• 侧滑菜单 
• 代码实现步骤 
  • [1]先画主页面 代码如下

 

• • [2]画菜单页面

 

• • [3]把共同的属性抽到一个style里面

 

• • [4] 通过include 把2个孩子加入到main_activity页面

 

• • [5]对孩子重新排版 重写onlayout方法

@Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        View main = getChildAt(0);        View child = getChildAt(1);        width = child.getMeasuredWidth();        child.layout(-width, t, l, b);        main.layout(l, t, r, b);    }

 

• • [6]让容器消费事件,就是重写onTouchEvent方法 处理手指按下 和移动的逻辑

 

@Override public boolean onTouchEvent(MotionEvent event) {
       switch (event.getAction()) {
           case MotionEvent.ACTION_DOWN:             downX = event.getX();             break;         case MotionEvent.ACTION_MOVE:             float moveX = event.getX();             distanceX = moveX - downX + currentLeft;             if (distanceX <= 0) {
                   distanceX = 0;             } else if (distanceX >= width) {
                   distanceX = width;             }             scrollToX((int) distanceX);             break;         case MotionEvent.ACTION_UP:             if (distanceX >= width / 2) {
                   currentLeft = width;             } else {
                   currentLeft = 0;             }             float startX = distanceX;             float endX = currentLeft;             startToend(startX, endX);             break;     }     return true; }

 

• • [7]处理手指抬起的逻辑

case MotionEvent.ACTION_UP:                if (distanceX >= width / 2) {                    currentLeft = width;                } else {                    currentLeft = 0;                }                float startX = distanceX;                float endX = currentLeft;                startToend(startX, endX);                break;

 

• • [8]让view 实现平滑滚动. Scroller 
    • [8.1]先获取scroller实例

scroller = new Scroller(getContext());

 

• • • [8.2] 模拟X轴滚动的数据

private void startToend(float startX, float endX) {        int sx = (int) startX;        int dx = (int) (endX - startX);        int time = dx * 15;        scroller.startScroll(sx, 0, dx, 0, time);        invalidate();    }

 

• • • [8.3] 取出模拟的数据

@Override    public void computeScroll() {        if (scroller.computeScrollOffset()) {            int currX = scroller.getCurrX();            scrollToX(currX);            invalidate();        }    }

 

• • [9].点击按钮实现菜单切换

public void switchMenu() {        int startX = 0;        if (currentLeft == 0) {            currentLeft = width;            startX = 0;        } else {            currentLeft = 0;            startX = width;        }        startToend(startX, currentLeft);    }

 

• • [10].处理事件冲突. 如果x轴移动的距离 > Y轴移动的距离就拦截事件

 

@Override    public boolean onInterceptHoverEvent(MotionEvent event) {        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                downX = event.getX();                downY = event.getY();                break;            case MotionEvent.ACTION_MOVE:                float moveX = event.getX();                float moveY = event.getY();                float distanceX = moveX - downX;                float distanceY = moveY - downY;                if (Math.abs(distanceX) > Math.abs(distanceY)) {                    return true;                }                break;            case MotionEvent.ACTION_UP:                break;        }        return false;    }

https://github.com/nangongyibin7219/Android_SlidingMenu