Android 获取经纬度的服务
Android 获取经纬度的服务
使用原生Android API 编写一个Service类获取经纬度信息(本文仅作为学习笔记来使用，若侵犯到您的权益，请及时与我联系，我会删除涉及侵犯到您的内容)。
一， 实现步骤
- 添加对应的权限
- 编写Service类实现获取经纬度的功能
- 将获取的经纬度使用广播传递到MainAtivity做数据的展示
- 踩过的坑
二，代码实现
1).在AndroidManifest.xml添加权限
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />2).编写Service类
Service继承IntentService类，并实现了LocationListener接口，具体代码如下
public class LocationListenerService extends IntentService implements LocationListener {
public static final String TAG = "LocationListenerService";
public static final String SERVICE_NAME = "LocationListenerService";
private LocationManager locationManager;
private int count=0;
/**
* Creates an IntentService. Invoked by your subclass's constructor.
*
*/
public LocationListenerService() {
super(SERVICE_NAME);
}
@Override
protected void onHandleIntent(@Nullable Intent intent) {
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// 检查定位服务是否打开
if (locationManager.getProvider(LocationManager.NETWORK_PROVIDER) != null
|| locationManager.getProvider(LocationManager.GPS_PROVIDER) != null) {
Log.i(TAG, "正在定位");
// Permission check
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
//设置数据更新的条件，参数分别为1，使用GPS 2，最小时间间隔 3000毫秒 3，最短距离 100 4,设置事件监听者 this(类继承了Locationlistener)
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3000, 100, this);
} else {
Log.i(TAG, "无法定位");
Toast.makeText(this, "无法定位，请打开定位服务", Toast.LENGTH_SHORT).show();
Intent i = new Intent();
i.setAction(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(i);
}
}
@Override
public void onLocationChanged(Location location) {
Log.i(TAG, "LocationChanged");
double latitude = location.getLatitude();
Log.i(TAG, "纬度 =" + latitude);
double longitude = location.getLongitude();
Log.i(TAG, "经度 =" + longitude);
//将location作为参数传递给广播
BCL(location);
}
/**
* 将经纬度信息赋值给一个ArrayList
* @param location
* @return arraylist
*/
private ArrayList getConcretMessage(Location location) {
ArrayList arrayList=new ArrayList();
arrayList.add(location.getProvider()+"");
arrayList.add(location.getAccuracy()+"");
arrayList.add(location.getAltitude()+"");
arrayList.add(location.getBearing()+"");
arrayList.add(location.getExtras()+"");
arrayList.add(location.getSpeed()+"");
arrayList.add(location.getLatitude()+"");
arrayList.add(location.getLongitude()+"");
return arrayList ;
}
/**
* 使用广播将经纬度等信息传递出去
* @param location
*/
private void BCL(Location location) {
PendingIntent pi = getPI(location);
//permission check
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
//第四个参数为PendingIntent
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 9000, 1000, pi);
}
/**
*
* @param location
* @return 返回一个已包装数据的PendingIntent
*/
private PendingIntent getPI(Location location) {
Intent intent = new Intent();
intent.setAction("location1");
for(int i=0;i"DATA"+i,getConcretMessage(location).get(i));
if(count>=8){
count=0;
count++;
}else{
count++;
}
}
intent.putExtra("DATA",count+"");
return PendingIntent.getBroadcast(getApplication(), 1000, intent, PendingIntent.FLAG_UPDATE_CURRENT);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onDestroy() {
super.onDestroy();
Log.i(TAG, "onDestroy");
}
@Override
public int onStartCommand(@Nullable Intent intent, int flags, int startId) {
Log.i(TAG, "onStartCommand");
startId=START_NOT_STICKY;
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onCreate() {
super.onCreate();
Log.i(TAG, "onCreate");
}
} 3).Service类编写完毕，将Service在AndroidManifest.xml注册
<service android:name=".LocationListenerService">
<intent-filter>
<action android:name="locationlistener"/>
intent-filter>
service>4).编写实现类，并做数据展示
public class MainActivity extends AppCompatActivity {
private boolean CL=true;
TextView textView;
ListView listme;
private static final String TAG ="LocationListenerService" ;
private BC bc=new BC();
private String[] str=new String[8];
private ArrayList nameList=new ArrayList();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initData();
