GPS学习笔记

①LocationManager类

作用与TelephonyManager、AudioManager等服务作用类似，所有GPS定位相关的服务、对象都由该对象来产生。

获取方法：Context.getSystemService(Context.LOCATION_SERVICE)

常用字段：

②LocationProvider类

作用：该类的对象是定位组件的抽象表示，通过该类的对象，可以获取定位组件的相关信息。

③Location类

作用：代表位置信息的一个抽象类，可以用来获取定位信息（比如：经纬度，高度，速度，方向等）

案例：获取定位数据

package com.example.gpstestdemo;

import android.support.v7.app.ActionBarActivity;
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.widget.EditText;


public class MainActivity extends ActionBarActivity {
	LocationManager locManager;
	EditText show;
	
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        show = (EditText)findViewById(R.id.text);
        locManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        Location location = locManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        updateView(location);
        locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,500,8,new LocationListener() {
			
			@Override
			public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
				// TODO Auto-generated method stub
			}
			
			@Override
			public void onProviderEnabled(String arg0) {
				// TODO Auto-generated method stub
				updateView(locManager.getLastKnownLocation(arg0));
			}
			
			@Override
			public void onProviderDisabled(String arg0) {
				// TODO Auto-generated method stub
				updateView(null);
			}
			
			@Override
			public void onLocationChanged(Location location) {
				// TODO Auto-generated method stub
				updateView(location);
			}
		});
    }


    @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);
    }
    
    public void updateView(Location newLocation){
    	if (newLocation != null){
    		StringBuilder sb = new StringBuilder();
    		sb.append("实时的位置信息：\n");
    		sb.append("经度：");
    		sb.append(newLocation.getLongitude());
    		sb.append("\n纬度：");
    		sb.append(newLocation.getLatitude());
    		sb.append("\n高度：");
    		sb.append(newLocation.getAltitude());
    		sb.append("\n速度：");
    		sb.append(newLocation.getSpeed());
    		sb.append("\n方向：");
    		sb.append(newLocation.getBearing());
    		show.setText(sb);
    	}else{
    		show.setText("暂时无法获取GPS信号");
    	}
    }
}

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