wifi开启关闭

wifi的5中状态

WIFI_STATE_DISABLED:   无线网卡不可用

WIFI_STATE_DISABLING:无线网卡正在关闭

WIFI_STATE_ENABLED : 无线网卡可用

WIFI_STATE_ENABLING:l无线网卡正在打开

WIFI_STATE_UNKNOWN:未知网卡状态

 

 

 

Wifi权限

<!--wifi 权限 -->
               //Mainfest.permission 类中(可以查找权限)
	<uses-permission  android:name="android.permission.CHANGE_NETWORK_STATE"/>
	<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>

 

WifiActivity

package com.example.wifi;

import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class WifiActivity extends Activity {

	Button btnOpen;
	Button btnClose;
	Button btnState;
	WifiManager wifi;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_wifi);
        
        btnOpen =  (Button) findViewById(R.id.open); 
        btnClose =  (Button) findViewById(R.id.close);
        btnState =  (Button) findViewById(R.id.state);
        
        btnOpen.setOnClickListener(new View.OnClickListener() {
			
			public void onClick(View v) {
				//获得wifi对象，Context.getSystemService(Context.WIFI_SERVICE);
				wifi = (WifiManager) WifiActivity.this.getSystemService(Context.WIFI_SERVICE);
				wifi.setWifiEnabled(true);//设置wifi可用
				Toast.makeText(WifiActivity.this, wifi.getWifiState(), Toast.LENGTH_SHORT).show();
				
			}
		});
        
        btnClose.setOnClickListener(new View.OnClickListener() {
			
			public void onClick(View v) {
				wifi = (WifiManager) WifiActivity.this.getSystemService(Context.WIFI_SERVICE);
				wifi.setWifiEnabled(false);//设置wifi不可用，但是wifi关闭需要时间
				Toast.makeText(WifiActivity.this, wifi.getWifiState(), Toast.LENGTH_SHORT).show();
				
			}
		});
        
        btnState.setOnClickListener(new View.OnClickListener() {
			
			public void onClick(View v) {
				wifi = (WifiManager) WifiActivity.this.getSystemService(Context.WIFI_SERVICE);
				//wifi.setWifiEnabled(false);
				Toast.makeText(WifiActivity.this, wifi.getWifiState(), Toast.LENGTH_SHORT).show();
				
			}
		}); 
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_wifi, menu);
        return true;
    }
}