【Android】树形菜单、扩展下拉菜单BaseExpandableListAdapter、AbsListView

先看效果~



也就是BaseExpandableListAdapter、AbsListView类的使用，就不多说了..大牛留情...

就两个类。

ExpandLabel:

package com.yfz;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.ViewGroup.LayoutParams;
import android.widget.ExpandableListView;
import android.widget.ViewFlipper;
public class ExpandLabel extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

// 数据源
//标题
List<String> groupArray = new ArrayList<String>();
//子标题
List<List<String>> childArray = new ArrayList<List<String>>();
groupArray.add("第一章");
groupArray.add("第二章");
List<String> tempArray01 = new ArrayList<String>();
tempArray01.add("第1.1节");
tempArray01.add("第1.2节");
tempArray01.add("第1.3节");

List<String> tempArray02 = new ArrayList<String>();
tempArray02.add("第2.1节");
tempArray02.add("第2.2节");
tempArray02.add("第2.3节");

childArray.add(tempArray01);
childArray.add(tempArray02);

ExpandableListView expandableListView = new ExpandableListView(this);

ExpandableAdapter adapter = new ExpandableAdapter(this,groupArray,childArray);

expandableListView.setAdapter(adapter);

addContentView(expandableListView, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
}
}

树形菜单类，只要传两个List过来就可以直接使用了。

groupArray：表示一级菜单

childArray： 表示二级菜单

二级菜单相当于一个二维List，该List中存储的每个元素都是一个List。第一个元素对应一级菜单中第一个菜单的子项List，第二个元素对应一级菜单中第二个菜单的子项List，依次类推。

ExpandableAdapter：

]package com.yfz;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;
public class ExpandableAdapter extends BaseExpandableListAdapter {

private List<String> groupArray;
private List<List<String>> childArray;
private Activity activity;
public ExpandableAdapter(Activity a,List<String> groupArray,List<List<String>> childArray) {
activity = a;
this.groupArray = groupArray;
this.childArray = childArray;
}

@Override
public Object getChild(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return childArray.get(groupPosition).get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return childPosition;
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
String string = childArray.get(groupPosition).get(childPosition);
return getGenericView(string);
}
@Override
public int getChildrenCount(int groupPosition) {
// TODO Auto-generated method stub
return childArray.get(groupPosition).size();
}
@Override
public Object getGroup(int groupPosition) {
// TODO Auto-generated method stub
return groupArray.get(groupPosition);
}
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
return groupArray.size();
}
@Override
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
String string = groupArray.get(groupPosition);
return getGenericView(string);
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return false;
}

/****************************************以下为自定义方法*********************************************/
/**
* Children 's View
* @param string
* @return
*/
public TextView getGenericView(String string) {
AbsListView.LayoutParams layoutParams = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, 64);
TextView text = new TextView(activity);
text.setLayoutParams(layoutParams);
// Center the text vertically
text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
// Set the text starting position
text.setPadding(36, 0, 0, 0);
text.setText(string);
return text;
}
}