Question

我没有完成取消Android应用中的进度条。我声明一个对象栏对象，并获取一个调用doInProgress函数的String，并向其传递一个名为v1的对象。当异步任务完成他的任务时，为什么进度条（出现）不会被解除为onPostExecute方法中的声明？

在我的活动中，我打电话给：

ProgressDialog pDialog;
response = new GetString(SecondActivity.this).execute(v1).get();

这是myAsync任务：

package com.gms;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;


public class GetString extends AsyncTask<VariablesTable, Void, String> {

        private Context context;

        public ProgressDialog pDialog;

        public GetString(Context c){
            context = c;
        }           

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(context);
            pDialog.setMessage("Loading..");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);
            pDialog.show();
        }


        protected void onPostExecute() {
            // dismiss the dialog once got all details
            if (pDialog.isShowing()){
                pDialog.dismiss();
            }
        }


        @Override
        protected String doInBackground(VariablesTable... obj) {
            // Making HTTP request
            InputStream is = null;

            try {
                    DefaultHttpClient httpClient = new DefaultHttpClient();
                    String paramString = URLEncodedUtils.format(obj[0].cat, "utf-8");
                    obj[0].url += "?" + paramString;
                    HttpGet httpGet = new HttpGet(obj[0].url);

                    HttpResponse httpResponse = httpClient.execute(httpGet);
                    HttpEntity httpEntity = httpResponse.getEntity();
                    is = httpEntity.getContent();          

            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

                BufferedReader reader = null;
                try {
                    reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
                } catch (UnsupportedEncodingException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                StringBuilder sb = new StringBuilder();
                String line = null;
                try {
                    while ((line = reader.readLine()) != null) {
                        sb.append(line + "\n");
                    }
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                try {
                    is.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                return sb.toString();
        }
    }

建议?? 提前致谢

Answer 1

我认为问题在于你启动ASyncTask的方式。

response = new GetString(SecondActivity.this).execute(v1).get();

如果您从UI线程调用它，它将阻止它。删除.get()部分，以便线程可以继续运行并正确执行onPreExecute和onPostExecute功能。

Answer 2

chck post执行，我怀疑它是否有效

尝试将onPostExecute（）更改为onPostExecute（String resp）

进度条不被驳回

2 个答案: