android关于网络

/**
  * 检测当前网络状态是否可用
  * 
  * @return
  */
 public boolean checkNet() {
  ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
  State mobile = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE)
    .getState();
  State wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI)
    .getState();
  // 移动网络
  if (mobile == State.CONNECTED || mobile == State.CONNECTING)
   return true;
  // wifi网络
  if (wifi == State.CONNECTED || wifi == State.CONNECTING)
   return true;
  return false;
 }

 @Override
 protected void onResume() {

  super.onResume();
  // 3秒后界面消失

 }
 /**
  * 网络不可用  进行网络设置
  */
 private void netWorkStatus() {
  AlertDialog.Builder b = new AlertDialog.Builder(this).setTitle(
    "没有可用的网络").setMessage("是否对网络进行设置？");
  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); // 如果在设置完成后需要再次进行操作，可以重写操作代码，在这里不再重写
    finish();
   }
  }).setNeutralButton("否", new DialogInterface.OnClickListener() {
   public void onClick(DialogInterface dialog, int whichButton) {
    dialog.cancel();
    System.exit(0);
   }
  }).show();

 }