android 实现QQ好友列表

在某些Android开发群里，看到有些新手问怎么实现QQ好友列表，其实网上一搜挺多的。接触Android，也才一年的时间，大部分时间花在工作上（解bug。。。），界面上开发很少参与。自己维护的系统应用里，有个ExpandableListView的界面（其实android例子APIDemo也有类似的例子）就在这里写个Demo供新手参考。        ExpandableListView的用法：难点就是重写BaseExpandableListAdapter及提供的数据源。

        下面看看继承BaseExpandableListAdapter的适配器：

代码片段，双击复制
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
<SPAN xmlns="http://www.w3.org/1999/xhtml">package com.xyz.expande;
  
import java.util.List;
  
import android.app.AlertDialog;
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 ExpandAdapter extends BaseExpandableListAdapter {
  
    private Context mContext;
    private LayoutInflater mInflater = null;
    private String[]   mGroupStrings = null;
    private List<List<Item>>   mData = null;
  
    public ExpandAdapter(Context ctx, List<List<Item>> list) {
        mContext = ctx;
        mInflater = (LayoutInflater) mContext
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        mGroupStrings = mContext.getResources().getStringArray(R.array.groups);
        mData = list;
    }
  
    public void setData(List<List<Item>> list) {
        mData = list;
    }
  
    @Override
    public int getGroupCount() {
        // TODO Auto-generated method stub
        return mData.size();
    }
  
    @Override
    public int getChildrenCount(int groupPosition) {
        // TODO Auto-generated method stub
        return mData.get(groupPosition).size();
    }
  
    @Override
    public List<Item> getGroup(int groupPosition) {
        // TODO Auto-generated method stub
        return mData.get(groupPosition);
    }
  
    @Override
    public Item getChild(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return mData.get(groupPosition).get(childPosition);
    }
  
    @Override
    public long getGroupId(int groupPosition) {
        // TODO Auto-generated method stub
        return groupPosition;
    }
  
    @Override
    public long getChildId(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return childPosition;
    }
  
    @Override
    public boolean hasStableIds() {
        // TODO Auto-generated method stub
        return false;
    }
  
    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.group_item_layout, null);
        }
        GroupViewHolder holder = new GroupViewHolder();
        holder.mGroupName = (TextView) convertView
                .findViewById(R.id.group_name);
        holder.mGroupName.setText(mGroupStrings[groupPosition]);
        holder.mGroupCount = (TextView) convertView
                .findViewById(R.id.group_count);
        holder.mGroupCount.setText("[" + mData.get(groupPosition).size() + "]");
        return convertView;
    }
  
    @Override
    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.child_item_layout, null);
        }
        ChildViewHolder holder = new ChildViewHolder();
        holder.mIcon = (ImageView) convertView.findViewById(R.id.img);
        holder.mIcon.setBackgroundResource(getChild(groupPosition,
                childPosition).getImageId());
        holder.mChildName = (TextView) convertView.findViewById(R.id.item_name);
        holder.mChildName.setText(getChild(groupPosition, childPosition)
                .getName());
        holder.mDetail = (TextView) convertView.findViewById(R.id.item_detail);
        holder.mDetail.setText(getChild(groupPosition, childPosition)
                .getDetail());
        return convertView;
    }
  
    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        <SPAN style="COLOR: #cc0000">/*很重要：实现ChildView点击事件，必须返回true*/
</SPAN>        return true;
    }
  
    private class GroupViewHolder {
        TextView mGroupName;
        TextView mGroupCount;
    }
  
    private class ChildViewHolder {
        ImageView mIcon;
        TextView mChildName;
  
</LinearLayout></SPAN></SPAN>


        TextView mDetail;
    }

}
</SPAN>[/mw_shl_code]

里面用到的有两个布局，GroupView（子list没展开的view）如图：  
<IGNORE_JS_OP>




布局group_item_layout.xml如下:

代码片段，双击复制
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
<SPAN xmlns="http://www.w3.org/1999/xhtml"><SPAN xmlns="http://www.w3.org/1999/xhtml"><?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="?android:attr/listPreferredItemHeight"
    android:orientation="horizontal" >
  
    <TextView
        android:id="@+id/group_name"
        android:layout_width="wrap_content"
        android:layout_height="?android:attr/listPreferredItemHeight"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:layout_marginLeft="35dip"
        android:gravity="center_vertical"
        android:singleLine="true" />
  
    <TextView
        android:id="@+id/group_count"
        android:layout_width="wrap_content"
        android:layout_height="?android:attr/listPreferredItemHeight"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:layout_marginLeft="5dip"
        android:gravity="center_vertical"
        android:singleLine="true"/>
  
</LinearLayout></SPAN></SPAN>



另外一个就是ChildView，本例仿QQ好友列表，如图：
<IGNORE_JS_OP>




布局child_item_layout.xml如下：

代码片段，双击复制
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
<SPAN xmlns="http://www.w3.org/1999/xhtml"><SPAN xmlns="http://www.w3.org/1999/xhtml"><?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="wrap_content"
    android:minHeight="@dimen/min_Height"
    <SPAN style="COLOR: #ff0000">android:descendantFocusability="blocksDescendants"
</SPAN>    android:orientation="horizontal" >
  
    <ImageButton
        android:id="@+id/img"
        android:layout_width="@dimen/image_width"
        android:layout_height="@dimen/image_width"
        android:layout_marginLeft="2dip"
        android:layout_marginRight="10dip"
        android:layout_gravity="center_vertical" />
  
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:descendantFocusability="blocksDescendants"
        android:orientation="vertical" >
  
