我正在创建一个位置应用程序我在第一步卡住了，我无法在地图上获取当前位置。我已经编写了代码，我不明白我做了什么错误。
我的代码如下所示：
public class MainActivity extends FragmentActivity implements LocationListener, GoogleMap.OnMarkerClickListener {
GoogleMap mGoogleMap;
List<LatLng> routePoints;
String[] mPlaceType = null;
String[] mPlaceTypeName = null;
private ArrayList<LatLng> arrayPoints = null;
private LocationRequest mLocationRequest;
private static final long INTERVAL = 5000; //one second
private static final long FASTEST_INTERVAL = 5000; // one second
private static final float SMALLEST_DISPLACEMENT = 0.01F; //one tenth of a meter
double mLatitude = 0, selectedLatitude = 0, sourceLatitude = 0, sourceLongitude = 0;
double mLongitude = 0, selectedLongitude = 0;
private boolean isPermissionRequest = false;
private static final int MY_PERMISSIONS_REQUEST_READ_PHONE_STATE = 1;
private ArrayList<LatLng> points; //added
LocationManager locationManager;
String provider;
Polyline line; //added
String url;
HashMap<String, String> mMarkerPlaceLink = new HashMap<String, String>();
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;
protected void createLocationRequest() {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(INTERVAL);
mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
mLocationRequest.setSmallestDisplacement(SMALLEST_DISPLACEMENT); //added
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
points = new ArrayList<LatLng>(); //added
createLocationRequest();
// Getting Google Play availability status
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());
if (status != ConnectionResult.SUCCESS) { // Google Play Services are not available
int requestCode = 10;
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
dialog.show();
} else { // Google Play Services are available
// Getting reference to the SupportMapFragment
SupportMapFragment fragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
// Getting Google Map
mGoogleMap = fragment.getMap();
}
if (!isAllPermissionAvailable(this) && isGreaterThanLollipop()) {
isPermissionRequest = true;
requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_READ_PHONE_STATE);
Log.v("My Application", "RequestPermissions Inside");
// return;
}
client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions,
int[] grantResults) {
if (requestCode == MY_PERMISSIONS_REQUEST_READ_PHONE_STATE) {
Log.v("My Application", "onRequestPermissionsResult");
isPermissionRequest = false;
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// Enabling MyLocation in Google Map
mGoogleMap.setMyLocationEnabled(true);
mGoogleMap.getUiSettings().setZoomControlsEnabled(true);
mGoogleMap.getUiSettings().setZoomGesturesEnabled(true);
mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(mLatitude, mLongitude), 14.0f));
// Getting LocationManager object from System Service LOCATION_SERVICE
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Getting the name of the best provider
provider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(provider);
if (location != null) {
onLocationChanged(location);
}
locationManager.requestLocationUpdates(provider, 20000, 0, this);
}
}
}
@Override
public void onLocationChanged(Location location) {
mLatitude = location.getLatitude();
mLongitude = location.getLongitude();
LatLng latLng = new LatLng(mLatitude, mLongitude);
sourceLatitude = mLatitude;
sourceLongitude = mLongitude;
Log.d("iFocus", "The value of sourceLatitude and sourceLongitude is " + sourceLatitude + " " + sourceLongitude);
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(mLatitude, mLongitude), 14.0f));
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
}
我的清单文件如下所示：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="tracker.osm.com.osmtracker">
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<permission
android:name="tracker.osm.com.osmtracker.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-permission android:name="tracker.osm.com.osmtracker.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
</activity>
<!-- ATTENTION: This was auto-generated to add Google Play services to your project for
App Indexing. See https://g.co/AppIndexing/AndroidStudio for more information. -->
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyCd91rJroX1GkHOEg5_SnEq5j23Zwl707M" />
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
</application>
</manifest>
任何人都可以让我知道我的错误，我需要做些什么改变来克服我的问题。欢迎提出所有建议。