Android管理WIFI

首先，需要許可權

   <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>

WIF的狀態在WifiManager中定義了常量，都是public static final int類型的，如下

public static final int WIFI_STATE_DISABLEDWi-Fi is disabled.Constant Value: 1 (0x00000001)public static final int WIFI_STATE_DISABLINGWi-Fi is currently being disabled. The state will change to WIFI_STATE_DISABLED if it finishes successfully.Constant Value: 0 (0x00000000)public static final int WIFI_STATE_ENABLEDWi-Fi is enabled.Constant Value: 3 (0x00000003)public static final int WIFI_STATE_ENABLINGWi-Fi is currently being enabled. The state will change to WIFI_STATE_ENABLED if it finishes successfully.Constant Value: 2 (0x00000002)public static final int WIFI_STATE_UNKNOWNWi-Fi is in an unknown state. This state will occur when an error happens while enabling or disabling.Constant Value: 4 (0x00000004)

定義一個並且初始化WifiManager manager==(WifiManager) Context.getSystemService(Context.WIFI_SERVICE);

啟動WIFI manager.setWifiEnabled(true);

關閉WIFI manager.setWifiEnabled(false);

擷取WIFI狀態 manager.getWifiState();返回前面說的五種狀態的一種

下面是全部代碼

package com.zhycheng.wifi;import android.app.Activity;import android.content.Context;import android.net.wifi.WifiManager;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class WIFIDemoActivity extends Activity implements OnClickListener {Button start,stop,state;WifiManager manager;    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        start=(Button) findViewById(R.id.startWIFI);        stop=(Button) findViewById(R.id.stopWIFI);        state=(Button) findViewById(R.id.getSTATE);        start.setOnClickListener(this);        stop.setOnClickListener(this);        state.setOnClickListener(this);    }@Overridepublic void onClick(View v) {manager=(WifiManager) this.getSystemService(Context.WIFI_SERVICE);switch(v.getId()){case R.id.startWIFI:manager.setWifiEnabled(true);System.out.println("當前WIFI狀態為"+manager.getWifiState());Toast.makeText(this, "當前WIFI狀態為"+manager.getWifiState(), Toast.LENGTH_SHORT).show();break;case R.id.stopWIFI:manager.setWifiEnabled(false);System.out.println("當前WIFI狀態為"+manager.getWifiState());Toast.makeText(this, "當前WIFI狀態為"+manager.getWifiState(), Toast.LENGTH_SHORT).show();break;case R.id.getSTATE:System.out.println("當前WIFI狀態為"+manager.getWifiState());Toast.makeText(this, "當前WIFI狀態為"+manager.getWifiState(), Toast.LENGTH_SHORT).show();break;}}}

樣本工程下載：點擊開啟連結