仿QQ好友列表 ExpandableListView

最新推荐文章于 2020-11-27 03:05:16 发布

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本文介绍了一种使用Android平台的ExpandableListView组件来模仿QQ好友列表效果的方法。通过具体的XML布局文件和Java代码示例，展示了如何创建一个多级列表视图，并详细解释了其数据绑定过程。

仿QQ好友列表的效果图

xml页面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

    <!--运用：如：QQ列表-->
    <ExpandableListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/expandablelistview_1"></ExpandableListView>

</LinearLayout>

Java代码

package com.example.app11;

import android.database.DataSetObserver;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

/**
 * Created by Administrator on 2017/6/8 0008.
 */

public class ExpandableListViewActivity extends AppCompatActivity {

    private ExpandableListView expandableListView;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.expandablelistview);
        expandableListView = (ExpandableListView) findViewById(R.id.expandablelistview_1);
        expandable expandable=new expandable();
        expandableListView.setAdapter(expandable);

    }

    class expandable implements ExpandableListAdapter {

        int logals[] = {R.drawable.dog, R.drawable.elephant, R.drawable.fish};
        String names[] = {"狗", "象", "鱼"};
        String content[][] = {{"狗1", "狗2", "狗3"}, {"象1", "象2", "象3"}, {"鱼1", "鱼2", "鱼3"}};

        @Override
        public void registerDataSetObserver(DataSetObserver observer) {
        }

        @Override
        public void unregisterDataSetObserver(DataSetObserver observer) {

        }

        @Override
        public int getGroupCount() {
            return names.length;
        }

        @Override
        public int getChildrenCount(int groupPosition) {
            return content[groupPosition].length;
        }

        @Override
        public Object getGroup(int groupPosition) {
            return names[groupPosition];
        }

        @Override
        public Object getChild(int groupPosition, int childPosition) {
            return content[groupPosition][childPosition];
        }

        @Override
        public long getGroupId(int groupPosition) {
            return groupPosition;
        }

        @Override
        public long getChildId(int groupPosition, int childPosition) {
            return childPosition;
        }

        @Override
        public boolean hasStableIds() {
            return true;
        }

        @Override
        public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
            LinearLayout ll = new LinearLayout(ExpandableListViewActivity.this);
            ll.setOrientation(LinearLayout.HORIZONTAL);
            ImageView logo = new ImageView(ExpandableListViewActivity.this);
            logo.setImageResource(logals[groupPosition]);
            logo.setPadding(36, 15, 0, 0);
            ll.addView(logo);
            TextView textView=getTextView();
            textView.setText(getGroup(groupPosition).toString());
            textView.setPadding(10,0,0,0);
            ll.addView(textView);
            return ll;
        }

        @Override
        public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

            TextView textView=getTextView();
            textView.setText(getChild(groupPosition,childPosition).toString());
            return textView;
        }

        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            return true;
        }

        @Override
        public boolean areAllItemsEnabled() {
            return false;
        }

        @Override
        public boolean isEmpty() {
            return false;
        }

        @Override
        public void onGroupExpanded(int groupPosition) {

        }

        @Override
        public void onGroupCollapsed(int groupPosition) {

        }

        @Override
        public long getCombinedChildId(long groupId, long childId) {
            return 0;
        }

        @Override
        public long getCombinedGroupId(long groupId) {
            return 0;
        }

        private TextView getTextView() {
            AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, 64);
            TextView textView = new TextView(ExpandableListViewActivity.this);
            textView.setLayoutParams(lp);
            textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
            textView.setPadding(36, 0, 0, 0);
            textView.setTextSize(20);
            return textView;
        }

    }
}