android 實現QQ好友列表

時間  2019-12-01
標籤 android 實現 好友 列表 欄目 Android 简体版
原文   原文鏈接

在某些Android開發羣裏，看到有些新手問怎麼實現QQ好友列表，其實網上一搜挺多的。接觸Android，也才一年的時間，大部分時間花在工做上（解bug。。。），界面上開發不多參與。本身維護的系統應用裏，有個ExpandableListView的界面（其實android例子APIDemo也有相似的例子）就在這裏寫個Demo供新手參考。        ExpandableListView的用法：難點就是重寫BaseExpandableListAdapter及提供的數據源。

        下面看看繼承BaseExpandableListAdapter的適配器：

javascript

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<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：實現ChildView點擊事件，必須返回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]

裏面用到的有兩個佈局，GroupView（子list沒展開的view）如圖：  
<IGNORE_JS_OP>php




佈局group_item_layout.xml以下:

app

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<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>



另一個就是ChildView，本例仿QQ好友列表，如圖：
<IGNORE_JS_OP>ide




佈局child_item_layout.xml以下：

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<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>




適配器弄好了，ExpandableListView就用系統的，如今只剩下顯示的問題啦

先來幾張效果圖：

<IGNORE_JS_OP>

    <IGNORE_JS_OP>



<IGNORE_JS_OP>

   <IGNORE_JS_OP>



主Activity以下：

onChildClick

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<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 設置 佈局極可能onChildClick進不來，要在 ChildView layout 里加上
      * android:descendantFocusability="blocksDescendants",
      * 還有isChildSelectable裏返回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>




這這個demo的時候，想實現ChildView的點擊事件，實現接口onChildClick，發現不進來，很尷尬。。。最後仍是在網上找到答案了，第一，在適配器裏isChildSelectable 必須返回true，第二，ChildView佈局child_item_layout.xml最外層的layout設置個屬性

細心的同窗會發現 Item 是啥？也貼出來吧

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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 + "]" ;
    }
  
}



源碼下載： <IGNORE_JS_OP> ExpandeList.zip (670.11 KB, 下載次數: 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

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