Android：FusedLocationProvider，每隔幾秒獲取一次位置

Question

我正在制作一個跟蹤用戶位置並最終將其上傳到 Firebase 服務器的應用程序。

我創建了一個簡單的應用程序，當我按下屏幕上的按鈕時，它會顯示位置。 問題是當我走了幾米后再次按下它時它不會改變位置（雖然我重新進入應用程序時確實得到了一個新位置）。 我需要添加什么才能讓應用每 X 秒更新一次位置？ 這是我的活動：

package com.example.gpstest;

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

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

import static android.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

因為您從getLastLocation獲得位置。 為此，您必須實現LocationCallback。

考慮此鏈接以獲取更多信息

Answer 2

//在您的類GoogleApiClient.ConnectionCallbacks，GoogleApiClient.OnConnectionFailedListener，LocationListener中實現這些接口。 //比使用此代碼

公共無效onConnected（捆綁包）{

    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();
    }

}

Answer 3

我最終用這個視頻解決了我的問題： https : //youtu.be/4xcrZcnBk60