android 獲取當前連接WIFI名稱的問題

我在程序內通過以下方法獲取當前連接的WIFI名稱(SSID)，這個也是網上找別人的，但在我程序內就獲取不到呢？

1、在AndroidManifest.xml文件內增加

2、在源代碼內通過以下函數獲取SSID

private?String?getSSid(){

WifiManager?wm?=?(WifiManager)?getSystemService(WIFI_SERVICE);

if(wm?!=?null){

WifiInfo?wi?=?wm.getConnectionInfo();

if(wi?!=?null){

String?s?=?wi.getSSID();

if(s.length()>2&&s.charAt(0)?==?'"'&&s.charAt(s.length()?-1)?==?'"'){

return?s.substring(0,s.length()-1);

}

}

}

return?"";

}

實際跟蹤時，發現wm不為null，但wi.getSSID()獲取到的是，wi的名稱是UNINITIALIZED，確認網絡是連接上的，是哪里沒有初始化還是什么原因？請高手指點；

------解決方案--------------------

下面是我剛剛實驗過的代碼：掃描所有可用的wifi，再改下應該就可以獲取到當前連接的，供參考，如果你改好了也告訴一下~

MainActivity.java

package?com.example.wifistudy;

import?java.text.SimpleDateFormat;

import?java.util.Date;

import?java.util.List;

import?android.app.Activity;

import?android.app.ActionBar;

import?android.app.Fragment;

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.WifiManager;

import?android.os.Bundle;

import?android.view.LayoutInflater;

import?android.view.Menu;

import?android.view.MenuItem;

import?android.view.View;

import?android.view.ViewGroup;

import?android.widget.TextView;

import?android.os.Build;

public?class?MainActivity?extends?Activity

{

TextView?mainText;

WifiManager?mainWifi;

WifiReceiver?receiverWifi;

List?wifiList;

StringBuilder?sb?=?new?StringBuilder();

@Override

protected?void?onCreate(Bundle?savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

if?(savedInstanceState?==?null)

{

getFragmentManager().beginTransaction()

.add(R.id.container,?new?PlaceholderFragment()).commit();

}

mainText?=?(TextView)?findViewById(R.id.mainText);

mainWifi?=?(WifiManager)?getSystemService(Context.WIFI_SERVICE);

receiverWifi?=?new?WifiReceiver();

registerReceiver(receiverWifi,?new?IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));

mainWifi.startScan();

mainText.setText("\\nStarting?Scan...\\n");

}

@Override

public?boolean?onCreateOptionsMenu(Menu?menu)

{

menu.add(0,?0,?0,?"Refresh");

//?Inflate?the?menu;?this?adds?items?to?the?action?bar?if?it?is?present.

getMenuInflater().inflate(R.menu.main,?menu);

return?true;

}

@Override

public?boolean?onOptionsItemSelected(MenuItem?item)

{

mainWifi.startScan();

mainText.setText("Starting?Scan");

//?Handle?action?bar?item?clicks?here.?The?action?bar?will

//?automatically?handle?clicks?on?the?Home/Up?button,?so?long

//?as?you?specify?a?parent?activity?in?AndroidManifest.xml.

int?id?=?item.getItemId();

if?(id?==?R.id.action_settings)

{

return?true;

}

return?super.onOptionsItemSelected(item);

}

protected?void?onPause()

{

unregisterReceiver(receiverWifi);

super.onPause();

}

protected?void?onResume()

{

registerReceiver(receiverWifi,?new?IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));

super.onResume();

}

/**

*?A?placeholder?fragment?containing?a?simple?view.

*/

public?static?class?PlaceholderFragment?extends?Fragment

{

public?PlaceholderFragment()

{

}

@Override

public?View?onCreateView(LayoutInflater?inflater,?ViewGroup?container,

Bundle?savedInstanceState)

{

View?rootView?=?inflater.inflate(R.layout.fragment_main,?container,

false);

return?rootView;

}

}

class?WifiReceiver?extends?BroadcastReceiver

{

public?void?onReceive(Context?c,?Intent?intent)

{

SimpleDateFormat????formatter????=???new????SimpleDateFormat????("yyyy年MM月dd日????HH:mm:ss?????");

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