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我正在開發一個簡單的GPS應用程序，但我在德'GPS'提供商有一些麻煩。OnLocationChanged從來沒有打電話時，GPS是供應商
問題是，當我從'gps'提供者請求更新時，onLocationChanged永遠不會被調用。我已經授予了所需的所有權限，並且已經測試了「gps」提供程序已啓用。我已經在2種不同的手機上進行了測試，並且兩種手機都無法正常工作（所以問題不能成爲我的智能手機的GPS）。此外，如果我更改提供程序並使用'網絡'之一，它可以使用相同的代碼，也就是說，定期調用onLocationChanged。
這裏是我的代碼：
public class Capturador extends Activity implements SurfaceHolder.Callback, SensorEventListener, LocationListener {
boolean lockLocalizacion = false;
private static final long TIEMPO_MIN = 0;//10 * 1000; // 10 segundos
private static final long DISTANCIA_MIN = 0;//5; // 5 metros
private LocationManager manejador;
private String gpsLatActual;
private String gpsLongActual;
private String gpsAltActual;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFormat(PixelFormat.TRANSPARENT);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.primeracapa);
manejador = (LocationManager) getSystemService(LOCATION_SERVICE);
Location localizacion = getLastKnownLocation();
txtGPS = (TextView) findViewById(R.id.localizacionEdit);
if (localizacion == null) {
txtGPS.setText(R.string.loc_unknown);
gpsLatActual = "";
gpsLongActual = "";
gpsAltActual = "";
} else {
txtGPS.setText("(" + Double.toString(localizacion.getLongitude()) + ", " + Double.toString(localizacion.getLatitude()) + ", "
+ Double.toString(localizacion.getAltitude()) + ")");
gpsLatActual = Double.toString(localizacion.getLatitude());
gpsLongActual = Double.toString(localizacion.getLongitude());
gpsAltActual = Double.toString(localizacion.getAltitude());
lockLocalizacion = true;
}
}
private Location getLastKnownLocation() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
|| ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
manejador = (LocationManager) getApplicationContext().getSystemService(LOCATION_SERVICE);
List<String> providers = manejador.getProviders(true);
Location bestLocation = null;
for (String provider : providers) {
Location l = manejador.getLastKnownLocation(provider);
if (l == null) {
continue;
}
if (bestLocation == null || l.getAccuracy() < bestLocation.getAccuracy()) {
// Found best last known location: %s", l);
bestLocation = l;
}
}
return bestLocation;
}
else return null;
}
@Override
protected void onResume() {
super.onResume();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
Criteria crit = new Criteria();
crit.setAccuracy(Criteria.ACCURACY_FINE);
String best = manejador.getBestProvider(crit, true); //best is always gps (LocationManager.GPS_PROVIDER)
manejador.requestLocationUpdates(best, 0, 1, this); //writting LocationManager.NETWORK_PROVIDER insted of 'best' does work
}
}
@Override
protected void onPause() {
super.onPause();
try {
manejador.removeUpdates(this);
} catch (SecurityException e) {
e.printStackTrace();
}
}
@Override
public void onLocationChanged(Location location) {
if (location == null) {
txtGPS.setText(R.string.loc_desconocida);
lockLocalizacion = false;
} else {
txtGPS.setText("(" + Double.toString(location.getLatitude()) + ", " + Double.toString(location.getLongitude()) + ", "
+ Double.toString(location.getAltitude()) + ")");
gpsLatActual = Double.toString(location.getLatitude());
gpsLongActual = Double.toString(location.getLongitude());
gpsAltActual = Double.toString(location.getAltitude());
lockLocalizacion = true;
}
}
@Override
public void onProviderDisabled(String proveedor) {
}
@Override
public void onProviderEnabled(String proveedor) {
}
@Override
public void onStatusChanged(String proveedor, int estado, Bundle extras) {
}
}
而且清單：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.project"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-feature android:name="android.hardware.location.gps" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:screenOrientation="landscape"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="Capturador"
android:screenOrientation="landscape">
</activity>
<activity
android:name="Visualizador"
android:screenOrientation="landscape">
</activity>
<activity android:name="Ajustador" android:screenOrientation="landscape"/>
<activity android:name="Visualizador2" android:screenOrientation="landscape"/>
</application>
你能告訴我們你的清單的其餘部分嗎？ – user1506104
你在室內測試嗎？ GPS在這種情況下可能會遇到問題。 –
有清單。是的，我正在室內進行測試，我會嘗試在室外進行測試，這可能是問題所在。無論如何，我啓動了Google地圖，它知道我的位置，但我的應用沒有。 Google地圖是否僅使用GPS提供商或取決於可用的GPS提供商？ – JOSEMAFUEN