java Android:FusedLocationProvider，每隔几秒钟获取一次位置

Question

我正在制作一个应用程序，跟踪用户的位置并最终上传到Firebase服务器

我创建了一个简单的应用程序，当我按下屏幕上的按钮时，它会显示位置。问题是，当我走了几米后再次按下它时，它不会改变位置（但当我重新进入应用程序时，我会得到一个新位置）。为了让应用程序每X秒更新一次位置，我需要添加什么？这是我的活动：

package com.example.gpstest;

import 安卓.content.pm.PackageManager;
import 安卓.location.Location;
import 安卓.support.v4.app.ActivityCompat;
import 安卓.support.v7.app.AppCompatActivity;
import 安卓.os.Bundle;
import 安卓.view.View;
import 安卓.widget.Button;
import 安卓.widget.TextView;

import com.google.安卓.gms.location.FusedLocationProviderClient;
import com.google.安卓.gms.location.LocationServices;
import com.google.安卓.gms.tasks.OnSuccessListener;

import static 安卓.Manifest.permission.ACCESS_FINE_LOCATION;

public class MainActivity extends AppCompatActivity {

    private FusedLocationProviderClient client;


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

        requestPermission();
        client = LocationServices.getFusedLocationProviderClient(this);
        Button button = findViewById(R.id.getLocation);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (ActivityCompat.checkSelfPermission(MainActivity.this, ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED ) {

                    return;
                }
                client.getLastLocation().addOnSuccessListener(MainActivity.this, new OnSuccessListener<Location>() {
                    @Override
                    public void onSuccess(Location location) {

                        if(location != null){
                            TextView lat = findViewById(R.id.location1);
                            TextView lon = findViewById(R.id.location2);
                            TextView alt = findViewById(R.id.location3);
                            lat.setText(Double.toString(location.getLatitude()));
                            lon.setText(Double.toString(location.getLongitude()));
                            alt.setText(Double.toString(location.getAltitude()));
                        }
                    }
                });
            }
        });
    }

    private void requestPermission(){
        ActivityCompat.requestPermissions(this, new String[]{ACCESS_FINE_LOCATION}, 1);
    }
}

Answer 1

因为您从getLastLocation获取位置。为此，您必须实现LocationCallback

consider this link了解更多信息

Answer 2

//在类中实现这些接口 GoogleapClient。ConnectionCallbacks，GoogleAppClient。OnConnectionFailedListener，LocationListener。 //而不是使用这个代码

未连接的公共空间（捆绑包）{

    Location mLastLocation = null;
    if (mGoogleApiClient.isConnected()) {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

            //    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 precise.
            return;
        }
        mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
                mGoogleApiClient);

        if (mLastLocation != null) {
            latLng = new LatLng(mLastLocation.getLatitude(), mLastLocation.getLongitude());
        }

        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(5000); //5 seconds
        mLocationRequest.setFastestInterval(3000); //3 seconds
        mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
        //mLocationRequest.setSmallestDisplacement(0.1F); //1/10 meter

        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
    } else {
        buildGoogleApiClient();
        mGoogleApiClient.connect();
    }

}