使用AsyncTask的类平行operationand显示进度条 [英] using AsyncTask class for parallel operationand displaying a progress bar

问题描述

我使用显示任务异步类simulatneously并行操作的进度条，我想要从另一个类的函数，需要一些时间来返回字符串数组的字符串数组。

的问题是，当我放置在这样做backgroung AsyncTask的类的功能的函数呼叫，它在这样的背景提供了一个错误，并提供作为倾斜更改UI做背景..消息

因此​​，我把函数调用后执行的AsyncTask类的方法。它不列入给出一个错误，但进度条后，已经达到了100％，然后屏幕变黑，并需要一定的时间来启动新的活动。

我怎么能显示进度条，使函数调用simultaneously.??plz帮助下，米遇险

这里是code

 包com.integrated.mpr;进口android.app.Activity;
进口android.app.ProgressDialog;
进口android.content.Intent;
进口android.os.AsyncTask;
进口android.os.Bundle;
进口android.os.Handler;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.widget.Button;公共类陆侃扩展活动实现OnClickListener {    静态的String [] =显示新的String [Choose.n]
    按钮bprogress;    @覆盖
    保护无效的onCreate（捆绑savedInstanceState）{
        // TODO自动生成方法存根
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.progress）;
        bprogress =（按钮）findViewById（R.id.bProgress）;
        bprogress.setOnClickListener（本）;
    }    @覆盖
    公共无效的onClick（视图v）{
        // TODO自动生成方法存根        开关（v.getId（））{
        案例R.id.bProgress：
            字符串x =ABC;
            新loadSomeStuff（）执行（x）;
            打破;
        }
    }    公共类loadSomeStuff扩展的AsyncTask＆LT;字符串，整数，字符串＆GT; {        ProgressDialog对话框;
        在preExecute保护无效（）{
            对话框=新ProgressDialog（Progess.this）;
            dialog.setProgressStyle（ProgressDialog.STYLE_HORIZONTAL）;
            dialog.setMax（100）;
            dialog.show（）;
        }
        @覆盖
        保护字符串doInBackground（字符串...为arg0）{
            // TODO自动生成方法存根            的for（int i = 0; I＆LT; 40;我++）{
                publishProgress（5）;                尝试{
                    视频下载（1000）;
                }赶上（InterruptedException的E）{
                    // TODO自动生成catch块
                    e.printStackTrace（）;
                }
            }            dialog.dismiss（）;
            字符串Y =ABC;
            返回是;
        }        保护无效onProgressUpdate（整数...进度）{            dialog.incrementProgressBy（进展[0]）;
        }        保护无效onPostExecute（字符串结果）{
            显示=新逻辑（）FinalData的（）。
            意图openList =新意图（com.integrated.mpr.SENSITIVELIST）;
            startActivity（openList）;
        }
    }
}
 

解决方案

您不能驳回doInBackground（）对话框 - 甚至解雇一个对话框，需要UI任务。移动dialog.dismiss（）到的AsyncTask的onPostExecute（）。

I am displaying a progress bar using Async task class and simulatneously in parallel operation , i want to retrieve a string array from a function of another class that takes some time to return the string array.

The problem is that when i place the function call in doing backgroung function of AsyncTask class , it gives an error in Doing Background and gives the message as cant change the UI in doing Background ..

Therefore , i placed the function call in post Execute method of Asynctask class . It doesnot give an error but after the progress bar has reached 100% , then the screen goes black and takes some time to start the new activity.

How can i display the progress bar and make the function call simultaneously.??plz help , m in distress

here is the code

package com.integrated.mpr;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Progess extends Activity implements OnClickListener{



    static String[] display = new String[Choose.n];
    Button bprogress;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.progress);  
        bprogress = (Button) findViewById(R.id.bProgress);
        bprogress.setOnClickListener(this); 
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

        switch(v.getId()){
        case R.id.bProgress:        
            String x ="abc";    
            new loadSomeStuff().execute(x);     
            break;
        }
    }

    public class loadSomeStuff extends AsyncTask<String , Integer , String>{

        ProgressDialog dialog;
        protected void onPreExecute(){
            dialog = new ProgressDialog(Progess.this);
            dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            dialog.setMax(100);
            dialog.show();
        }
        @Override
        protected String doInBackground(String... arg0) {
            // TODO Auto-generated method stub

            for(int i = 0 ;i<40;i++){
                publishProgress(5);

                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }

            dialog.dismiss();
            String y ="abc";
            return y;
        }

        protected void onProgressUpdate(Integer...progress){

            dialog.incrementProgressBy(progress[0]);
        }

        protected void onPostExecute(String result){
            display = new Logic().finaldata();
            Intent openList = new Intent("com.integrated.mpr.SENSITIVELIST");
            startActivity(openList);    
        }
    }
}

解决方案

You can't dismiss the dialog in doInBackground() - even dismissing a dialog needs the UI task. Move dialog.dismiss() to onPostExecute() of the AsyncTask.

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