Question

我正在尝试绑定到服务，但绑定服务方法总是返回false。我相信问题在于我的联系。当我导入LocalBinder类的位置（在服务中）时，我没有得到任何编译错误，但bindService调用仍然是false。

服务信息：

//binder for client
private final IBinder mBinder = new LocalBinder();

//client class binder
public class LocalBinder extends Binder {
    ServiceA getService() {
        // Return this instance of LocalService so clients can call public methods
        return ServiceA.this;
        }
}

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

//called when service is created
public void onCreate(){
    super.onCreate();
    Toast.makeText(this,"ServiceA is started",Toast.LENGTH_SHORT).show();
}

连接：

 private ServiceConnection connect2A = new ServiceConnection() {

    @Override
    public void onServiceConnected(ComponentName className,
            IBinder service) {
        // We've bound to LocalService, cast the IBinder and get LocalService instance
        LocalBinder newBinder = (LocalBinder) service;
        mainService = newBinder.getService();
        bound = true;
    }

    @Override
    public void onServiceDisconnected(ComponentName arg0) {
        bound = false;
    }
};

初次通话：

    @Override
protected void onStart(){
    super.onStart();
    Intent intent = new Intent(this, ServiceA.class);
    startService(intent);
    boolean check = bindService(intent,connect2A,0);
    Toast.makeText(this, "Return from check is: " + check, Toast.LENGTH_LONG).show();
    //program does get to this point, but binding fails
}

AndroidManifest.XML文件：

<application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name=".ServiceTest2Activity"
              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:enabled="true" android:name=".serviceA" />
</application>

Answer 1

一些想法：

- onStart（）方法是什么类的？我在onCreate（）中绑定了我的服务。

- 您是否需要将Context.BIND_AUTO_CREATE传递给bindService调用？ e.g。

boolean check = bindService(intent, connect2A, Context.BIND_AUTO_CREATE);

- 正如其他评论者建议的那样，您应该从AndroidManifest.xml发布相关的片段。

- 你应该在onServiceConnected方法中添加一些跟踪/吐司，以便你知道它是否被调用。

绑定到服务始终返回false

1 个答案: