判斷Android的網路狀態

private boolean NetWorkStatus() {      
  boolean netSataus = false;      
  ConnectivityManager cwjManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);      
  cwjManager.getActiveNetworkInfo();       
  
  if (cwjManager.getActiveNetworkInfo() != null) {           
   netSataus = cwjManager.getActiveNetworkInfo().isAvailable();      
  }
  
  if (!netSataus){
   Builder b = new AlertDialog.Builder(this).setTitle("沒有可用的網路").setMessage("是否對網路進行設定？");           
   
   b.setPositiveButton("是", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int whichButton) {
     Intent mIntent = new Intent("/");
     ComponentName comp = new ComponentName("com.android.settings", "com.android.settings.WirelessSettings");                   
     mIntent.setComponent(comp);
     mIntent.setAction("android.intent.action.VIEW");
     startActivityForResult(mIntent,0);  // 如果在設定完成後需要再次進行操作，可以重寫作業碼，在這裡不再重寫 
    }
   }).setNeutralButton("否", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int whichButton) {
       dialog.cancel();
      }
   }).show();       
   }       
  return netSataus;  
 }