Android的：如何知道按钮不放 [英] Android: how to know if button is held down

问题描述

我玩Android上的游戏，我有一个函数MoveCharacter（INT方向）时，按钮是pressed

I am playing with a game on Android, and I have a function MoveCharacter (int direction) that moves an animated sprite when buttons are pressed

例如，当用户presses了，我有这个code：

For example, when user presses up I have this code:

 mControls.UpButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                mLevel.mCharAnimation.FrameUp();
            }           
        });

不过，我希望能够保持，只要用户保持按钮向下移动的字符。
出人意料的是，我还没有找到如何在Android中做到这一点。
是否有某种onButtonDownLister的？

However, I’d like to be able to keep moving the character as long as the user keeps the button down. Surprisingly, I have not found out how to do this in Android. Is there some kind of onButtonDownLister?

推荐答案

您需要使用<一个href=\"http://developer.android.com/reference/android/view/View.OnTouchListener.html\">OnTouchListener有对倒行为分开，向上和其他国家。

You need to use an OnTouchListener to have separate actions for down, up, and other states.

mControls.UpButton.setOnTouchListener(new OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        switch(event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            // Do something
            return true;
        case MotionEvent.ACTION_UP:
            // No longer down
            return true;
        }
        return false;
    }
});

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