安卓6.0 ，第一行代码11章节，获取位置信息不显示

安卓6.0 ，获取位置信息，不显示

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MainActivity.java

public class MainActivity extends AppCompatActivity {
    private TextView positionTextView;
    private LocationManager locationManager;
    private String provider;
    private Location location;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        positionTextView = (TextView) findViewById(R.id.position_text_view);
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        //获取所有可用的位置提供器
        List<String> providerList = locationManager.getProviders(true);
        if (providerList.contains(LocationManager.GPS_PROVIDER)) {
            provider = LocationManager.GPS_PROVIDER;
        } else if (providerList.contains(LocationManager.NETWORK_PROVIDER)) {
            provider = LocationManager.NETWORK_PROVIDER;
        } else {
            //当没有可用的位置提供器时，提示用户,并结束程序
            Toast.makeText(this, "No Location Provider to use", Toast.LENGTH_SHORT).show();
            return;
        }
        try {
            location = locationManager.getLastKnownLocation(provider);
        } catch (SecurityException e) {
            e.printStackTrace();
        }
        if (location != null) {
            showLocation(location);
        }

        try {
            //实时更新地理信息
            locationManager.requestLocationUpdates(provider, 5000, 1, locationListener);
        } catch (SecurityException e) {
            e.printStackTrace();
        }

    }

    LocationListener locationListener = new LocationListener() {
        @Override
        public void onLocationChanged(Location location) {
            showLocation(location);
        }

        @Override
        public void onStatusChanged(String s, int i, Bundle bundle) {

        }

        @Override
        public void onProviderEnabled(String s) {

        }

        @Override
        public void onProviderDisabled(String s) {

        }
    };

    //设置positionTextView的值并显示
    private void showLocation(Location location) {
        String currentPosition = "latitude" + location.getLatitude() +
                "\n" + "longitude is" + location.getLongitude();
        positionTextView.setText(currentPosition);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (locationManager != null) {
            //关闭程序时将监听器移除
            try {
                locationManager.removeUpdates(locationListener);
            } catch (SecurityException e) {
                e.printStackTrace();
            }
        }
    }
}

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XML布局

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.xhq.locationtest.MainActivity">

    <TextView
        android:id="@+id/position_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

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6.0需要主动去获取运行时权限
可以看看我之前写的博客

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国内用不了的，你用高德地图吧

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权限问题，要用运行时权限

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GPS权限加了没？还是你开启应用的时候是在室内，在室内GPS是获取不到位置信息的。而且LocationManager.NETWORK_PROVIDER默认是谷歌地图，国内用不了。

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6.0需要在代码中主动申请权限，不仅仅是manifest 声明