Question

除此行外，一切正常：LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);

它引发了cannot resolve method requestLocationUpdates错误。我在文档中没有看到任何内容，但我对Android很新，所以可能会遗漏一些东西。

这是完整的代码。我出错的任何想法？谢谢！

package com.example.alham.location;

import android.location.Location;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;

public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener{

    private final String LOG_TAG ="LaurenceTestApp";
    private TextView txtOutput;
    private GoogleApiClient mGoogleApiClient;
    private LocationRequest mLocationRequest;

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

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addApi(LocationServices.API)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .build();
        txtOutput = (TextView) findViewById(R.id.txtOutput);
    }

    @Override
    protected void onStart(){
        super.onStart();
        mGoogleApiClient.connect();
    }

    @Override
    protected void onStop(){
        mGoogleApiClient.disconnect();
        super.onStop();
    }

    @Override
    public void onConnected(Bundle bundle){
        mLocationRequest = LocationRequest.create();
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        mLocationRequest.setInterval(1000);

        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
    }

    @Override
    public void onLocationChanged(Location location){
        Log.i(LOG_TAG,location.toString());
        txtOutput.setText(Double.toString(location.getLatitude()));
    }

    @Override
    public void onConnectionSuspended(int i){
        Log.i(LOG_TAG, "GoogleApiClient connection has been suspended");
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult){
        Log.i(LOG_TAG, "GoogleApiClient connection has failed");
    }
}

Answer 1

在清单中添加：

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

这在代码中：

    LocationServices.FusedLocationApi.requestLocationUpdates(
                mGoogleApiClient, mLocationRequest, new LocationListener() {
                    @Override
                    public void onLocationChanged(Location location) {
                        // Here you have the updated location
                    }
                });
    }

Answer 2

您必须检查Marshmallow及更高版本是否授予位置权限。

使它像，

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)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    LocationServices.FusedLocationApi.requestLocationUpdates(
            googleApiClient, locationRequest, this);

Android Studio无法解析方法requestLocationUpdates FusedLocationProviderAPI

2 个答案: