安卓学习笔记--获取网络连接状态

package com.example.wifitest;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;  
import android.content.Context;  
import android.net.ConnectivityManager;
import android.net.NetworkInfo.State;
import android.net.wifi.ScanResult;  
import android.net.wifi.WifiConfiguration;  
import android.net.wifi.WifiInfo;  
import android.net.wifi.WifiManager;  
import android.net.wifi.WifiManager.WifiLock;  
public class MainActivity extends Activity {
	TextView txt3G;
	TextView txtWifi;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        txt3G=(TextView)findViewById(R.id.txt3G);
        txtWifi=(TextView)findViewById(R.id.txtWifi);
        ConnectivityManager conMan = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

    	//mobile 3G Data Network
    	State mobile = conMan.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();
    	txt3G.setText(mobile.toString()); //显示3G网络连接状态
    	//wifi
    	State wifi = conMan.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();
    	txtWifi.setText(wifi.toString()); //显示wifi连接状态
    	if(wifi.toString().equals("DISCONNECTED")){
    		Toast.makeText(MainActivity.this, "未连接wifi", Toast.LENGTH_LONG).show();
    	}
    }
    private void checkNetworkInfo()
	{
	
	}

    @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;
    }
    
}