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(); }
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