完全仿QQ好友列表,自定义ExpandableListView!
2012-04-07 17:51
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最近,需要做一个可展开的listview,不禁想起了ExpandableListView。但是,在写了一个简单的例子后,发现了问题:
ExpandableListView是又多个childList组成的。
当展开的childList过长,又需要打开其他的list时,用户只能先滚动到最上面关掉这个childList,才可能打开其他的childlist!
这样的用户体验很差。iPhone做的就很不错,QQ的好友列表顶端 也有类似的导航,显示当前gruop的标签,并且点击就可以关闭当前组,十分方便!
http://androiddada.iteye.com/
好了,今天就模仿做了这个,直接上图:
下面是页面的布局(其他无用的布局我已经去掉了):
Xml代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<com.customWidget.QExListView
android:choiceMode="singleChoice"
android:id="@+id/home_expandableListView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@id/head_line"
android:cacheColorHint="#00000000"
android:childDivider="@drawable/list_divider_line"
android:divider="@drawable/list_divider_line"
android:dividerHeight="1dip"
android:fadingEdge="none"
android:groupIndicator="@null" />
</FrameLayout>
</LinearLayout>
这里要说明的是:他的父控件一定要为FrameLayout。因为需要添加在ExpandableListView上层的小导航条!
下面是自定义组件QExListView 代码:
Java代码
public class QExListView extends ExpandableListView implements OnScrollListener {
@Override
public void setAdapter(ExpandableListAdapter adapter) {
// TODO Auto-generated method stub
super.setAdapter(adapter);
}
private LinearLayout _groupLayout;
public int _groupIndex = -1;
/**
* @param context
*/
public QExListView(Context context) {
super(context);
super.setOnScrollListener(this);
}
/**
* @param context
* @param attrs
*/
public QExListView(Context context, AttributeSet attrs) {
super(context, attrs);
super.setOnScrollListener(this);
}
/**
* @param context
* @param attrs
* @param defStyle
*/
public QExListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
super.setOnScrollListener(this);
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
if (_exAdapter == null)
_exAdapter = this.getExpandableListAdapter();
int ptp = view.pointToPosition(0, 0);
if (ptp != AdapterView.INVALID_POSITION) {
QExListView qExlist = (QExListView) view;
long pos = qExlist.getExpandableListPosition(ptp);
int groupPos = ExpandableListView.getPackedPositionGroup(pos);
int childPos = ExpandableListView.getPackedPositionChild(pos);
if (childPos < 0) {
groupPos = -1;
}
if (groupPos < _groupIndex) {
_groupIndex = groupPos;
if (_groupLayout != null){
_groupLayout.removeAllViews();
_groupLayout.setVisibility(GONE);//这里设置Gone 为了不让它遮挡后面header
}
} else if (groupPos > _groupIndex) {
final FrameLayout fl = (FrameLayout) getParent();
_groupIndex = groupPos;
if (_groupLayout != null)
fl.removeView(_groupLayout);
_groupLayout = (LinearLayout) getExpandableListAdapter()
.getGroupView(groupPos, true, null, null);
_groupLayout.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
collapseGroup(_groupIndex);
Home_Act._viewHandler.post(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
fl.removeView(_groupLayout);
fl.addView(_groupLayout, new LayoutParams(
LayoutParams.FILL_PARENT, 50));
}
});
}
});
fl.addView(_groupLayout,fl.getChildCount(), new LayoutParams(
LayoutParams.FILL_PARENT, 50));
}
}
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
}
所用的adapter与ExpandableListView一样,这里就不赘述了。
ExpandableListView是又多个childList组成的。
当展开的childList过长,又需要打开其他的list时,用户只能先滚动到最上面关掉这个childList,才可能打开其他的childlist!
这样的用户体验很差。iPhone做的就很不错,QQ的好友列表顶端 也有类似的导航,显示当前gruop的标签,并且点击就可以关闭当前组,十分方便!
http://androiddada.iteye.com/
好了,今天就模仿做了这个,直接上图:
下面是页面的布局(其他无用的布局我已经去掉了):
Xml代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<com.customWidget.QExListView
android:choiceMode="singleChoice"
android:id="@+id/home_expandableListView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@id/head_line"
android:cacheColorHint="#00000000"
android:childDivider="@drawable/list_divider_line"
android:divider="@drawable/list_divider_line"
android:dividerHeight="1dip"
android:fadingEdge="none"
android:groupIndicator="@null" />
</FrameLayout>
</LinearLayout>
这里要说明的是:他的父控件一定要为FrameLayout。因为需要添加在ExpandableListView上层的小导航条!
下面是自定义组件QExListView 代码:
Java代码
public class QExListView extends ExpandableListView implements OnScrollListener {
@Override
public void setAdapter(ExpandableListAdapter adapter) {
// TODO Auto-generated method stub
super.setAdapter(adapter);
}
private LinearLayout _groupLayout;
public int _groupIndex = -1;
/**
* @param context
*/
public QExListView(Context context) {
super(context);
super.setOnScrollListener(this);
}
/**
* @param context
* @param attrs
*/
public QExListView(Context context, AttributeSet attrs) {
super(context, attrs);
super.setOnScrollListener(this);
}
/**
* @param context
* @param attrs
* @param defStyle
*/
public QExListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
super.setOnScrollListener(this);
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
if (_exAdapter == null)
_exAdapter = this.getExpandableListAdapter();
int ptp = view.pointToPosition(0, 0);
if (ptp != AdapterView.INVALID_POSITION) {
QExListView qExlist = (QExListView) view;
long pos = qExlist.getExpandableListPosition(ptp);
int groupPos = ExpandableListView.getPackedPositionGroup(pos);
int childPos = ExpandableListView.getPackedPositionChild(pos);
if (childPos < 0) {
groupPos = -1;
}
if (groupPos < _groupIndex) {
_groupIndex = groupPos;
if (_groupLayout != null){
_groupLayout.removeAllViews();
_groupLayout.setVisibility(GONE);//这里设置Gone 为了不让它遮挡后面header
}
} else if (groupPos > _groupIndex) {
final FrameLayout fl = (FrameLayout) getParent();
_groupIndex = groupPos;
if (_groupLayout != null)
fl.removeView(_groupLayout);
_groupLayout = (LinearLayout) getExpandableListAdapter()
.getGroupView(groupPos, true, null, null);
_groupLayout.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
collapseGroup(_groupIndex);
Home_Act._viewHandler.post(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
fl.removeView(_groupLayout);
fl.addView(_groupLayout, new LayoutParams(
LayoutParams.FILL_PARENT, 50));
}
});
}
});
fl.addView(_groupLayout,fl.getChildCount(), new LayoutParams(
LayoutParams.FILL_PARENT, 50));
}
}
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
}
所用的adapter与ExpandableListView一样,这里就不赘述了。
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