ブロードキャストレシーバーのGPSロケーションを取得するか、ブロードキャストレシーバーデータ転送のためのサービスを取得します

Question

Androidは初めてです。
放送受信機でGPSロケーションを取得したいのですが、エラーが表示されます。

私のコードは：

public void onReceive(Context context, Intent intent) {
    LocationManager locManager = (LocationManager) 
            getSystemService(Context.LOCATION_SERVICE);
    // errors in getSystemService method
    LocationListener locListener = new MyLocationListener();
    locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
            locListener);
    Location loc = locManager
            .getLastKnownLocation(LocationManager.GPS_PROVIDER);
    Log.d(" **location**", " location" + loc.getLatitude());
}

質問：

1. 放送受信機でGPS位置データを取得することは可能ですか？
2. これまでに試みた別の方法は、ブロードキャストレシーバーによって呼び出されるサービスを使用することでした。サービスはGPSデータを取得できますが、ブロードキャストレシーバーで取得するにはどうすればよいですか？

Answer 1

BroadcastReceiverから、Location Managerも起動できませんでした。そのため、BroadcastReceiverでサービスを開始し、そのサービスでLocation Managerを操作しました。この解決策はAndroid開発ドキュメントにあります。サービスの代わりにアクティビティを開始することもできます。

BroadcastReceiverでサービスに切り替えるコードは次のとおりです。

これをonReceiveメソッドに書き込む

    Intent serviceIntent = new Intent(context,MyService.class);
    serviceIntent.putExtra("locateRequest", "locateRequest"); // if you want pass parameter from here to service
    serviceIntent.putExtra("queryDeviceNumber", results[1]);
    context.startService(serviceIntent); //start service for get location

Answer 2

はい、どちらも可能です。

一定の時間内に位置レシーバーにリクエストを送信するタイマー付きのサービス：

public class SrvPositioning extends Service {

    // An alarm for rising in special times to fire the
    // pendingIntentPositioning
    private AlarmManager alarmManagerPositioning;
    // A PendingIntent for calling a receiver in special times
    public PendingIntent pendingIntentPositioning;

    @Override
    public void onCreate() {
        super.onCreate();
        alarmManagerPositioning = (AlarmManager) 
                getSystemService(Context.ALARM_SERVICE);
        Intent intentToFire = new Intent(
                ReceiverPositioningAlarm.ACTION_REFRESH_SCHEDULE_ALARM);
        intentToFire.putExtra(ReceiverPositioningAlarm.COMMAND,
                ReceiverPositioningAlarm.SENDER_SRV_POSITIONING);
        pendingIntentPositioning = PendingIntent.getBroadcast(this, 0,
                intentToFire, 0);
    };

    @Override
    public void onStart(Intent intent, int startId) {
        try {
            long interval = 60 * 1000;
            int alarmType = AlarmManager.ELAPSED_REALTIME_WAKEUP;
            long timetoRefresh = SystemClock.elapsedRealtime();
            alarmManagerPositioning.setInexactRepeating(alarmType,
                    timetoRefresh, interval, pendingIntentPositioning);
        } catch (NumberFormatException e) {
            Toast.makeText(this,
                    "error running service: " + e.getMessage(),
                    Toast.LENGTH_SHORT).show();
        } catch (Exception e) {
            Toast.makeText(this,
                    "error running service: " + e.getMessage(),
                    Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

    @Override
    public void onDestroy() {
        this.alarmManagerPositioning.cancel(pendingIntentPositioning);
        ReceiverPositioningAlarm.stopLocationListener();
    }
}

