java.lang.IllegalArgumentException异常：无效的供应商：空开扩时MapsActivity

我只是复制粘贴从项目java.lang.IllegalArgumentException异常：无效的供应商：空开扩时MapsActivity

import android.Manifest; 
import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.content.pm.PackageManager; 
import android.location.Criteria; 
import android.location.Location; 
import android.location.LocationManager; 
import android.os.Bundle; 
import android.support.v4.app.ActivityCompat; 
import android.view.View; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 
import android.widget.Toast; 

import com.google.android.gms.location.LocationListener; 
import com.google.android.gms.maps.CameraUpdateFactory; 
import com.google.android.gms.maps.GoogleMap; 
import com.google.android.gms.maps.MapFragment; 
import com.google.android.gms.maps.model.LatLng; 
import com.google.android.gms.maps.model.MarkerOptions; 

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 


public class MapsActivity extends Activity implements LocationListener { 

private GoogleMap mMap;   // Null si les services Google Play APK ne sont pas disponible. 

// Ma position par defaut pour test 
private static final LatLng position_gps = new LatLng(43.701397, 1.838987); 

// Positions pour test des trackers 
private static final LatLng position_gps_track1 = new LatLng(43.602577, 1.362320); 
private static final LatLng position_gps_track2 = new LatLng(43.602529, 1.362634); 
private static final LatLng position_gps_track3 = new LatLng(43.602349, 1.362681); 
private static final LatLng position_gps_track4 = new LatLng(43.602767, 1.362435); 

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

    final ListView listview = (ListView) findViewById(R.id.listViewMap); 
    String[] values = new String[]{"00:44 - Alert Area", "10:24 - Connect Lost", "10:35 - BLE true", "10:40 - Alert Area", "10:49 - Alert Area", "11:43 - Connect Lost", "11:57 - BLE true"}; 

    final ArrayList<String> list = new ArrayList<String>(); 
    for (int i = 0; i < values.length; ++i) { 
     list.add(values[i]); 
    } 

    final StableArrayAdapter adapter = new StableArrayAdapter(this, 
      R.layout.list_view_ligne, list); 
    listview.setAdapter(adapter); 
    listview.setScrollBarStyle(View.SCROLLBARS_INSIDE_INSET); 

    LocationManager locationManager; 

    locationManager = (LocationManager) getSystemService(LOCATION_SERVICE); 

    Criteria criteria = new Criteria(); 

    // Recupere le nom du meilleur fournisseur disponible 
    String provider = locationManager.getBestProvider(criteria, true); 

    // Recupere la derniere position connue 

    Location location = locationManager.getLastKnownLocation(provider); 
    LatLng pos_gps; 
    if (location == null) { // SI on arrive pas a recuperer la position GPS 
     pos_gps = position_gps;  // Met la position GPS par defaut 
    } else {     // SINON recupere la position courante 
     pos_gps = new LatLng(location.getLatitude(), location.getLongitude()); 
    } 

    // Recupere la carte 
    mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap(); 
    if (mMap != null) { 
     // Ajout des trackers sur la carte 
     mMap.addMarker(new MarkerOptions().position(position_gps_track1).title("T1 - Thomas")); 
     mMap.addMarker(new MarkerOptions().position(position_gps_track2).title("T2 - Paul")); 
     mMap.addMarker(new MarkerOptions().position(position_gps_track3).title("T3 - Sebastien")); 
     mMap.addMarker(new MarkerOptions().position(position_gps_track4).title("T4 - Marc")); 

     // Affiche la carte par rapport a la position courante 
     mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(pos_gps, 15)); 
     mMap.animateCamera(CameraUpdateFactory.zoomTo(15), 2000, null); 
     mMap.setMyLocationEnabled(true);      // Affiche le bouton Ma Position 
     mMap.getUiSettings().setCompassEnabled(true);   // Affiche la boussole 
     mMap.getUiSettings().setZoomControlsEnabled(true);  // Affiche les boutons de Zoom 
    } else { 
     Toast.makeText(this, "Services GoogleMap indisponibles!", Toast.LENGTH_SHORT).show(); 
    } 
} 

@Override 
public void onLocationChanged(Location location) { 

    // Met a jour la position 
    int latitude = (int) (location.getLatitude()); 
    int longitude = (int) (location.getLongitude()); 
    LatLng position_gps = new LatLng(location.getLatitude(), location.getLongitude()); 
    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(position_gps, 15)); 
} 

private class StableArrayAdapter extends ArrayAdapter<String> { 

    HashMap<String, Integer> mIdMap = new HashMap<String, Integer>(); 

    public StableArrayAdapter(Context context, int textViewResourceId, 
           List<String> objects) { 
     super(context, textViewResourceId, objects); 
     for (int i = 0; i < objects.size(); ++i) { 
      mIdMap.put(objects.get(i), i); 
     } 
    } 

    @Override 
    public long getItemId(int position) { 
     String item = getItem(position); 
     return mIdMap.get(item); 
    } 

