Android onServiceConnected（）处的nullpointer异常

编辑2： 我刚刚意识到我没有用新的AccessibilityServiceInfo初始化信息，我只是很愚蠢。

我正在尝试使用AccessibilityService从我的其他手机应用程序（youtube、facebook、sms）中侦听和检索通知信息

它崩溃，onServiceConnected上的logcat报告空指针异常

谷歌搜索后，我想这可能是因为该活动尚未绑定到该服务，因此无法启动它

我需要绑定辅助功能服务吗

如果是，我该怎么做

我的AccessibilityListener类中有这些代码

@Override
    public void onCreate() {
        super.onCreate();
        Intent intent = new Intent(BROADCAST_ACTION);
        Log.d("TAG","onCreate");
    }

    @Override
    public void onServiceConnected() {
        info.packageNames = new String[] {"com.whatsapp","com.facebook"};

        info.notificationTimeout = 100;

        this.setServiceInfo(info);
        Log.d("TAG","onServiceConnected");
    }

    @Override
    public void onAccessibilityEvent(AccessibilityEvent event) {
        final int eventType = event.getEventType();
        NotificationInfo info = new NotificationInfo();

        Toast.makeText(getApplicationContext(), "Received event", 1000);
        Log.d("TAG","onaccessibility event running");
        switch (eventType) {

            case AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED:
                info.packageName = (String) event.getPackageName();
                info.eventTime = event.getEventTime();
                info.eventText = event.getText().toString();
                sendEvent(info);


        }
    }

这些代码在我的活动中

@Override

    protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    //sets the main layout of the activity

    setContentView(R.layout.calendar_display);


    //initializes the calendarview

    initializeCalendar();

    intent = new Intent(this,AccessibilityListener.class);

}

@Override
protected void onStart() {
    super.onStart();
    // Bind to Your Service
   // Intent intent = new Intent(this, AccessibilityListener.class);

    LocalBroadcastManager.getInstance(this).registerReceiver(notificationReceiver, 
            new IntentFilter("add-event"));
    startService(intent);
}

@Override
protected void onResume() {
    super.onResume();

    if(isMyServiceRunning(AccessibilityListener.class))
        Toast.makeText(this,"Service is online", 1000).show();
    else
        Toast.makeText(this,"Service is offline", 1000).show();

    registerReceiver(notificationReceiver,new IntentFilter(AccessibilityListener.BROADCAST_ACTION));
}

