[英]Get current user location or last known location
我意識到這個問題之前已經被問過很多次了,但我現在問它是因為答案很舊(與新 API 相比)。
我以前使用過位置管理器,但我發現它非常不可靠。 例如在我的應用程序中,使用 getLastKnownLocation 和/或當前位置,它會立即加載用戶當前位置的相機。 但是假設我在啟動我的應用程序之前在我的設備上打開了位置,它不會在用戶的當前位置上顯示相機,而是在 Nigera 附近的某個地方(我相信是默認視圖)。
僅當我使用 Google 地圖應用程序並固定我的位置或等待一段時間時,我的應用程序才會在視圖中加載用戶的位置(使用 moveCamera)。
有時它會起作用,有時它不會。 但是我想使用 Google Api Client 或者更流暢的東西來檢索用戶的位置。
我想這樣做:
1.) 如果用戶沒有打開他們的位置,提示他們打開它。
2.) 打開定位后,以用戶當前位置為中心啟動地圖相機/視圖。
3.) 最后,如果用戶決定離開位置或從他們的位置移動,絕對什么都不做。
我在這里閱讀了很多問題,但找不到任何可以幫助我使用 Google Api 客戶端或其他任何東西配置此功能的內容。 我已經嘗試了幾乎所有的位置管理器,但我仍然無法讓它順利工作。 出於沮喪,我刪除了我所有的位置管理器代碼。
如果你想看看我寫下或嘗試過的內容,我的大部分資料都來自這個問題(和相關的):
在 Android 上獲取用戶當前位置的最簡單、最可靠的方法是什么?
感謝您抽出時間來閱讀。
位置管理器非常適合我,但是對於 API 級別 23,您需要做一些解決方法。 獲取API級別23的權限,需要在主線程中編寫權限邏輯。
這是我在其中一個代碼中使用的示例。
/*Checking for permission if API level is more than 23 or 23, if condition match function calls*/
if (Build.VERSION.SDK_INT >= 23) {
requestMultiplePermissions();
}
/*Background Thread for splash screen with 2 seconds*/
final Thread splashScreenThread = new Thread() {
public void run() {
try {
Thread.sleep(2000);
} catch (InterruptedException exception) {
exception.printStackTrace();
} finally {
Intent homeScreen = new Intent(SplashScreen.this, MainActivity.class);
startActivity(homeScreen);
finish();
}
}
};
splashScreenThread.start();
}
/*Standar Permission chcking code for API level 23 or more*/
private void requestMultiplePermissions() {
String locationPermission = Manifest.permission.ACCESS_FINE_LOCATION;
int hasLocPermission = checkSelfPermission(locationPermission);
List<String> permissions = new ArrayList<String>();
if (hasLocPermission != PackageManager.PERMISSION_GRANTED) {
permissions.add(locationPermission);
}
if (!permissions.isEmpty()) {
String[] params = permissions.toArray(new String[permissions.size()]);
requestPermissions(params, 1);
} else {
// We already have permission, so handle as normal
}
}
/*This is function is used when permissions is granted by user, here we are firing a Intent after getting permission
* */
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions,
int[] grantResults) {
Toast.makeText(SplashScreen.this, " " + grantResults, Toast.LENGTH_SHORT).show();
switch (requestCode) {
case 1:
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Handle permission granted firing the Intent
Intent intent = new Intent(SplashScreen.this, MainActivity.class);
startActivity(intent);
finish();
} else {
// Handle permission denied, giving Alertbox to user with some text
new AlertDialog.Builder(this)
.setMessage("The app cannot continue without permissions")
.setCancelable(false)
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
SplashScreen.this.finish();
}
})
.show();
}
break;
default:
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
//
在您的 Mainactivity 或您想要的任何地方輸入上述代碼,我更願意在應用程序啟動時請求許可。
以下服務優雅地為我提供了位置服務的准確性和狀態。 在我登錄應用程序之前使用此服務,因為應用程序需要啟用定位服務。
基於此服務輸入,您可以
位置更新要記住的要點是
setSmallestDisplacement
(即使我們長時間停留在一個位置不動,API 也會取回數據)setPriority
public class AppLocationService extends Service implements GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener{
private LocationRequest locationRequest;
private GoogleApiClient googleApiClient;
private Context appContext;
private boolean currentlyProcessingLocation = false;
private int mInterval=0;
private final int CONNTIMEOUT=50000;
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
