在非 UI 线程中做一些 Android UI 的东西 [英] Do some Android UI stuff in non-UI thread

问题描述

有没有办法在非 UI 线程中进行 UI 更改?简短的问题.

Is there a way to do UI changes in a non-UI thread? Short question.

推荐答案

如果您不想使用 AsyncTask，请在您的主要活动中尝试带有内部类 (ResponseHandler) 的观察者模式，抱歉我无法正确设置格式，但是我确定你明白了

If you dont want to use an AsyncTask, try the observer pattern with an inner class (ResponseHandler) in your main activity, sorry I couldnt get the formatting right but im sure you get the idea

public class WorkerThread extends Observable implements Runnable {
public void run() {
    try {
            DoSomething();
            String response = "Doing something";
            setChanged();
            notifyObservers( response );
            DoSomethingElse();
            String response = "Doing something else";
            setChanged();
            notifyObservers( response );
    }
    catch (IOException e) {
        e.printStackTrace();
    }
}
private void DoSomething(){
}
private void DoSomethingElse(){
}


public class MainActivity{
public class ResponseHandler implements Observer {
    private String resp;
    public void update (Observable obj, Object arg) {
        if (arg instanceof String) {
            resp = (String) arg;
            //Write message to UI here ie System.out.println("
Received Response: "+ resp );
            //or EditText et = (EditText)findViewById(R.id.blah);
            // blah.SetText(resp);
        }
    }
}
private void doStuffAndReportToUI(){
    final WorkerThread wt = new WorkerThread();
    final ResponseHandler respHandler = new ResponseHandler();
    wt.addObserver( respHandler );
    Thread thread = new Thread(wt);
    thread.start();
}

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