Android Read Only File System IOException

最近写了一个截图的功能，activity启动之后，截屏。方法如下：

public class ScreenDebug {    public static void screenshot(final View v, final Activity activity) {        new Thread(new Runnable() {            @Override            public void run() {                try {                    Thread.sleep(3000);                } catch (InterruptedException e) {                    e.printStackTrace();                }                  activity.runOnUiThread(new Runnable() {                    @Override                    public void run() {                                                View view = v.getRootView();                        view.setDrawingCacheEnabled(true);                        view.buildDrawingCache();                        Bitmap bitmap = view.getDrawingCache();                        Toast.makeText(activity, "test", Toast.LENGTH_SHORT).show();                        if (bitmap != null) {                            System.out.println("bitmap got!");                            try {                                FileOutputStream out = new FileOutputStream(fname);                                bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);                                                                Log.d("test", "test");                            } catch (Exception e) {                                e.printStackTrace();                            }                          }                     }                  });            }          }).start();    }

但是在运行之后，却报 "java.io.IOException: open failed: EROFS (Read-only file system)，最后在stackoverflow上找到答案，是因为现在有些手机不允许我们直接向sd card上写东西，因此做如下修改：

将String fname = "/sdcard/" + "screenshot.png";换成String fname = context.getFilesDir().getPath().toString() + "/screenshot.png";

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