2

对android有些陌生，需要一些服务帮助。我有一个服务，它以间隔 X 轮询当前位置。我想绑定到该服务并将 getLastKnownLocation 从服务传递到我的活动 A。我不确定信息是如何从绑定服务传递到活动的，如果它通过活页夹什么的。无论如何，这是我到目前为止的代码。

服务：

public class LocationService extends Service implements LocationListener {


    LocationManager myLocationManager;
    public Location myLocation;
    LocationListener myLocationListener;
    public static final String TAG = LocationService.class.getSimpleName();
    MyDB db;
    double latitude,longitude;
    Cursor c;

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
        Log.d(TAG, "service started (onCreate)");
        db = new MyDB(getApplicationContext());
        myLocationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

        Criteria criteria = new Criteria();
        criteria.setPowerRequirement(Criteria.POWER_LOW);
        criteria.setAccuracy(Criteria.ACCURACY_LOW);
        String locationProvider = myLocationManager.getBestProvider(criteria, true);
        myLocationManager.requestLocationUpdates(locationProvider, 1000*60*2, 100, this);
        myLocation = myLocationManager.getLastKnownLocation(locationProvider);


    }
 public class MyBinder extends Binder {
            LocationService getService() {
                return LocationService.this;
            }
        }

活动一：

public class myActivity extends Activity {
    LocationManager myLocationManager;
    Location myLocation;

    boolean isBound = false;

    private LocationService mBoundService;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


        bindLocationService();

}
private void bindLocationService() {
        try {
            isBound = getApplicationContext().bindService( new Intent(getApplicationContext(), LocationService.class), mConnection, BIND_AUTO_CREATE );
            bindService(new Intent(this, LocationService.class), mConnection, BIND_AUTO_CREATE);
        } catch (SecurityException e) {
            // TODO: handle exception
        }
    }
private ServiceConnection mConnection = new ServiceConnection() {
        public void onServiceConnected(ComponentName className, IBinder service) {
            mBoundService = ((LocationService.MyBinder)service).getService();
            Log.d(LocationService.TAG, "activity bound to service");

        }

        public void onServiceDisconnected(ComponentName className) {

            mBoundService = null;
            Log.d(LocationService.TAG, "activity unbound to service");
        }
    };
}
4

3 回答 3

4

从您的服务发送广播，如下所示：

Intent i = new Intent(NEW_MESSAGE);  
Bundle bundle = new Bundle();
bundle.putString("yourvalue", value);
i.putExtras(bundle);
sendBroadcast(i);

并像这样在您的活动中注册接收者：

newMessage messageReceiver = new newMessage();
registerReceiver(messageReceiver, new IntentFilter(NEW_MESSAGE));

这是您在活动课程中的接收者：

public class newMessage extends BroadcastReceiver 
{
    @Override
    public void onReceive(Context context, Intent intent) 
    {    
        String action = intent.getAction();
        if(action.equalsIgnoreCase(IMService.NEW_MESSAGE)){    
        Bundle extra = intent.getExtras();
        String username = extra.getString("yourvalue");
    }
}
于 2012-04-16T18:39:59.110 回答
2

对于 Service 和您的 Activity 之间的通信创建自定义BroadcastReceiver并在每次您想使用 Intent 更新您的 Activity 时从 Service 广播它，其中包含新的位置信息。

    Intent i = new Intent();
    i.setAction(CUSTOM_INTENT);
    context.sendBroadcast(i);

请参阅此示例以了解自定义广播

于 2012-04-16T18:32:57.123 回答
0

你必须“订阅”你Activity的Service它绑定。Service可以Messenger通过Intent从Activity. _ Handler所以你可以在你的内部定义一个简单的Activity和一个Messenger使用它的。通过这种方式，Service可以将类型Message的对象发送到Activity，将您需要的所有信息发送到其内部Message。

于 2012-04-16T18:36:14.817 回答