关于ExpandableListView用法的一个简单小例子

喜欢显示好友QQ那样的列表，可以展开，可以收起，在Android中，以往用的比较多的是listview，虽然可以实现列表的展示，但在某些情况下，我们还是希望用到可以分组并实现收缩的列表，那就要用到android的ExpandableListView，今天研究了一下这个的用法，也参考了很多资料动手写了一个小demo，实现了基本的功能，但界面优化方面做得还不够好，有待改进，素材采用了Q版三国杀武将的图片，很有爱哈哈，下面直接上效果图以及源代码~！







main.xml的布局很简单啦，只是一个ExpandableListView 就OK了

但值得简单说下的是 android:cacheColorHint=”#00000000”，这个设置可以去除拖动view时背景变成黑色的效果

android:listSelector=”#00000000” ，可以去除选中时的黄色底色

<code class="hljs xml has-numbering"><span class="hljs-tag"><<span class="hljs-title">LinearLayout</span> <span class="hljs-attribute">xmlns:android</span>=<span class="hljs-value">"http://schemas.android.com/apk/res/android"</span>
<span class="hljs-attribute">android:layout_width</span>=<span class="hljs-value">"fill_parent"</span>
<span class="hljs-attribute">android:layout_height</span>=<span class="hljs-value">"fill_parent"</span>
<span class="hljs-attribute">android:orientation</span>=<span class="hljs-value">"vertical"</span> ></span>
<span class="hljs-tag"><<span class="hljs-title">ExpandableListView</span>
<span class="hljs-attribute">android:id</span>=<span class="hljs-value">"@+id/list"</span>
<span class="hljs-attribute">android:layout_width</span>=<span class="hljs-value">"fill_parent"</span>
<span class="hljs-attribute">android:layout_height</span>=<span class="hljs-value">"fill_parent"</span>
<span class="hljs-attribute">android:background</span>=<span class="hljs-value">"#ffffff"</span>
<span class="hljs-attribute">android:cacheColorHint</span>=<span class="hljs-value">"#00000000"</span>
<span class="hljs-attribute">android:listSelector</span>=<span class="hljs-value">"#00000000"</span>
></span>
<span class="hljs-tag"></<span class="hljs-title">ExpandableListView</span>></span>
<span class="hljs-tag"></<span class="hljs-title">LinearLayout</span>></span></code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li></ul><div class="save_code tracking-ad" style="display: none;" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li></ul>

<code class="hljs java has-numbering"><span class="hljs-keyword">import</span> android.app.Activity;
<span class="hljs-keyword">import</span> android.graphics.Color;
<span class="hljs-keyword">import</span> android.os.Bundle;
<span class="hljs-keyword">import</span> android.view.Gravity;
<span class="hljs-keyword">import</span> android.view.View;
<span class="hljs-keyword">import</span> android.view.ViewGroup;
<span class="hljs-keyword">import</span> android.view.Window;
<span class="hljs-keyword">import</span> android.widget.AbsListView;
<span class="hljs-keyword">import</span> android.widget.BaseExpandableListAdapter;
<span class="hljs-keyword">import</span> android.widget.ExpandableListAdapter;
<span class="hljs-keyword">import</span> android.widget.ExpandableListView;
<span class="hljs-keyword">import</span> android.widget.ExpandableListView.OnChildClickListener;
<span class="hljs-keyword">import</span> android.widget.ImageView;
<span class="hljs-keyword">import</span> android.widget.LinearLayout;
<span class="hljs-keyword">import</span> android.widget.TextView;
<span class="hljs-keyword">import</span> android.widget.Toast;

<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ExpandableList</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Activity</span>{</span>

<span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onCreate</span>(Bundle savedInstanceState) {
<span class="hljs-comment">// TODO Auto-generated method stub  </span>
<span class="hljs-keyword">super</span>.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);

