expandablelistview简单例子

Home / Android MrLee 2016-10-26 4260
效果还不错，还有浮动条。

20161026165320


源码
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package com.way.demo;
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewGroup.MarginLayoutParams;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AdapterView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.FrameLayout;
import android.widget.TextView;
public class IphoneExpandableListActivity extends Activity implements
        OnScrollListener {
    private static final String TAG = "iphone";
    private static final String PRE = "IphoneExpandableListActivity--";
    private ExpandableListView listView;
    private MyExpandableListAdapter mAdapter;
    private FrameLayout indicatorGroup;
    private int indicatorGroupId = -1;
    private int indicatorGroupHeight;
    private LayoutInflater mInflater;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        listView = (ExpandableListView) findViewById(R.id.expandableListView);
        indicatorGroup = (FrameLayout) findViewById(R.id.topGroup);
        // indicatorGroup.setVisibility(View.INVISIBLE);
        mAdapter = new MyExpandableListAdapter();
        listView.setAdapter(mAdapter);
        listView.setOnScrollListener(this);
        listView.setGroupIndicator(null);
        // copy group view to indicator Group
        mInflater.inflate(R.layout.list_item, indicatorGroup, true);
        for (int i = 0; i < mAdapter.getGroupCount(); i++) {
            listView.expandGroup(i);
        }
    }
    /**
     * A simple adapter which maintains an ArrayList of photo resource Ids. Each
     * photo is displayed as an image. This adapter supports clearing the list
     * of photos and adding a new photo.
     *
     */
    public class MyExpandableListAdapter extends BaseExpandableListAdapter {
        // Sample data set. children[i] contains the children (String[]) for
        // groups[i].
        private String[] groups = { "People Names", "Dog Names", "Cat Names",
                "Fish Names" };
        private String[][] children = {
                { "Way", "Arnold", "Barry", "Chuck", "David", "Afghanistan",
                        "Albania", "Belgium", "Lily", "Jim", "LiMing", "Jodan" },
                { "Ace", "Bandit", "Cha-Cha", "Deuce", "Bahamas", "China",
                        "Dominica", "Jim", "LiMing", "Jodan" },
                { "Fluffy", "Snuggles", "Ecuador", "Ecuador", "Jim", "LiMing",
                        "Jodan" },
                { "Goldy", "Bubbles", "Iceland", "Iran", "Italy", "Jim",
                        "LiMing", "Jodan" } };
        public Object getChild(int groupPosition, int childPosition) {
            return children[groupPosition][childPosition];
        }
        public long getChildId(int groupPosition, int childPosition) {
            return childPosition;
        }
        public int getChildrenCount(int groupPosition) {
            return children[groupPosition].length;
        }
        public TextView getGenericView() {
            // Layout parameters for the ExpandableListView
            AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT, 64);
            TextView textView = new TextView(IphoneExpandableListActivity.this);
            textView.setLayoutParams(lp);
            // Center the text vertically
            textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
            // Set the text starting position
            textView.setPadding(36, 0, 0, 0);
            textView.setTextColor(Color.BLACK);
            return textView;
        }
        public View getChildView(int groupPosition, int childPosition,
                boolean isLastChild, View convertView, ViewGroup parent) {
            TextView textView = getGenericView();
            textView.setText(getChild(groupPosition, childPosition).toString());
            return textView;
        }
        public Object getGroup(int groupPosition) {
            return groups[groupPosition];
        }
        public int getGroupCount() {
            return groups.length;
        }
        public long getGroupId(int groupPosition) {
            return groupPosition;
        }
        /**
         * create group view and bind data to view
         */
        public View getGroupView(int groupPosition, boolean isExpanded,
                View convertView, ViewGroup parent) {
            View v;
            if (convertView == null) {
                v = mInflater.inflate(R.layout.list_item, null);
            } else {
                v = convertView;
            }
