RepeatingImageButton

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对于很多游戏使用屏幕控制一般需要考虑长按事件，比如在动作类的游戏中需要长按发射武器，结合Android Button模型，我们实现一个带图片的Button的长按，为了更清晰的显示原理，Android开发网这里使用ImageButton作为基类

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public class RepeatingImageButton extends ImageButton {
private long mStartTime; //记录长按开始
private int mRepeatCount; //重复次数计数
private RepeatListener mListener;
private long mInterval = 500; //Timer触发间隔，即每0.5秒算一次按下

public RepeatingImageButton(Context context) {
      this(context, null);
}
public RepeatingImageButton(Context context, AttributeSet attrs) {
      this(context, attrs, android.R.attr.imageButtonStyle);
}
public RepeatingImageButton(Context context, AttributeSet attrs, int defStyle) {
      super(context, attrs, defStyle);
      setFocusable(true); //允许获得焦点
      setLongClickable(true); //启用长按事件
}

public void setRepeatListener(RepeatListener l, long interval) { //实现重复按下事件listener
      mListener = l;
      mInterval = interval;
}

@Override
public boolean performLongClick() {
      mStartTime = SystemClock.elapsedRealtime();
      mRepeatCount = 0;
      post(mRepeater);
      return true;
}

@Override
public boolean onTouchEvent(MotionEvent event) {
      if (event.getAction() == MotionEvent.ACTION_UP) { // 本方法原理同onKeyUp的一样，这里处理屏幕事件，下面的onKeyUp处理Android手机上的物理按键事件
            removeCallbacks(mRepeater);
          if (mStartTime != 0) {
              doRepeat(true);
              mStartTime = 0;
          }
      }
      return super.onTouchEvent(event);
}
//处理导航键事件的中键或轨迹球按下事件
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
      switch (keyCode) {
          case KeyEvent.KEYCODE_DPAD_CENTER:
          case KeyEvent.KEYCODE_ENTER:
              super.onKeyDown(keyCode, event);
              return true;
      }
      return super.onKeyDown(keyCode, event);
}
//当按键弹起通知长按结束
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
      switch (keyCode) {
      case KeyEvent.KEYCODE_DPAD_CENTER:
      case KeyEvent.KEYCODE_ENTER:

          removeCallbacks(mRepeater); //取消重复listener捕获
          if (mStartTime != 0) {
              doRepeat(true); //如果长按事件累计时间不为0则说明长按了
              mStartTime = 0; //重置长按计时器
          }
      }
      return super.onKeyUp(keyCode, event);
}

private Runnable mRepeater = new Runnable() { //在线程中判断重复
      public void run() {
          doRepeat(false);
          if (isPressed()) {
              postDelayed(this, mInterval); //计算长按后延迟下一次累加
          }
      }
};
private void doRepeat(boolean last) {
      long now = SystemClock.elapsedRealtime();
      if (mListener != null) {
          mListener.onRepeat(this, now - mStartTime, last ? -1 : mRepeatCount++);
      }
}
public class RepeatingImageButton extends ImageButton {
    private long mStartTime; //记录长按开始
    private int mRepeatCount; //重复次数计数
    private RepeatListener mListener;
    private long mInterval = 500; //Timer触发间隔，即每0.5秒算一次按下

    public RepeatingImageButton(Context context) {
        this(context, null);
    }
    public RepeatingImageButton(Context context, AttributeSet attrs) {
        this(context, attrs, android.R.attr.imageButtonStyle);
    }
    public RepeatingImageButton(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        setFocusable(true); //允许获得焦点
        setLongClickable(true); //启用长按事件
    }

    public void setRepeatListener(RepeatListener l, long interval) { //实现重复按下事件listener
        mListener = l;
        mInterval = interval;
    }

    @Override
    public boolean performLongClick() {
        mStartTime = SystemClock.elapsedRealtime();
        mRepeatCount = 0;
        post(mRepeater);
        return true;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_UP) { // 本方法原理同onKeyUp的一样，这里处理屏幕事件，下面的onKeyUp处理Android手机上的物理按键事件
              removeCallbacks(mRepeater);
            if (mStartTime != 0) {
                doRepeat(true);
                mStartTime = 0;
            }
        }
        return super.onTouchEvent(event);
    }
//处理导航键事件的中键或轨迹球按下事件
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        switch (keyCode) {
            case KeyEvent.KEYCODE_DPAD_CENTER:
            case KeyEvent.KEYCODE_ENTER:
                super.onKeyDown(keyCode, event);
                return true;
        }
        return super.onKeyDown(keyCode, event);
    }
//当按键弹起通知长按结束
    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        switch (keyCode) {
        case KeyEvent.KEYCODE_DPAD_CENTER:
        case KeyEvent.KEYCODE_ENTER:

            removeCallbacks(mRepeater); //取消重复listener捕获
            if (mStartTime != 0) {
                doRepeat(true); //如果长按事件累计时间不为0则说明长按了
                mStartTime = 0; //重置长按计时器
            }
        }
        return super.onKeyUp(keyCode, event);
    }

    private Runnable mRepeater = new Runnable() { //在线程中判断重复
        public void run() {
            doRepeat(false);
            if (isPressed()) {
                postDelayed(this, mInterval); //计算长按后延迟下一次累加
            }
        }
    };
    private void doRepeat(boolean last) {
        long now = SystemClock.elapsedRealtime();
        if (mListener != null) {
            mListener.onRepeat(this, now - mStartTime, last ? -1 : mRepeatCount++);
        }
    }

下面是重复Button Listener接口的定义，调用时在Button中先使用setRepeatListener()方法实现RepeatListener接口

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public interface RepeatListener {
        void onRepeat(View v, long duration, int repeatcount); //参数一为用户传入的Button对象，参数二为延迟的毫秒数，第三位重复次数回调。
}
    public interface RepeatListener {
            void onRepeat(View v, long duration, int repeatcount); //参数一为用户传入的Button对象，参数二为延迟的毫秒数，第三位重复次数回调。
    }
}

本类大家可以直接在自己的View中implements实现RepeatListener接口即可。

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/JavaTiger427/archive/2010/11/25/6034526.aspx