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这一节我们介绍第三个用适配器的控件，ExpandableListView可折叠列表。这个控件可以实现我们在QQ中非常常见好友分组功能，ExpandableListView是ListView的子类，用法跟ListView差不多，下面我们来学习这个控件的基本使用：
常用属性：
实现ExpandableAdapter的三种方式：
在这里，我们使用的是第一种方式，自定义一个类，实现BaseExpandableListAdapter，下面看具体实现：
布局代码：
item_group
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/tv_group_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:layout_marginLeft="28dp"
android:layout_marginTop="10dp"
android:padding="8dp"
android:text="张三"
android:textColor="#000000"
android:textSize="16sp" />
</LinearLayout>
item_child
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal">
<ImageView
android:id="@+id/iv_child_icon"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_marginBottom="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:padding="2dp"
android:src="@mipmap/ic_launcher" />
<TextView
android:id="@+id/tv_child_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginLeft="5dp"
android:layout_marginTop="8dp"
android:text="子节点"
android:textColor="#330000"
android:textSize="12sp" />
</LinearLayout>
activity_main布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.expandablelistviewdemo.MainActivity">
<ExpandableListView
android:id="@+id/ex_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:childDivider="#E02D2F" />
</RelativeLayout>
自定义适配器代码：
package com.example.expandablelistviewdemo;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.List;
/**
* Created by Devin on 2016/7/12.
*/
public class CustomAdapter extends BaseExpandableListAdapter {
private List<Group> groupList;
private List<List<Child>> childList;
private Context mContext;
public CustomAdapter(Context mContext, List<Group> groupList, List<List<Child>> childList) {
this.mContext = mContext;
this.groupList = groupList;
this.childList = childList;
}
/**
* Gets the number of groups.
*
* @return
*/
@Override
public int getGroupCount() {
return groupList.size();
}
/**
* Gets the number of children in a specified group.
*
* @param i
* @return
*/
@Override
public int getChildrenCount(int i) {
return childList.get(i).size();
}
/**
* Gets the data associated with the given group
*
* @param i
* @return
*/
@Override
public Object getGroup(int i) {
return groupList.get(i);
}
/**
* Gets the data associated with the given child within the given group.
*
* @param i
* @param i1
* @return
*/
@Override
public Object getChild(int i, int i1) {
return childList.get(i).get(i1);
}
/**
* Gets the ID for the group at the given position.
*
* @param i
* @return
*/
@Override
public long getGroupId(int i) {
return i;
}
/**
* Gets the ID for the given child within the given group.
*
* @param i
* @param i1
* @return
*/
@Override
public long getChildId(int i, int i1) {
return i1;
}
/**
* Indicates whether the child and group IDs are stable across changes to the underlying data.
*
* @return
*/
@Override
public boolean hasStableIds() {
return false;
}
/**
* Gets a View that displays the given group
*
* @param i
* @param b
* @param view
* @param viewGroup
* @return
*/
@Override
public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {
GroupViewHolder groupViewHolder = null;
if (view == null) {
view = LayoutInflater.from(mContext).inflate(R.layout.item_group, viewGroup, false);
groupViewHolder = new GroupViewHolder();
groupViewHolder.tv_group_name = (TextView) view.findViewById(R.id.tv_group_name);
view.setTag(groupViewHolder);
} else {
groupViewHolder = (GroupViewHolder) view.getTag();
}
groupViewHolder.tv_group_name.setText(groupList.get(i).getGroupName());
return view;
}
/**
* Gets a View that displays the data for the given child within the given group.
*
* @param i
* @param i1
* @param b
* @param view
* @param viewGroup
* @return
*/
@Override
public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {
ChildViewHolder childViewHolder = null;
if (view == null) {
view = LayoutInflater.from(mContext).inflate(R.layout.item_child, viewGroup, false);
childViewHolder = new ChildViewHolder();
childViewHolder.iv_child_icon = (ImageView) view.findViewById(R.id.iv_child_icon);
childViewHolder.tv_child_name = (TextView) view.findViewById(R.id.tv_child_name);
view.setTag(childViewHolder);
} else {
childViewHolder = (ChildViewHolder) view.getTag();
}
childViewHolder.iv_child_icon.setImageResource(R.mipmap.ic_launcher);
childViewHolder.tv_child_name.setText(childList.get(i).get(i1).getChildName());
return view;
}
/**
* 这个方法需要返回true，不然不能实现子节点的点击事件
* Whether the child at the specified position is selectable.
*
* @param i
* @param i1
* @return
*/
@Override
public boolean isChildSelectable(int i, int i1) {
return true;
}
private static class GroupViewHolder {
TextView tv_group_name;
}
private static class ChildViewHolder {
ImageView iv_child_icon;
TextView tv_child_name;
}
}
两个普通javaBean代码：
package com.example.expandablelistviewdemo;
/**
* Created by Devin on 2016/7/12.
*/
public class Group {
private String groupName;
public Group() {
}
public Group(String groupName) {
this.groupName = groupName;
}
public String getGroupName() {
return groupName;
}
public void setGroupName(String groupName) {
this.groupName = groupName;
}
}
package com.example.expandablelistviewdemo;
/**
* Created by Devin on 2016/7/12.
