Question

我有这个代码（主要来自教程）以十进制形式显示GPS坐标。我想使用按钮来保存当前位置int某些数据结构或什么不....那部分不是问题。我想知道如何最好地从大量更新中捕获GPS数据。

我想捕获onClickListener中的坐标。

我应该使用getLasKnown（）吗？

package com.example.geolocation;

import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.util.ArrayList;


public class MainActivity extends Activity {

TextView textLat, textLong;
Button locateBTN;

double mLat, mLong;

ArrayList<Double> mLats = new ArrayList<Double>();
ArrayList<Double> mLongs = new ArrayList<Double>();


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    textLat = (TextView) findViewById(R.id.lat_output);
    textLong = (TextView) findViewById(R.id.long_output);

    locateBTN = (Button) findViewById(R.id.locate_button);

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

    LocationListener locationListener =
            new myLocationlistener();
    locationManager
            .requestLocationUpdates(LocationManager.GPS_PROVIDER,
                    0, 0, locationListener);

    locateBTN.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //STUB

        }
    });


}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.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();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

private class myLocationlistener implements LocationListener {
    @Override
    public void onLocationChanged(Location location) {
        if ( location != null ){
            double pLong = location.getLongitude();
            double pLat = location.getLatitude();

            textLat.setText(Double.toString(pLat));
            textLong.setText(Double.toString(pLong));

        }
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }
}
}

Answer 1

单击按钮，可以使用LocationManager对象getLastKnownLocation方法 - http://developer.android.com/reference/android/location/LocationManager.html#getLastKnownLocation(java.lang.String)

Answer 2

获取GPS坐标的最佳方法是使用Fused Location API

中的Google

https://developer.android.com/reference/com/google/android/gms/location/FusedLocationProviderApi.html

否则你必须投入大量代码才能获得正确的坐标。与仅使用GPS坐标相比，这种Api消耗的电池要少得多。

在Android中捕获GPS Coords

2 个答案: