Android问题集锦之三十八
最后更新于：2022-04-01 06:39:24
## 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());
}
~~~