从线程更新 textView

发布于 2024-10-25 03:17:00 字数 704 浏览 1 评论 0原文

在我的 OnCreate 方法中，我创建了一个监听传入消息的线程！

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！

原文

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?
}

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

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〃温暖了心ぐ 2024-11-01 03:17:00

Android 应用程序中对 UI 的任何更新都必须在 UI 线程中进行。如果您生成一个线程在后台工作，则必须在触摸视图之前将结果封送回 UI 线程。您可以使用 Handler 类来执行封送处理：

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，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，以帮助减轻每次您想要执行后台工作时生成新线程相关的一些成本。

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);
            }
        });
}

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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时光磨忆 2024-11-01 03:17:00

Android 使用处理程序和 sendMessage(msg) 支持消息传递并发。（也可以使用共享内存并发处理程序。）如果您希望线程在应用程序终止时终止，则一个技巧是调用 thread.setDaemon(true)。另一个技巧是只有一个处理程序，并在消息处理程序中使用 message.what 和 switch 语句来路由消息。

代码和代码

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