转换android.os.IBinder偶尔会导致ClassCastException

Question

在尝试将ClassCastException转换为本地服务Binder时，我遇到了一个奇怪的IBinder异常。偶尔会发生这种情况，我个人无法重现它（只有Crashlytics才知道它）。堆栈跟踪如下：

Fatal Exception: java.lang.ClassCastException: android.os.BinderProxy cannot be cast to gr.sport24.radio.MediaPlayerService$MediaPlayerBinder
       at gr.sport24.radio.RadioManager$RadioServiceConnection.onServiceConnected(RadioManager.java:740)
       at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1203)
       at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1220)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:135)
       at android.app.ActivityThread.main(ActivityThread.java:5536)
       at java.lang.reflect.Method.invoke(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:372)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1397)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1192)

这是启动连接的代码：

mApplicationContext.bindService(
    new Intent(mApplicationContext, MediaPlayerService.class), 
    new RadioServiceConnection(), 
    Context.BIND_AUTO_CREATE
);

这是RadioServiceConnection内部类：

private class RadioServiceConnection implements ServiceConnection
{
    @Override
    public void onServiceConnected(ComponentName className, IBinder serviceBinder) {
        synchronized (RADIO_LOCK) {
            // This is the line where ClassCastException sometimes occurs
            MediaPlayerService.MediaPlayerBinder binder =
                (MediaPlayerService.MediaPlayerBinder) serviceBinder;
            mRadioService = binder.getService();
            mRadioService.setClient(RadioManager.this);
        }

        mIsConnectingToRadioService.set(false);
        mIsBoundToRadioService = true;

        if (mAutoStartOnBind) startRadioPlayer();
    }

    @Override
    public void onServiceDisconnected(ComponentName arg0) {
        mIsConnectingToRadioService.set(false);
        mIsBoundToRadioService = false;

        stopRadioPlayer();
    }
}

这是MediaPlayerService类（超薄版）：

public class MediaPlayerService extends Service
{
    private final Binder mBinder;
    ...

    public MediaPlayerService() {
        mBinder = new MediaPlayerBinder();
        ...
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return mBinder;
    }

    ...

    public class MediaPlayerBinder extends Binder
    {
        public MediaPlayerService getService() {
            return MediaPlayerService.this;
        }
    }
}

这是接收本地通知按钮事件的BroadcastReceiver（创建本地通知以播放/暂停无线电）：

private class LocalRadioNotificationEventBroadcastReceiver extends BroadcastReceiver
{
    @Override
    public void onReceive (Context context, Intent intent) {
        if (Static.debug) Log.d(TAG, "Received local radio notification event.");
        if (intent == null) return;

        String action = (intent.getAction() != null) ? intent.getAction() : "";
        if (RadioNotificationEventsReceiver.ACTION_PLAY_PAUSE.equals(action)) {
            onRadioNotificationAction(ACTION_PLAY_PAUSE);
        } else if (RadioNotificationEventsReceiver.ACTION_CLOSE.equals(action)) {
            onRadioNotificationAction(ACTION_CLOSE);
        } else {
            if (Static.debug) {
                Log.w(TAG, "Unknown radio notification action [" + action + "].");
            }
        }
    }
}

注意：onRadioNotificationAction()没有做任何花哨的事情，只是检查执行了哪些操作并采取相应措施。如果由于某种原因丢失了与服务的连接，将从此方法间接调用bindService()。

这是清单文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:installLocation="auto">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <permission
        android:name="gr.sport24.permission.C2D_MESSAGE"
        android:protectionLevel="signature" />

    <uses-permission android:name="gr.sport24.permission.C2D_MESSAGE" />

    <application
        android:name=".Application"
        android:allowBackup="true"
        android:hardwareAccelerated="true"
        android:icon="@drawable/sport24"
        android:label="@string/app_name"
        android:theme="@style/Theme.Sport24"
        tools:replace="android:icon">

        <meta-data
            android:name="com.google.android.gms.analytics.globalConfigResource"
            android:resource="@xml/global_tracker" />

