Android应用源码之自定义适配器的ExpandableListView-IT计算机-毕业设计.zip

package snowfox.expandable; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; public class ExpandableList extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ExpandableListView elv = (ExpandableListView)findViewById(R.id.expandableListView); //准备一级列表中显示的数据:2个一级列表,分别显示"group1"和"group2" List<Map<String, String>> groups = new ArrayList<Map<String, String>>(); Map<String, String> group1 = new HashMap<String, String>(); group1.put("group", "group1"); Map<String, String> group2 = new HashMap<String, String>(); group2.put("group", "group2"); groups.add(group1); groups.add(group2); //准备第一个一级列表中的二级列表数据:两个二级列表,分别显示"childData1"和"childData2" List<Map<String, String>> child1 = new ArrayList<Map<String, String>>(); Map<String, String> child1Data1 = new HashMap<String, String>(); child1Data1.put("child", "child1Data1"); Map<String, String> child1Data2 = new HashMap<String, String>(); child1Data2.put("child", "child1Data2"); child1.add(child1Data1); child1.add(child1Data2); //准备第二个一级列表中的二级列表数据:一个二级列表,显示"child2Data1" List<Map<String, String>> child2 = new ArrayList<Map<String, String>>(); Map<String, String> child2Data1 = new HashMap<String, String>(); child2Data1.put("child", "child2Data1"); child2.add(child2Data1); //用一个list对象保存所有的二级列表数据 List<List<Map<String, String>>> childs = new ArrayList<List<Map<String, String>>>(); childs.add(child1); childs.add(child2); ExpandableAdapter viewAdapter = new ExpandableAdapter(this, groups, childs); elv.setAdapter(viewAdapter); } //自定义的ExpandListAdapter class ExpandableAdapter extends BaseExpandableListAdapter { private Context context; List<Map<String, String>> groups; List<List<Map<String, String>>> childs; /* * 构造函数: * 参数1:context对象 * 参数2:一级列表数据源 * 参数3:二级列表数据源 */ public ExpandableAdapter(Context context, List<Map<String, String>> groups, List<List<Map<String, String>>> childs) { this.groups = groups; this.childs = childs; this.context = context; } @Override public Object getChild(int groupPosition, int childPosition) { return childs.get(groupPosition).get(childPosition); } @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } //获取二级列表的View对象 @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { @SuppressWarnings("unchecked") String text = ((Map<String, String>) getChild(groupPosition, childPosition)).get("child"); LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); //获取二级列表对应的布局文件, 并将其各元素设置相应的属性 LinearLayout linearLayout = (LinearLayout) layoutInflater.inflate(R.layout.child, null); TextView tv = (TextView) linearLayout.findViewById(R.id.childTo); tv.setText(text); ImageView imageView = (ImageView)linearLayout.findViewById(R.id.imageView01); imageView.setImageResource(R.drawable.abc); return linearLayout; } @Override public int getChildrenCount(int groupPosition) { return childs.get(groupPosition).size(); } @Override public Object getGroup(int groupPosition) { return groups.get(groupPosition); } @Override public int getGroupCount() { return groups.size(); } @Override public long getGroupId(int groupPosition) { return groupPosition; } //获取一级列表View对象 @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { String text = groups.get(groupPosition).get("group"); LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); //获取一级列表布局文件,设置相应元素属性 LinearLayout linearLayout = (LinearLayout) layoutInflater.inflate(R.layout.group, null); TextView textView = (TextView)linearLayout.findViewById(R.id.textView01); textView.setText(text); return linearLayout; } @Override public boolean hasStableIds() { return false; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return false; } } }