package com.czh.locationtest;

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;

public class MainActivity extends AppCompatActivity {
    private TextView positionTextView;
    private LocationManager locationManager;
    private String provider;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        positionTextView = (TextView) findViewById(R.id.position_text_view);
        locationManager = (LocationManager) getSystemService(Context.
                LOCATION_SERVICE);
        List<String> providerList = locationManager.getProviders(true);
        if (providerList.contains(LocationManager.GPS_PROVIDER)) {
            provider = LocationManager.GPS_PROVIDER;
        }else if (providerList.contains(LocationManager.NETWORK_PROVIDER)) {
            provider = LocationManager.NETWORK_PROVIDER;
        } else {
            Toast.makeText(this, "No location provider to use",
                    Toast.LENGTH_SHORT).show();
            return;
        }
        Location location = locationManager.getLastKnownLocation(provider);
        if (location != null) {
            showLocation(location);
        }
        locationManager.requestLocationUpdates(provider, 5000, 1,
                locationListener);
    }

    LocationListener locationListener = new LocationListener() {
        @Override
        public void onStatusChanged(String provider, int status, Bundle
                extras) {
        }
        @Override
        public void onProviderEnabled(String provider) {
        }
        @Override
        public void onProviderDisabled(String provider) {
        }
        @Override
        public void onLocationChanged(Location location) {
// 更新当前设备的位置信息
            showLocation(location);
        }
    };

    protected void onDestroy() {
        super.onDestroy();
        if (locationManager != null) {
// 关闭程序时将监听器移除
            locationManager.removeUpdates(locationListener);
        }
    }

    private void showLocation(Location location) {
        String currentPosition = "latitude is " + location.getLatitude() + "\n"
                + "longitude is " + location.getLongitude();
        positionTextView.setText(currentPosition);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

}