Question

有几天我尝试修改程序，这样每次按下按钮addMarkerButton时，将Marker放在我的新位置。当我立即打开应用程序以显示我的位置时，没有任何按钮始终导航我当前的位置，当您按下addMarkerButton程序时，在我的新位置放置标记，当我去其他地方时，我按addMarkerButton想要第二个位置的第二个标记，但那个没有消失。可能吗？我已经尝试了很多组合，在互联网上寻求帮助，什么都没有。

我的按钮看起来像这样（目前只有2个标记）：

addMarkerButton.setOnClickListener(new View.OnClickListener() {
    public void onClick(View view) {
        LatLng latLng = new LatLng(currentLatitude, currentLongitude);       

        if (tab[0] == null) {
            MarkerOptions options = new MarkerOptions()
                    .position(latLng)
                    .title("I am");
            tab[0] = mMap.addMarker(options);
        }
        else if (tab [0] != null) {
            MarkerOptions options = new MarkerOptions()
                    .position(latLng)
                    .title("I am");
            tab[1] = mMap.addMarker(options);

在他的申请中我使用：

public class MapsActivity extends FragmentActivity implements
        OnMapReadyCallback,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener {

所以我有：

@Override
public void onConnected(Bundle bundle) {
    if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        return;
    }
    Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
    if (location == null) {
        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, (LocationListener) this);
    }
    else {
        handleNewLocation(location) ;
    }
}

@Override
public void onConnectionSuspended(int i) {
}

@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
    if (connectionResult.hasResolution()) {
        try {
            connectionResult.startResolutionForResult(this, CONNECTION_FAILURE_RESOLUTION_REQUEST);
        } catch (IntentSender.SendIntentException e) {
            e.printStackTrace();
        }
    } else {
        Log.i(TAG, "Location services connection failed with code " + connectionResult.getErrorCode());
    }
}

方法onMapReady()我设置了mGoogleApiClient.connect()

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;
    mGoogleApiClient.connect();

    if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        return;
    }    
}

下载位置的方法：

public void handleNewLocation(Location location) {
    Log.d(TAG, location.toString());

    currentLatitude = location.getLatitude();
    currentLongitude = location.getLongitude();

    LatLng latLng = new LatLng(currentLatitude, currentLongitude);
    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 15));
}

以及方法onCreate()

中的添加

mGoogleApiClient = new GoogleApiClient.Builder(this)
        .addConnectionCallbacks(this)
        .addOnConnectionFailedListener(this)
        .addApi(LocationServices.API)
        .build();

mLocationRequest = LocationRequest.create()
        .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
        .setInterval(10 * 1000)
        .setFastestInterval(1 * 1000);

随时下载最后一个位置，并放置后续标记

0 个答案: