How to ask user to enable GPS at the launch of app

问题:

private void turnGPSOn(){
String provider = Settings.Secure.getString(getContentResolver(), Settings.Secure.LOCATION_PROVIDERS_ALLOWED);

if(!provider.contains("gps")){ //if gps is disabled
    final Intent poke = new Intent();
    poke.setClassName("com.android.settings", "com.android.settings.widget.SettingsAppWidgetProvider"); 
    poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
    poke.setData(Uri.parse("3")); 
    sendBroadcast(poke);
}
}

see the Logcat

04/20 17:35:26: Launching app
$ adb push F:\AndroidProject\Picker\app\build\outputs\apk\app-debug.apk /data/local/tmp/picker.novasyslabs.com.picker
$ adb shell pm install -r "/data/local/tmp/picker.novasyslabs.com.picker"
    pkg: /data/local/tmp/picker.novasyslabs.com.picker
Success


$ adb shell am start -n "picker.novasyslabs.com.picker/picker.novasyslabs.com.picker.SlashScreen" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Connected to process 22502 on device sony-d2302-ZH80065A89
W/ResourceType: Found multiple library tables, ignoring...
W/ResourceType: Found multiple library tables, ignoring...
W/ResourceType: Found multiple library tables, ignoring...
W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
I/art: Background partial concurrent mark sweep GC freed 151(19KB) AllocSpace objects, 0(0B) LOS objects, 39% free, 13MB/22MB, paused 5.156ms total 20.919ms
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: picker.novasyslabs.com.picker, PID: 22502
                  java.lang.RuntimeException: Unable to start activity ComponentInfo{picker.novasyslabs.com.picker/picker.novasyslabs.com.picker.SlashScreen}: java.lang.ClassCastException: picker.novasyslabs.com.picker.SlashScreen cannot be cast to com.google.android.gms.common.api.GoogleApiClient$ConnectionCallbacks
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379)
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442)
                      at android.app.ActivityThread.access$800(ActivityThread.java:156)
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351)
                      at android.os.Handler.dispatchMessage(Handler.java:102)
                      at android.os.Looper.loop(Looper.java:211)
                      at android.app.ActivityThread.main(ActivityThread.java:5371)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at java.lang.reflect.Method.invoke(Method.java:372)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:945)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:740)
                   Caused by: java.lang.ClassCastException: picker.novasyslabs.com.picker.SlashScreen cannot be cast to com.google.android.gms.common.api.GoogleApiClient$ConnectionCallbacks
                      at picker.novasyslabs.com.picker.SlashScreen.onCreate(SlashScreen.java:65)
                      at android.app.Activity.performCreate(Activity.java:5990)
                      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2332)
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442) 
                      at android.app.ActivityThread.access$800(ActivityThread.java:156) 
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351) 
                      at android.os.Handler.dispatchMessage(Handler.java:102) 
                      at android.os.Looper.loop(Looper.java:211) 
                      at android.app.ActivityThread.main(ActivityThread.java:5371) 
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at java.lang.reflect.Method.invoke(Method.java:372) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:945) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:740) 
Application terminated.

I tried many other option like package manager, location manager, etc but not able to do what I want. I want that at the launch application user will be prompted to enable the GPS. I don't want user to go inside the settings.

And that I wanted for the API level >=19.

Please help me to solve my problem......... Thanks

回答1:

 GoogleApiClient googleApiClient = new GoogleApiClient.Builder(context)
            .addApi(LocationServices.API)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this).build();
    googleApiClient.connect();

    LocationRequest locationRequest = LocationRequest.create();
    locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    locationRequest.setInterval(5 * 1000);
    locationRequest.setFastestInterval(2 * 1000);
    LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
            .addLocationRequest(locationRequest);

    //**************************
    builder.setAlwaysShow(true); //this is the key ingredient
    //**************************

    PendingResult<LocationSettingsResult> result =
            LocationServices.SettingsApi.checkLocationSettings(googleApiClient, builder.build());
    result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
        @Override
        public void onResult(@NonNull LocationSettingsResult result) {
            final Status status = result.getStatus();
//                final LocationSettingsStates state = result.getLocationSettingsStates();

            switch (status.getStatusCode()) {
                case LocationSettingsStatusCodes.SUCCESS:


                    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(
                                context, 1000);
                    } catch (IntentSender.SendIntentException e) {
                        // Ignore the error.
                    }
                    break;
                case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
                    break;
            }
        }
    });

回答2:

use SettingsApi if you not want to force user to go settings page to enable gps. here the link of how to use SettingsApi SettingsApi

回答3:

public void showSettingAlert()
    {
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(context);
        alertDialog.setTitle("GPS setting!");
        alertDialog.setMessage("GPS is not enabled, Do you want to go to settings menu? ");
        alertDialog.setPositiveButton("Setting", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                context.startActivity(intent);
            }
        });
        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });
        alertDialog.show();
    }