Android 獲取經緯度的服務
使用原生Android API 編寫一個Service類獲取經緯度信息(本文僅作爲學習筆記來使用，若侵犯到您的權益，請及時與我聯繫，我會刪除涉及侵犯到您的內容)。
一， 實現步驟
- 添加對應的權限
- 編寫Service類實現獲取經緯度的功能
- 將獲取的經緯度使用廣播傳遞到MainAtivity做數據的展示
- 踩過的坑
二，代碼實現
1).在AndroidManifest.xml添加權限
<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).編寫Service類
Service繼承IntentService類，並實現了LocationListener接口，具體代碼如下
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);
// 檢查定位服務是否打開
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;
}
//設置數據更新的條件，參數分別爲1，使用GPS 2，最小時間間隔 3000毫秒 3，最短距離 100 4,設置事件監聽者 this(類繼承了Locationlistener)
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3000, 100, this);
} else {
Log.i(TAG, "無法定位");
Toast.makeText(this, "無法定位，請打開定位服務", 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, "緯度 =" + latitude);
double longitude = location.getLongitude();
Log.i(TAG, "經度 =" + longitude);
//將location作爲參數傳遞給廣播
BCL(location);
}
/**
* 將經緯度信息賦值給一個ArrayList
* @param location
* @return arraylist
*/
private ArrayList<String> getConcretMessage(Location location) {
ArrayList<String> arrayList=new ArrayList<String>();
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 ;
}
/**
* 使用廣播將經緯度等信息傳遞出去
* @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;
}
//第四個參數爲PendingIntent
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 9000, 1000, pi);
}
/**
*
* @param location
* @return 返回一個已包裝數據的PendingIntent
*/
private PendingIntent getPI(Location location) {
Intent intent = new Intent();
intent.setAction("location1");
for(int i=0;i<getConcretMessage(location).size();i++){
intent.putExtra("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類編寫完畢，將Service在AndroidManifest.xml註冊
<service android:name=".LocationListenerService">
<intent-filter>
<action android:name="locationlistener"/>
</intent-filter>
</service>4).編寫實現類，並做數據展示
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<String> nameList=new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initData();
initUI();
}
/**
* 初始化listvie數據
*/
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();
//動態註冊廣播
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("location1");
registerReceiver(bc, intentFilter);
}
//自定義 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<count;i++){
str[i]=intent.getStringExtra("DATA"+i);
}
//爲數據展示所在的listview添加一個適配器
listme.setAdapter(new MyAdapter());
}
}
//自定義數據適配器
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();
//解綁廣播接收者
unregisterReceiver(bc);
}
@Override
protected void onRestart() {
super.onRestart();
startServer();
}
/**
* 開啓服務
*/
public void startServer(){
Intent intent = new Intent(MainActivity.this,LocationListenerService.class);
startService(intent);
}
}
5),MainActivity所用到的佈局文件
1.activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<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
<?xml version="1.0" encoding="utf-8"?>
<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>運行結果
1. 運行初始界面，點擊Button開啓服務
2.模擬器虛擬位置信息
3.運行結果
最後，編寫過程遇到的坑，由於IntentService的特點
Intent intent = new Intent(MainActivity.this,LocationListenerService.class);
startService(intent);當服務執行完全部操作後會銷燬這個服務對象。
會導致程序出現以下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)解決辦法
重寫Intenservice 中的onStartCommand（）
@Override
public int onStartCommand( Intent intent, int flags, int startId) {
Log.i(TAG, "onStartCommand");
//添加這條語句改變startId的值
startId=START_NOT_STICKY;
return super.onStartCommand(intent, flags, startId);
}