android 是否连接网络

来源：互联网发布：云计算相关股票有哪些编辑：程序博客网时间：2024/05/19 02:24

/** 判断是否有网络 */
private boolean checkNetwork() {
  boolean flag = false;
  ConnectivityManager cwjManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
  if (cwjManager.getActiveNetworkInfo() != null)
   flag = cwjManager.getActiveNetworkInfo().isAvailable();
  if (!flag) {
   Builder b = new AlertDialog.Builder(this).setTitle("没有可用的网络").setMessage("请开启GPRS或WIFI网络连接");
   b.setPositiveButton("确定", 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("<span class=\"hilite\">android</span>.intent.action.VIEW");
     startActivity(mIntent);
    }
   }).setNeutralButton("取消", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int whichButton) {
     dialog.cancel();
    }
   }).create();
   b.show();
  }

return flag;
}

Android编程获取网络连接状态(3G/Wifi)及调用网络配置界面

/**
* 检测是否开启wify或gprs
* @param context
* @return
*/
public boolean checkNetwork(final Context context){
ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

        //mobile 3G Data Network
        State mobile = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();
        //wifi
        State wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();

        //如果3G网络和wifi网络都未连接，且不是处于正在连接状态则进入Network Setting界面由用户配置网络连接
        if(mobile==State.CONNECTED||mobile==State.CONNECTING)
            return true;
        if(wifi==State.CONNECTED||wifi==State.CONNECTING)
        return true;


        Builder b = new android.app.AlertDialog.Builder(context).setTitle("没有可用的网络").setMessage("请开启GPRS或WIFI网络连接");
  b.setPositiveButton("设置网络", new DialogInterface.OnClickListener() {
   public void onClick(DialogInterface dialog, int whichButton) {
    context.startActivity(new Intent(Settings.ACTION_WIRELESS_SETTINGS));//进入无线网络配置界面
//    context.startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS)); //进入手机中的wifi网络设置界面
   }
  }).setNeutralButton("取消", new DialogInterface.OnClickListener() {
   public void onClick(DialogInterface dialog, int whichButton) {
    dialog.cancel();
   }
  }).create();
  b.show();
  return false;

    }

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