无法从服务生成的广播接收器获取数据？
无法从服务生成的广播接收器获取数据？
提问于 2019-06-10 00:32:19
我定义了一个名为LocationService的服务，它通过LocalBroadcastManager发送意图，如下所示：
Intent intent = new Intent(ACTION_LOCATION_BROADCAST);
intent.putExtra(EXTRA_LATITUDE, lat);
intent.putExtra(EXTRA_LONGITUDE, lng);
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);在我的MainActivity1中，我通过以下代码获得了纬度和经度，该代码运行良好
LocalBroadcastManager.getInstance(this).registerReceiver(
new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
mlattitude = Double.parseDouble(intent.getStringExtra(LocationService.EXTRA_LATITUDE));
mlongitude = Double.parseDouble(intent.getStringExtra(LocationService.EXTRA_LONGITUDE));
}
}, new IntentFilter(LocationService.ACTION_LOCATION_BROADCAS));现在，我已经在另一个活动(比如MainActivity2)中启动了这个服务，代码如下：
LocationService
public class LocationService extends Service implements LocationListener,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener{
private final IBinder mBinder = new LocalBinder();
public class LocalBinder extends Binder {
public LocationService getService() {
return LocationService.this;
}
}
@Override
public int onStartCommand(Intent intent, int flags, int startId){ ... }
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
@Override
public void onConnected(Bundle dataBundle) { ... }
@Override
public void onLocationChanged(Location location) {
sendMessageToUI(String.valueOf(location.getLatitude()), String.valueOf(location.getLongitude()));
}
}
private void sendMessageToUI(String lat, String lng) {
Log.d(TAG, "Sending info...");
Intent intent = new Intent(ACTION_LOCATION_BROADCAST);
intent.putExtra(EXTRA_LATITUDE, lat);
intent.putExtra(EXTRA_LONGITUDE, lng);
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
}MainActivity1
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LocalBroadcastManager.getInstance(this).registerReceiver(
new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Log.d(TAG, "onReceive: called");
mlattitude = Double.parseDouble(intent.getStringExtra(LocationService.EXTRA_LATITUDE));
mlongitude = Double.parseDouble(intent.getStringExtra(LocationService.EXTRA_LONGITUDE));
if (mlattitude != null && mlongitude != null) {
mLatlngTxtVu.setText("Latitude : " + mlattitude + "Longitude: " + mlongitude);
}
}
}, new IntentFilter(LocationService.ACTION_LOCATION_BROADCAS));MainActivity1工作正常，可以设置纬度和经度文本视图。
MainActivity2
public class MainActivity2 extends AppCompatActivity {
// Service related declaration
LocationService mLocationService;
boolean mBound = false;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity2_main);
Intent serviceIntent = new Intent(this, LocationService.class);
Log.d(TAG, "onCreate: intent started");
startService(serviceIntent);
LocalBroadcastManager.getInstance(this).registerReceiver(
new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Log.d(TAG, "onReceive: called");
mlattitude = Double.parseDouble(intent.getStringExtra(LocationService.EXTRA_LATITUDE)); // Getting NullPointer Error here
mlongitude = Double.parseDouble(intent.getStringExtra(LocationService.EXTRA_LONGITUDE));
Log.d("latlng", "onReceive: " + mlongitude + mlattitude);
if (mlattitude != null && mlongitude != null) {
mLatlngTextVu.setText("Latitude : " + mlattitude + "Longitude: " + mlongitude);
}
}
}, new IntentFilter(LocationService.ACTION_LOCATION_BROADCAST));
}我在MainActivity2的onRecieve()方法中的mlatitude处得到空指针异常。
请帮帮忙，告诉我我哪里做错了。
回答 1
Stack Overflow用户
发布于 2019-06-10 13:16:02
在清理项目和InvalidateCache/Restart之后，我终于解决了这个问题。感到尴尬:)
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56516392
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