您可以使用以下代码。使用下面的代码，它会要求打开 GPS。
public class Activity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener, LocationListener {
private final static int PLAY_SERVICES_RESOLUTION_REQUEST = 1000;
private Location mLastLocation;
// Google client to interact with Google API
private GoogleApiClient mGoogleApiClient;
// boolean flag to toggle periodic location updates
private boolean mRequestingLocationUpdates = false;
private LocationRequest mLocationRequest;
// Location updates intervals in sec
private static int UPDATE_INTERVAL = 600000; // 10 min
private static int FATEST_INTERVAL = 600000; // 10 min
private static int DISPLACEMENT = 5; // 5 meters
PendingResult<LocationSettingsResult> result;
AlertDialog.Builder alertDialogBuilder;
LinearLayout parent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
alertDialogBuilder = new AlertDialog.Builder(Activity.this);
parent = new LinearLayout(ActivitySetting.this);
parent.setGravity(Gravity.CENTER);
parent.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT));
alertDialogBuilder.setTitle("name");
// First we need to check availability of play services
if (checkPlayServices()) {
// Building the GoogleApi client
buildGoogleApiClient();
createLocationRequest();
}
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
.addLocationRequest(mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY));
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();
// final LocationSettingsStates locationSettingsStates = result.getLocationSettingsStates();
switch (status.getStatusCode()) {
case LocationSettingsStatusCodes.SUCCESS:
break;
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
alertDialogBuilder.setMessage("Turn On GPS");
alertDialogBuilder.setView(parent);
alertDialogBuilder.setCancelable(false);
alertDialogBuilder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
try {
// Show the dialog by calling startResolutionForResult(),
// and check the result in onActivityResult().
status.startResolutionForResult(ActivitySetting.this, 1000);
} catch (IntentSender.SendIntentException e) {
// check error.
}
}
});
alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
try {
// Show the dialog by calling startResolutionForResult(),
finish();
} catch (Exception e) {
// check error.
}
}
});
alertDialogBuilder.create();
alertDialogBuilder.show();
break;
case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
// you can do here what ever you want.
break;
}
}
});
}
@Override
protected void onStart() {
super.onStart();
if (mGoogleApiClient != null) {
mGoogleApiClient.connect();
}
}
@Override
protected void onResume() {
super.onResume();
checkPlayServices();
// Resuming the periodic location updates
if (mGoogleApiClient.isConnected() && mRequestingLocationUpdates) {
startLocationUpdates();
}
}
/**
* Creating google api client object
*/
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API).build();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
//final LocationSettingsStates states = LocationSettingsStates.fromIntent(data);
switch (requestCode) {
case 1000:
switch (resultCode) {
case Activity.RESULT_OK:
// If user has active gps you will get it here
break;
case Activity.RESULT_CANCELED:
// The user was asked to change settings, but chose not to turn on
break;
default:
break;
}
break;
}
}
/**
* Method to verify google play services on the device
*/
private boolean checkPlayServices() {
int resultCode = GooglePlayServicesUtil
.isGooglePlayServicesAvailable(this);
if (resultCode != ConnectionResult.SUCCESS) {
if (GooglePlayServicesUtil.isUserRecoverableError(resultCode)) {
GooglePlayServicesUtil.getErrorDialog(resultCode, this,
PLAY_SERVICES_RESOLUTION_REQUEST).show();
} else {
Toast.makeText(getApplicationContext(),
"This device is not supported.", Toast.LENGTH_LONG)
.show();
finish();
}
return false;
}
return true;
}
/**
* Google api callback methods
*/
@Override
public void onConnectionFailed(ConnectionResult result) {
Log.i("fsAil", "Connection failed: ConnectionResult.getErrorCode() = "
+ result.getErrorCode());
}
@Override
public void onConnected(Bundle arg0) {
}
@Override
public void onConnectionSuspended(int arg0) {
mGoogleApiClient.connect();
}
@Override
public void onLocationChanged(Location location) {
}
}
这里API <= 21 gps 权限将被自动授予（如果您已在清单上定义权限），对于棉花糖及以上您需要请求运行时权限（也在清单中添加权限）但在permission granted 之后打开 GPS你可以使用上面的代码。
使用此代码会出现一个警报框并要求打开 GPS（如果未激活）。所以你可以直接用上面的代码打开GPS。
希望对您有所帮助。
干杯！！