AsyncTask实现异步请求

@人走茶凉

于 2019-03-03 19:39:58 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/weixin_43936526/article/details/88092494

本文介绍了一个Java工具类，用于检查设备的网络连接状态并从URL获取数据。通过使用WorkUtil类的方法，可以轻松地实现网络状态的判断及数据的异步获取，适用于Android应用程序开发。

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public class WorkUtil {

    public static  boolean isNetConnected(Context context){
        if (context != null) {
            ConnectivityManager manager= (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
           NetworkInfo info= manager.getActiveNetworkInfo();
            if (info != null) {
                return info.isConnected();
            }
        }
        return false;
    }
    public static String getData(String murl){
        try {
            URL url=new URL(murl);
            HttpURLConnection connection= (HttpURLConnection) url.openConnection();
            int code=connection.getResponseCode();
            if (code == 200) {
                InputStream inputStream=connection.getInputStream();
                BufferedReader reader=new BufferedReader(new InputStreamReader(inputStream));
                StringBuilder builder=new StringBuilder();
                String aa="";
                while ((aa=reader.readLine())!=null){
                    builder.append(aa);
                }
                return builder.toString();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }

    public interface MyAsyncTask{

        void getData(String str);
    }
    public static void MyTask(String murl, final MyAsyncTask myAsyncTask) {

        new AsyncTask<String,Void,String>(){

            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);
                myAsyncTask.getData(s);
            }

            @Override
            protected String doInBackground(String... strings) {
                return WorkUtil.getData(strings[0]);
            }
        }.execute(murl);
    }

}