正在从新得可运行类更新主线程[duplicate]

Question

我正在尝试动态更新主线程中的一个androidlinearlayout。

不幸的是，我很难从网上的教程中找到任何东西。它们似乎都没有提供线程之间如何通信的完整图片。

public class MainActivity extends AppCompatActivity {

    private LinearLayout layout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        layout = new LinearLayout(this);
        setContentView(layout);

        Updater updater = new Updater();
        Thread workerThread = new Thread(updater);
        //somehow update layout

public class Updater implements Runnable {

    private int count = 0;

    public Updater() {}

    @Override
    public void run()
    {
        for (int i = 0; i < 10; i ++){

            try {
                count++;
                TimeUnit.SECONDS.sleep(3);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

我希望避免匿名类，只要updater有新消息，就动态创建新的TextView。

Answer 1

1. 创建WorkerThreadListener接口:

public interface WorkerThreadListener {
    void onUpdate(int counter);
}

public class Updater implements Runnable {

    private final WorkerThreadListener mWorkerThreadListener;
    private final Handler mHandler;

    private int count = 0;

    public Updater(final WorkerThreadListener workerThreadListener) {
        this.mWorkerThreadListener = workerThreadListener;
        this.mHandler = new Handler();
    }

    @Override
    public void run() {
        for (int i = 0; i < 10; i++) {
            try {
                count++;
                mHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        mWorkerThreadListener.onUpdate(count);
                    }
                });
                TimeUnit.SECONDS.sleep(3);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

public class MainActivity extends AppCompatActivity {

    private LinearLayout layout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        layout = new LinearLayout(this);
        setContentView(layout);
        Updater updater = new Updater(new WorkerThreadListener() {
            @Override
            public void onUpdate(int counter) {
                //update layout here
            }
        });
        Thread workerThread = new Thread(updater);
        workerThread.start();
    }
}