android群英传笔记--第四章--ListView使用技巧（一）

设置项目间分割线

android：divider="android:color/darker_gray"
android:dividerHeight="10dp"
android:divider="@null"

隐藏ListView的滚动条

android：scrollbars="none"

取消ListView的Item点击效果

android:listSelector="#00000000"
android:listSelector="@android:color/transparent"

设置ListView需要显示在第几项

listView.setSelection(N);//需要显示的第N个Item
//实现平滑移动
mListView.smoothScrollBy(distance,duration);
mListView.smoothScrollByOffset(offset);
mListView.smoothScrollToPostion(index);

遍历所有条目

for(int i=0;i<mListView.getChildCount;i++){
View view=mListView.getChildAt(i);
}

ListView的监听

mListView.setOnTouchListener(){}

mListView.setOnTouchListener(myTouchListener ){}
View.OnTouchListener myTouchListener = new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mFirstY = event.getY();
break;
case MotionEvent.ACTION_MOVE:
mCurrentY = event.getY();
if (mCurrentY - mFirstY > mTouchSlop) {
direction = 0;// down
} else if (mFirstY - mCurrentY > mTouchSlop) {
direction = 1;// up
}
if (direction == 1) {
if (mShow) {
toolbarAnim(1);//hide
mShow = !mShow;
}
} else if (direction == 0) {
if (!mShow) {
toolbarAnim(0);//show
mShow = !mShow;
}
}
break;
case MotionEvent.ACTION_UP:
break;
}
return false;
}
};

滚动监听OnScrollListener

mListView.setOnScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState){
case AbsListView.OnScrollListener.SCROLL_STATE_IDLE://滑动停止时
break;
case AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL://正在滚动
break;
case AbsListView.OnScrollListener.SCROLL_STATE_FLING://惯性滑动
break;
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
//滚动时一直调用
//firstVisibleItem 第一个能看见的Item from 0
//当前能看见的item总数
//totalItemCount整个llistview的Item总数

}
});
//判断滚动到最后一行
if(firstVisibleItem+visibleItemCount==totalItemCount && totalItemCount>0){
//滚动到最后一行
}
//判断滑动方向
if(firstVisibleItem>lastVisibleItemPosition){
//上滑
}else if(firstVisibleItem<lastVisibleItemPosition){
//下滑
}
lastVisibleItemPosition =firstVisibleItem;
//获得可视区域内最后一个item的id
mListView.getLastVisiblePosition();
mListView.getFirstVisiblePosition();//第一个

具有弹性的ListView 仿iOS效果

public class FlexibleListView extends ListView {

private static int mMaxOverDistance = 50;
private Context mContext;

public FlexibleListView(Context context, AttributeSet attrs,
int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.mContext = context;
initView();
}

public FlexibleListView(Context context, AttributeSet attrs) {
super(context, attrs);
this.mContext = context;
initView();
}

public FlexibleListView(Context context) {
super(context);
this.mContext = context;
initView();
}

private void initView() {
DisplayMetrics metrics = mContext.getResources().getDisplayMetrics();
float density = metrics.density;
mMaxOverDistance = (int) (density * mMaxOverDistance);
}

@Override
protected boolean overScrollBy(int deltaX, int deltaY,
int scrollX, int scrollY,
int scrollRangeX, int scrollRangeY,
int maxOverScrollX, int maxOverScrollY,
boolean isTouchEvent) {
return super.overScrollBy(deltaX, deltaY,
scrollX, scrollY,
scrollRangeX, scrollRangeY,
maxOverScrollX, mMaxOverDistance,
isTouchEvent);
}
}