リスナーとあなたの受信機。リスナーをアクティビティで使用して、新しい場所の準備ができたことを通知できます。

public class ReceiverPositioningAlarm extends BroadcastReceiver {

    public static final String COMMAND = "SENDER";
    public static final int SENDER_ACT_DOCUMENT = 0;
    public static final int SENDER_SRV_POSITIONING = 1;
    public static final int MIN_TIME_REQUEST = 5 * 1000;
    public static final String ACTION_REFRESH_SCHEDULE_ALARM =
                    "org.mabna.order.ACTION_REFRESH_SCHEDULE_ALARM";
    private static Location currentLocation;
    private static Location prevLocation;
    private static Context _context;
    private String provider = LocationManager.GPS_PROVIDER;
    private static Intent _intent;
    private static LocationManager locationManager;
    private static LocationListener locationListener = new LocationListener() {

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras){
            try {
                String strStatus = "";
                switch (status) {
                case GpsStatus.GPS_EVENT_FIRST_FIX:
                    strStatus = "GPS_EVENT_FIRST_FIX";
                    break;
                case GpsStatus.GPS_EVENT_SATELLITE_STATUS:
                    strStatus = "GPS_EVENT_SATELLITE_STATUS";
                    break;
                case GpsStatus.GPS_EVENT_STARTED:
                    strStatus = "GPS_EVENT_STARTED";
                    break;
                case GpsStatus.GPS_EVENT_STOPPED:
                    strStatus = "GPS_EVENT_STOPPED";
                    break;
                default:
                    strStatus = String.valueOf(status);
                    break;
                }
                Toast.makeText(_context, "Status: " + strStatus,
                        Toast.LENGTH_SHORT).show();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onProviderEnabled(String provider) {}

        @Override
        public void onProviderDisabled(String provider) {}

        @Override
        public void onLocationChanged(Location location) {
            try {
                Toast.makeText(_context, "***new location***",
                        Toast.LENGTH_SHORT).show();
                gotLocation(location);
            } catch (Exception e) {
            }
        }
    };

    // received request from the calling service
    @Override
    public void onReceive(final Context context, Intent intent) {
        Toast.makeText(context, "new request received by receiver",
                Toast.LENGTH_SHORT).show();
        _context = context;
        _intent = intent;
        locationManager = (LocationManager) context
                .getSystemService(Context.LOCATION_SERVICE);
        if (locationManager.isProviderEnabled(provider)) {
            locationManager.requestLocationUpdates(provider,
                    MIN_TIME_REQUEST, 5, locationListener);
            Location gotLoc = locationManager
                    .getLastKnownLocation(provider);
            gotLocation(gotLoc);
        } else {
            Toast t = Toast.makeText(context, "please turn on GPS",
                    Toast.LENGTH_LONG);
            t.setGravity(Gravity.CENTER, 0, 0);
            t.show();
            Intent settinsIntent = new Intent(
                    Android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            settinsIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            _context.startActivity(settinsIntent);
        }
    }

    private static void gotLocation(Location location) {
        prevLocation = currentLocation == null ? null : new Location(
                currentLocation);
        currentLocation = location;
        if (isLocationNew()) {
            OnNewLocationReceived(location);
            Toast.makeText(_context, "new location saved",
                    Toast.LENGTH_SHORT).show();
            stopLocationListener();
        }
    }

    private static boolean isLocationNew() {
        if (currentLocation == null) {
            return false;
        } else if (prevLocation == null) {
            return true;
        } else if (currentLocation.getTime() == prevLocation.getTime()) {
            return false;
        } else {
            return true;
        }
    }

    public static void stopLocationListener() {
        locationManager.removeUpdates(locationListener);
        Toast.makeText(_context, "provider stoped", Toast.LENGTH_SHORT)
                .show();
    }

    // listener ----------------------------------------------------
    static ArrayList<OnNewLocationListener> arrOnNewLocationListener = 
            new ArrayList<OnNewLocationListener>();

    // Allows the user to set a OnNewLocationListener outside of this class
    // and react to the event.
    // A sample is provided in ActDocument.Java in method: startStopTryGetPoint
    public static void setOnNewLocationListener(
            OnNewLocationListener listener) {
        arrOnNewLocationListener.add(listener);
    }

    public static void clearOnNewLocationListener(
            OnNewLocationListener listener) {
        arrOnNewLocationListener.remove(listener);
    }

