11.05学习

定位信息获取

写了一个定位获取的功能应用，模拟一下app获取定位时具体代码实现

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package cn.twle.android.GPSUpdate;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.provider.Settings;
import android.widget.TextView;
import android.widget.Toast;

import static android.Manifest.permission.ACCESS_FINE_LOCATION;

public class MainActivity extends AppCompatActivity {

    private LocationManager lm;
    private TextView ms_msg;
    private String loc_msg;

    private Handler handler = new Handler(new Handler.Callback() {
        @Override
        public boolean handleMessage(@NonNull Message msg) {
            if(msg.what == 0x001){
                ms_msg.setText(loc_msg);
            }
            return false;
        }
    });

    private LocationListener mLocationListener = new LocationListener() {
        @Override
        public void onLocationChanged(@NonNull Location location) {
            updataShow(location);
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ms_msg = (TextView)findViewById(R.id.ms_msg);

        lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

        locationUpdata();
    }
    public void onResume(){
        super.onResume();
        locationUpdata();
    }
    public void onPause()
    {
        super.onPause();
        lm.removeUpdates(mLocationListener);
    }
    public void locationUpdata(){
        if(checkCallingOrSelfPermission(ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED){
            Toast.makeText(MainActivity.this,"请打开GPS",Toast.LENGTH_SHORT).show();

            Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            startActivityForResult(intent,0);
            return;
        }
        Location location = lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
        updataShow(location);
        lm.requestLocationUpdates(LocationManager.GPS_PROVIDER,2000,8,mLocationListener);
    }

    private void updataShow(Location location) {
        if(location != null){
            StringBuilder sb = new StringBuilder();
            sb.append("当前位置信息:\n");
            sb.append("精度："+location.getLongitude()+"\n");
            sb.append("纬度"+location.getLatitude()+"\n");
            sb.append("高度"+location.getAltitude()+"\n");
            sb.append("定位精度："+location.getAccuracy()+"\n");

            loc_msg = sb.toString();
        }
        else
            loc_msg = "";
        handler.sendEmptyMessage(0x001);
    }

}

成果展示:

image-20201204183508543