Question

我在下面的代码中得到错误，说我必须实现至少一个继承的AsyncTask类方法，但我实现其中3个仍然会引发错误。有人在这段代码中看到任何问题

List<NameValuePair> login_details = new ArrayList<NameValuePair>();
new CheckUserValidation().execute(login_details);

class CheckUserValidation extends AsyncTask<List<NameValuePair>,Void,String>
{
    @Override
    protected void onPreExecute(){
        super.onPreExecute();
        pdialog = new ProgressDialog(RrdMainActivity.this);
        pdialog.setMessage("Validating user...");
        pdialog.setIndeterminate(false);
        pdialog.setCancelable(false);
        pdialog.show();
    }

    @Override
    protected String doInBackground(List<NameValuePair>... params) {
        List<NameValuePair> args;
        args=params[0];
        http_resp = httpparser.makeHttpRequest(url_validate_user, "GET", args);

        try
        {
            int success_code = http_resp.getInt(TagSuccess);
            if(success_code == 1)
            {
                return "valid";
            }
            else
            {
                return "invalid";
            }

        }catch(JSONException e){
            e.printStackTrace();
        }

        return "valid";
    }

    @Override
    protected void onPostExecute(String success_message){

        if (success_message == "valid")
        {
            pdialog.dismiss();
            Bundle b = new Bundle();
            b.putString("imessage", http_resp.toString());

            Intent i = new Intent(RrdMainActivity.this,AllClasses.class);
            i.putExtras(b);
            startActivity(i);
        }
        else
        {
            pdialog.setMessage("Invalid userid/password. please try again...");
            pdialog.setCanceledOnTouchOutside(true);

        }
    }

}

提前感谢：）

Answer 1

尝试添加 @覆盖在你的doInBackground函数之前

Answer 2

变化：

protected String doInBackground(List<NameValuePair> params) {

为：

protected String doInBackground(List<NameValuePair>... params) {

并添加：

@Override

Answer 3

你应该覆盖你的doInBbackground方法，就像这样

@Override
protected String doInBackground(List<NameValuePair> params)

此外，我建议您使用此库进行背景工作，让您的生活更轻松 https://github.com/Arasthel/AsyncJobLibrary

这很简单..

AsyncJob.doInBackground(new AsyncJob.OnBackgroundJob() {

    @Override
    public void doOnBackground() {
        startRecording();
    }
});

类型＆lt;＆gt;必须实现AsyncTask＆lt;＆gt; doInBackground

3 个答案: