## not allowed to send broadcast android.intent.action.MEDIA_MOUNTED 当我们保存图片后就会发个通知告诉系统让sdcard重新挂载，这样其他程序就会立即找到这张图片。 ~~~ Intent intent = new Intent(); intent.setAction(Intent.ACTION_MEDIA_MOUNTED); intent.setData(Uri.fromFile(Environment .getExternalStorageDirectory())); sendBroadcast(intent); ~~~ 但是到了Android4.4就不灵了，Google将MEDIA_MOUNTED的权限提高了，于是就报了一个下面的错误。 ~~~ W/System.err﹕java.lang.SecurityException: Permission Denial: not allowed to send broadcast android.intent.action.MEDIA_MOUNTED from pid=18338, uid=10087 ~~~ 在stackoverfollow中找到了一个办法，在高版本中使用ACTION_MEDIA_SCANNER_SCAN_FILE去通知系统重新扫描文件。代码如下： ~~~ if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { Intent mediaScanIntent = new Intent( Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); Uri contentUri = Uri.fromFile(mPhotoFile); //out is your output file mediaScanIntent.setData(contentUri); CameraActivity.this.sendBroadcast(mediaScanIntent); } else { sendBroadcast(new Intent( Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + Environment.getExternalStorageDirectory()))); } } catch (FileNotFoundException e) { Log.d(TAG, "File not found: " + e.getMessage()); } catch (IOException e) { Log.d(TAG, "Error accessing file: " + e.getMessage()); } ~~~