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我已经使用 FusedLocationProviderClient 实现了定位。我的应用程序中的问题是权限对话框没有打开设置中的位置。在开始获取更新之前，我必须手动打开它。

我已经使用ContextCompat and ActivityCompat类检查并请求了权限，但在我手动按下按钮之前什么都没有发生。FusedLocationProviderClient这是我这边的错误还是糟糕的编程？我使用过location manager and Fused Location ProviderAPI，以前从未遇到过这种情况。

这是我的代码：

public class HomeFragment extends BaseFragment implements OnMapReadyCallback {

private static final String TAG = HomeFragment.class.getSimpleName();

private Toolbar toolbar;
private TextView driverStatusTV;

public static MaterialAnimatedSwitch statusSwitch;

private FusedLocationProviderClient providerClient;
public static Location mLastLocation;
public static LocationRequest locationRequest;
public GoogleMap mGmap;

public static Marker currentMarker;
public static double latitude = 0f, longitude = 0f;
private static boolean isLocationGranted = false;

public static final int UPDATE_INTERVAL = 15000;
public static final int FASTEST_INTERVAL = 8000;
public static final int DISPLACEMENT = 10;

public static final int PLAY_SERVICES_REQ_CODE = 9009;
public static final int PLAY_SERVICES_RESOLUTION_REQ_CODE = 9090;

private SupportMapFragment mapFragment;

public HomeFragment() {
    // Required empty public constructor
}

private void initViews(View view) {
    toolbar = view.findViewById(R.id.toolbar);
    driverStatusTV = view.findViewById(R.id.driverStatusTV);
    statusSwitch = view.findViewById(R.id.statusSwitch);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_home, container, false);
    initViews(view);
    ((AppCompatActivity) getActivity()).setSupportActionBar(toolbar);

    checkPerms();
    providerClient = LocationServices.getFusedLocationProviderClient(getActivity());
    mapFragment = (SupportMapFragment) this.getChildFragmentManager().findFragmentById(R.id.mapFragment);
    mapFragment.getMapAsync(this);

    driverStatusTV.setText("OFFLINE");
    statusSwitch.setOnCheckedChangeListener(new MaterialAnimatedSwitch.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(boolean b) {
            if (b) {
                Snackbar.make(getActivity().findViewById(android.R.id.content), "You are Now Online", Snackbar.LENGTH_LONG).show();
                if (checkPerms()) {
                    startLocationListener();
                    driverStatusTV.setText("ONLINE");
                }
            } else {
                Snackbar.make(getActivity().findViewById(android.R.id.content), "You are Now Offline", Snackbar.LENGTH_LONG).show();
                mGmap.setIndoorEnabled(false);
                if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                    return;
                }
                mGmap.setMyLocationEnabled(false);
                stopLocationListener();
                driverStatusTV.setText("OFFLINE");
                if (currentMarker != null){
                    currentMarker.remove();
                }
            }
        }
    });

    return view;
}

private void stopLocationListener() {
    if (providerClient != null){
        providerClient.removeLocationUpdates(locationCallback);
    }
}

@Override
public void onPause() {
    super.onPause();
    stopLocationListener();
}

private void startLocationListener() {
    locationRequest = LocationRequest.create();
    locationRequest.setSmallestDisplacement(DISPLACEMENT);
    locationRequest.setFastestInterval(FASTEST_INTERVAL);
    locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    locationRequest.setInterval(UPDATE_INTERVAL);

    LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder();
    builder.addLocationRequest(locationRequest);

    LocationSettingsRequest settingsRequest = builder.build();

    SettingsClient client = LocationServices.getSettingsClient(getActivity());
    client.checkLocationSettings(settingsRequest);

    displayLocation();

