序。但它只拍摄应用程序的快照。我想从应用程序中取出快照。我已经研究了答案，但还没有找到答案。这是我的代码。

View view = getWindow().getDecorView().getRootView();
view.setDrawingCacheEnabled(true);
Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
view.setDrawingCacheEnabled(false);
saveImageToAppFolder(bitmap);

saveImagetoAppFolder是将图像保存到应用程序文件夹的函数。那不是问题。有没有什么可以拍屏幕快照的？

Answer 1

要拍摄设备屏幕的屏幕快照，只有当根用户调用屏幕快照二进制文件时，才可以：

Process sh = Runtime.getRuntime().exec("su", null,null);
OutputStream  os = sh.getOutputStream();
os.write(("/system/bin/screencap -p " + Environment.getExternalStorageDirectory()+ "/img.png").getBytes("ASCII"));
os.flush();
os.close();
sh.waitFor()

若要将该文件加载到位图中，请使用

public static Bitmap decodeSampledBitmapFromFile(String path,
                                                     int reqWidth, int reqHeight) {

        // First decode with inJustDecodeBounds=true to check dimensions
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path, options);

        // Calculate inSampleSize
        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

        // Decode bitmap with inSampleSize set
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeFile(path, options);
    }

    public static int calculateInSampleSize(
            BitmapFactory.Options options, int reqWidth, int reqHeight) {
        // Raw height and width of image
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {

            final int halfHeight = height / 2;
            final int halfWidth = width / 2;

            // Calculate the largest inSampleSize value that is a power of 2 and keeps both
            // height and width larger than the requested height and width.
            while ((halfHeight / inSampleSize) > reqHeight
                    && (halfWidth / inSampleSize) > reqWidth) {
                inSampleSize *= 2;
            }
        }

        return inSampleSize;
    }