            TextView textView = (TextView) v.findViewById(R.id.textView);
            textView.setText(getGroup(groupPosition).toString());
            return v;
        }
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            return true;
        }
        public boolean hasStableIds() {
            return true;
        }
    }
    /**
     * here is very importance for indicator group
     */
    public void onScroll(AbsListView view, int firstVisibleItem,
            int visibleItemCount, int totalItemCount) {
        final ExpandableListView listView = (ExpandableListView) view;
        /**
         * calculate point (0,0)
         */
        int npos = view.pointToPosition(0, 0);// 其实就是firstVisibleItem
        if (npos == AdapterView.INVALID_POSITION)// 如果第一个位置值无效
            return;
        long pos = listView.getExpandableListPosition(npos);
        int childPos = ExpandableListView.getPackedPositionChild(pos);// 获取第一行child的id
        int groupPos = ExpandableListView.getPackedPositionGroup(pos);// 获取第一行group的id
        if (childPos == AdapterView.INVALID_POSITION) {// 第一行不是显示child,就是group,此时没必要显示指示器
            View groupView = listView.getChildAt(npos
                    - listView.getFirstVisiblePosition());// 第一行的view
            indicatorGroupHeight = groupView.getHeight();// 获取group的高度
            indicatorGroup.setVisibility(View.GONE);// 隐藏指示器
        } else{
            indicatorGroup.setVisibility(View.VISIBLE);// 滚动到第一行是child，就显示指示器
        }
        // get an error data, so return now
        if (indicatorGroupHeight == 0) {
            return;
        }
        // update the data of indicator group view
        if (groupPos != indicatorGroupId) {// 如果指示器显示的不是当前group
            mAdapter.getGroupView(groupPos, listView.isGroupExpanded(groupPos),
                    indicatorGroup.getChildAt(0), null);// 将指示器更新为当前group
            indicatorGroupId = groupPos;
            Log.e(TAG, PRE + "bind to new group,group position = " + groupPos);
            // mAdapter.hideGroup(indicatorGroupId); // we set this group view
            // to be hided
            // 为此指示器增加点击事件
            indicatorGroup.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    listView.collapseGroup(indicatorGroupId);
                }
            });
        }
        if (indicatorGroupId == -1) // 如果此时grop的id无效，则返回
            return;
        /**
         * calculate point (0,indicatorGroupHeight) 下面是形成往上推出的效果
         */
        int showHeight = indicatorGroupHeight;
        int nEndPos = listView.pointToPosition(0, indicatorGroupHeight);// 第二个item的位置
        if (nEndPos == AdapterView.INVALID_POSITION)//如果无效直接返回
            return;
        long pos2 = listView.getExpandableListPosition(nEndPos);
        int groupPos2 = ExpandableListView.getPackedPositionGroup(pos2);//获取第二个group的id
        if (groupPos2 != indicatorGroupId) {//如果不等于指示器当前的group
            View viewNext = listView.getChildAt(nEndPos
                    - listView.getFirstVisiblePosition());
            showHeight = viewNext.getTop();
            Log.e(TAG, PRE + "update the show part height of indicator group:"
                    + showHeight);
        }
        // update group position
        MarginLayoutParams layoutParams = (MarginLayoutParams) indicatorGroup
                .getLayoutParams();
        layoutParams.topMargin = -(indicatorGroupHeight - showHeight);
        indicatorGroup.setLayoutParams(layoutParams);
    }
    public void onScrollStateChanged(AbsListView view, int scrollState) {
    }
}

xml
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<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <ExpandableListView
        android:id="@+id/expandableListView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </ExpandableListView>
    <FrameLayout
        android:id="@+id/topGroup"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >
    </FrameLayout>
</FrameLayout>

 
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<?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:orientation="vertical"
    android:background="@color/item_bg_color"
    android:paddingLeft="15dp" >
    android:background="@android:color/background_dark"
    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:paddingBottom="5dip"
        android:paddingLeft="15dp"
        android:paddingTop="5dip"
        android:textColor="@android:color/white"
        android:textSize="18sp"
        android:textStyle="bold" >
    </TextView>
</LinearLayout>

 

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