我正在创建一个使用谷歌地图的Android应用程序，所以我需要打开GPS，我有一个飞溅活动，我试图检查GPS是否打开。问题是我可以检查GPS是打开还是关闭，但我不知道如何创建对话框，以便用户可以打开GPS。我在几个应用程序中看到，当你打开它时，它会显示一个Dialog，如果GPS应该打开，它会询问用户，如果用户选择是，GPS会自动打开。如果用户选择“否”，则关闭对话框并再次重新打开。这个过程重复进行，直到用户选择是。我怎样才能实现这样的目标呢？
这是我迄今为止所拥有的。：
public class ActividadSplash extends AppCompatActivity {
private static final long SPLASH_SCREEN_DELAY = 6000;
private ProgressBar barra;
private int progressStatus = 0;
private Handler handler = new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash_screen);
final LocationManager manager = (LocationManager)getApplicationContext().getSystemService (Context.LOCATION_SERVICE );
if(!manager.isProviderEnabled( LocationManager.GPS_PROVIDER)){
CheckEnableGPS();
}
else{
barra = (ProgressBar) findViewById(R.id.barraProgreso2);
barra.setScaleY(3f);
new Thread(new Runnable() {
public void run() {
while (progressStatus < 100) {
progressStatus += 1;
//Update progress bar with completion of operation
handler.post(new Runnable() {
public void run() {
barra.setProgress(progressStatus);
if(progressStatus==100){
finish();
ParseUser usuario= ParseUser.getCurrentUser();
if(usuario!=null){
Intent intento = new Intent(getApplicationContext(), DrawerPrincipal.class);
intento.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intento.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intento);
}else{
Intent intento = new Intent(getApplicationContext(), ActividadLogin.class);
intento.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intento.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intento);
}
}
// textView.setText(progressStatus+"/"+progressBar.getMax());
}
});
try {
// Sleep for 200 milliseconds.
//Just to display the progress slowly
Thread.sleep(20);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
}
}
private void CheckEnableGPS() {
String provider = Settings.Secure.getString(getContentResolver(),
Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
if(!provider.equals("")){
//GPS Enabled
}else{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Enable GPS"); // GPS not found
builder.setMessage("The app needs GPS to be enabled do you want to enable it in the settings? "); // Want to enable?
builder.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogInterface, int i) {
startActivity(new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
}
});
builder.setNegativeButton("Exit", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogInterface, int i) {
finish();
}
});
builder.setCancelable(false);
builder.create().show();
return;
}
}
}
答案 0 :(得分：3)
private void showGpsDialogAndGetLocation() {
mGoogleApiClient = new GoogleApiClient.Builder(LoginActivity.this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
//initialize the builder and add location request paramenter like HIGH Aurracy
locationRequest = LocationRequest.create()
.setInterval(10 * 60 * 1000) // every 10 minutes
.setExpirationDuration(10 * 1000) // After 10 seconds
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
builder = new LocationSettingsRequest.Builder()
.addLocationRequest(locationRequest);
// set builder to always true (Shows the dialog after never operation too)
builder.setAlwaysShow(true);
// Then check whether current location settings are satisfied:
PendingResult<LocationSettingsResult> result = LocationServices.SettingsApi.checkLocationSettings(mGoogleApiClient, builder.build());
result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
@Override
public void onResult(LocationSettingsResult result) {
final Status status = result.getStatus();
final LocationSettingsStates locationSettingsStates = result.getLocationSettingsStates();
switch (status.getStatusCode()) {
case LocationSettingsStatusCodes.SUCCESS:
// All location settings are satisfied. The client can initialize location
// requests here.
getLocationAndSaveInDatabase();
break;
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
// Location settings are not satisfied. But could be fixed by showing the user
// a dialog.
try {
// Show the dialog by calling startResolutionForResult(),
// and check the result in onActivityResult().
status.startResolutionForResult(
LoginActivity.this,
REQUEST_CHECK_SETTINGS);
} catch (IntentSender.SendIntentException e) {
// Ignore the error.
}
break;
case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
// Location settings are not satisfied. However, we have no way to fix the
// settings so we won't show the dialog.
break;
}
}
});
}
@Override
public void onLocationChanged(Location location) {
if (location != null) {
double latitude = location.getLatitude();
double longitude = location.getLongitude();
insertLocationCoordinatesInDatabase(latitude, longitude);
}
}
@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 onConnected(@Nullable Bundle bundle) {
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
**Implement These Interfaces in class**
implements LocationListener, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener