位置定位(LocationManager)

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

lm.getAllProviders();

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <ListView
        android:id="@+id/pro"
        android:layout_width="368dp"
        android:layout_height="495dp"
        tools:layout_editor_absoluteX="20dp"
        tools:layout_editor_absoluteY="20dp" />
</android.support.constraint.ConstraintLayout>

package com.example.user.location;

import android.content.Context;
import android.location.LocationManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.List;

public class MainActivity extends AppCompatActivity {

    ListView providers;
    LocationManager lm;

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

        providers = (ListView)findViewById(R.id.pro);
        lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

        List<String> provideNames = lm.getAllProviders();

        ArrayAdapter<String> adapter = new ArrayAdapter<>(this,
                android.R.layout.simple_list_item_1,
                provideNames);

        providers.setAdapter(adapter);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.user.gps">
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

package com.example.user.gps;

import android.content.Context;
import android.support.test.InstrumentationRegistry;
import android.support.test.runner.AndroidJUnit4;

import org.junit.Test;
import org.junit.runner.RunWith;

import static org.junit.Assert.*;

/**
 * Instrumented test, which will execute on an Android device.
 *
 * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
 */
@RunWith(AndroidJUnit4.class)
public class ExampleInstrumentedTest {
    @Test
    public void useAppContext() {
        // Context of the app under test.
        Context appContext = InstrumentationRegistry.getTargetContext();

        assertEquals("com.example.user.gps", appContext.getPackageName());
    }
}

package com.example.user.gps;

import android.annotation.SuppressLint;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import org.json.JSONObject;

import java.util.List;

public class MainActivity extends AppCompatActivity {

    private TextView positionTextView;
    private TextView positionLatLng;
    private LocationManager locationManager;
    private String provider;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        positionTextView=(TextView)findViewById(R.id.position_text_view);
        positionLatLng=(TextView)findViewById(R.id.position_plain_text);
        locationManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
        //获取所有可用的位置提供器

        provider=LocationManager.GPS_PROVIDER;

        Location location=locationManager.getLastKnownLocation(provider);
        if(location!=null){
            //显示当前设备的位置信息
            Log.d("lidu---", "location!=null");
            showLocation(location);
        }

        Log.d("lidu---", "location==null");
        locationManager.requestLocationUpdates(provider, 1000, 1, locationListener);
    }


    //LocationListener 用于当位置信息变化时由 locationManager 调用
    LocationListener locationListener=new LocationListener(){

        @Override
        public void onLocationChanged(Location location) {
            // TODO Auto-generated method stub
            Log.d("test", "onLocationChanged");
            //更新当前设备的位置信息
            showLocation(location);
        }

        @Override
        public void onProviderDisabled(String provider) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onProviderEnabled(String provider) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            // TODO Auto-generated method stub

        }

    };

    private void showLocation(final Location location){
        StringBuilder sb = new StringBuilder();
        sb.append(location.getLatitude());
        positionTextView.setText(sb.toString());

    }

}