@Override
public void onCreate() {
super.onCreate();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
appContext=getBaseContext();
Toast.makeText(getBaseContext(), "Location Service Started", Toast.LENGTH_SHORT)
.show();
if(intent != null){
mInterval = intent.getIntExtra(Constants.REFRESHTIMETAG, 5);
mIMEI = intent.getStringExtra(Constants.IMEITAG);
Log.v(Constants.BLL_LOG, "AppLocationService onStartCommand , mInterval=" + mInterval + " | mIMEI=" + mIMEI);
}
if (!currentlyProcessingLocation) {
currentlyProcessingLocation = true;
startTracking();
}
return START_STICKY;
}
private void startTracking() {
Log.v(Constants.BLL_LOG, "startTracking");
if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(this) == ConnectionResult.SUCCESS) {
Log.v(Constants.BLL_LOG, "ConnectionResult SUCCESS");
googleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
if (!googleApiClient.isConnected() || !googleApiClient.isConnecting()) {
googleApiClient.connect();
Log.v(Constants.BLL_LOG, "googleApiClient.connect()");
}else{
Log.v(Constants.BLL_LOG, "NOT connected googleApiClient.connect()");
//
//INTIMATE UI WITH EITHER HANDLER OR RUNONUI THREAD
//
}
} else {
Log.v(Constants.BLL_LOG, "unable to connect to google play services.");
}
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
public AppLocationService() {
}
@Override
public void onConnected(Bundle bundle) {
Log.v(Constants.BLL_LOG, "onConnected");
locationRequest = LocationRequest.create();
locationRequest.setInterval(mInterval * 1000); // milliseconds
locationRequest.setFastestInterval(mInterval * 1000);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationRequest.setSmallestDisplacement(MIN_DISTANCE_CHANGE_FOR_UPDATES);//distance change
int permissionCheck = ContextCompat.checkSelfPermission(appContext, Manifest.permission.ACCESS_COARSE_LOCATION);
if (permissionCheck!= PackageManager.PERMISSION_DENIED)
{ LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, this);}
Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(appContext, "Location Service got connected", Toast.LENGTH_SHORT)
.show();
}
});
}
@Override
public void onConnectionSuspended(int i) {
Log.v(Constants.BLL_LOG, "onConnectionSuspended");
//INTIMATE UI ABOUT DISCONNECTION STATUS
}
@Override
public void onLocationChanged(Location location) {
Log.v(Constants.BLL_LOG, "onLocationChanged position: " + location.getLatitude() + ", " + location.getLongitude() + " accuracy: " + location.getAccuracy());
//if (location.getAccuracy() < 500.0f)
Log.v(Constants.BLL_LOG, "onLocationChanged position: location.getAccuracy()= "+location.getAccuracy());
//DO YOUR BUSINESS LOGIC, FOR ME THE SAME WAS TO SEND TO SERVER
sendLocationDataToWebsite(location);
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Log.v(Constants.BLL_LOG, "onConnectionFailed");
Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(appContext, "Location Service got disconnected temporarily", Toast.LENGTH_SHORT)
.show();
}
});
}
/**
* Send details to server
* @param location
*/
void sendLocationDataToWebsite(Location location){
}
@Override
public void onDestroy() {
super.onDestroy();
if (googleApiClient != null && googleApiClient.isConnected()) {
googleApiClient.disconnect();
}
this.unregisterReceiver(this.batteryInfoReceiver);
}
}
注意:此服務仍需要在更新版本中進行測試
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