Question

因此,我基本上想开始聆听从<条码>广播接收器/代码”的单一更新,并出于某种原因,所有供应商都无法进入。这里是法典。

LocationManager locationManager = (LocationManager)
                            context.getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
criteria.setPowerRequirement(Criteria.POWER_LOW);
String majorProvider = locationManager.getBestProvider(criteria, true);
Log.d("location test", "major provider " + majorProvider);
List<String> allProviders = locationManager.getAllProviders();
for(int i=0; i < allProviders.size();i++) {
    Log.d("location test", "provider " + i + ": " + allProviders.get(i));
}
Log.d("location test", "enabled...");
allProviders = locationManager.getProviders(true);
for(int i=0; i < allProviders.size();i++) {
    Log.d("location test", "enabled provider " + i + ": " + allProviders.get(i));
}

和我的标识结果

04-09 11:23:35.763: D/location test(32576): major provider null
04-09 11:23:35.763: D/location test(32576): provider 0: network
04-09 11:23:35.763: D/location test(32576): provider 1: passive
04-09 11:23:35.763: D/location test(32576): provider 2: gps
04-09 11:23:35.763: D/location test(32576): enabled...

我猜测,问题在于,我从一个<条码>广播接收器<>/代码>上说了所有这一切,但我试图从其他地方转过来。不可能从<条码>BroadcastReceiver进入地点管理?

Answer 1

那么,我就象这样说。这完全是一个许可问题。如果任何人再次这样做,就只增加使用许可以表明

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

Answer 2

诚然,除了明显的许可声明外,你还可能需要人工向用户申请与地点有关的许可。在批准后,请打电话getProviders,BestProvider。

String[] perms = {Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION};    
ActivityCompat.requestPermissions(this, perms, REQ_LOCATION_PERMISSION);

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