安卓开发入门gps获取定位经纬度海拔速度
layout xml 文件
【安卓开发入门gps获取定位经纬度海拔速度】MainActivity类代码
import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.provider.Settings;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
import android.os.Build;
import android.content.pm.PackageManager;
public class MainActivity extends AppCompatActivity {
private String[] perms = {Manifest.permission.ACCESS_FINE_LOCATION};
private final int PERMS_REQUEST_CODE = 200;
private TextView tvLag,tvAlt,tvSpeed;
private LocationManager lm = null;
private Location mLocation;
private MyLocationListner mLocationListner;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvLag = (TextView) findViewById(R.id.tvLag);
tvAlt = (TextView) findViewById(R.id.tvAlt);
tvSpeed = (TextView) findViewById(R.id.tvSpeed);
lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
//Android 6.0以上版本需要临时获取权限
if(Build.VERSION.SDK_INT>Build.VERSION_CODES.LOLLIPOP_MR1&&
PackageManager.PERMISSION_GRANTED!=checkSelfPermission(perms[0])) {
requestPermissions(perms,PERMS_REQUEST_CODE);
}else{
initLocation();
}
}
private void initLocation(){
//判断GPS是否正常启动
if(!lm.isProviderEnabled(LocationManager.GPS_PROVIDER)){
Toast.makeText(MainActivity.this, "请开启GPS...",Toast.LENGTH_SHORT);
//返回开启GPS导航设置界面
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivityForResult(intent,0);
return;
}if (mLocationListner == null)
{
mLocationListner = new MyLocationListner();
}try{
mLocation = lm.getLastKnownLocation(lm.GPS_PROVIDER);
updateView(mLocation);
}catch (SecurityException se){
}try{
/**
* 开启定位监听变化
* 参数1，定位方式：主要有GPS_PROVIDER和NETWORK_PROVIDER，前者是GPS,后者是GPRS以及WIFI定位
* 参数2，位置信息更新周期.单位是毫秒
* 参数3，位置变化最小距离：当位置距离变化超过此值时，将更新位置信息
* 参数4，监听
* 备注：参数2和3，如果参数3不为0，则以参数3为准；参数3为0，则通过时间来定时更新；两者为0，则随时刷新
*/
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3000, 1, mLocationListner);
}catch (SecurityException se){
}}private class MyLocationListner implements LocationListener
{
@Override
public void onLocationChanged(Location location)
{
updateView(location);
}
@Override
public void onProviderDisabled(String provider)
{
updateView(null);
}
@Override
public void onProviderEnabled(String provider)
{
try{
updateView(lm.getLastKnownLocation(provider));
}catch (SecurityException e){}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras)
{}
}private void updateView(Location location)
{
if (location!=null) {
tvLag.setText("经度："+location.getLongitude()+"\n"+"纬度："+location.getLatitude());
tvAlt.setText("当前海拔：" + location.getAltitude() + "m");
tvSpeed.setText("当前速度：" + location.getSpeed() + "m/s");
}else{
tvLag.setText("经度："+"纬度：");
tvAlt.setText("当前海拔：" );
tvSpeed.setText("当前速度：");
}
}@Override
public void onRequestPermissionsResult(int permsRequestCode, String[] permissions, int[] grantResults){
switch(permsRequestCode){
case PERMS_REQUEST_CODE:
boolean storageAccepted = grantResults[0] == PackageManager.PERMISSION_GRANTED;
if(storageAccepted){
initLocation();
}
break;
}
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