錯誤傳遞多個點

Question

我已經閱讀SO對此幾乎每一個崗位，並試圖所有的解決方案，我覺得他們是相對的，當接收廣播的意圖，但我仍然不知道爲什麼會這樣。這裏是logcat的：

02-20 18:10:27.959: D/ProximityIntentReceiver(17636): entering receiver 
02-20 18:10:27.959: W/dalvikvm(17636): threadid=1: thread exiting with uncaught exception (group=0x40adf9f0) 
02-20 18:10:27.959: E/AndroidRuntime(17636): FATAL EXCEPTION: main 
02-20 18:10:27.959: E/AndroidRuntime(17636): java.lang.RuntimeException: Error receiving broadcast Intent { act=com.javacodegeeks.android.lbs.ProximityAlert flg=0x10 (has extras) } in com.example.newmaps.ProximityIntentReceiver@41550140 
02-20 18:10:27.959: E/AndroidRuntime(17636): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:737) 
02-20 18:10:27.959: E/AndroidRuntime(17636): at android.os.Handler.handleCallback(Handler.java:605) 
02-20 18:10:27.959: E/AndroidRuntime(17636): at android.os.Handler.dispatchMessage(Handler.java:92) 
02-20 18:10:27.959: E/AndroidRuntime(17636): at android.os.Looper.loop(Looper.java:137) 
02-20 18:10:27.959: E/AndroidRuntime(17636): at android.app.ActivityThread.main(ActivityThread.java:4424) 
02-20 18:10:27.959: E/AndroidRuntime(17636): at java.lang.reflect.Method.invokeNative(Native Method) 
02-20 18:10:27.959: E/AndroidRuntime(17636): at java.lang.reflect.Method.invoke(Method.java:511) 
02-20 18:10:27.959: E/AndroidRuntime(17636): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:817) 
02-20 18:10:27.959: E/AndroidRuntime(17636): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584) 
02-20 18:10:27.959: E/AndroidRuntime(17636): at dalvik.system.NativeStart.main(Native Method) 
02-20 18:10:27.959: E/AndroidRuntime(17636): Caused by: java.lang.NullPointerException 
02-20 18:10:27.959: E/AndroidRuntime(17636): at android.app.PendingIntent.getActivity(PendingIntent.java:195) 
02-20 18:10:27.959: E/AndroidRuntime(17636): at com.example.newmaps.ProximityIntentReceiver.onReceive(ProximityIntentReceiver.java:36) 
02-20 18:10:27.959: E/AndroidRuntime(17636): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:728) 
02-20 18:10:27.959: E/AndroidRuntime(17636): ... 9 more 

這裏是我的地圖類中的代碼，我與位置監聽器一起打造一個接近警報：

private void addProximityAlert(Double latitude, Double longitude, String poiName) { 
    Bundle extras = new Bundle(); 
    extras.putString("name", poiName); 
    extras.putInt("id", requestCode); 
    Intent intent = new Intent(PROX_ALERT_INTENT); 
    intent.putExtra(PROX_ALERT_INTENT, extras); 
    PendingIntent proximityIntent = PendingIntent.getBroadcast(Map.this, requestCode , intent, PendingIntent.FLAG_CANCEL_CURRENT); 
    lm.addProximityAlert(
      latitude, // the latitude of the central point of the alert region 
      longitude, // the longitude of the central point of the alert region 
      POINT_RADIUS, // the radius of the central point of the alert region, in meters 
      PROX_ALERT_EXPIRATION, // time for this proximity alert, in milliseconds, or -1 to indicate no       expiration 
      proximityIntent // will be used to generate an Intent to fire when entry to or exit from the alert region is detected 
    ); 

    requestCode++;  
    IntentFilter filter = new IntentFilter(PROX_ALERT_INTENT); 
    registerReceiver(new ProximityIntentReceiver(), filter); 
    Toast.makeText(getApplicationContext(),"Alert Added"+requestCode,Toast.LENGTH_SHORT).show(); 
} 


    public class MyLocationListener implements LocationListener { 
    public void onLocationChanged(Location location) { 


     Toast.makeText(Map.this, "Distance from Point:", Toast.LENGTH_LONG).show(); 
    } 
    public void onStatusChanged(String s, int i, Bundle b) {    
    } 
    public void onProviderDisabled(String s) { 
    } 
    public void onProviderEnabled(String s) {   
    } 
    } 

這裏是接近類：

public class ProximityIntentReceiver extends BroadcastReceiver { 

private static final int NOTIFICATION_ID = 1000; 

@Override 
public void onReceive(Context context, Intent intent) { 

String key = LocationManager.KEY_PROXIMITY_ENTERING; 

Boolean entering = intent.getBooleanExtra(key, false); 

if (entering) { 
    Log.d(getClass().getSimpleName(), "entering receiver"); 
} 
else { 
    Log.d(getClass().getSimpleName(), "exiting"); 
} 

NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE); 

PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, null, 0);   

Notification notification = createNotification();   
notification.setLatestEventInfo(context, 
    "Proximity Alert!", "You are approaching: " +intent.getBundleExtra("deucalion0.ProximityAlert.").get("name"), pendingIntent);  
                    //here------------------------------------- 
notificationManager.notify(intent.getBundleExtra("deucalion0.ProximityAlert.").getInt("id"), notification); 

} 

private Notification createNotification() { 
Notification notification = new Notification(); 

notification.icon = R.drawable.ic_launcher; 
notification.when = System.currentTimeMillis(); 

notification.flags |= Notification.FLAG_AUTO_CANCEL; 
notification.flags |= Notification.FLAG_SHOW_LIGHTS;     

notification.defaults |= Notification.DEFAULT_VIBRATE; 
notification.defaults |= Notification.DEFAULT_LIGHTS; 
notification.defaults |= Notification.DEFAULT_SOUND; 

notification.ledARGB = Color.WHITE; 
notification.ledOnMS = 300; 
notification.ledOffMS = 1500; 

return notification; 
}} 

當我運行應用程序並打開地圖時，它很好，但最終崩潰時，手機剛剛坐在那裏，我不知道它在做什麼，也許這是與位置監聽器有關？我非常感謝幫助解決這個問題，因爲我在這一點上毫無頭緒。

Answer 1

從logcat的：

Caused by: java.lang.NullPointerException 
    at android.app.PendingIntent.getActivity(PendingIntent.java:195) 
    at com.example.newmaps.ProximityIntentReceiver.onReceive(ProximityIntentReceiver.java:36) 

的問題似乎是這條線，當你調用getActivity()：

PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, null, 0); 

這是令人困惑的。 PendingIntent的目的是啓動一個組件，在這個例子中是一個Activity，但是你傳遞一個null意圖。你想要這行代碼做什麼？

Answer 2

在ProximityIntentReceiver - 變線

PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, null, 0); 

到

PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);