编辑：根据要求，添加到logcat中

> 08-25 07:35:29.265: D/ActivityThread(24456): handleBindApplication:com.example.utarapp
08-25 07:35:29.265: D/ActivityThread(24456): setTargetHeapUtilization:0.75
08-25 07:35:29.265: D/ActivityThread(24456): setTargetHeapMinFree:2097152
08-25 07:35:29.630: D/TAG(24456): onCreate
08-25 07:35:29.715: D/libEGL(24456): loaded /system/lib/egl/libEGL_mali.so
08-25 07:35:29.725: D/libEGL(24456): loaded /system/lib/egl/libGLESv1_CM_mali.so
08-25 07:35:29.730: D/libEGL(24456): loaded /system/lib/egl/libGLESv2_mali.so
08-25 07:35:29.730: E/(24456): Device driver API match
08-25 07:35:29.730: E/(24456): Device driver API version: 23
08-25 07:35:29.730: E/(24456): User space API version: 23 
08-25 07:35:29.730: E/(24456): mali: REVISION=Linux-r3p2-01rel3 BUILD_DATE=Fri Mar 21 13:52:50 KST 2014 
08-25 07:35:29.830: D/OpenGLRenderer(24456): Enabling debug mode 0
08-25 07:35:30.150: D/AndroidRuntime(24456): Shutting down VM
08-25 07:35:30.150: W/dalvikvm(24456): threadid=1: thread exiting with uncaught exception (group=0x4185ace0)
08-25 07:35:30.155: E/AndroidRuntime(24456): FATAL EXCEPTION: main
08-25 07:35:30.155: E/AndroidRuntime(24456): Process: com.example.utarapp, PID: 24456
08-25 07:35:30.155: E/AndroidRuntime(24456): java.lang.NullPointerException
08-25 07:35:30.155: E/AndroidRuntime(24456):    at com.example.utarapp.AccessibilityListener.onServiceConnected(AccessibilityListener.java:36)
08-25 07:35:30.155: E/AndroidRuntime(24456):    at android.accessibilityservice.AccessibilityService$1.onServiceConnected(AccessibilityService.java:546)
08-25 07:35:30.155: E/AndroidRuntime(24456):    at android.accessibilityservice.AccessibilityService$IAccessibilityServiceClientWrapper.executeMessage(AccessibilityService.java:659)
08-25 07:35:30.155: E/AndroidRuntime(24456):    at com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:40)
08-25 07:35:30.155: E/AndroidRuntime(24456):    at android.os.Handler.dispatchMessage(Handler.java:102)
08-25 07:35:30.155: E/AndroidRuntime(24456):    at android.os.Looper.loop(Looper.java:136)
08-25 07:35:30.155: E/AndroidRuntime(24456):    at android.app.ActivityThread.main(ActivityThread.java:5146)
08-25 07:35:30.155: E/AndroidRuntime(24456):    at java.lang.reflect.Method.invokeNative(Native Method)
08-25 07:35:30.155: E/AndroidRuntime(24456):    at java.lang.reflect.Method.invoke(Method.java:515)
08-25 07:35:30.155: E/AndroidRuntime(24456):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)
08-25 07:35:30.155: E/AndroidRuntime(24456):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)
08-25 07:35:30.155: E/AndroidRuntime(24456):    at dalvik.system.NativeStart.main(Native Method)
08-25 07:35:32.080: I/Process(24456): Sending signal. PID: 24456 SIG: 9
08-25 07:35:33.165: D/ActivityThread(24700): handleBindApplication:com.example.utarapp
08-25 07:35:33.165: D/ActivityThread(24700): setTargetHeapUtilization:0.75
08-25 07:35:33.165: D/ActivityThread(24700): setTargetHeapMinFree:2097152
08-25 07:35:33.225: D/TAG(24700): onCreate
08-25 07:35:33.235: D/AndroidRuntime(24700): Shutting down VM
08-25 07:35:33.235: W/dalvikvm(24700): threadid=1: thread exiting with uncaught exception (group=0x4185ace0)
08-25 07:35:33.240: E/AndroidRuntime(24700): FATAL EXCEPTION: main
08-25 07:35:33.240: E/AndroidRuntime(24700): Process: com.example.utarapp, PID: 24700
08-25 07:35:33.240: E/AndroidRuntime(24700): java.lang.NullPointerException
08-25 07:35:33.240: E/AndroidRuntime(24700):    at com.example.utarapp.AccessibilityListener.onServiceConnected(AccessibilityListener.java:36)
08-25 07:35:33.240: E/AndroidRuntime(24700):    at android.accessibilityservice.AccessibilityService$1.onServiceConnected(AccessibilityService.java:546)
08-25 07:35:33.240: E/AndroidRuntime(24700):    at android.accessibilityservice.AccessibilityService$IAccessibilityServiceClientWrapper.executeMessage(AccessibilityService.java:659)
08-25 07:35:33.240: E/AndroidRuntime(24700):    at com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:40)
08-25 07:35:33.240: E/AndroidRuntime(24700):    at android.os.Handler.dispatchMessage(Handler.java:102)
08-25 07:35:33.240: E/AndroidRuntime(24700):    at android.os.Looper.loop(Looper.java:136)
08-25 07:35:33.240: E/AndroidRuntime(24700):    at android.app.ActivityThread.main(ActivityThread.java:5146)
08-25 07:35:33.240: E/AndroidRuntime(24700):    at java.lang.reflect.Method.invokeNative(Native Method)
08-25 07:35:33.240: E/AndroidRuntime(24700):    at java.lang.reflect.Method.invoke(Method.java:515)
08-25 07:35:33.240: E/AndroidRuntime(24700):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)
08-25 07:35:33.240: E/AndroidRuntime(24700):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)
08-25 07:35:33.240: E/AndroidRuntime(24700):    at 

    dalvik.system.NativeStart.main(Native Method)
    08-25 07:40:33.305: I/Process(24700): Sending signal. PID: 24700 SIG: 9

---

多亏了hitch.united的介绍，我意识到这是因为我没有参加比赛

可访问性服务信息

I info=new AccessibilityServiceInfo（）之后我工作

---

对不起，我弄错了。

感谢hitch.united的提醒，我意识到这是因为我没有初始化

可访问性服务信息

I info=new AccessibilityServiceInfo（）之后我工作

---

对不起，我弄错了。

你能给我们看看航海日志吗？另外，“信息”是否提供了NPE？其中哪一个是第36行？您能给我们看一下logcat吗？另外，“info”是否给出了NPE？其中哪一行是第36行？NullPointerException总是关于未初始化的空值。下次注意：）NullPointerException总是关于未初始化的Null。下次小心点：）