AbsListView.LayoutParams lp=new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,64);
这句话的意思是 创建一个布局(LayoutParams)的实例 lp。
AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,64) 指定了该布局的宽和高;
-1代表LayoutParams.MATCH_PARENT,即该布局的尺寸将填满它的父控件;
-2代表LayoutParams.WRAP_CONTENT,即该布局的尺寸将为其自身内容的尺寸;
下面是BaseExpandableListAdapter的用法
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ExpandableListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:childIndicator="@drawable/ic_launcher"
/>
</LinearLayout>
package com.example.expandablelistview;
import android.app.Activity;
import android.app.ActionBar;
import android.app.Fragment;
import android.content.Context;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.os.Build;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//创建一个BaseExpandableListAdapter对象
ExpandableListAdapter adapter=new BaseExpandableListAdapter(){
int[] logos=new int[]{
R.drawable.p,R.drawable.z,R.drawable.t
};
private String[] armTypes=new String[]{
"神族兵种","虫族兵种","人族兵种"
};
private String[][] arms=new String[][]{
{"狂战士","龙骑士","黑暗圣堂","点兵"},
{"小狗","刺蛇","飞龙","自爆飞机"},
{"机枪兵","护士mm","幽灵"}
};
@Override
public int getGroupCount() {
return arms.length;
}
@Override
public int getChildrenCount(int groupPosition) {
return arms[groupPosition].length;
}
@Override
public Object getGroup(int groupPosition) {
return armTypes[groupPosition];
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return arms[groupPosition][childPosition];
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
LinearLayout ll=new LinearLayout(MainActivity.this);
ll.setOrientation(0);
ImageView logo=new ImageView(MainActivity.this);
logo.setImageResource(logos[groupPosition]);
ll.addView(logo);
TextView textView=getTextView();
textView.setText(getGroup(groupPosition).toString());
ll.addView(textView);
return ll;
}
private TextView getTextView(){
AbsListView.LayoutParams lp=new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,64);
TextView textView=new TextView(MainActivity.this);
textView.setLayoutParams(lp);
textView.setGravity(Gravity.CENTER_VERTICAL|Gravity.LEFT);
textView.setPadding(36, 0,0,0);
textView.setTextSize(20);
return textView;
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
TextView textView=getTextView();
textView.setText(getChild(groupPosition,childPosition).toString());
return textView;
}
@Override
public boolean isChildSelectable(int groupPosition,
int childPosition) {
return true;
}
};
ExpandableListView expandableView=(ExpandableListView) findViewById(R.id.list);
expandableView.setAdapter(adapter);
}
}