如何要求用户在应用程序启动时启用GPS？

Question

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);
}
}

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.

我希望API级别>=19。

请帮助我解决我的问题..........谢谢

Answer 1

如果你想要下图所示的东西，请跟随。

>

在应用程序中添加以下依赖项build.gradle

  implementation 'com.google.android.gms:play-services-location:16.0.0'

创建您想要的位置请求类型，我们想要GPS的高精度

  LocationRequest locationRequest = LocationRequest.create();
  locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
  LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
                .addLocationRequest(locationRequest);

Task<LocationSettingsResponse> result =
                LocationServices.getSettingsClient(getActivity()).checkLocationSettings(builder.build());



result.addOnCompleteListener(new OnCompleteListener<LocationSettingsResponse>() {
            @Override
            public void onComplete(@NonNull Task<LocationSettingsResponse> task) {
                try {
                    LocationSettingsResponse response = task.getResult(ApiException.class);
                    // All location settings are satisfied. The client can initialize location
                    // requests here.
                } catch (ApiException exception) {
                    switch (exception.getStatusCode()) {
                        case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
                            // Location settings are not satisfied. But could be fixed by showing the
                            // user a dialog.
                            try {
                                // Cast to a resolvable exception.
                                ResolvableApiException resolvable = (ResolvableApiException) exception;
                                // Show the dialog by calling startResolutionForResult(),
                                // and check the result in onActivityResult().
                                resolvable.startResolutionForResult(
                                        getActivity(),
                                        LocationRequest.PRIORITY_HIGH_ACCURACY);
                            } catch (IntentSender.SendIntentException e) {
                                // Ignore the error.
                            } catch (ClassCastException e) {
                                // Ignore, should be an impossible 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 onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
    case LocationRequest.PRIORITY_HIGH_ACCURACY:
        switch (resultCode) {
            case Activity.RESULT_OK:
                // All required changes were successfully made
                Log.i(TAG, "onActivityResult: GPS Enabled by user");
                break;
            case Activity.RESULT_CANCELED:
                // The user was asked to change settings, but chose not to
                Log.i(TAG, "onActivityResult: User rejected GPS request");
                break;
            default:
                break;
        }
        break;
    } 
}