        <activity android:name=".activities.MainActivity"
            android:launchMode="singleTop" />
        <activity android:name=".activities.SplashActivity"
            android:theme="@style/Theme.sport24.NoActionBar">

            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".activities.LiveViewerActivity"
            android:launchMode="singleTask">

            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".activities.MainActivity" />
        </activity>
        <activity android:name=".activities.WebViewerPlainActivity">
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".activities.MainActivity" />
        </activity>
        <activity android:name=".activities.WebViewURLActivity"
            android:launchMode="singleTask">

            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".activities.MainActivity" />
        </activity>
        <activity android:name=".activities.WebViewerActivity"
            android:launchMode="singleTask">

            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".activities.MainActivity" />
        </activity>
        <activity android:name=".activities.LoadingPlayerActivity"
            android:theme="@style/Theme.sport24.Transparent.NoActionBar" >
        </activity>
        <activity android:name=".activities.TeamSelectorActivity" />
        <activity android:name=".activities.PreferenceActivity"
            android:windowSoftInputMode="stateAlwaysHidden" >

            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".activities.MainActivity" />
        </activity>
        <activity android:name=".activities.AboutActivity"
            android:windowSoftInputMode="stateAlwaysHidden">

            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".activities.PreferenceActivity" />
        </activity>
        <activity android:name=".activities.GalleryActivity"
            android:theme="@style/Theme.sport24.TranslusentActionBar"
            android:windowSoftInputMode="stateAlwaysHidden">

            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".activities.MainActivity" />
        </activity>
        <activity android:name=".activities.RadioActivity">
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".activities.MainActivity" />
        </activity>

        <service android:name="gr.sport24.radio.MediaPlayerService" />

        <!-- Receiver used for listening to radio notification actions. -->
        <receiver android:name="gr.sport24.radio.RadioNotificationEventsReceiver">
            <intent-filter>
                <action android:name="gr.sport24.radio.intent.action.ACTION_PLAY_PAUSE" />
                <action android:name="gr.sport24.radio.intent.action.ACTION_CLOSE" />
            </intent-filter>
        </receiver>

        <service android:name="com.pushmyapps.push.GcmMessageListenerService"
            android:exported="false">

            <intent-filter>
                <action android:name="com.google.android.c2dm.intent.RECEIVE" />
            </intent-filter>
        </service>
        <service android:name="com.pushmyapps.push.GcmTokenRefreshListenerService"
            android:exported="false">

            <intent-filter>
                <action android:name="com.google.android.gms.iid.InstanceID"/>
            </intent-filter>

        </service>
        <service android:name="com.pushmyapps.location.GeofencesIntentService" />
        <service android:name="com.pushmyapps.sync.SyncService"
            android:permission="com.google.android.gms.permission.BIND_NETWORK_TASK_SERVICE"
            android:exported="true">

            <intent-filter>
                <action android:name="com.google.android.gms.gcm.ACTION_TASK_READY" />
            </intent-filter>
        </service>

        <receiver
            android:name="com.google.android.gms.gcm.GcmReceiver"
            android:exported="true"
            android:permission="com.google.android.c2dm.permission.SEND">
            <intent-filter>
                <action android:name="com.google.android.c2dm.intent.RECEIVE" />
                <action android:name="com.google.android.c2dm.intent.REGISTRATION" />

                <category android:name="gr.sport24" />
            </intent-filter>
        </receiver>
        <receiver
            android:name="gr.sport24.PushManager$CustomPushBroadcastReceiver"
            android:exported="false">
            <intent-filter>
                <action android:name="com.pushmyapps.push.intent.RECEIVE" />
                <action android:name="com.pushmyapps.push.intent.OPEN" />
                <action android:name="com.pushmyapps.push.intent.CLOSE" />
            </intent-filter>
        </receiver>
        <receiver
            android:name="com.pushmyapps.BootUpBroadcastReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>

    </application>

</manifest>

通常，当使用android:process属性声明服务时会发生此崩溃，这表示服务将在单独的进程中启动，但显然不是我的情况。

onServiceConnected()是否有可能收到“错误的”IBinder？我在文档中没有找到任何证据。

有谁知道如何解决这个问题？欢迎任何建议！