自由手記

1.在main.xml新增下面藍色程式碼

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:orientation="vertical"
       android:layout_width="fill_parent"
       android:layout_height="fill_parent" >

<Button 
       android:text="開啟Wifi" 
       android:id="@+id/turnOnWifiBtn"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content">

</Button>

<Button
        android:text="關閉Wifi" android:id="@+id/turnOffWifiBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

 </Button>

</LinearLayout>

2.在WifiManagerEx.java新增下面藍色程式碼

package feu.hcc;

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

public class WifiManagerEx extends Activity {
    /** Called when the activity is first created. */
        private WifiManager wiFiManager;
        private Button turnOnWifiBtn;
        private Button turnOffWifiBtn;
 
  
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //取得WifiManager
        wiFiManager = (WifiManager)this.getSystemService(Context.WIFI_SERVICE);
        turnOnWifiBtn=(Button) findViewById(R.id.turnOnWifiBtn);
        turnOffWifiBtn=(Button)findViewById(R.id.turnOffWifiBtn);
        //開啟wifi
        turnOnWifiBtn.setOnClickListener(new View.OnClickListener(){
         
         public void onClick(View v){
           if(!wiFiManager.isWifiEnabled()){
            wiFiManager.setWifiEnabled(true);
           }
         }      
         
         
        });
        //關閉wifi
        turnOffWifiBtn.setOnClickListener(new View.OnClickListener(){
         
         public void onClick(View v){
          if(wiFiManager.isWifiEnabled()){
           wiFiManager.setWifiEnabled(false);
          }
          }
         
        });

}}

3.在AndroidManifest.xml新增下面藍色程式碼

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="feu.hcc"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".WifiManagerEx"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
    
    <use-permission android:name="android.permission.CHANGE_WIFI_STATE"></use-permission>
    <use-permission android:name="android.permission.WAKE_LOCK"></use-permission>
    <use-permission android:name="android.permission.ACCESS_WIFI_STATE"></use-permission>
</manifest>