android - java.lang.SecurityException : Permission Denial: not allowed to send broadcast android. intent.action.MEDIA_MOUNTED 仅在 KitKat 上

Question

我正在使用 DownloadManager 从我们的服务器下载图像，并将文件放在 externalFilesDir 中。

我正在发送广播 Intent ，因为我不希望这些下载的图像出现在图库中。

sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + context.getExternalFilesDir(null))));

我之前只在我的 Galaxy S3 Jelly Bean 4.3 上测试过它并且它可以工作，但是当我在 KitKat 4.4 上测试它时，它会导致应用程序崩溃。

有没有更好的方法使从 DownloadManager 下载的文件不会出现在手机图库中？

堆栈跟踪

06-05 17:34:41.940: E/AndroidRuntime(15410): FATAL EXCEPTION: main
06-05 17:34:41.940: E/AndroidRuntime(15410): Process: com.walintukai.lfdate, PID: 15410
06-05 17:34:41.940: E/AndroidRuntime(15410): java.lang.RuntimeException: Error receiving broadcast Intent { act=android.intent.action.DOWNLOAD_COMPLETE flg=0x10 pkg=com.walintukai.lfdate (has extras) } in com.walintukai.lfdate.SocketIOService$1@42359f40
06-05 17:34:41.940: E/AndroidRuntime(15410):    at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:778)
06-05 17:34:41.940: E/AndroidRuntime(15410):    at android.os.Handler.handleCallback(Handler.java:733)
06-05 17:34:41.940: E/AndroidRuntime(15410):    at android.os.Handler.dispatchMessage(Handler.java:95)
06-05 17:34:41.940: E/AndroidRuntime(15410):    at android.os.Looper.loop(Looper.java:136)
06-05 17:34:41.940: E/AndroidRuntime(15410):    at android.app.ActivityThread.main(ActivityThread.java:5057)
06-05 17:34:41.940: E/AndroidRuntime(15410):    at java.lang.reflect.Method.invokeNative(Native Method)
06-05 17:34:41.940: E/AndroidRuntime(15410):    at java.lang.reflect.Method.invoke(Method.java:515)
06-05 17:34:41.940: E/AndroidRuntime(15410):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
06-05 17:34:41.940: E/AndroidRuntime(15410):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
06-05 17:34:41.940: E/AndroidRuntime(15410):    at dalvik.system.NativeStart.main(Native Method)
06-05 17:34:41.940: E/AndroidRuntime(15410): Caused by: java.lang.SecurityException: Permission Denial: not allowed to send broadcast android.intent.action.MEDIA_MOUNTED from pid=15410, uid=10135
06-05 17:34:41.940: E/AndroidRuntime(15410):    at android.os.Parcel.readException(Parcel.java:1465)
06-05 17:34:41.940: E/AndroidRuntime(15410):    at android.os.Parcel.readException(Parcel.java:1419)
06-05 17:34:41.940: E/AndroidRuntime(15410):    at android.app.ActivityManagerProxy.broadcastIntent(ActivityManagerNative.java:2390)
06-05 17:34:41.940: E/AndroidRuntime(15410):    at android.app.ContextImpl.sendBroadcast(ContextImpl.java:1127)
06-05 17:34:41.940: E/AndroidRuntime(15410):    at android.content.ContextWrapper.sendBroadcast(ContextWrapper.java:365)
06-05 17:34:41.940: E/AndroidRuntime(15410):    at com.walintukai.lfdate.SocketIOService$1.onReceive(SocketIOService.java:111)
06-05 17:34:41.940: E/AndroidRuntime(15410):    at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:768)
06-05 17:34:41.940: E/AndroidRuntime(15410):    ... 9 more

Answer 1

Google 似乎正试图从 KITKAT 中阻止这种情况。
看core/rest/AndroidManifest.xml您会注意到广播 android.intent.action.MEDIA_MOUNTED 现在受到保护。这意味着它是一个只有系统才能发送的广播。

<protected-broadcast android:name="android.intent.action.MEDIA_MOUNTED" />

以下内容应该适用于所有版本:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
    final Intent scanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    final Uri contentUri = Uri.fromFile(outputFile); 
    scanIntent.setData(contentUri);
    sendBroadcast(scanIntent);
} else {
    final Intent intent = new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + Environment.getExternalStorageDirectory()));
    sendBroadcast(intent);
}

---

如果上述方法不起作用，请尝试以下操作:

据此post你需要另一种方法来解决它。
就像使用 MediaScannerConnection 或 ACTION_MEDIA_SCANNER_SCAN_FILE。

MediaScannerConnection.scanFile(this, new String[] {

file.getAbsolutePath()},

null, new MediaScannerConnection.OnScanCompletedListener() {

public void onScanCompleted(String path, Uri uri)

{


}

});