Android : GPS定位 获取当前位置—简单应用
示例图：
MainActivity.java
package com.example.mygpsapp;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
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.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private Button button, btnGetData;
//系统位置管理对象
private LocationManager locationManager;
private TextView textView;
private EditText editText;
private ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = findViewById(R.id.btn_get_provider);
textView = findViewById(R.id.tv_see);
listView = findViewById(R.id.list_view);
btnGetData = findViewById(R.id.btn_get_data);
editText = findViewById(R.id.et_content);
//1.获取系统 位置管理对象 LocationManager
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// 2. 获取所有设备名字
List providerName = locationManager.getAllProviders();
//2.1获取指定设备 gps
// LocationProvider gpsProvider = locationManager.getProvider(LocationManager.GPS_PROVIDER);
//3 把数据放到listView 中显示
/**3个
* passive: 代码表示：LocationManager.PASSIVE_PROVIDER
* gps: 代码表示：LocationManager.GPS_PROVIDER
* network: 网络获取定位信息 LocationManager.NETWORK_PROVIDER
* */
ArrayAdapter arrayAdapter = new ArrayAdapter<>(this, R.layout.list_layout, providerName);
listView.setAdapter(arrayAdapter);
//从6.0系统开始,需要动态获取权限
int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION);
if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 0);
}
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Criteria 过滤 找到 定位设备
//1.获取位置管理对象 LocationManager
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
//2. 创建 Criteria 过滤条件
Criteria criteria = new Criteria();
//要求设备是免费的
criteria.setCostAllowed(false);
// 要求能提供高精度信息
criteria.setAltitudeRequired(true);
// 要求能提供反方向信息
criteria.setBearingRequired(true);
// 设置精度 标准不限
// criteria.setAccuracy(Criteria.NO_REQUIREMENT);
// 设置功率要求 电量 标准不限
// criteria.setPowerRequirement(Criteria.NO_REQUIREMENT);
//获取最佳提供商
List datas = locationManager.getAllProviders();
textView.setText(datas.toString());
}
});
//获取定位信息事件
btnGetData.setOnClickListener(new View.OnClickListener() {
@SuppressWarnings("all") //警告过滤
@Override
public void onClick(View v) {
try {
//1.获取系统 位置管理对象 LocationManager
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
//2.从GPS 获取最近定位信息
//获取到位置相关信息
Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
//把信息设置到文本框中
updatView(location);
//设置每3秒 获取一次Gps 定位信息
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3000, 8, new LocationListener() {
@Override
public void onLocationChanged(@NonNull Location location) {
//当GPS 位置发生改变时 执行方法
updatView(location);
}
@Override
public void onProviderDisabled(@NonNull String provider) {
//禁用时 执行方法
updatView(null);
}
@Override
public void onProviderEnabled(@NonNull String provider) {
// 可以用时 执行方法
updatView(locationManager.getLastKnownLocation(provider));
}
});
} catch (Throwable e) {
e.printStackTrace();
}
}
});
}
//把信息设置到文本框中
public void updatView(Location location) {
if(location != null){
StringBuilder cont = new StringBuilder();
cont.append("实时定位信息：\n");
cont.append("经度：");
cont.append(location.getLongitude());
cont.append("\n纬度：");
cont.append(location.getLatitude());
cont.append("\n高度：");
cont.append(location.getAltitude());
cont.append("\n速度：");
cont.append(location.getSpeed());
cont.append("\n方向：");
cont.append(location.getBearing());
editText.setText(cont.toString());
}else {
editText.setText("没有开启定位信息！");
}
}
//请求权限结果
// ACCESS_FINE_LOCATION 访问精细定位
// ACCESS_COARSE_LOCATION 访问粗略定位
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case 0:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(MainActivity.this, "访问精细定位权限授权成功", Toast.LENGTH_SHORT).show();
//从6.0系统开始,需要动态获取权限
int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION);
if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, 1);
}
}
break;
case 1:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(MainActivity.this, "访问粗略定位权限授权成功", Toast.LENGTH_SHORT).show();
}
break;
default:
break;
}
}
} 布局文件 activity_main.xml
listView 布局文件 list_layout.xml
权限配置 AndroidManifest.xml