    // This function is called after the new point received
    private static void OnNewLocationReceived(Location location) {
        // Check if the Listener was set, otherwise we'll get an Exception
        // when we try to call it
        if (arrOnNewLocationListener != null) {
            // Only trigger the event, when we have any listener
            for (int i = arrOnNewLocationListener.size() - 1; i >= 0; i--) {
                arrOnNewLocationListener.get(i).onNewLocationReceived(
                        location);
            }
        }
    }
}

リスナーのインターフェース：

import Android.location.Location;

public interface OnNewLocationListener {
    public abstract void onNewLocationReceived(Location location);
}

たった1ポイントを獲得するためのアクティビティ：

protected void btnGetPoint_onClick() {
    Intent intentToFire = new Intent(
            ReceiverPositioningAlarm.ACTION_REFRESH_SCHEDULE_ALARM);
    intentToFire.putExtra(ReceiverPositioningAlarm.COMMAND,
            ReceiverPositioningAlarm.SENDER_ACT_DOCUMENT);
    sendBroadcast(intentToFire);
    OnNewLocationListener onNewLocationListener = new OnNewLocationListener() {

        @Override
        public void onNewLocationReceived(Location location) {
            // use your new location here then stop listening
            ReceiverPositioningAlarm.clearOnNewLocationListener(this);
        }
    };
    // start listening for new location
    ReceiverPositioningAlarm
            .setOnNewLocationListener(onNewLocationListener);
}

編集：

アクティビティでサービスを開始する場合：

this.startService(new Intent(this, SrvPositioning.class));

同様に、受信者が見つけた場所を受信するために、サービスにリスナーを定義できます

編集

マニフェストに次の行を追加します

<service
            Android:name="org.mabna.order.services.SrvPositioning"
            Android:enabled="true" />

<receiver Android:name="org.mabna.order.receivers.ReceiverPositioningAlarm" >

            <!-- this Broadcast Receiver only listens to the following intent -->
            <intent-filter>
                <action Android:name="org.mabna.order.ACTION_REFRESH_SCHEDULE_ALARM" />
            </intent-filter>
        </receiver>

Answer 3

STEP 1：開くAndroidManifest.xmlとブロードキャストレシーバーを追加します。

<receiver
        Android:name=".Util.GpsConnectorReceiver"
        Android:enabled="true">
        <intent-filter>
            <!-- Intent filters for broadcast receiver -->
             <action Android:name="Android.location.PROVIDERS_CHANGED" />
            <category Android:name="Android.intent.category.DEFAULT" />
        </intent-filter>
    </receiver>`

ステップ2：ダイアログテーマでアクティビティを作成：

<activity
            Android:name=".Activity.ActivityDialogGps"
            Android:theme="@style/AppTheme.Dark.Dialog"></activity>

STEP 3： BroadcastReceiverクラスを作成GpsConnectorReceiver

public class GpsConnectorReceiver extends BroadcastReceiver {

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

   if (intent.getAction().matches("Android.location.PROVIDERS_CHANGED")) {
        Intent pushIntent = new Intent(context, ConnectivityCheck .class);
                context.startService(pushIntent);
    }
}}

ステップ4：ConnectivityCheckという名前の別のサービスクラスを作成します。

public class ConnectivityCheck extends Service {

@Override
public void onCreate() {
    super.onCreate();
    if (!checkConnection()) {
        Toast.makeText(context, "off", Toast.LENGTH_LONG).show();
        Intent dialogIntent = new Intent(this, ActivityDialogInternet.class);
        dialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(dialogIntent);
    }
    stopSelf();
}

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

private boolean checkConnection() {
     final LocationManager manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    return manager.isProviderEnabled(LocationManager.GPS_PROVIDER);

}}

STEP 5：というアクティビティを作成しますActivityDialogGps

public class ActivityDialogGps extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_dialog_gps);
}}

ステップ6： Gps接続がオフの場合ActivityDialogGps呼び出されてダイアログを表示します：