相关疑难解决方法(0)

我有一群人报告了一个我无法重现的错误.当试图打开MapView它报告getBestProvider返回null并且我知道这意味着没有找到符合我的标准的提供者,ACCURACY_COARSE如果没有GPS那么它应该回落到任何一个,network or passive但它显然不在那些用户设备.那甚至意味着GPS关闭并且没有网络连接？

我尝试关闭GPS并将手机置于飞行模式以尝试重现问题,但我仍然能够在没有强制关闭的情况下打开mapview,所以我不知道如何处理这个问题.

locationManager = (LocationManager) this.getSystemService(LOCATION_SERVICE);
geocoder = new Geocoder(this);

Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_COARSE);
List<String> lProviders = locationManager.getProviders(false);
for(int i=0; i<lProviders.size(); i++){
    Log.d("LocationActivity", lProviders.get(i));
}
String provider = locationManager.getBestProvider(criteria, true); // null

long minTime = 60000;
float minDistance = 5;

locationManager.requestLocationUpdates(provider, minTime, minDistance, this);

错误

java.lang.RuntimeException: Unable to start activity ComponentInfo{ecm2.android/ecm2.android.LocationActivity}: 
java.lang.IllegalArgumentException: provider==null
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
at android.app.ActivityThread.access$2300(ActivityThread.java:125)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at …