用過快牙的朋友應(yīng)該知道它們在兩天設(shè)備之間傳輸文件的時候使用的是wifi熱點，然后另一臺便連接這個熱點再進(jìn)行傳輸。快牙傳輸速度驚人應(yīng)該跟它的這種機制有關(guān)系吧。不知道它的搜索機制是怎樣的，但我想應(yīng)該可以通過熱點的名字來進(jìn)行判斷吧。下面我們就來探討一下如何自動創(chuàng)建一個wifi熱點吧

創(chuàng)建wifi熱點首先需要手機支持，建議開發(fā)的哥們整個好點的手機，我們公司那些個山寨設(shè)備，幾近有一半是不支持熱點的；其實創(chuàng)建熱點很簡單，先獲取到wifi的服務(wù)，再配置熱點名稱、密碼等等，然后再通過反射打開它就OK了。

下面我們看看創(chuàng)建熱點的代碼實現(xiàn)：

package com.tel.lajoin.wifi.hotspot;
import java.lang.reflect.Method;
import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class HotspotActivity extends Activity {
  private WifiManager wifiManager;
  private Button open;
  private boolean flag=false;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    //獲取wifi管理服務(wù)
    wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
    open=(Button)findViewById(R.id.open_hotspot);
    //通過按鈕事件設(shè)置熱點
    open.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        //如果是打開狀態(tài)就關(guān)閉，如果是關(guān)閉就打開
        flag=!flag;
        setWifiApEnabled(flag);
      }
    });
  }
  // wifi熱點開關(guān)
  public boolean setWifiApEnabled(boolean enabled) {
    if (enabled) { // disable WiFi in any case
      //wifi和熱點不能同時打開，所以打開熱點的時候需要關(guān)閉wifi
      wifiManager.setWifiEnabled(false);
    }
    try {
      //熱點的配置類
      WifiConfiguration apConfig = new WifiConfiguration();
      //配置熱點的名稱(可以在名字后面加點隨機數(shù)什么的)
      apConfig.SSID = "YRCCONNECTION";
      //配置熱點的密碼
      apConfig.preSharedKey="12122112";
        //通過反射調(diào)用設(shè)置熱點
      Method method = wifiManager.getClass().getMethod(
          "setWifiApEnabled", WifiConfiguration.class, Boolean.TYPE);
      //返回?zé)狳c打開狀態(tài)
      return (Boolean) method.invoke(wifiManager, apConfig, enabled);
    } catch (Exception e) {
      return false;
    }
  }
}

布局就不寫了吧，就一按鈕，人人都知道的東西，寫了也沒啥意思。要實現(xiàn)文件傳輸，當(dāng)然我們還需要寫一個連接熱點的客戶端吧。連接熱點的流程首先是搜索熱點然后再判斷熱點是否符合規(guī)則然后再進(jìn)行連接。

package com.tel.lajoin.wifiscan; 
import java.util.ArrayList; 
import java.util.List; 
import android.app.Activity; 
import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.content.IntentFilter; 
import android.net.wifi.ScanResult; 
import android.net.wifi.WifiConfiguration; 
import android.net.wifi.WifiManager; 
import android.os.Bundle; 
public class MainActivity extends Activity { 
 private List<ScanResult> wifiList; 
 private WifiManager wifiManager; 
 private List<String> passableHotsPot; 
 private WifiReceiver wifiReceiver; 
 private boolean isConnected=false; 
 private Button connect; 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  init(); 
 } 
 /* 初始化參數(shù) */ 
 public void init() { 
  setContentView(R.layout.main); 
  connect=(Button)findViewById(R.id.connect); 
  wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE); 
  wifiReceiver = new WifiReceiver(); 
  //通過按鈕事件搜索熱點 
  connect.setOnClickListener(new View.OnClickListener() { 
   @Override 
   public void onClick(View v) { 
    wifiManager.startScan(); 
   } 
  });  
 } 
 /* 監(jiān)聽熱點變化 */ 
 private final class WifiReceiver extends BroadcastReceiver { 
  @Override 
  public void onReceive(Context context, Intent intent) { 
   wifiList = wifiManager.getScanResults(); 
   if (wifiList == null || wifiList.size() == 0 || isConnected) 
    return; 
   onReceiveNewNetworks(wifiList); 
  } 
 } 
 /*當(dāng)搜索到新的wifi熱點時判斷該熱點是否符合規(guī)格*/ 
 public void onReceiveNewNetworks(List<ScanResult> wifiList){ 
  passableHotsPot=new ArrayList<String>(); 
  for(ScanResult result:wifiList){ 
   System.out.println(result.SSID); 
   if((result.SSID).contains("YRCCONNECTION")) 
    passableHotsPot.add(result.SSID); 
  } 
  synchronized (this) { 
   connectToHotpot(); 
  } 
 } 
 /*連接到熱點*/ 
 public void connectToHotpot(){ 
  if(passableHotsPot==null || passableHotsPot.size()==0) 
   return; 
  WifiConfiguration wifiConfig=this.setWifiParams(passableHotsPot.get(0)); 
  int wcgID = wifiManager.addNetwork(wifiConfig); 
  boolean flag=wifiManager.enableNetwork(wcgID, true); 
  isConnected=flag; 
  System.out.println("connect success? "+flag); 
 } 
 /*設(shè)置要連接的熱點的參數(shù)*/ 
 public WifiConfiguration setWifiParams(String ssid){ 
  WifiConfiguration apConfig=new WifiConfiguration(); 
  apConfig.SSID="\""+ssid+"\""; 
  apConfig.preSharedKey="\"12122112\""; 
  apConfig.hiddenSSID = true; 
  apConfig.status = WifiConfiguration.Status.ENABLED; 
  apConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP); 
  apConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP); 
  apConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK); 
  apConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP); 
  apConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP); 
  apConfig.allowedProtocols.set(WifiConfiguration.Protocol.RSN); 
  return apConfig; 
 } 
 @Override 
 protected void onDestroy() { 
  super.onDestroy(); 
  /*銷毀時注銷廣播*/ 
  unregisterReceiver(wifiReceiver); 
 } 
}

代碼很簡單，而且都有注釋的，相信大伙兒能夠看明白。那就這樣吧，至于文件傳輸建議還是去看看socket相關(guān)的文章吧。

希望本文所述對大家Android程序設(shè)計有所幫助。

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