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私が呼んでいるアプリがありますsendBroadcast()。私のレシーバークラスは次のとおりです。

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.location.LocationManager;
import android.util.Log;

public class ProximityIntentReceiver extends BroadcastReceiver {

    private static final String TAG = ProximityIntentReceiver.class
            .getSimpleName();
    private static final int NOTIFICATION_ID = 1000;

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.e(TAG, "inside prox onreceive");
        String key = LocationManager.KEY_PROXIMITY_ENTERING;
        Boolean entering = intent.getBooleanExtra(key, false);
        if (entering) {
            Log.d(getClass().getSimpleName(), "entering");
        } 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 near your point of interest.", pendingIntent);
        notificationManager.notify(NOTIFICATION_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.ledARGB = Color.WHITE;
        notification.ledOnMS = 1500;
        notification.ledOffMS = 1500;
        return notification;
    }
}

私はNullPointerException次の行にあります。

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

呼び出し元のサービスは次のとおりです。

import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;

public class LocationService extends Service {

    private static final String TAG = LocationService.class.getSimpleName();
    LocationManager mlocManager;
    LocationListener mlocListener;
    NfcScannerApplication nfcscannerapplication;
    private static final String PROX_ALERT_INTENT = "com.carefreegroup.ProximityAlert";
    Intent intent;
    PendingIntent proximityIntent;
    ProximityIntentReceiver pir;

    @Override
    public void onCreate() {
        nfcscannerapplication = (NfcScannerApplication) getApplication();
        mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        mlocListener = new MyLocationListener();
        pir = new ProximityIntentReceiver();
        intent = new Intent(PROX_ALERT_INTENT);
        proximityIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
        Log.e(TAG, "Service created and location manager and listener created");
        super.onCreate();
    }

    @Override
    public void onDestroy() {
        mlocManager.removeUpdates(mlocListener);
        unregisterReceiver(pir);
        Log.e(TAG, "Service destroyed");
        super.onDestroy();
    }

    @Override
    public void onStart(Intent intent, int startId) {
        mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
                mlocListener);
        IntentFilter filter = new IntentFilter(PROX_ALERT_INTENT);
        registerReceiver(pir, filter);
        Log.e(TAG, "requesting location updates");
        super.onStart(intent, startId);
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;// TODO Auto-generated method stub
    }

    private class MyLocationListener implements LocationListener {

        @Override
        public void onLocationChanged(Location loc) {
            Log.e(TAG, "about to set geopoints in application object");
            nfcscannerapplication.setLat(loc.getLatitude());
            nfcscannerapplication.setLon(loc.getLongitude());
            fireLocationChangeEvent(loc.getLongitude(), loc.getLatitude());
            mlocManager.addProximityAlert(53.653480529785156,
                    -1.51961088180542, 2, -1, proximityIntent);
            sendBroadcast(intent);
        }

        @Override
        public void onProviderDisabled(String provider) {}

        @Override
        public void onProviderEnabled(String provider) {}

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {}
    }// end of MyLocationListener

    private void fireLocationChangeEvent(double lon, double lal) {
        LocalBroadcastManager.getInstance(getApplicationContext())
                .sendBroadcast(new LocationChangeIntent(lon, lal));
    }
}// end of service

。

なぜ私はNullPointerExceptionこのラインに乗るのですか？

4

1 に答える 1

2

インテントオブジェクトを作成してgetActivityメソッドにnullを配置していないため、NullPointerExceptionがスローされます。インテントアクションがBroadcastReceiverをトリガーしたときに、LocationServiceを呼び出したいと思います。その場合は、以下のようにサービスを呼び出すインテントを作成してから、インテントオブジェクトを保留中のインテントに配置する必要があります。

Intent i = new Intent(context,LocationService.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, i, 0);
于 2012-10-03T15:45:39.100 に答える