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

问题描述

在我的 OnCreate 方法中，我创建了一个监听传入消息的线程！

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?
}

我检查了 这篇文章，但它对我不起作用，不走运！

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

推荐答案

Android 应用程序中 UI 的任何更新都必须发生在 UI 线程中.如果您生成一个线程在后台执行工作，您必须在触摸视图之前将结果编组回 UI 线程.您可以使用 Handler 类来执行封送处理:

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 类为您简化了很多细节，也是您可以研究的.例如，我相信它为您提供了一个线程池，可以帮助您减少每次您想要执行后台工作时产生一个新线程的相关成本.

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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