<span class="hljs-keyword">final</span> ExpandableListAdapter adapter = <span class="hljs-keyword">new</span> BaseExpandableListAdapter() {
<span class="hljs-comment">//设置组视图的图片  </span>
<span class="hljs-keyword">int</span>[] logos = <span class="hljs-keyword">new</span> <span class="hljs-keyword">int</span>[] { R.drawable.wei, R.drawable.shu,R.drawable.wu};
<span class="hljs-comment">//设置组视图的显示文字  </span>
<span class="hljs-keyword">private</span> String[] generalsTypes = <span class="hljs-keyword">new</span> String[] { <span class="hljs-string">"魏"</span>, <span class="hljs-string">"蜀"</span>, <span class="hljs-string">"吴"</span> };
<span class="hljs-comment">//子视图显示文字  </span>
<span class="hljs-keyword">private</span> String[][] generals = <span class="hljs-keyword">new</span> String[][] {
{ <span class="hljs-string">"夏侯惇"</span>, <span class="hljs-string">"甄姬"</span>, <span class="hljs-string">"许褚"</span>, <span class="hljs-string">"郭嘉"</span>, <span class="hljs-string">"司马懿"</span>, <span class="hljs-string">"杨修"</span> },
{ <span class="hljs-string">"马超"</span>, <span class="hljs-string">"张飞"</span>, <span class="hljs-string">"刘备"</span>, <span class="hljs-string">"诸葛亮"</span>, <span class="hljs-string">"黄月英"</span>, <span class="hljs-string">"赵云"</span> },
{ <span class="hljs-string">"吕蒙"</span>, <span class="hljs-string">"陆逊"</span>, <span class="hljs-string">"孙权"</span>, <span class="hljs-string">"周瑜"</span>, <span class="hljs-string">"孙尚香"</span> }

};
<span class="hljs-comment">//子视图图片  </span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">int</span>[][] generallogos = <span class="hljs-keyword">new</span> <span class="hljs-keyword">int</span>[][] {
{ R.drawable.xiahoudun, R.drawable.zhenji,
R.drawable.xuchu, R.drawable.guojia,
R.drawable.simayi, R.drawable.yangxiu },
{ R.drawable.machao, R.drawable.zhangfei,
R.drawable.liubei, R.drawable.zhugeliang,
R.drawable.huangyueying, R.drawable.zhaoyun },
{ R.drawable.lvmeng, R.drawable.luxun, R.drawable.sunquan,
R.drawable.zhouyu, R.drawable.sunshangxiang } };

<span class="hljs-comment">//自己定义一个获得文字信息的方法  </span>
TextView getTextView() {
AbsListView.LayoutParams lp = <span class="hljs-keyword">new</span> AbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT, <span class="hljs-number">64</span>);
TextView textView = <span class="hljs-keyword">new</span> TextView(
ExpandableList.<span class="hljs-keyword">this</span>);
textView.setLayoutParams(lp);
textView.setGravity(Gravity.CENTER_VERTICAL);
textView.setPadding(<span class="hljs-number">36</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>);
textView.setTextSize(<span class="hljs-number">20</span>);
textView.setTextColor(Color.BLACK);
<span class="hljs-keyword">return</span> textView;
}

<span class="hljs-comment">//重写ExpandableListAdapter中的各个方法  </span>
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">int</span> <span class="hljs-title">getGroupCount</span>() {
<span class="hljs-comment">// TODO Auto-generated method stub  </span>
<span class="hljs-keyword">return</span> generalsTypes.length;
}

<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> Object <span class="hljs-title">getGroup</span>(<span class="hljs-keyword">int</span> groupPosition) {
<span class="hljs-comment">// TODO Auto-generated method stub  </span>
<span class="hljs-keyword">return</span> generalsTypes[groupPosition];
}

<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">long</span> <span class="hljs-title">getGroupId</span>(<span class="hljs-keyword">int</span> groupPosition) {
<span class="hljs-comment">// TODO Auto-generated method stub  </span>
<span class="hljs-keyword">return</span> groupPosition;
}

