package com.zmlxj.getcurrentlocation;

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

import android.Manifest;
import android.content.Context;
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.Build;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import java.util.List;

public class MainActivity extends AppCompatActivity {
    private String locationStr = "";
    private String message = "";
    private static final int REQUEST_CODE = 10;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        getLocation();
    }

    private void getLocation() {

        if (Build.VERSION.SDK_INT >= 23) {// android6 执行运行时权限
            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.
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION,Manifest.permission.ACCESS_COARSE_LOCATION}, REQUEST_CODE);
            }
        }

        Criteria criteria = new Criteria();
        criteria.setAccuracy(Criteria.ACCURACY_COARSE);//低精度，如果设置为高精度，依然获取不了location。
        criteria.setAltitudeRequired(true);//不要求海拔
        criteria.setBearingRequired(true);//不要求方位
        criteria.setCostAllowed(true);//允许有花费
        criteria.setPowerRequirement(Criteria.POWER_LOW);//低功耗
        //获取LocationManager
        LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        // 获取最好的定位方式

        String provider = locationManager.getBestProvider(criteria, true); // true 代表从打开的设备中查找

        // 获取所有可用的位置提供器
        List<String> providerList = locationManager.getProviders(true);
        // 测试一般都在室内，这里颠倒了书上的判断顺序
        if (providerList.contains(LocationManager.NETWORK_PROVIDER)) {
            provider = LocationManager.NETWORK_PROVIDER;
        } else if (providerList.contains(LocationManager.GPS_PROVIDER)) {
            provider = LocationManager.GPS_PROVIDER;
        } else {
            // 当没有可用的位置提供器时，弹出Toast提示用户
            Toast.makeText(this, "Please Open Your GPS or Location Service", Toast.LENGTH_SHORT).show();
            return;
        }

        LocationListener locationListener = new LocationListener(){
            //当位置改变的时候调用
            @Override
            public void onLocationChanged(Location location) {
                //经度
                double longitude = location.getLongitude();
                //纬度
                double latitude = location.getLatitude();

                //海拔
                double altitude = location.getAltitude();

                locationStr = longitude+"_"+latitude;
//                launcher.callExternalInterface("getLocationSuccess", locationStr);
            }

            //当GPS状态发生改变的时候调用
            @Override
            public void onStatusChanged(String provider, int status, Bundle extras) {

                switch (status) {

                    case LocationProvider.AVAILABLE:
                        message = "当前GPS为可用状态!";
                        break;

                    case LocationProvider.OUT_OF_SERVICE:
                        message = "当前GPS不在服务内!";
                        break;

                    case LocationProvider.TEMPORARILY_UNAVAILABLE:
                        message = "当前GPS为暂停服务状态!";
                        break;

                }
//                launcher.callExternalInterface("GPSStatusChanged", message);

            }

            //GPS开启的时候调用
            @Override
            public void onProviderEnabled(String provider) {
                message = "GPS开启了!";
//                launcher.callExternalInterface("GPSOpenSuccess", message);

            }
            //GPS关闭的时候调用
            @Override
            public void onProviderDisabled(String provider) {
                message = "GPS关闭了!";
//                launcher.callExternalInterface("GPSClosed", message);
//
            }
        };

        //获取上次的location
        Location location = locationManager.getLastKnownLocation(provider);

        /**
         * 参1:选择定位的方式
         * 参2:定位的间隔时间
         * 参3:当位置改变多少时进行重新定位
         * 参4:位置的回调监听
         */
        locationManager.requestLocationUpdates(provider, 10000, 0, locationListener);
        while(location == null){
            location = locationManager.getLastKnownLocation(provider);
        } //移除更新监听
         locationManager.removeUpdates(locationListener);
        if (location != null) {
        // 不为空,显示地理位置经纬度 //
            // 经度
            double longitude = location.getLongitude();
            //纬度
            double latitude = location.getLatitude();
            //海拔
            double altitude = location.getAltitude();
            locationStr = longitude+ "_"+latitude+" "+altitude;

            Log.i("当前获取的值",locationStr);
//            launcher.callExternalInterface( "getLocationSuccess", locationStr);
        }





    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        if (requestCode == REQUEST_CODE) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // Permission Granted准许
                getLocation();
            } else {
                // Permission Denied拒绝
            }
        }
    }
}