[Android实例] android 检测网络是否存在 [复制链接]

在开发过程中，尤其是在开发网络应用的时候，时常要判断手机的联网状态,及时的给用户友善的提示。我们登录market，在网络断开的时候会及时的弹出警告窗口，避免用户盲目的等待。这样的判断要贯穿在整个应用当中，在用户切换Activity，或者是后台service运行的时候都可能要用到。所以我们可以将判断的逻辑封装成一个方法，让其他Activity/service公用。public static boolean isNetworkAvailable( Activity mActivity ) {Context context = mActivity.getApplicationContext();ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);if (connectivity == null) {return false;} else {NetworkInfo[] info = connectivity.getAllNetworkInfo();if (info != null) {for (int i = 0; i < info.length; i++) {if (info.getState() == NetworkInfo.State.CONNECTED) {return true;}}}}return false;}/*** 检测网络是否存在*/public static void HttpTest(final Activity mActivity){if( !isNetworkAvailable( mActivity) ){AlertDialog.Builder builders = new AlertDialog.Builder(mActivity);builders.setTitle(“抱歉,暂时无法处理您的请求”);LayoutInflater _inflater = LayoutInflater.from(mActivity);View convertView = _inflater.inflate(R.layout.error,null);builders.setView(convertView);builders.setPositiveButton(“确定”,  new DialogInterface.OnClickListener(){public void onClick(DialogInterface dialog, int which){mActivity.finish();}});builders.show();}}备注:别忘记在mainfest.xml中添加  android.permission.ACCESS_NETWORK_STATE权限