Android之Wifi學習(2)------連接Wifi

之前有一篇文章已經簡單的講過Wifi的基本知識，請見Android之Wifi學習(1)。本文主要在此基礎上，進一步完善程序功能，主要功能有打開無線網卡、關閉無線網卡、檢查網卡狀態、掃描網絡、掃描結果、連接Wifi、斷開Wifi、Wifi連接狀態。
運行效果圖如下：

其中連接Wifi是比較讓我頭疼的。需要在程序中進行連接，這會有兩種情況。第一，Wifi沒有密碼，可以直接連接；第二，Wifi有密碼，在程序中給出密碼，然後連接。第一種我查閱相關資料好像確實是可以實現的，第二種我沒找到，我自己也不知道該怎麼去搞。最後想出一個辦法，直接讓程序跳到系統設置的Wifi的頁面，然後讓人手動去設置。觀察了一下Android版的QQ，也確實是這麼做的。不信你瞧：

點擊設置網絡後跳轉到系統設置頁面：

所以此處設置網絡我也可以這麼做，不過還是有點不爽，可能自己對Wifi這塊還不是很熟悉，我會繼續查閱相關API文檔，到時候再跟大家分享，好了，下面貼一下源代碼：
主頁面：

package org.sunchao; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ScrollView; import android.widget.TextView; public class Main extends Activity implements OnClickListener { // 右側滾動條按鈕 private ScrollView sView; private Button openNetCard; private Button closeNetCard; private Button checkNetCardState; private Button scan; private Button getScanResult; private Button connect; private Button disconnect; private Button checkNetWorkState; private TextView scanResult; private String mScanResult; private WifiAdmin mWifiAdmin; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mWifiAdmin = new WifiAdmin(Main.this); init(); } /** * 按鈕等控件的初始化 */ public void init() { sView = (ScrollView) findViewById(R.id.mScrollView); openNetCard = (Button) findViewById(R.id.openNetCard); closeNetCard = (Button) findViewById(R.id.closeNetCard); checkNetCardState = (Button) findViewById(R.id.checkNetCardState); scan = (Button) findViewById(R.id.scan); getScanResult = (Button) findViewById(R.id.getScanResult); scanResult = (TextView) findViewById(R.id.scanResult); connect = (Button) findViewById(R.id.connect); disconnect = (Button) findViewById(R.id.disconnect); checkNetWorkState = (Button) findViewById(R.id.checkNetWorkState); openNetCard.setOnClickListener(Main.this); closeNetCard.setOnClickListener(Main.this); checkNetCardState.setOnClickListener(Main.this); scan.setOnClickListener(Main.this); getScanResult.setOnClickListener(Main.this); connect.setOnClickListener(Main.this); disconnect.setOnClickListener(Main.this); checkNetWorkState.setOnClickListener(Main.this); } /** * WIFI_STATE_DISABLING 0 WIFI_STATE_DISABLED 1 WIFI_STATE_ENABLING 2 * WIFI_STATE_ENABLED 3 */ public void openNetCard() { mWifiAdmin.openNetCard(); } public void closeNetCard() { mWifiAdmin.closeNetCard(); } public void checkNetCardState() { mWifiAdmin.checkNetCardState(); } public void scan() { mWifiAdmin.scan(); } public void getScanResult() { mScanResult = mWifiAdmin.getScanResult(); scanResult.setText(mScanResult); } public void connect() { mWifiAdmin.connect(); // startActivityForResult(new Intent( // android.provider.Settings.ACTION_WIFI_SETTINGS), 0); startActivity(new Intent(android.provider.Settings.ACTION_WIFI_SETTINGS)); } public void disconnect() { mWifiAdmin.disconnectWifi(); } public void checkNetWorkState() { mWifiAdmin.checkNetWorkState(); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.openNetCard: openNetCard(); break; case R.id.closeNetCard: closeNetCard(); break; case R.id.checkNetCardState: checkNetCardState(); break; case R.id.scan: scan(); break; case R.id.getScanResult: getScanResult(); break; case R.id.connect: connect(); break; case R.id.disconnect: disconnect(); break; case R.id.checkNetWorkState: checkNetWorkState(); break; default: break; } } } Wifi工具類：
package org.sunchao; import java.util.List; import android.content.Context; 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; import android.util.Log; public class WifiAdmin { private final static String TAG = "WifiAdmin"; private StringBuffer mStringBuffer = new StringBuffer(); private List<ScanResult> listResult; private ScanResult mScanResult; // 定義WifiManager對象 private WifiManager mWifiManager; // 定義WifiInfo對象 private WifiInfo mWifiInfo; // 網絡連接列表 private List<WifiConfiguration> mWifiConfiguration; // 定義一個WifiLock WifiLock mWifiLock; /** * 構造方法 */ public WifiAdmin(Context context) { mWifiManager = (WifiManager) context .getSystemService(Context.WIFI_SERVICE); mWifiInfo = mWifiManager.getConnectionInfo(); } /** * 打開Wifi網卡 */ public void openNetCard() { if (!mWifiManager.isWifiEnabled()) { mWifiManager.setWifiEnabled(true); } } /** * 關閉Wifi網卡 */ public void closeNetCard() { if (mWifiManager.isWifiEnabled()) { mWifiManager.setWifiEnabled(false); } } /** * 檢查當前Wifi網卡狀態 */ public void checkNetCardState() { if (mWifiManager.getWifiState() == 0) { Log.i(TAG, "網卡正在關閉"); } else if (mWifiManager.getWifiState() == 1) { Log.i(TAG, "網卡已經關閉"); } else if (mWifiManager.getWifiState() == 2) { Log.i(TAG, "網卡正在打開"); } else if (mWifiManager.getWifiState() == 3) { Log.i(TAG, "網卡已經打開"); } else { Log.i(TAG, "---_---暈......沒有獲取到狀態---_---"); } } /** * 掃描周邊網絡 */ public void scan() { mWifiManager.startScan(); listResult = mWifiManager.getScanResults(); if (listResult != null) { Log.i(TAG, "當前區域存在無線網絡，請查看掃描結果"); } else { Log.i(TAG, "當前區域沒有無線網絡"); } } /** * 得到掃描結果 */ public String getScanResult() { // 每次點擊掃描之前清空上一次的掃描結果 if (mStringBuffer != null) { mStringBuffer = new StringBuffer(); } // 開始掃描網絡 scan(); listResult = mWifiManager.getScanResults(); if (listResult != null) { for (int i = 0; i < listResult.size(); i++) { mScanResult = listResult.get(i); mStringBuffer = mStringBuffer.append("NO.").append(i + 1) .append(" :").append(mScanResult.SSID).append("->") .append(mScanResult.BSSID).append("->") .append(mScanResult.capabilities).append("->") .append(mScanResult.frequency).append("->") .append(mScanResult.level).append("->") .append(mScanResult.describeContents()).append("\n\n"); } } Log.i(TAG, mStringBuffer.toString()); return mStringBuffer.toString(); } /** * 連接指定網絡 */ public void connect() { mWifiInfo = mWifiManager.getConnectionInfo(); } /** * 斷開當前連接的網絡 */ public void disconnectWifi() { int netId = getNetworkId(); mWifiManager.disableNetwork(netId); mWifiManager.disconnect(); mWifiInfo = null; } /** * 檢查當前網絡狀態 * * @return String */ public void checkNetWorkState() { if (mWifiInfo != null) { Log.i(TAG, "網絡正常工作"); } else { Log.i(TAG, "網絡已斷開"); } } /** * 得到連接的ID */ public int getNetworkId() { return (mWifiInfo == null) ? 0 : mWifiInfo.getNetworkId(); } /** * 得到IP地址 */ public int getIPAddress() { return (mWifiInfo == null) ? 0 : mWifiInfo.getIpAddress(); } // 鎖定WifiLock public void acquireWifiLock() { mWifiLock.acquire(); } // 解鎖WifiLock public void releaseWifiLock() { // 判斷時候鎖定 if (mWifiLock.isHeld()) { mWifiLock.acquire(); } } // 創建一個WifiLock public void creatWifiLock() { mWifiLock = mWifiManager.createWifiLock("Test"); } // 得到配置好的網絡 public List<WifiConfiguration> getConfiguration() { return mWifiConfiguration; } // 指定配置好的網絡進行連接 public void connectConfiguration(int index) { // 索引大於配置好的網絡索引返回 if (index >= mWifiConfiguration.size()) { return; } // 連接配置好的指定ID的網絡 mWifiManager.enableNetwork(mWifiConfiguration.get(index).networkId, true); } // 得到MAC地址 public String getMacAddress() { return (mWifiInfo == null) ? "NULL" : mWifiInfo.getMacAddress(); } // 得到接入點的BSSID public String getBSSID() { return (mWifiInfo == null) ? "NULL" : mWifiInfo.getBSSID(); } // 得到WifiInfo的所有信息包 public String getWifiInfo() { return (mWifiInfo == null) ? "NULL" : mWifiInfo.toString(); } // 添加一個網絡並連接 public int addNetwork(WifiConfiguration wcg) { int wcgID = mWifiManager.addNetwork(mWifiConfiguration.get(3)); mWifiManager.enableNetwork(wcgID, true); return wcgID; } } AndroidManifest.xml:(注意需要添加的權限)
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="org.sunchao" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="8" /> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".Main" 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> <!-- 以下是使用wifi訪問網絡所需的權限 --> <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"></uses-permission> <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission> </manifest> 佈局文件就不貼了，我想看界面你都可以自己寫出來，如果有需要，這裏可以下載源代碼：http://download.csdn.net/source/3449837