Android單例模式封裝HttpURLConnection網絡工具類

單例模式封裝網絡工具類

用途：通過封裝工具類和接口回調的方式來獲取網絡數據

//單例模式
public class NetUtils {
    private static final NetUtils ourInstance = new NetUtils();

    public static NetUtils getInstance() {
        return ourInstance;
    }

    private NetUtils() {
    }
    public void getDataFromService(String url){
        //向LoadData傳遞參數
        new LoadData().execute(url);
    }
//定義接口，接口回調
    public interface NetCallBack{
        void onSuccess(String result);
    }
    private NetCallBack netCallBack;

    public void setNetCallBack(NetCallBack netCallBack) {
        this.netCallBack = netCallBack;
    }
//具體實現解析的方法（此處直接返回了json）
    class LoadData extends AsyncTask<String,Void,String>{

        @Override
        protected String doInBackground(String... strings) {
            try {
                URL url = new URL(strings[0]);
                HttpURLConnection connection= (HttpURLConnection) url.openConnection();
                connection.setConnectTimeout(5000);

                connection.setConnectTimeout(5000);
                if (connection.getResponseCode()==HttpURLConnection.HTTP_OK){
                    return CharStreams.toString(new InputStreamReader(connection.getInputStream()));
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String s) {
            netCallBack.onSuccess(s);
        }
    }
}