NETWORK_PROVIDER 未在 android 工作

Question

我为用户构建应用程序以获取上次位置或当前位置。我同时使用 NETWORK_PROVIDER 和 GPS_PROVIDER。我对 NETWORK_PROVIDER 没什么问题。

1.When 我在 Micromax 单元 2 中使用 NEWTWORK_PROVIDER 而不是应用程序崩溃，当我使用 GPS_PROVIDER 时应用程序运行良好。同一应用程序在三星和 XIOMI 设备上运行良好，同时使用这两个提供商。这背后有什么原因吗？

NETWORK_PROVIDER是否只支持有限版本？
如果某些设备不支持 NETWORK_PROVIDER 那么在没有 GPS 的情况下我该怎么做才能获得当前位置？

这是我的代码：

    private void beginAcquiringLocation() {

    //Log.d(TAG, "Beginning location acquisition");
    logStatus("Requesting location update.");

    // we don't want to be killed while handling data transmission in another thread
    // to guarantee we don't take an eternal lock even in case of bugs, set a timeout
    acquireWakeLock(WAKELOCK_TIME_DEFAULT);

    LocationManager locationManager =(LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
    Criteria crit = new Criteria();
    String provider = locationManager.getBestProvider(crit, false);
    Location location = locationManager.getLastKnownLocation(provider);

    Log.d("LOCATION>>>>>>>>>>>", String.valueOf(location));

    Log.d("Provider---------->>>>>>>>", provider);
     // no significant time or distance minima, we'll decide if it's usable when we get a coord
    locationManager.requestLocationUpdates(provider, 500, 0, this);

    if(String.valueOf(location).equals("null")){

        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 500, 0, this);
        Location l=locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
        Log.d("-------Location default----->>>>>>>", String.valueOf(l));


    }
    // next action in process is in the callback upon receiving a location update

    // to prevent endless listening if no updates are ever received, we need to schedule a timeout
    timeoutHandler.removeCallbacks(timeoutTask);
    timeoutHandler.postDelayed(timeoutTask, timeoutDelay);
}

Answer 1

我说废话，你用这个吗？

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

Answer 2

您应该使用 Google 的新融合位置 API 连接到 Google Play 服务，而不是使用旧版 LocationManager，您可以获得最后已知位置和当前位置，这里是如何获取最后已知位置：

 protected synchronized void buildGoogleApiClient() {
 mGoogleApiClient = new GoogleApiClient.Builder(this)
    .addConnectionCallbacks(this)
    .addOnConnectionFailedListener(this)
    .addApi(LocationServices.API)
    .build();
}


public class MainActivity extends ActionBarActivity implements
    ConnectionCallbacks, OnConnectionFailedListener {
...
@Override
public void onConnected(Bundle connectionHint) {
    mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
            mGoogleApiClient);
    if (mLastLocation != null) {
        mLatitudeText.setText(String.valueOf(mLastLocation.getLatitude()));
        mLongitudeText.setText(String.valueOf(mLastLocation.getLongitude()));
      }
  }
}

更多细节查看官方示例here

在你的 Manifest.xml 中：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.google.android.gms.location.sample.basiclocationsample" >

  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
</manifest>

Answer 3

Micromax Unit 2 有一个 A-GPS，所以如果应用程序崩溃很奇怪：你有更多关于这个的日志吗？
对我来说，有3种情况：

gps –> (GPS, AGPS) Requires the permission android.permission.ACCESS_FINE_LOCATION.

network –> (AGPS, CellID, WiFi MACID) Requires either of the permissions android.permission.ACCESS_COARSE_LOCATION or android.permission.ACCESS_FINE_LOCATION.

passive –> (CellID, WiFi MACID) Requires the permission android.permission.ACCESS_FINE_LOCATION, although if the GPS is not enabled this provider might only return coarse fixes.

如果您需要更多信息，可以参考：http://developerlife.com/tutorials/?p=1375

Answer 4

您可以通过以下代码获取 Gps 或网络提供商是否可用。

mLocationManager = (LocationManager) context.getSystemService(LOCATION_SERVICE);
boolean isGPSEnabled = mLocationManager.isProviderEnabled
                                                 (LocationManager.GPS_PROVIDER);
boolean isNetworkEnabled = mLocationManager.isProviderEnabled
                                             (LocationManager.NETWORK_PROVIDER);

但我强烈建议您使用融合位置。检查 this and this.

NETWORK_PROVIDER 未在 android 工作

NETWORK_PROVIDER not Working in android

java

android

locationmanager