    @Override 
    public boolean hasStableIds() { 
     return true; 
    } 
} 
}

这项活动应该给予一定的LOcationInformation的代码的一部分，但是，当我开始活动，我的应用程序崩溃与此错误消息：

FATAL EXCEPTION: main 
    Process: package.connectivapp, PID: 7694 
    java.lang.RuntimeException: Unable to start activity ComponentInfo{package.connectivapp/package.connectivapp.MapsActivity}: java.lang.IllegalArgumentException: invalid provider: null 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707) 
    at android.app.ActivityThread.-wrap12(ActivityThread.java) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:154) 
    at android.app.ActivityThread.main(ActivityThread.java:6077) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 
    Caused by: java.lang.IllegalArgumentException: invalid provider: null 
    at android.location.LocationManager.checkProvider(LocationManager.java:2248) 
    at android.location.LocationManager.getLastKnownLocation(LocationManager.java:1199) 
    at package.connectivapp.MapsActivity.onCreate(MapsActivity.java:72) 
    at android.app.Activity.performCreate(Activity.java:6662) 
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)  
    at android.app.ActivityThread.-wrap12(ActivityThread.java)  
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)  
    at android.os.Handler.dispatchMessage(Handler.java:102)  
    at android.os.Looper.loop(Looper.java:154)  
    at android.app.ActivityThread.main(ActivityThread.java:6077)  
    at java.lang.reflect.Method.invoke(Native Method)  
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)  
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)  
02-23 09:20:41.705 1589-2845/system_process W/ActivityManager: Force finishing activity package.connectivapp/.MapsActivity 
02-23 09:20:41.712 1589-2845/system_process W/ActivityManager: Force finishing activity package.connectivapp/.MainActivity

我知道我没有以很好的方式实现我的Google API。在第一时间，我添加元数据到我的清单：

<meta-data 
     android:name="com.google.android.maps.v2.API_KEY" 
     android:value="[A Big String]" />

，并加入我的项目结构的依赖性“com.google.android.gms：7.5.0：发挥服务”。

知道，我不知道为什么我的应用程序崩溃，你有什么想法吗？

来源

2017-02-23 AndroidNewbie

getBestProvider返回null，检查：HTTP：//计算器。com/questions/38696068/why-does-locationmanager-getbestprovider-returns-null-nexus-5x – X3Btel

确保将android.permission.ACCESS_FINE_LOCATION或android.permission.ACCESS_COARSE_LOCATION添加到您的Manifest文件中，这为我解决了问题（所有提供程序都已在位置设置中启用）。

用户需要允许位置权限的应用程序，所以如果你在23 API从API级别23日起运行请执行下列操作

if (ContextCompat.checkSelfPermission(this, 
      Manifest.permission.ACCESS_FINE_LOCATION) 
      != PackageManager.PERMISSION_GRANTED) { 
     // No explanation needed, we can request the permission. 

     ActivityCompat.requestPermissions(this, 
       new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 
       MY_PERMISSIONS_REQUEST_FINE_LOCATION); 

     // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an 
     // app-defined int constant. The callback method gets the 
     // result of the request. 
} else { 
     //Permission is granted 
}

你也需要重写此方法：

@Override 
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { 
    switch (requestCode) { 
     case MY_PERMISSIONS_REQUEST_FINE_LOCATION: { 
      // If request is cancelled, the result arrays are empty. 
      if (grantResults.length > 0 
        && grantResults[0] == PackageManager.PERMISSION_GRANTED) { 

       // permission was granted 
      } else { 
       // permission denied, boo! Disable the 
       // functionality that depends on this permission. 
       showAlert(getString(R.string.error), getString(R.string.message)); 
      } 
     } 

     // other 'case' lines to check for other 
     // permissions this app might request 
    } 
}

如果你是罚款降级API版本，那么这样做：

变化的build.gradle如下所示的一样：

compileSdkVersion 21

buildToolsVersion “21.1.2”

希望它能帮助。

来源

2017-02-23 10:45:54

当你说它是一个'应用程序定义的'常量时，你说我必须自己定义它，无法解析MY_PERMISSIONS_REQUEST_FINA_LOCATION，？在哪个值？ – AndroidNewbie

请勿使用直接提供程序字符串，因为不能保证它在运行时存在。你从的LocationManager获得，这样

只能使用商：

LocationManager locationManager = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE); 

     Criteria criteria = new Criteria(); 
     criteria.setAccuracy(Criteria.ACCURACY_COARSE); 
     String provider = locationManager.getBestProvider(criteria, true); 

     if (provider == null) { 
      Log.e(TAG, "No location provider found!"); 
      return; 
     } 

     lastLocation = locationManager.getLastKnownLocation(provider);

，并确保android.permission.ACCESS_FINE_LOCATION或android.permission.ACCESS_COARSE_LOCATION添加到您的清单文件。

如果您的代码运行得更高，那么Andoird 5.0也会检查premissions。

而且还尝试使用Fused Location API ...位置管理器是旧的方式来获取位置。

来源

2017-02-23 10:47:08 Umar

后

<meta-data 
    android:name="com.google.android.maps.v2.API_KEY" 
    android:value="[A Big String]" />

把这个元

<meta-data 
     android:name="com.google.android.gms.version" 
     android:value="@integer/google_play_services_version" />

来源

2017-02-23 11:00:46

java.lang.IllegalArgumentException异常：无效的供应商：空开扩时MapsActivity

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