从线程更新textView [英] Update textView from thread

问题描述

在我的OnCreate方法中，我创建了一个侦听传入消息的线程！

In my OnCreate method I have created a thread that listens to incoming message!

In OnCreate() {

//Some code

myThread = new Thread() {

            @Override

            public void run() {

                receiveMyMessages();

            }
        };
myThread.start();

// Some code related to sending out by pressing button etc.

}

Then, receiveMyMessage() functions…

Public void receiveMyMessage()
{

//Receive the message and put it in String str;

str = receivedAllTheMessage();

// <<    here I want to be able to update this str to a textView. But, How?
}

我查看了这篇文章，但是它对我不起作用，没有运气！

I checked this article but it did not work for me, no luck!

推荐答案

在Android应用程序中对UI进行的任何更新都必须在UI线程中进行.如果您在后台生成线程以进行工作，则必须在触摸视图之前将结果编组回UI线程.您可以使用Handler类执行封送处理:

Any updates to the UI in an Android application must happen in the UI thread. If you spawn a thread to do work in the background you must marshal the results back to the UI thread before you touch a View. You can use the Handler class to perform the marshaling:

public class TestActivity extends Activity {
    // Handler gets created on the UI-thread
    private Handler mHandler = new Handler();

    // This gets executed in a non-UI thread:
    public void receiveMyMessage() {
        final String str = receivedAllTheMessage();
        mHandler.post(new Runnable() {
            @Override
            public void run() {
                // This gets executed on the UI thread so it can safely modify Views
                mTextView.setText(str);
            }
        });
}

AsyncTask类为您简化了许多细节，这也是您可以研究的内容.例如，我相信它为您提供了一个线程池，以帮助减轻每次您要进行后台工作时产生新线程所带来的一些成本.

The AsyncTask class simplifies a lot of the details for you and is also something you could look into. For example, I believe it provides you with a thread pool to help mitigate some of the cost associated with spawning a new thread each time you want to do background work.

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