无法获取Android中的用户位置 [英] Unable to get user location in android

问题描述

每次我运行下面的代码时，日志都会显示无位置".我不知道我要去哪里错了.

Everytime I run the code below, the log spits out "no location". I do not know where I am going wrong.

我已在清单中启用了定位服务，如下所示:

I have enabled the location services in the manifest like so :

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

我应该指出，我尝试在nexus 4(API 22)和虚拟设备(API 16，21，22)上运行此应用程序，但无济于事.

I should point out that I tried running this app on my nexus 4(API 22), and on the virtual device (API 16, 21, 22) but to no avail.

public class MainActivity extends Activity implements LocationListener {

LocationManager locationManager;
String provider;
Location location;

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

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

    provider = locationManager.getBestProvider(new Criteria(), false);

    try {
         location = locationManager.getLastKnownLocation(provider);
    } catch (SecurityException e) {
        Log.d("SE", e.getMessage());
    }

    if (location != null) {

        Log.i("Location Info", "Location achieved!");

    } else {

        Log.i("Location Info", "No location :(");

    }
}

我将不胜感激.

推荐答案

getLastKnownLocation()将始终返回 null ，除非设备上的某些应用最近已请求位置更新使用特定的位置提供商.

getLastKnownLocation() will always return null, unless some app on the device has recently requested location updates using the particular location provider.

使用 getLastKnownLocation()之一:

• 当您对某个位置感兴趣时，如果它碰巧很方便，但如果没有该位置，便可以生活下去，或者

• when you are interested in a location if one happens to be handy, but otherwise can live without it, or

作为优化，如果 getLastKnownLocation()返回 null 或 Location，则使用 requestLocationUpdates()您认为太老了

as an optimization, where you use requestLocationUpdates() if getLastKnownLocation() either returns null or a Location that you deem to be too old

有关何时使用各种工具的更多指南，请参见文档. LocationManager 上的方法.

See the documentation for more guidance on when to use the various methods on LocationManager.

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