<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">int</span> <span class="hljs-title">getChildrenCount</span>(<span class="hljs-keyword">int</span> groupPosition) {
<span class="hljs-comment">// TODO Auto-generated method stub  </span>
<span class="hljs-keyword">return</span> generals[groupPosition].length;
}

<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> Object <span class="hljs-title">getChild</span>(<span class="hljs-keyword">int</span> groupPosition, <span class="hljs-keyword">int</span> childPosition) {
<span class="hljs-comment">// TODO Auto-generated method stub  </span>
<span class="hljs-keyword">return</span> generals[groupPosition][childPosition];
}

<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">long</span> <span class="hljs-title">getChildId</span>(<span class="hljs-keyword">int</span> groupPosition, <span class="hljs-keyword">int</span> childPosition) {
<span class="hljs-comment">// TODO Auto-generated method stub  </span>
<span class="hljs-keyword">return</span> childPosition;
}

<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">hasStableIds</span>() {
<span class="hljs-comment">// TODO Auto-generated method stub  </span>
<span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>;
}

<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> View <span class="hljs-title">getGroupView</span>(<span class="hljs-keyword">int</span> groupPosition, <span class="hljs-keyword">boolean</span> isExpanded,
View convertView, ViewGroup parent) {
<span class="hljs-comment">// TODO Auto-generated method stub  </span>
LinearLayout ll = <span class="hljs-keyword">new</span> LinearLayout(
ExpandableList.<span class="hljs-keyword">this</span>);
ll.setOrientation(<span class="hljs-number">0</span>);
ImageView logo = <span class="hljs-keyword">new</span> ImageView(ExpandableList.<span class="hljs-keyword">this</span>);
logo.setImageResource(logos[groupPosition]);
logo.setPadding(<span class="hljs-number">50</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>);
ll.addView(logo);
TextView textView = getTextView();
textView.setTextColor(Color.BLACK);
textView.setText(getGroup(groupPosition).toString());
ll.addView(textView);

<span class="hljs-keyword">return</span> ll;
}

<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> View <span class="hljs-title">getChildView</span>(<span class="hljs-keyword">int</span> groupPosition, <span class="hljs-keyword">int</span> childPosition,
<span class="hljs-keyword">boolean</span> isLastChild, View convertView, ViewGroup parent) {
<span class="hljs-comment">// TODO Auto-generated method stub  </span>
LinearLayout ll = <span class="hljs-keyword">new</span> LinearLayout(
ExpandableList.<span class="hljs-keyword">this</span>);
ll.setOrientation(<span class="hljs-number">0</span>);
ImageView generallogo = <span class="hljs-keyword">new</span> ImageView(
ExpandableList.<span class="hljs-keyword">this</span>);
generallogo
.setImageResource(generallogos[groupPosition][childPosition]);
ll.addView(generallogo);
TextView textView = getTextView();
textView.setText(getChild(groupPosition, childPosition)
.toString());
ll.addView(textView);
<span class="hljs-keyword">return</span> ll;
}

<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">isChildSelectable</span>(<span class="hljs-keyword">int</span> groupPosition,
<span class="hljs-keyword">int</span> childPosition) {
<span class="hljs-comment">// TODO Auto-generated method stub  </span>
<span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>;
}

};

ExpandableListView expandableListView = (ExpandableListView) findViewById(R.id.list);
expandableListView.setAdapter(adapter);

<span class="hljs-comment">//设置item点击的监听器  </span>
expandableListView.setOnChildClickListener(<span class="hljs-keyword">new</span> OnChildClickListener() {

<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">onChildClick</span>(ExpandableListView parent, View v,
<span class="hljs-keyword">int</span> groupPosition, <span class="hljs-keyword">int</span> childPosition, <span class="hljs-keyword">long</span> id) {

Toast.makeText(
ExpandableList.<span class="hljs-keyword">this</span>,
<span class="hljs-string">"你点击了"</span> + adapter.getChild(groupPosition, childPosition),
Toast.LENGTH_SHORT).show();

<span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>;
}
});
}
}</code>