Android开发学习
Android开发中，需要用到模仿QQ联系人的菜单展开收缩效果
新建布局文件：activity_two.xml，使用ExpandableListView控件，代码内容：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ExpandableListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ffffff"
android:cacheColorHint="#00000000"
android:listSelector="#00000000"
android:drawSelectorOnTop="false"
android:layout_weight="1"
android:groupIndicator="@null"
>
</ExpandableListView>
</LinearLayout>
实现的TwoActivity.java代码如下：
package com.zhengdecai.contractioninfo;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
/**
* 菜单展开收缩效果
*
* @author 郑德才
*
*/
public class TwoActivity extends Activity{
private int sign= -1;//控制列表的展开
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_two);
final ExpandableListAdapter adapter = new BaseExpandableListAdapter() {
//设置组视图的图片
int[] logos = new int[] { R.drawable.ic_launcher, R.drawable.ic_launcher,R.drawable.ic_launcher};
//设置组视图的显示文字
private String[] generalsTypes = new String[] { "魏", "蜀", "吴" };
//子视图显示文字
private String[][] generals = new String[][] {
{ "夏侯惇", "甄姬", "许褚", "郭嘉", "司马懿", "杨修" },
{ "马超", "张飞", "刘备", "诸葛亮", "黄月英", "赵云" },
{ "吕蒙", "陆逊", "孙权", "周瑜", "孙尚香" }
};
//子视图图片
public int[][] generallogos = new int[][] {
{ R.drawable.ic_launcher, R.drawable.ic_launcher,
R.drawable.ic_launcher, R.drawable.ic_launcher,
R.drawable.ic_launcher, R.drawable.ic_launcher },
{ R.drawable.ic_launcher, R.drawable.ic_launcher,
R.drawable.ic_launcher, R.drawable.ic_launcher,
R.drawable.ic_launcher, R.drawable.ic_launcher },
{ R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher,
R.drawable.ic_launcher, R.drawable.ic_launcher } };
//自己定义一个获得文字信息的方法
TextView getTextView() {
AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT, 64);
TextView textView = new TextView(
TwoActivity.this);
textView.setLayoutParams(lp);
textView.setGravity(Gravity.CENTER_VERTICAL);
textView.setPadding(5, 0, 0, 0);
textView.setTextSize(20);
textView.setTextColor(Color.BLACK);
return textView;
}
//重写ExpandableListAdapter中的各个方法
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
return generalsTypes.length;
}
@Override
public Object getGroup(int groupPosition) {
// TODO Auto-generated method stub
return generalsTypes[groupPosition];
}
@Override
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
return groupPosition;
}
@Override
public int getChildrenCount(int groupPosition) {
// TODO Auto-generated method stub
return generals[groupPosition].length;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return generals[groupPosition][childPosition];
}
@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 true;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
LinearLayout ll = new LinearLayout(
TwoActivity.this);
ll.setOrientation(0);
ImageView logo1 = new ImageView(TwoActivity.this);
logo1.setImageResource(R.drawable.lt_open);
if(!isExpanded){
logo1.setImageResource(R.drawable.lt_norml);
}
logo1.setPadding(10, 15, 0, 0);
ImageView logo = new ImageView(TwoActivity.this);
logo.setImageResource(logos[groupPosition]);
logo.setPadding(10, 0, 0, 0);
TextView textView = getTextView();
textView.setTextColor(Color.BLACK);
textView.setText(getGroup(groupPosition).toString());
ll.addView(logo1);
ll.addView(logo);
ll.addView(textView);
return ll;
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
LinearLayout ll = new LinearLayout(
TwoActivity.this);
ll.setOrientation(0);
ImageView generallogo = new ImageView(
TwoActivity.this);
generallogo
.setImageResource(generallogos[groupPosition][childPosition]);
ll.addView(generallogo);
TextView textView = getTextView();
textView.setText(getChild(groupPosition, childPosition)
.toString());
ll.addView(textView);
return ll;
}
@Override
public boolean isChildSelectable(int groupPosition,
int childPosition) {
// TODO Auto-generated method stub
return true;
}
};
final ExpandableListView expandableListView = (ExpandableListView) findViewById(R.id.list);
expandableListView.setAdapter(adapter);
expandableListView.setOnGroupExpandListener(new OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
// TODO Auto-generated method stub
for (int i = 0; i < adapter.getGroupCount(); i++) {
if (groupPosition != i) {
expandableListView.collapseGroup(i);
}
}
}
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
// TODO Auto-generated method stub
if (sign== -1) {
// 展开被选的group
expandableListView.expandGroup(groupPosition);
// 设置被选中的group置于顶端
expandableListView.setSelectedGroup(groupPosition);
sign= groupPosition;
} else if (sign== groupPosition) {
expandableListView.collapseGroup(sign);
sign= -1;
} else {
expandableListView.collapseGroup(sign);
// 展开被选的group
expandableListView.expandGroup(groupPosition);
// 设置被选中的group置于顶端
expandableListView.setSelectedGroup(groupPosition);
sign= groupPosition;
}
return true;
}
});
//设置item点击的监听器
expandableListView.setOnChildClickListener(new OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
Toast.makeText(
TwoActivity.this,
"你点击了" + adapter.getChild(groupPosition, childPosition),
Toast.LENGTH_SHORT).show();
return false;
}
});
}
}
模拟器运行效果图：
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