Android空服务,Android服务始终为空

我试图启动一项服务，但始终获得NPE。我可能做错了什么？ 即使onServiceConnected()方法不会被调用，为什么？Android服务始终为空

@Override

protected void onCreate(Bundle savedInstanceState) {

mServiceIntent = new Intent(this, MyService.class);

bindService(mServiceIntent, mConnection, Context.BIND_AUTO_CREATE);

//other stuff

}

用法：

private okButton(View v) {

startService(mServiceIntent);

}

结果：NullPointerException异常！

private ServiceConnection mConnection = new ServiceConnection() {

@Override

public void onServiceConnected(ComponentName className, IBinder service) {

Log.v("service", "gets never executed!");

mDownloadService = ((LocalBinder) service).getService();

}

@Override

public void onServiceDisconnected(ComponentName className) {

}

};

}

public class LocalBinder extends Binder {

private String TAG = "LocalBinder";

private WeakReference mService;

public LocalBinder(S service){

mService = new WeakReference(service);

}

public S getService() {

return mService.get();

}

}

当然我也有在清单中的服务：

的logcat：

06-06 23:48:20.411: W/dalvikvm(592): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)

06-06 23:48:20.461: E/AndroidRuntime(592): FATAL EXCEPTION: main

06-06 23:48:20.461: E/AndroidRuntime(592): java.lang.RuntimeException: Unable to start activity ComponentInfo{MyActivity}: java.lang.NullPointerException

06-06 23:48:20.461: E/AndroidRuntime(592): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)

06-06 23:48:20.461: E/AndroidRuntime(592): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)

06-06 23:48:20.461: E/AndroidRuntime(592): at android.app.ActivityThread.access$600(ActivityThread.java:123)

06-06 23:48:20.461: E/AndroidRuntime(592): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)

06-06 23:48:20.461: E/AndroidRuntime(592): at android.os.Handler.dispatchMessage(Handler.java:99)

06-06 23:48:20.461: E/AndroidRuntime(592): at android.os.Looper.loop(Looper.java:137)

06-06 23:48:20.461: E/AndroidRuntime(592): at android.app.ActivityThread.main(ActivityThread.java:4424)

06-06 23:48:20.461: E/AndroidRuntime(592): at java.lang.reflect.Method.invokeNative(Native Method)

06-06 23:48:20.461: E/AndroidRuntime(592): at java.lang.reflect.Method.invoke(Method.java:511)

06-06 23:48:20.461: E/AndroidRuntime(592): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)

06-06 23:48:20.461: E/AndroidRuntime(592): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)

06-06 23:48:20.461: E/AndroidRuntime(592): at dalvik.system.NativeStart.main(Native Method)

06-06 23:48:20.461: E/AndroidRuntime(592): Caused by: java.lang.NullPointerException

06-06 23:48:20.461: E/AndroidRuntime(592): at MyActivity.okButton(MyActivity.java:217)

06-06 23:48:20.461: E/AndroidRuntime(592): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1939)

06-06 23:48:20.461: E/AndroidRuntime(592): ... 11 more

的意图似乎是确定：

Log.v("service", String.valueOf(mServiceIntent == null)); //false

+0

您不会给我们调用'startService(mServiceIntent);'的上下文，但如果这是给出'NullPointerException'的行号，那么在您调用它之前似乎没有初始化mServiceIntent。你从哪里来的？ –

+0

按下按钮后自定义的方法调用，例如：我的主要活动中的'okButton()'。以上所有代码都位于何处。所以没有什么特别的，所以我之前就把它排除在外了。 –

+1

发布显示NPE堆栈跟踪的logcat –