        <TextView
            android:id="@+id/item_name"
            android:layout_width="wrap_content"
            android:layout_height="0.0dip"
            android:gravity="center_vertical"
            android:layout_weight="1" />
  
        <TextView
            android:id="@+id/item_detail"
            android:layout_width="wrap_content"
            android:layout_height="0.0dip"
            android:gravity="center_vertical"
            android:singleLine="true"
            android:ellipsize="end"
            android:layout_weight="1" />
          
    </LinearLayout>
  
</LinearLayout></SPAN></SPAN>




适配器弄好了，ExpandableListView就用系统的，现在只剩下显示的问题啦

先来几张效果图：

<IGNORE_JS_OP>

    <IGNORE_JS_OP>



<IGNORE_JS_OP>

   <IGNORE_JS_OP>



主Activity如下：

onChildClick

代码片段，双击复制
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
<SPAN xmlns="http://www.w3.org/1999/xhtml"><SPAN xmlns="http://www.w3.org/1999/xhtml">package com.xyz.expande;
  
import java.util.ArrayList;
import java.util.List;
  
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
  
public class HomeActivity extends Activity implements OnChildClickListener {
  
    private ExpandableListView mListView = null;
    private ExpandAdapter mAdapter = null;
    private List<List<Item>> mData = new ArrayList<List<Item>>();
  
    private int[] mGroupArrays = new int[] { 
            R.array.tianlongbabu,
            R.array.shediaoyingxiongzhuan, 
            R.array.shendiaoxialv };
  
    private int[] mDetailIds = new int[] { 
            R.array.tianlongbabu_detail,
            R.array.shediaoyingxiongzhuan_detail, 
            R.array.shendiaoxialv_detail };
  
    private int[][] mImageIds = new int[][] {
            { R.drawable.img_00, 
              R.drawable.img_01, 
              R.drawable.img_02 },
            { R.drawable.img_10, 
              R.drawable.img_11, 
              R.drawable.img_12,
              R.drawable.img_13, 
              R.drawable.img_14, 
              R.drawable.img_15,
              R.drawable.img_16 },
            { R.drawable.img_20,
              R.drawable.img_21 } };
  
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initData();
        mListView = new ExpandableListView(this);
        mListView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
                LayoutParams.FILL_PARENT));
        setContentView(mListView);
          
        mListView.setGroupIndicator(getResources().getDrawable(
                R.drawable.expander_floder));
        mAdapter = new ExpandAdapter(this, mData);
        mListView.setAdapter(mAdapter);
        mListView
                .setDescendantFocusability(ExpandableListView.FOCUS_AFTER_DESCENDANTS);
        mListView.setOnChildClickListener(this);
    }
  
    <SPAN style="COLOR: #ff0000">/*
     * ChildView 设置 布局很可能onChildClick进不来，要在 ChildView layout 里加上
     * android:descendantFocusability="blocksDescendants",
     * 还有isChildSelectable里返回true
     */
</SPAN>    @Override
    public boolean onChildClick(ExpandableListView parent, View v,
            int groupPosition, int childPosition, long id) {
        // TODO Auto-generated method stub
        Item item = mAdapter.getChild(groupPosition, childPosition);
        new AlertDialog.Builder(this)
                .setTitle(item.getName())
                .setMessage(item.getDetail())
                .setIcon(android.R.drawable.ic_menu_more)
                .setNegativeButton(android.R.string.cancel,
                        new OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog,
                                    int which) {
                                // TODO Auto-generated method stub
  
                            }
                        }).create().show();
        return true;
    }
  
    private void initData() {
        for (int i = 0; i < mGroupArrays.length; i++) {
            List<Item> list = new ArrayList<Item>();
            String[] childs = getStringArray(mGroupArrays<I>);
            String[] details = getStringArray(mDetailIds<I>);
            for (int j = 0; j < childs.length; j++) {
                Item item = new Item(mImageIds<I>[j], childs[j], details[j]);
                list.add(item);
            }
            mData.add(list);
        }
    }
  
    private String[] getStringArray(int resId) {
        return getResources().getStringArray(resId);
    }
  
}</SPAN></SPAN>




这这个demo的时候，想实现ChildView的点击事件，实现接口onChildClick，发现不进来，很尴尬。。。最后还是在网上找到答案了，第一，在适配器里isChildSelectable 必须返回true，第二，ChildView布局child_item_layout.xml最外层的layout设置个属性

细心的同学会发现 Item 是啥？也贴出来吧

代码片段，双击复制
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
package com.xyz.expande;
  
public class Item {
      
    private int resId;
    private String name;
    private String detail;
      
    public Item(int resId, String name, String detail) {
        this.resId  = resId;
        this.name   = name;
        this.detail = detail;
    }
      
    public void setImageId(int resId) {
        this.resId  = resId;
    }
      
    public int getImageId() {
        return resId;
    }
      
    public void setName(String name) {
        this.name   = name;
    }
      
    public String getName() {
        return name;
    }
      
    public void setDetail(String detail) {
        this.detail = detail;
    }
      
    public String getDetail() {
        return detail;
    }
      
    public String toString() {
        return "Item[" + resId + ", " + name + ", " + detail + "]";
    }
  
}



源码下载： <IGNORE_JS_OP> ExpandeList.zip (670.11 KB, 下载次数: 988)

http://www.eoeandroid.com/forum.php?mod=misc&action=attachcredit&aid=81469&formhash=2f2ef89c

原文：http://blog.csdn.net/zhouyuanjing/article/details/8254421

posted @ 2013-12-14 17:48  Entropy_lxl  阅读(7596)  评论(1)    收藏  举报