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;    }    }