initUI();
}
/**
* 初始化listvie数据
*/
private void initData() {
nameList.add("Provider :");
nameList.add("Accuracy :");
nameList.add("Altitude :");
nameList.add("Bearing :");
nameList.add("Extras :");
nameList.add("Speed:");
nameList.add("Latitude:");
nameList.add("Longitude:");
for(int i=0;i<8;i++){
str[i]="initting";
}
}
private void initUI() {
textView=(TextView)findViewById(R.id.text2);
listme=(ListView)findViewById(R.id.listme);
Button text_show=(Button)findViewById(R.id.text_show);
text_show.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startServer();
}
});
}
@Override
protected void onResume()
{
super.onResume();
//动态注册广播
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("location1");
registerReceiver(bc, intentFilter);
}
//自定义 BroadcastReceiver
public class BC extends BroadcastReceiver {
public static final String TAG="BC";
@Override
public void onReceive(Context context, Intent intent) {
int count=Integer.parseInt(intent.getStringExtra("DATA"));
for(int i=0;i"DATA"+i);
}
//为数据展示所在的listview添加一个适配器
listme.setAdapter(new MyAdapter());
}
}
//自定义数据适配器
public class MyAdapter extends BaseAdapter{
@Override
public int getCount() {
return nameList.size();
}
@Override
public Object getItem(int position) {
return nameList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view=View.inflate(getApplicationContext(),R.layout.list_view,null);
TextView text_name=(TextView)view.findViewById(R.id.text_name);
TextView text_value=(TextView)view.findViewById(R.id.text_value);
text_name.setText(nameList.get(position));
text_value.setText(str[position]);
return view;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
//解绑广播接收者
unregisterReceiver(bc);
}
@Override
protected void onRestart() {
super.onRestart();
startServer();
}
/**
* 开启服务
*/
public void startServer(){
Intent intent = new Intent(MainActivity.this,LocationListenerService.class);
startService(intent);
}
}
5),MainActivity所用到的布局文件
1.activity_main.xml
<RelativeLayout 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"
tools:context="com.example.a15082.locationtest.MainActivity">
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/listme">
ListView>
<Button
android:layout_width="match_parent"
android:padding="5dp"
android:layout_height="wrap_content"
android:layout_below="@+id/listme"
android:id="@+id/text_show"
android:text="START SERVER"
/>
RelativeLayout>
2.list_view.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/text_name"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/text_value"/>
LinearLayout>运行结果
1. 运行初始界面，点击Button开启服务
2.模拟器虚拟位置信息
3.运行结果
最后，编写过程遇到的坑，由于IntentService的特点
Intent intent = new Intent(MainActivity.this,LocationListenerService.class);
startService(intent);当服务执行完全部操作后会销毁这个服务对象。
会导致程序出现以下Warming
04-13 03:14:38.058 1469-1480/com.example.a15082.locationtest W/MessageQueue: Handler (android.location.LocationManager$ListenerTransport$1) {536d20b0} sending message to a Handler on a dead thread
java.lang.RuntimeException: Handler (android.location.LocationManager$ListenerTransport$1) {536d20b0} sending message to a Handler on a dead thread
at android.os.MessageQueue.enqueueMessage(MessageQueue.java:294)
at android.os.Handler.sendMessageAtTime(Handler.java:473)
at android.os.Handler.sendMessageDelayed(Handler.java:446)
at android.os.Handler.sendMessage(Handler.java:383)
at android.location.LocationManager$ListenerTransport.onLocationChanged(LocationManager.java:200)
at android.location.ILocationListener$Stub.onTransact(ILocationListener.java:58)
at android.os.Binder.execTransact(Binder.java:367)
at dalvik.system.NativeStart.run(Native Method)解决办法
重写Intenservice 中的onStartCommand（）
@Override
public int onStartCommand( Intent intent, int flags, int startId) {
Log.i(TAG, "onStartCommand");
//添加这条语句改变startId的值
startId=START_NOT_STICKY;
return super.onStartCommand(intent, flags, startId);
}