/**
* 自定义可以滑动的RelativeLayout, 类似于IOS的滑动删除页面效果，当我们要使用
* 此功能的时候，需要将该Activity的顶层布局设置为SildingFinishLayout，
* 然后需要调用setTouchView()方法来设置需要滑动的View
*
* @author xiaanming
*
* @bloghttp://blog.csdn.net/xiaanming
*
*/
publicclassSildingFinishLayout extendsRelativeLayout implements
OnTouchListener {
/**
* SildingFinishLayout布局的父布局
*/
privateViewGroup mParentView;
/**
* 处理滑动逻辑的View
*/
privateView touchView;
/**
* 滑动的最小距离
*/
privateint mTouchSlop;
/**
* 按下点的X坐标
*/
privateint downX;
/**
* 按下点的Y坐标
*/
privateint downY;
/**
* 临时存储X坐标
*/
privateint tempX;
/**
* 滑动类
*/
privateScroller mScroller;
/**
* SildingFinishLayout的宽度
*/
privateint viewWidth;
/**
* 记录是否正在滑动
*/
private boolean isSilding;
privateOnSildingFinishListener onSildingFinishListener;
private boolean isFinish;
publicSildingFinishLayout(Context context,AttributeSet attrs) {
this(context, attrs,0);
}
publicSildingFinishLayout(Context context,AttributeSet attrs,int defStyle) {
super(context, attrs, defStyle);
mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
mScroller = new Scroller(context);
}
@Override
protectedvoidonLayout(boolean changed,int l,int t,int r,int b) {
super.onLayout(changed, l, t, r, b);
if (changed) {
// 获取SildingFinishLayout所在布局的父布局
mParentView = (ViewGroup)this.getParent();
viewWidth = this.getWidth();
}
}
/**
* 设置OnSildingFinishListener, 在onSildingFinish()方法中finish Activity
*
* @param onSildingFinishListener
*/
publicvoidsetOnSildingFinishListener(
OnSildingFinishListener onSildingFinishListener) {
this.onSildingFinishListener= onSildingFinishListener;
}
/**
* 设置Touch的View
*
* @param touchView
*/
publicvoidsetTouchView(View touchView) {
this.touchView= touchView;
touchView.setOnTouchListener(this);
}
publicViewgetTouchView() {
return touchView;
}
/**
* 滚动出界面
*/
privatevoidscrollRight() {
final int delta = (viewWidth+ mParentView.getScrollX());
// 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item
mScroller.startScroll(mParentView.getScrollX(),0,-delta + 1, 0,
Math.abs(delta));
postInvalidate();
}
/**
* 滚动到起始位置
*/
privatevoidscrollOrigin() {
int delta= mParentView.getScrollX();
mScroller.startScroll(mParentView.getScrollX(),0,-delta, 0,
Math.abs(delta));
postInvalidate();
}
/**
* touch的View是否是AbsListView， 例如ListView, GridView等其子类
*
* @return
*/
private booleanisTouchOnAbsListView() {
return touchView instanceofAbsListView? true : false;
}
/**
* touch的view是否是ScrollView或者其子类
*
* @return
*/
private booleanisTouchOnScrollView() {
return touchView instanceofScrollView? true : false;
}
@Override
public booleanonTouch(View v,MotionEventevent) {
switch (event.getAction()) {
caseMotionEvent.ACTION_DOWN:
downX = tempX = (int)event.getRawX();
downY = (int)event.getRawY();
break;
caseMotionEvent.ACTION_MOVE:
int moveX= (int)event.getRawX();
int deltaX= tempX - moveX;
tempX = moveX;
if (Math.abs(moveX- downX) > mTouchSlop
&&Math.abs((int)event.getRawY()- downY) < mTouchSlop) {
isSilding = true;
// 若touchView是AbsListView，
// 则当手指滑动，取消item的点击事件，不然我们滑动也伴随着item点击事件的发生
if (isTouchOnAbsListView()) {
MotionEvent cancelEvent= MotionEvent.obtain(event);
cancelEvent
.setAction(MotionEvent.ACTION_CANCEL
| (event.getActionIndex()<< MotionEvent.ACTION_POINTER_INDEX_SHIFT));
v.onTouchEvent(cancelEvent);
}
}
if (moveX- downX >= 0 && isSilding) {
mParentView.scrollBy(deltaX,0);
// 屏蔽在滑动过程中ListView ScrollView等自己的滑动事件
if (isTouchOnScrollView()||isTouchOnAbsListView()) {
returntrue;
}
}
break;
caseMotionEvent.ACTION_UP:
isSilding = false;
if (mParentView.getScrollX()<=-viewWidth / 2) {
isFinish = true;
scrollRight();
} else {
scrollOrigin();
isFinish = false;
}
break;
}
// 假如touch的view是AbsListView或者ScrollView 我们处理完上面自己的逻辑之后
// 再交给AbsListView, ScrollView自己处理其自己的逻辑
if (isTouchOnScrollView()||isTouchOnAbsListView()) {
return v.onTouchEvent(event);
}
// 其他的情况直接返回true
returntrue;
}
@Override
publicvoidcomputeScroll() {
// 调用startScroll的时候scroller.computeScrollOffset()返回true，
if (mScroller.computeScrollOffset()) {
mParentView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
postInvalidate();
if (mScroller.isFinished()) {
if (onSildingFinishListener!=null&& isFinish) {
onSildingFinishListener.onSildingFinish();
}
}
}
}
publicinterfaceOnSildingFinishListener {
publicvoidonSildingFinish();
}
}
