Question

public void flashButton(int color) {
    final ImageView colors = findViewById(R.id.buttonsImage);
    final int newColor = color;

    Handler handler = new Handler();
    final Runnable r = new Runnable() {
        public void run() {
            if(newColor == 1)
                colors.setImageResource(R.drawable.green_activated_png);
            if(newColor == 2)
                colors.setImageResource(R.drawable.yellow_activated_png);
            if(newColor == 3)
                colors.setImageResource(R.drawable.red_activated_png);
            if(newColor == 4)
                colors.setImageResource(R.drawable.blue_activated_png);

            System.out.println("Flashed color: " + newColor);
        }
    };
    handler.postDelayed(r, 1000);

    colors.setImageResource(R.drawable.normal_buttons);
    System.out.println("Returned Color.");
}

使用R.drawable.green_activated_png更改每个按钮的按钮颜色。然后，我用（R.drawable.normal_buttons）将其改回来。我认为我的问题在handler.postDelayed（r，1000）中。但是，在用户按下正确的颜色后，颜色不会恢复正常。

Answer 1

你是在对面做的。你必须在按下之后立即更改Button的颜色，你必须将你的返回颜色保持在postDelayed以便在延迟之后给定时间它变成正常颜色。

public void flashButton(int color) {
    final ImageView colors = findViewById(R.id.buttonsImage);
    final int newColor = color;
    if(newColor == 1)
        colors.setImageResource(R.drawable.green_activated_png);
    if(newColor == 2)
        colors.setImageResource(R.drawable.yellow_activated_png);
    if(newColor == 3)
        colors.setImageResource(R.drawable.red_activated_png);
    if(newColor == 4)
        colors.setImageResource(R.drawable.blue_activated_png);
    System.out.println("Flashed color: " + newColor);

    Handler handler = new Handler();
    final Runnable r = new Runnable() {
        public void run() {
            colors.setImageResource(R.drawable.normal_buttons);
            System.out.println("Returned Color.");
        }
    };
    handler.postDelayed(r, 1000);
}

Answer 2

我认为该功能的流程不正确。因为后延迟方法在1秒后执行。在此之前，将执行colors.setImageResource（R.drawable.normal_buttons）方法。改变流程如下

public void flashButton(int color) {
final ImageView colors = findViewById(R.id.buttonsImage);
final int newColor = color;
        if(newColor == 1)
            colors.setImageResource(R.drawable.green_activated_png);
        if(newColor == 2)
            colors.setImageResource(R.drawable.yellow_activated_png);
        if(newColor == 3)
            colors.setImageResource(R.drawable.red_activated_png);
        if(newColor == 4)
            colors.setImageResource(R.drawable.blue_activated_png);

Handler handler = new Handler();
final Runnable r = new Runnable() {
    public void run() {
        colors.setImageResource(R.drawable.normal_buttons);
    }
};
handler.postDelayed(r, 1000);
}

西蒙说，按下按钮后，按钮颜色不会恢复正常

2 个答案: