14

我有一个Service我试图绑定到我的 main Activity，但我收到一个

java.lang.ClassCastException: android.os.BinderProxy 不能转换为 com.walintukai.rubix.ConnectionService$LocalBinder。

我已经在我的清单中声明了这项服务。为什么会这样？

清单声明

<service android:name=".ConnectionService" />

服务（简化代码）

public class ConnectionService extends Service {

static final String TAG = ConnectionService.class.getName();

private BluetoothAdapter mBtAdapter = null;
public BluetoothGatt mBluetoothGatt = null;
private ConnectionServiceEventListener mIRedBearServiceEventListener;
HashMap<String, BluetoothDevice> mDevices = null;
private BluetoothGattCharacteristic txCharc = null;
private final IBinder mBinder = new LocalBinder();

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

public class LocalBinder extends Binder {
    public ConnectionService getService() {
        return ConnectionService.this;
    }
}

@Override
public void onCreate() {
    super.onCreate();

    final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
    mBtAdapter = bluetoothManager.getAdapter();

    if (mBtAdapter == null) 
        return;

    if (mDevices == null) 
        mDevices = new HashMap<String, BluetoothDevice>();
}

@Override
public void onDestroy() {
    if (mBluetoothGatt == null)
        return;

    mBluetoothGatt.close();
    mBluetoothGatt = null;

    super.onDestroy();
}

}

主要活动

public class MainActivity extends ActionBarActivity {

private ConnectionService service;

ServiceConnection connection = new ServiceConnection() {

    @Override
    public void onServiceDisconnected(ComponentName name) {
        Log.i("ConnectionService", "Disconnected");
        service = null;
    }

    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        LocalBinder binder = (LocalBinder) service;
        service = (IBinder) binder.getService();

        if (service != null) {
            Log.i("RedBearService", "Connected");

        }
    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction().add(R.id.container, ViewPagerFragment.newInstance()).commit();
    }
}

@Override
public void onStart() {
    super.onStart();
    startService();
}

@Override
public void onStop() {
    super.onStop();
    stopService();
}

private void startService() {
    Intent service = new Intent(this, ConnectionService.class);
    bindService(service, connection, Context.BIND_AUTO_CREATE);
}

private void stopService() {
    unbindService(connection);
}

}

堆栈跟踪

07-30 17:19:39.065: E/AndroidRuntime(20891): java.lang.ClassCastException: android.os.BinderProxy cannot be cast to com.walintukai.rubix.ConnectionService$LocalBinder
07-30 17:19:39.065: E/AndroidRuntime(20891):    at com.walintukai.rubix.MainActivity$1.onServiceConnected(MainActivity.java:58)
07-30 17:19:39.065: E/AndroidRuntime(20891):    at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1110)
07-30 17:19:39.065: E/AndroidRuntime(20891):    at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1127)
07-30 17:19:39.065: E/AndroidRuntime(20891):    at android.os.Handler.handleCallback(Handler.java:733)
07-30 17:19:39.065: E/AndroidRuntime(20891):    at android.os.Handler.dispatchMessage(Handler.java:95)
07-30 17:19:39.065: E/AndroidRuntime(20891):    at android.os.Looper.loop(Looper.java:136)
07-30 17:19:39.065: E/AndroidRuntime(20891):    at android.app.ActivityThread.main(ActivityThread.java:5050)
07-30 17:19:39.065: E/AndroidRuntime(20891):    at java.lang.reflect.Method.invokeNative(Native Method)
07-30 17:19:39.065: E/AndroidRuntime(20891):    at java.lang.reflect.Method.invoke(Method.java:515)
07-30 17:19:39.065: E/AndroidRuntime(20891):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
07-30 17:19:39.065: E/AndroidRuntime(20891):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
07-30 17:19:39.065: E/AndroidRuntime(20891):    at dalvik.system.NativeStart.main(Native Method)
4

3 回答 3

13

你已经把它翻转了：

public void onServiceConnected(ComponentName name, IBinder service) {
    LocalBinder binder = (LocalBinder) service;
    service = (IBinder) binder.getService();
    ...
}

应该：

public void onServiceConnected(ComponentName name, IBinder service) {
    LocalBinder binder = (LocalBinder) service;
    MainActivity.this.service = (ConnectionService) binder.getService();
    ...
}
于 2014-07-31T01:02:26.920 回答
12

这个问题已有几年历史了，接受的答案对我不起作用。自从提出并回答了问题以来，Android 环境中可能发生了一些变化。

但我偶然发现了一个有效的简单解决方案。我看到另一个关于 SO 的问题试图启动 2 个服务并且他们有一个类似的错误（Getting java.lang.ClassCastException: android.os.BinderProxy 每次我声明并运行两个服务）。答案之一（@Coeffect）提到这两个服务不一定在同一个进程中运行。

我开始认为有可能（可能？）在我的情况下，活动和服务在不同的进程中运行。所以我将android:process元素添加到我的活动和服务器中，并修复了它。

这是一个示例AndroidManifest.xml。请注意，<activity>和<service>标签都包括android:process=":location"：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="net.byteslinger.locationservice">

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <application
        android:process=":location"
        android:allowBackup="true"
        android:icon="@mipmap/icon"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/icon"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity"
            android:process=":location"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service
            android:process=":location"
            android:name=".LocationService"
            android:enabled="true" />
    </application>

</manifest>
于 2018-02-04T19:08:18.320 回答
-1

我也遇到了这个问题。我的情况是这样的。

我的活动和服务不在同一个过程中。

<activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
<service android:name=".MyService"
       android:process=":remoute"/>

我想将服务与活动绑定。然后我遇到了同样的问题。我用这个方法解决了。

@Override
public IBinder onBind(Intent arg0) {
    int numb = arg0.getIntExtra("numb", 0);
    Log.e("WillWolf", "numb-->" + numb);
    if(numb == 1) {
        Log.e("WillWolf", "local binder");
        return new LocalBinder();
    } else {
        Log.e("WillWolf", "remote binder");
        return remoteBinder;
    }
}

请注意这一点。当你多次调用bindService()方法时，onBind()默认只回调一次。如果你想让onBind()执行多次，你应该这样做。

Intent intent = new Intent(context, MyService.class);
    intent.setType("remote");// should be different
    context.bindService(intent, coon, Context.BIND_AUTO_CREATE);

我希望它可以帮助你。

于 2019-07-17T10:28:46.057 回答