如何更改Runnable中方法的变量？

Question

我想做的是改变我的运行() 方法，这样它就可以接收不同的变量。我想将 player1life 更改为其他内容，以便我可以在不同的 player2life 上使用 customHandler.postDelayed(updateTimerThread, 0);。代码的作用是，当按下按钮时，变量会更改其值。

注意：我是 android 开发领域的新手。

final android.os.Handler  customHandler = new android.os.Handler();
    final Runnable updateTimerThread = new Runnable()
    {
        public void run()
        {   if(pressed) {
            player1life--;
            textView.setText(String.valueOf(player1life));
            customHandler.postDelayed(this, 100);
        }
        }
    };


    leftButton1.setOnTouchListener(new View.OnTouchListener() {

        @Override
        public boolean onTouch(View view, MotionEvent motionEvent) {


            switch (motionEvent.getAction()){
                case MotionEvent.ACTION_DOWN :
                    pressed = true;
                    customHandler.postDelayed(updateTimerThread, 0);
                    leftButton1.setImageResource(R.drawable.arrownewred);
                    winFunction();
                    break;
                case MotionEvent.ACTION_UP :
                    pressed = false;
                    leftButton1.setImageResource(R.drawable.arrownew); break;
            }
            return true;
        }
    });

Answer 1

我闻到了 XY 问题...

为什么不创建一个不同的 Runnable 来处理 player2life？在点击处理程序中，只需执行一个 if 语句来检查您应该减少哪些玩家的生命值！

if ... {
    customHandler.postDelayed(runnableThatHandlesPlayer1Life, 0);
} else {
    customHandler.postDelayed(runnableThatHandlesPlayer2Life, 0);
}

并且可以这样声明可运行对象：

final Runnable runnableThatHandlesPlayer1Life = new Runnable()
{
    public void run()
    {   if(pressed) {
        player1life--;
        textView.setText(String.valueOf(player1life));
        customHandler.postDelayed(this, 100);
    }
    }
};

final Runnable runnableThatHandlesPlayer2Life = new Runnable()
{
    public void run()
    {   if(pressed) {
        player2life--;
        textView.setText(String.valueOf(player2life));
        customHandler.postDelayed(this, 100);
    }
    }
};

但是您的代码有点可疑。根据我对您的代码的理解，当按下按钮时，player1 的生命将以每秒 10 次的速度减少。真奇怪。

您好像在尝试创建一个计时器之类的东西。试试我写的 Timer class 。它应该会让事情变得更容易一些：

import android.os.Handler;

public class Timer {
    private Handler handler;
    private boolean paused;

    private int interval;

    private Runnable task = new Runnable () {
        @Override
        public void run() {
            if (!paused) {
                runnable.run ();
                Timer.this.handler.postDelayed (this, interval);
            }
        }
    };

    private Runnable runnable;

    public int getInterval() {
        return interval;
    }

    public void setInterval(int interval) {
        this.interval = interval;
    }

    public void startTimer () {
        paused = false;
        handler.postDelayed (task, interval);
    }

    public void stopTimer () {
        paused = true;
    }

    public Timer (Runnable runnable, int interval, boolean started) {
        handler = new Handler ();
        this.runnable = runnable;
        this.interval = interval;
        if (started)
            startTimer ();
    }
}

Answer 2

问题是否只是超过了匿名内部 class 中对 final 变量的需求？如果是这样，您可以使用 "trick" 使用长度为 1 的最终数组，然后更新数组的元素。

这是一个简单的例子：

public interface Incrementer {

    void increment();

}

public class Foo {

    private int bar = 0;

    public int getBar() {
        return bar;
    }

    public void increment() {
        this.bar++;
        System.out.println("value is now: " + bar); 
    }


}

 public class Closure {

    public static void main(String[] args) {

        System.out.println("hello");
        Foo foo1 = new Foo();
        Foo foo2 = new Foo();

        final Foo[] theFoo = {foo1};

        Incrementer incrementer = new Incrementer() {

            public void increment() {
                theFoo[0].increment();

            }

        };

        incrementer.increment();
        incrementer.increment();
        incrementer.increment();
        theFoo[0] = foo2;
        incrementer.increment();
        incrementer.increment();
        System.out.println("foo1 = " + foo1.getBar());
        System.out.println("foo2 = " + foo2.getBar());

    }

}

如何更改Runnable中方法的变量？

How to change the variable of a method in Runnable?

android

runnable