如何确保所有的语句被执行？ [英] How to make sure all statements are executed?

问题描述

如何确保在doInBackground线程（）方法已经完成或不？
我要完成我在doInBackground（已经开始的线程）方法postExecute被调用之前。

how to make sure that the thread in doInBackground() method has been completed or not ? I want to finish the thread which I have started in doInBackground() method before postExecute gets called.

package com.application.test;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;

public class MyActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        new MyTask().execute(null);
    }

    private class MyTask extends AsyncTask<Void, Void, Void>
    {

        protected static final String TAG = "Async";

        @Override
        protected Void doInBackground(Void... params) {
            // TODO Auto-generated method stub

            new Thread(new Runnable(){

                @Override
                public void run() {
                    // TODO Auto-generated method stub
                    for (int i = 0; i < 200; i++) {                     
                        Log.e(TAG, ""+i);                       
                    }
                }

            }).start();
            return null;
        }

      @Override
    protected void onPostExecute(Void result) {
        // TODO Auto-generated method stub
        super.onPostExecute(result);
        Log.e(TAG, "Post execute");
    }

    }
}

我要确保线程仅在doInBackground方法来完成。

I want to make sure that thread has to complete in doInBackground method only.

推荐答案

的问题是，你从里面doInbackground（）创建一个新的线程。

The problem is that you are creating a new thread from inside doInbackground().

不要到一般，请勿混用线程和AsyncTask的。更改code到

Don't to that and generally, don't mix Thread and AsyncTask. Change your code to

   @Override
    protected Void doInBackground(Void... params) {
        // TODO Auto-generated method stub

                for (int i = 0; i < 200; i++) {                     
                    Log.e(TAG, ""+i);                       
                }
        return null;
    }

这将确保在doInBackground（）所有code有onPostExecute（）之前完成被调用。

This will make sure that all code in doInBackground() has finished before onPostExecute() is called.

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