没有打开位置不显示当前位置在android

Question

Hi在下面的代码中，我正在为我的应用程序设置当前位置。如果手动打开位置，则显示当前位置。

如果我不打开它，它在我的地图上什么都没有显示。

但我想显示打开位置的权限，并且已经编写了代码，但它不起作用。

谁能帮忙解决这个问题吗。

MapsActivity.java：

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {
private static final int LOCATION_REQUESTOR = 101;
@Bind(R.id.back)
TextView mBack;
@Bind(R.id.location)
TextView mLocation;
@Bind(R.id.toolBar)
Toolbar mToolBar;
@Bind(R.id.map_address)
TextView mMapAddress;
@Bind(R.id.latitude)
EditText mLatitude;
@Bind(R.id.longitude)
EditText mLongitude;
@Bind(R.id.setLocation)
Button mSetLocation;
private Location mLastLocation;
private GoogleMap mMap;
Marker mCurrLocationMarker;
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
private SharedPreferences mPref;
private SolarBLEPacket mSolarController = new SolarBLEPacket();
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
ButterKnife.bind(this);
mPref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
final SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
@Override
public void onConnected(@Nullable Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
@Override
public void onLocationChanged(Location location) {
mLastLocation = location;
if (mCurrLocationMarker != null) {
mCurrLocationMarker.remove();
}
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("Current Position");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
mCurrLocationMarker = mMap.addMarker(markerOptions);
//move map camera
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng,11));
mLongitude.setText(latLng.longitude + "");
mLatitude.setText(latLng.latitude + "");
}
@Override
public void onMapReady(GoogleMap googleMap)
{
mMap=googleMap;
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
//Initialize Google Play Services
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
//Location Permission already granted
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
} else {
//Request Location Permission
checkLocationPermission();
}
}
else {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
}
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
public boolean checkLocationPermission() {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
new AlertDialog.Builder(this)
.setTitle(R.string.title_location_permission)
.setMessage(R.string.text_location_permission)
.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(MapsActivity.this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
}
})
.create()
.show();

} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
}
return false;
} else {
return true;
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// location-related task you need to do.
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
//Request location updates:
//.requestLocationUpdates(provider, 400, 1, this);
}
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
}
return;
}
}
}
@OnClick(R.id.setLocation)
public void onClick() {
Intent intent = new Intent();
String longtitude = mLongitude.getText().toString();
if (!TextUtils.isEmpty(longtitude)) {
intent.putExtra(Constants.LONGITUDE, longtitude);
} else {
Toast.makeText(this, R.string.please_enter_longitude, Toast.LENGTH_SHORT).show();
return;
}
String latitude = mLatitude.getText().toString();
if (!TextUtils.isEmpty(latitude)) {
intent.putExtra(Constants.LATITUDE, latitude);
} else {
Toast.makeText(this, R.string.please_enter_latitude, Toast.LENGTH_SHORT).show();
return;
}
String latCommand = mSolarController.generatePacket("lat " +latitude,"00");
String longitudeCmd = mSolarController.generatePacket("lon "+longtitude,"00");
mPref.edit().putString(Constants.LAT_COMMAND,latCommand).commit();
mPref.edit().putString(Constants.LONG_COMMAND,longitudeCmd).commit();
mPref.edit().putString(Constants.LAST_LATITUDE,latitude).commit();
mPref.edit().putString(Constants.LAST_LONGITUDE,latitude).commit();
setResult(RESULT_OK, intent);
finish();
}
@OnClick({R.id.back, R.id.location})
public void onClick(View view) {
switch (view.getId()) {
case R.id.back:
setResult(RESULT_OK, new Intent());
finish();
break;
case R.id.location:
Intent intent = new Intent();
String longtitude = mLongitude.getText().toString();
if (!TextUtils.isEmpty(longtitude)) {
intent.putExtra(Constants.LONGITUDE, longtitude);
} else {
Toast.makeText(this, R.string.please_enter_longitude, Toast.LENGTH_SHORT).show();
return;
}
String latitude = mLatitude.getText().toString();
if (!TextUtils.isEmpty(latitude)) {
intent.putExtra(Constants.LATITUDE, latitude);
} else {
Toast.makeText(this, R.string.please_enter_latitude, Toast.LENGTH_SHORT).show();
return;
}
Float lat = Float.parseFloat(latitude);
if (lat > 90 || lat < -90) {
Toast.makeText(this, R.string.longitude_alert, Toast.LENGTH_SHORT).show();
return;
}
float lan = Float.parseFloat(longtitude);
if (lan > 180 || lan < -180) {
Toast.makeText(this, R.string.latitude_alert, Toast.LENGTH_SHORT).show();
return;
}
String latCommand = mSolarController.generatePacket("lat "+latitude,"00");
String longitudeCmd = mSolarController.generatePacket("long "+longtitude,"00");
mPref.edit().putString(Constants.LAT_COMMAND,latCommand).commit();
mPref.edit().putString(Constants.LONG_COMMAND,longitudeCmd).commit();
mPref.edit().putString(Constants.LAST_LATITUDE,latitude).commit();
mPref.edit().putString(Constants.LAST_LONGITUDE,latitude).commit();
setResult(RESULT_OK, intent);
finish();
break;
}
}
}

Answer 1

您只是在检查权限，您需要检查设备的位置是否启用。

LocationManager lm = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
boolean gps_enabled = false;
boolean network_enabled = false;
try {
gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
} catch(Exception ex) {}
try {
network_enabled = lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
} catch(Exception ex) {}
if(!gps_enabled && !network_enabled) {
// notify user
AlertDialog.Builder dialog = new AlertDialog.Builder(context);
dialog.setMessage(context.getResources().getString(R.string.gps_network_not_enabled));
dialog.setPositiveButton(context.getResources().getString(R.string.open_location_settings), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface paramDialogInterface, int paramInt) {
// TODO Auto-generated method stub
Intent myIntent = new Intent( Settings.ACTION_LOCATION_SOURCE_SETTINGS);
context.startActivity(myIntent);
//get gps
}
});
dialog.setNegativeButton(context.getString(R.string.Cancel), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface paramDialogInterface, int paramInt) {
// TODO Auto-generated method stub
}
});
dialog.show();      
}