}

private boolean checkPerms() {
    if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        reqPerms();
        isLocationGranted = false;
        Log.d(TAG, "Permission Value:\t" + isLocationGranted);
    } else {
        isLocationGranted = true;
        Log.d(TAG, "Permission Value:\t" + isLocationGranted);
    }
    return isLocationGranted;
}

private void reqPerms() {
    ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, AppConstants.LOC_PERM_CODE);
}

private void displayLocation() {
    if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        reqPerms();
    } else {
        if (statusSwitch.isChecked()) {
            providerClient.requestLocationUpdates(locationRequest, locationCallback, Looper.myLooper());
            mGmap.setIndoorEnabled(true);
            mGmap.setMyLocationEnabled(true);
        } else {
            mGmap.setIndoorEnabled(false);
            mGmap.setMyLocationEnabled(false);
        }
    }
}

private LocationCallback locationCallback = new LocationCallback() {
    @Override
    public void onLocationResult(LocationResult locationResult) {

        Location location = locationResult.getLastLocation();
        mLastLocation = location;
        if (currentMarker != null) {
            currentMarker.remove();
        }
        latitude = mLastLocation.getLatitude();
        Log.d(TAG, "Lat:\t" + latitude);
        longitude = mLastLocation.getLongitude();
        Log.d(TAG, "Long:\t" + longitude);

        MarkerOptions options = new MarkerOptions();
        options.position(new LatLng(latitude, longitude));
        options.title("Driver");
        //options.icon(BitmapDescriptorFactory.fromResource(R.drawable.car)); // throws error

        currentMarker = mGmap.addMarker(options);
        rotateMarker(currentMarker, 360, mGmap);
        mGmap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(latitude,longitude), 18.0f));

    }
};

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode) {
        case AppConstants.LOC_PERM_CODE:
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                isLocationGranted = true;
                if (checkPlayServices() && statusSwitch.isChecked()) {
                    startLocationListener();
                } else {
                    Snackbar.make(getActivity().findViewById(android.R.id.content), "Google Play Services Not Supported on Your Device", Snackbar.LENGTH_LONG).show();
                }
            }
            break;
    }
}

public boolean checkPlayServices() {
    int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getActivity());
    if (resultCode != ConnectionResult.SUCCESS) {
        if (GooglePlayServicesUtil.isUserRecoverableError(resultCode)) {
            GooglePlayServicesUtil.getErrorDialog(resultCode, getActivity(), AppConstants.PLAY_SERVICES_RESOLUTION_REQUEST).show();
        } else {
            Snackbar.make(getActivity().findViewById(android.R.id.content), "Play Services NOT Supported on Your Device", Snackbar.LENGTH_LONG).show();
            getActivity().finish();
            getActivity().moveTaskToBack(true);
        }
        return false;
    }
    return true;
}

private void rotateMarker(final Marker currentMarker, final float i, GoogleMap mGmap) {
    final Handler handler = new Handler();
    final long start = SystemClock.uptimeMillis();
    final float startRotation = currentMarker.getRotation();
    final int duration = 1500;

    final Interpolator interpolator = new LinearInterpolator();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            long elapsed = SystemClock.elapsedRealtime() - start;
            float t = interpolator.getInterpolation(elapsed / duration);
            float rot = t * i + (1 - t) * startRotation;
            currentMarker.setRotation(-rot > 180 ? rot / 2 : rot);

            if (t < 1.0) {
                handler.postDelayed(this, 16);
            }

        }
    }, duration);
}

@Override
public void onMapReady(GoogleMap googleMap) {
    mGmap = googleMap;

    startLocationListener();

}

}

Alos，标记上的设置图标引发此错误com.google.maps.api.android.lib6.common.apiexception.b: Failed to decode image. The provided image must be a Bitmap.

谁能帮我解决这两个问题？谢谢

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1 回答 1

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您的 onRequestPermissionsResult 将永远不会被调用，您正在从您的活动中请求权限，并且您的活动的 onRequestPermissionsResult 将被调用。如果您想要片段中的权限回调，只需在请求权限时删除 Activity

private void reqPerms() {
   requestPermissions(getActivity(), new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, AppConstants.LOC_PERM_CODE);
}

如果要访问此方法，您的片段必须是 supportFragment

于 2018-05-31T22:40:49.343 回答