获取定位信息（经度，纬度）

一、项目思路

 二、项目源码

package com.example.myself;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.location.LocationProvider;
import android.os.Bundle;
import android.view.WindowManager;
import android.widget.TextView;

import java.util.Iterator;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private TextView text;//定义用于显示LocationProvider名称的TextView组件

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);//设置全屏显示
        text = (TextView) findViewById(R.id.provider);    //获取显示LocationProvider名称的TextView组件

        LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        //权限检查
        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
            //    Activity#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 Activity#requestPermissions for more details.
            return;
        }
        locationManager.requestLocationUpdates(
                LocationManager.GPS_PROVIDER,//指定GPS定位的提供者
                1000,//间隔时间
                1,//定位间隔1米
                new LocationListener() {//监听GPS定位信息是否改变
                    @Override
                    public void onLocationChanged(Location location) {//GPS信息发生改变时回调

                    }

                    @Override
                    public void onStatusChanged(String provider, int status, Bundle extras) {//GPS状态改变时回调

                    }

                    @Override
                    public void onProviderEnabled(String provider) {//定位提供者启动时回调

                    }

                    @Override
                    public void onProviderDisabled(String provider) {//定位提供者关闭时回调

                    }
                }
        );

        Location location=locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);//获取最新定位信息
        locationUpdates(location);//将最新的定位信息传递给LocationUpdates()方法
    }

    public void locationUpdates(Location location){
        if(location!=null){//location用于保存定位信息
            StringBuilder stringBuilder=new StringBuilder();//创建字符串构建器，记录定位信息
            stringBuilder.append("您的定位信息是：\n");
            stringBuilder.append("经度：");
            stringBuilder.append(location.getLongitude());
            stringBuilder.append("\n纬度：");
            stringBuilder.append(location.getLatitude());
            text.setText(stringBuilder.toString());//将定位信息显示到页面上
        }else{
            text.setText("没有获取到GPS信息");
        }

    }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingTop="16dp"
    android:paddingRight="64dp"
    android:paddingLeft="64dp"
    android:paddingBottom="16dp"
    android:background="@drawable/blue"
    tools:context=".MainActivity">

    //获取显示信息
    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="26sp"
        android:textColor="#000000"
        android:textStyle="bold"
        android:layout_above="@+id/provider"
        android:text="可用LocationProvider"/>

    //获取提示结果
    <TextView
        android:id="@+id/provider"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#000000"
        android:lineSpacingExtra="5dp"
        android:layout_centerHorizontal="true"
        android:textSize="26sp"
        android:textStyle="bold"/>



</RelativeLayout>

AndroidManifest:(增加权限）

 三、运行截图

 四、遇到的问题

输出没有获取到GPS信息

问题：所在的地方没有GPS信号，找一个空旷的地方进行测样获取

解决时间：8分钟