如何在android studio 6.0运行时权限下使用地图活动获取当前位置

Question

公共类MapsActivity扩展了FragmentActivity实现了OnMapReadyCallback{

private GoogleMap mMap;
private Location myLocation;
private static final int INITIAL_REQUEST=1337;
private static final int LOCATION_REQUEST=INITIAL_REQUEST+3;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps);

    // Get Current Location

    // Obtain the SupportMapFragment and get notified when the map is ready to be used.
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);
}


/**
 * Manipulates the map once available.
 * This callback is triggered when the map is ready to be used.
 * This is where we can add markers or lines, add listeners or move the camera. In this case,
 * we just add a marker near Sydney, Australia.
 * If Google Play services is not installed on the device, the user will be prompted to install
 * it inside the SupportMapFragment. This method will only be triggered once the user has
 * installed Google Play services and returned to the app.
 */
@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;

   /* // Add a marker in Sydney and move the camera
    LatLng sydney = new LatLng(-34, 151);
    mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
    mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));*/
    mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker").snippet("Snippet"));

    // Enable MyLocation Layer of Google Map
    mMap.setMyLocationEnabled(true);

    // Get LocationManager object from System Service LOCATION_SERVICE
    LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

    // Create a criteria object to retrieve provider
    Criteria criteria = new Criteria();

    // Get the name of the best provider
    String provider = locationManager.getBestProvider(criteria, true);

    // Get Current Location
    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
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //public void onRequestPermissionsResult(int requestCode, String[] permissions,int[] grantResults)
        ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.ACCESS_FINE_LOCATION},LOCATION_REQUEST);

        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    Location myLocation = locationManager.getLastKnownLocation(provider);

    // set map type
    mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);

    // Get latitude of the current location
    double latitude = myLocation.getLatitude();

    // Get longitude of the current location
    double longitude = myLocation.getLongitude();

    // Create a LatLng object for the current location
    LatLng latLng = new LatLng(latitude, longitude);

    // Show the current location in Google Map
    mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));

    // Zoom in the Google Map
    mMap.animateCamera(CameraUpdateFactory.zoomTo(14));
    mMap.addMarker(new MarkerOptions().position(new LatLng(latitude, longitude)).title("You are here!").snippet("Consider yourself located"));

}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions,int[] grantResults){
    switch (requestCode) {
        case LOCATION_REQUEST: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                doLocationThing();
                // permission was granted, yay! Do the
                // contacts-related task you need to do.


            } else {
                bzzzt();
                // permission denied, boo! Disable the
                // functionality that depends on this permission.
            }
            return;
        }

        // other 'case' lines to check for other
        // permissions this app might request
    }
}
private void doLocationThing() {
    Toast.makeText(this, "Loacation fetched", Toast.LENGTH_SHORT).show();
}
private void bzzzt() {
    Toast.makeText(this, "not found", Toast.LENGTH_LONG).show();
}

}

错误D/AndroidRuntime：正在关闭VM 02-25 16:31:40.313 153 30-15330/com.vivanta.location E/AndroidRuntime：致命异常：main process：com.vivanta.location,PID:15330 java.lang.runtimeException：无法启动活动ComponentInfo{com.vivanta.location/com.vivanta.location.mapsactivity}:java.lang.IllegalArgumentException：只能对Android.app.activitythread.performLaunchActivity（90）在Android.app.activityThread.-Wrap11(activityThread.java)，在Android.app.activityThread.h.h.handleMessage(activityThread.java:1354)，在Android.os.handler.dispatchMessage(handler.java:102)，在Android.os.handler.dispatchMessage(handler.java:148)，在Android.app.activityThread.loop(handler.java:148)，在Android.app.activityThread.main.internal.os.zygoteinit.main（Zygoteinit.java:618)原因：java.lang.IllegalArgumentException：只能对Android.support.v4.app.fragmentactivity.validaterequestPermissionsRequestCode(fragmentactivity.java:799)在Android.support.v4.app.activityCompatapi23.requestPermissions(activityCompat.java:29)在在Android.app.instrumentation.callactivityoncreate（activity.java:6245)在Android.app.activitythread.performLaunchactivity（activitythread.java:2379)在Android.app.activitythread.handlelaunchactivity（activitythread.java:2490) 在Android.app.activitythread.-Wrap11（activitythread.java.-Wrap11） 在Android.app.activitythread.java:1354)， 在loop（looper.jav答：148） 在Android.app.activitythread.main（activitythread.java:5443） 在java.lang.reflect.Method.invoke（原生方法） 在com.android.internal.os.zygoteinit$methodandargscaller.run（zygoteinit.java:728) 在com.android.internal.os.zygoteinit.main（zygoteinit.java:618) 在com.android.internal.os.zygoteinit.main

Answer 1

用runtimePermissionsRequest函数包装整个onmapReady函数，如下所示：

@Override
public void onMapReady(GoogleMap googleMap) {
    if(!runtimePermissionsReqest()){
      // your entire code here.
    }
}


private boolean runtimePermissionsRequest() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M &&
            ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED ||
            ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) != PackageManager.PERMISSION_GRANTED) {
        requestPermissions(new String[]{
                android.Manifest.permission.ACCESS_FINE_LOCATION,
                android.Manifest.permission.ACCESS_COARSE_LOCATION}, 100);
        return true;
    }
    return false;
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (requestCode == 100) {
        if (grantResults[0] != PackageManager.PERMISSION_GRANTED &&
                grantResults[1] != PackageManager.PERMISSION_GRANTED) {
            runtimePermissionsRequest();
        }
    }
}