将位置更新发送到IntentService
位置更新如何直接发送到意向服务？ 以下方法不起作用。 OnConnected函数被调用，但在服务中从不接收意图：
...
private PendingIntent getLocationPendingIntent(boolean shouldCreate) {
Intent broadcast = new Intent(m_context,LocationUpdateService.class);
int flags = shouldCreate ? 0 : PendingIntent.FLAG_NO_CREATE;
return PendingIntent.getService(m_context, 0, broadcast, flags);
}
@Override
public void onConnected(Bundle arg0) {
PendingIntent locationPendingIntent = getLocationPendingIntent(true);
LocationRequest locationRequest = new LocationRequest();
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationRequest.setInterval(LOCATION_UPDATE_INTERVAL);
locationRequest.setFastestInterval(LOCATION_FASTEST_UPDATE_INTERVAL);
LocationServices.FusedLocationApi.requestLocationUpdates(m_googleApiClient, locationRequest,locationPendingIntent);
}
...
意向服务：
import android.app.IntentService;
import android.content.Intent;
import android.util.Log;
public class LocationUpdateService extends IntentService {
public LocationUpdateService() {
super(LocationUpdateService.class.getName());
}
@Override
public int onStartCommand(Intent intent, int flags, int startID) {
super.onStartCommand(intent, flags, startID);
Log.d("LocationUpdateService","Location received");
return START_REDELIVER_INTENT;
}
@Override
protected void onHandleIntent(Intent intent) {
Log.d("LocationUpdateService","Intent received");
}
}
清单文件：
...
<service android:name=".LocationUpdateService" />
...
这里是工作和测试的代码，它们成功地将IntentService设置为用于位置更新的PendingIntent中包含的Intent的接收器，基于此处的代码。
首先， IntentService ：
import android.app.IntentService;
import android.content.Intent;
import android.location.Location;
import android.util.Log;
import com.google.android.gms.location.FusedLocationProviderApi;
import com.google.android.gms.location.LocationResult;
public class LocationUpdateService extends IntentService {
private final String TAG = "LocationUpdateService";
Location location;
public LocationUpdateService() {
super("LocationUpdateService");
}
@Override
protected void onHandleIntent(Intent intent) {
if (LocationResult.hasResult(intent)) {
LocationResult locationResult = LocationResult.extractResult(intent);
Location location = locationResult.getLastLocation();
if (location != null) {
Log.d("locationtesting", "accuracy: " + location.getAccuracy() + " lat: " + location.getLatitude() + " lon: " + location.getLongitude());
}
}
}
}
这里是活动代码，用于发送到IntentService的PendingIntent注册位置更新：
import android.app.PendingIntent;
import android.os.Bundle;
import android.content.Intent;
import android.app.Activity;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
public class MainActivity extends Activity implements
GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
PendingIntent mRequestLocationUpdatesPendingIntent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buildGoogleApiClient();
mGoogleApiClient.connect();
}
@Override
protected void onPause(){
super.onPause();
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, mRequestLocationUpdatesPendingIntent);
}
}
protected synchronized void buildGoogleApiClient() {
Toast.makeText(this,"buildGoogleApiClient",Toast.LENGTH_SHORT).show();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
@Override
public void onConnected(Bundle bundle) {
Toast.makeText(this,"onConnected",Toast.LENGTH_SHORT).show();
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(10);
mLocationRequest.setFastestInterval(10);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
//mLocationRequest.setSmallestDisplacement(0.1F);
// create the Intent to use WebViewActivity to handle results
Intent mRequestLocationUpdatesIntent = new Intent(this, LocationUpdateService.class);
// create a PendingIntent
mRequestLocationUpdatesPendingIntent = PendingIntent.getService(getApplicationContext(), 0,
mRequestLocationUpdatesIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
// request location updates
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,
mLocationRequest,
mRequestLocationUpdatesPendingIntent);
}
@Override
public void onConnectionSuspended(int i) {
Toast.makeText(this,"onConnectionSuspended",Toast.LENGTH_SHORT).show();
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Toast.makeText(this,"onConnectionFailed",Toast.LENGTH_SHORT).show();
}
}
结果日志：
D/locationtesting﹕ accuracy: 10.0 lat: 37.779702 lon: -122.3931595
D/locationtesting﹕ accuracy: 10.0 lat: 37.7797023 lon: -122.3931594
D/locationtesting﹕ accuracy: 10.0 lat: 37.7797022 lon: -122.3931596
D/locationtesting﹕ accuracy: 10.0 lat: 37.7797021 lon: -122.3931597
D/locationtesting﹕ accuracy: 10.0 lat: 37.7797021 lon: -122.3931596
D/locationtesting﹕ accuracy: 10.0 lat: 37.7797019 lon: -122.3931597
D/locationtesting﹕ accuracy: 10.0 lat: 37.7797019 lon: -122.3931597
意图服务本质上指的是终端任务，例如从调用活动或片段接收意图，在单独的线程上启动某个任务，并以静默方式完成，而不通知任何实体终止。 还有一个注释文档，onStartCommand不应该为Intent Services（[IntentService] [1]）重写。 我的猜测是，当你期望它的存在时，你的服务会自动结束，因此意图不能正确传送。
绑定服务将是一个更合适的选择，因为它们允许不同的组件连接到自己并执行所需的通信。
你不能直接做 - 我的意思是requestLocationUpdates并在IntentService获取这些更新。
你可以做的是在后台有一个Service ，通过requestLocationUpdates请求这些更新，并且在你想要的所有时间运行（记住设备入睡的情况）。 然后从那个Service当位置更新被接收时，它向IntentService并在那里处理。
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