直接上代碼。
1. 先自定義一個View 重寫ExpandableListView
package com.coustom.myex;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.FrameLayout;
import android.widget.AbsListView.OnScrollListener;
import android.widget.RelativeLayout;
public class QExListView extends ExpandableListView implements OnScrollListener {
private RelativeLayout _groupLayout;
public int _groupIndex = -1;
private ExpandableListAdapter _exAdapter;
@Override
public void setAdapter(ExpandableListAdapter adapter) {
super.setAdapter(adapter);
}
/**
* @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);// 這裡設定Gone 為了不讓它遮擋後面header
}
} else if (groupPos > _groupIndex) {
final FrameLayout fl = (FrameLayout) getParent();
_groupIndex = groupPos;
if (_groupLayout != null)
fl.removeView(_groupLayout);
_groupLayout = (RelativeLayout) getExpandableListAdapter()
.getGroupView(groupPos, true, null, null);
_groupLayout.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
collapseGroup(_groupIndex);
}
});
fl.addView(_groupLayout, fl.getChildCount(), new LayoutParams(
LayoutParams.FILL_PARENT, 50));
}
}
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
}
2. 設定Adapter
package com.coustom.myex;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class ExAdapter extends BaseExpandableListAdapter {
private ArrayList<String> group;
private ArrayList<List<String>> child;
public void initData() {
group = new ArrayList<String>();
child = new ArrayList<List<String>>();
setData("女人健康", new String[] { "運動健康", "潮流服飾", "美容健康", "減肥瘦身", "身體健康",
"飲食健康", "運動健康", "潮流服飾", "美容健康", "減肥瘦身", "身體健康", "飲食健康", "運動健康",
"潮流服飾", "美容健康", "減肥瘦身", "身體健康", "飲食健康" });
setData("女人養生", new String[] { "飲食養生", "運動養生", "健身養生", "冬季養生", "日常護理",
"運動健康", "潮流服飾", "美容健康", "減肥瘦身", "身體健康", "飲食健康", "運動健康", "潮流服飾",
"美容健康", "減肥瘦身", "身體健康", "飲食健康" });
setData("其他", new String[] { "愛美我在行", "保健一點通", "吃喝有門道", "生活小竅門" });
}
public void setData(String group, String[] child) {
this.group.add(group);
List<String> listChild = new ArrayList<String>();
for (int i = 0; i < child.length; i++) {
listChild.add(child[i]);
}
this.child.add(listChild);
}
Context mContext;
public ExAdapter(Context context) {
mContext = context;
initData();
}
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
return group.size();
}
@Override
public int getChildrenCount(int groupPosition) {
// 傳回的是對應group的child大小，不能将child的所有元素傳回
return child.get(groupPosition).size();
}
@Override
public Object getGroup(int groupPosition) {
// 根據groupPosition的索引值傳回group對象
return group.get(groupPosition);
}
@Override
public Object getChild(int groupPosition, int childPosition) {
// 根據groupPosition，childPosition索引值，傳回一個child對象
return child.get(groupPosition).get(childPosition);
}
@Override
public long getGroupId(int groupPosition) {
// 傳回groupPosition的id
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
// 傳回childPosition的id
return childPosition;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}
/*
* 回調方法 isExpanded 第一次打開的時候，是否顯二級菜單
*/
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
View view = LayoutInflater.from(mContext).inflate(
R.layout.ex_list_parent_item, parent, false);
// 可以在這裡填充布局
TextView textView = (TextView) view.findViewById(R.id.textView1);
ImageView imageView = (ImageView) view.findViewById(R.id.imageView1);
imageView.setPadding(0, 15, 0, 0);
textView.setText(group.get(groupPosition));
if (isExpanded) {
imageView.setImageResource(R.drawable.arrow_down);
} else {
imageView.setImageResource(R.drawable.arrow_right);
}
textView.setTextSize(25);
// textView.setPadding(30, 5, 0, 5);
return view;
}
// 在這裡是擷取二級list的
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
ViewHodler viewHodler = new ViewHodler();
// 可以在這裡填充布局
if (convertView == null) {
convertView = LayoutInflater.from(mContext).inflate(
R.layout.item_list_artlist, parent, false);
viewHodler.textView = (TextView) convertView
.findViewById(R.id.textView1);
convertView.setTag(viewHodler);
} else {
viewHodler = (ViewHodler) convertView.getTag();
}
viewHodler.textView
.setText(child.get(groupPosition).get(childPosition));
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
// 為false的時候，child不能點選
return true;
}
class ViewHodler {
TextView textView;
}
}
3. 引用
package com.coustom.myex;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Color;
import android.view.Menu;
public class MainActivity extends Activity {
private QExListView listView;
private ExAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (QExListView) findViewById(R.id.MyView);
listView.setCacheColorHint(new Color().GRAY);
adapter = new ExAdapter(getApplicationContext());
// listView.setOnChildClickListener(onChildClickListener);
listView.setAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
4. 引用剛才自定義的View activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:background="#dddddd"
android:layout_height="fill_parent"
android:orientation="vertical" >
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<com.coustom.myex.QExListView
android:id="@+id/MyView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:cacheColorHint="#000000"
android:fadingEdge="none"
android:groupIndicator="@null" >
</com.coustom.myex.QExListView>
</FrameLayout>
</LinearLayout> 5. 兩個自定義的 item
① ex_list_parent_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#CCCCCC"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="25dp"
android:layout_height="30dp"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="37dp"
android:paddingTop="5dp"
android:scaleType="center"
android:src="@drawable/arrow_right" />
</RelativeLayout> ② item_list_artlist.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_vertical"
android:orientation="horizontal"
android:background="#FAe3e3"
android:paddingLeft="20dp" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/expande_child_dian" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="5dp"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout> ![Java小案例——随機數猜測随機數猜測[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)