image.png

目录

LocationManager

LocationManager是Android 提供的Location 服务，来获得当前的位置信息和卫星信息。

要使用它，先得获得系统所提供的location_service．

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

定位服务的提供一般有3种：

• GPS_PROVIDER GPS获得
• NETWORK_PROVIDER 网络获得
• PASSIVE_PROVIDER 被动提供其他应用程序提供

通过api获取现有支持的定位服务模式：

lm.getAllProviders();

代码实战

xml文件：

<?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"><ListViewandroid: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>

代码文件：

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;@Overrideprotected 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);}
}

获取定位

使用requestLocationUpdates注册监听，定时获取定位hal service返回的数据

整体项目如下：

manifest.xml

<?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"/><applicationandroid: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>

active_main.xml

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 {@Testpublic void useAppContext() {// Context of the app under test.Context appContext = InstrumentationRegistry.getTargetContext();assertEquals("com.example.user.gps", appContext.getPackageName());}
}

代码：

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;@Overrideprotected 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(){@Overridepublic void onLocationChanged(Location location) {// TODO Auto-generated method stubLog.d("test", "onLocationChanged");//更新当前设备的位置信息showLocation(location);}@Overridepublic void onProviderDisabled(String provider) {// TODO Auto-generated method stub}@Overridepublic void onProviderEnabled(String provider) {// TODO Auto-generated method stub}@Overridepublic 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());}}