*/
public class Child {
private String childName;
public Child() {
}
public Child(String childName) {
this.childName = childName;
}
public String getChildName() {
return childName;
}
public void setChildName(String childName) {
this.childName = childName;
}
}
最后是activity代码：
package com.example.expandablelistviewdemo;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private List<Group> groupList;
private List<List<Child>> childList;
private ExpandableListView ex_list;
private CustomAdapter customAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ex_list = (ExpandableListView) findViewById(R.id.ex_list);
initData();
customAdapter = new CustomAdapter(this, groupList, childList);
ex_list.setAdapter(customAdapter);
//子节点的点击事件
ex_list.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView expandableListView, View view, int i, int i1, long l) {
Toast.makeText(MainActivity.this, "你点击的是：" + childList.get(i).get(i1).getChildName(), Toast.LENGTH_SHORT).show();
return true;
}
});
}
private void initData() {
groupList = new ArrayList<>();
childList = new ArrayList<>();
groupList.add(new Group("载货汽车"));
groupList.add(new Group("越野汽车"));
groupList.add(new Group("自卸汽车"));
groupList.add(new Group("专用汽车"));
groupList.add(new Group("客车"));
groupList.add(new Group("牵引车"));
groupList.add(new Group("轿车"));
groupList.add(new Group("半挂车"));
List<Child> child1 = new ArrayList<>();
child1.add(new Child("微型货车"));
child1.add(new Child("轻型货车"));
child1.add(new Child("中型货车"));
child1.add(new Child("重型货车"));
childList.add(child1);
List<Child> child2 = new ArrayList<>();
child2.add(new Child("轻型越野车"));
child2.add(new Child("中型越野车"));
child2.add(new Child("重型越野车"));
child2.add(new Child("超重型越野车"));
childList.add(child2);
List<Child> child3 = new ArrayList<>();
child3.add(new Child("轻型自卸车"));
child3.add(new Child("中型自卸车"));
child3.add(new Child("重型自卸车"));
child3.add(new Child("矿用自卸车"));
childList.add(child3);
List<Child> child4 = new ArrayList<>();
child4.add(new Child("箱式汽车"));
child4.add(new Child("罐式汽车"));
child4.add(new Child("起重举升车"));
child4.add(new Child("仓栅式车"));
child4.add(new Child("特种结构车"));
child4.add(new Child("专用自卸车"));
childList.add(child4);
List<Child> child5 = new ArrayList<>();
child5.add(new Child("微型客车"));
child5.add(new Child("轻型客车"));
child5.add(new Child("中型客车"));
child5.add(new Child("大型客车"));
child5.add(new Child("特大型客车"));
childList.add(child5);
List<Child> child6 = new ArrayList<>();
child6.add(new Child("半挂牵引车"));
child6.add(new Child("全挂牵引车"));
childList.add(child6);
List<Child> child7 = new ArrayList<>();
child7.add(new Child("微型轿车"));
child7.add(new Child("普通级轿车"));
child7.add(new Child("中级轿车"));
child7.add(new Child("中高级轿车"));
child7.add(new Child("高级轿车"));
childList.add(child7);
List<Child> child8 = new ArrayList<>();
child8.add(new Child("轻型半挂车"));
child8.add(new Child("中型半挂车"));
child8.add(new Child("重型半挂车"));
child8.add(new Child("超重半挂车"));
childList.add(child8);
}
}
最终实现效果图：
ExpandableListView控件就简单介绍到这里，这里只是基本的实现，有需求的可以扩展。
照例附上国内镜像API
下面我们学习另外一个控件StackView栈视图
stackView是一个将一组View逐个展示给用户的控件，它是一组view的集合，这些view一个压着一个，view之间可以进行随意切换。下面我们通过实例了解StackView的使用方法
布局文件代码：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<StackView
android:id="@+id/sk"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:loopViews="true" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<Button
android:id="@+id/btn_previous"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="前一张" />
<Button
android:id="@+id/btn_next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="后一张" />
</LinearLayout>
</LinearLayout>
Activity代码：
package com.example.expandablelistviewdemo;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.StackView;
/**
* Created by Devin on 2016/7/12.
*/
public class StackViewActivity extends AppCompatActivity {
private StackView sk;
private Button btn_previous;
private Button btn_next;
private int[] mColors = {Color.BLUE, Color.CYAN, Color.GRAY, Color.GREEN, Color.RED};
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_stackview);
sk = (StackView) findViewById(R.id.sk);
btn_next = (Button) findViewById(R.id.btn_next);
btn_previous = (Button) findViewById(R.id.btn_previous);
ColorAdapter adapter = new ColorAdapter(getApplicationContext(), mColors);
sk.setAdapter(adapter);
btn_previous.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
sk.showPrevious();
}
});
btn_next.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
sk.showNext();
}
});
}
/**
* 自定义适配器
*/
private class ColorAdapter extends BaseAdapter {
private Context mContext;
private int[] mColors;
public ColorAdapter(Context context, int[] colors) {
mContext = context;
mColors = colors;
}
public int getCount() {
return mColors == null ? 0 : mColors.length;
}
public Object getItem(int position) {
return mColors == null ? null : mColors[position];
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View view, ViewGroup parent) {
LinearLayout.LayoutParams colorLayoutParams = new LinearLayout.LayoutParams(400, 400);
LinearLayout colorLayout = new LinearLayout(mContext);
colorLayout.setBackgroundColor(mColors[position]);
colorLayout.setLayoutParams(colorLayoutParams);
return colorLayout;
}
}
}
最后实现效果图
可以通过手势拖拽切换，也可以点击按钮切换。StackView就简单介绍到这里，有需求的同学可以扩展，可以实现比较好的效果。StackView是androidAPI3.0以后的。
附上国内镜像API
下一节我们介绍一下Dialog控件
Android学习笔记二十七之ExpandableListView可折叠列表和StackView栈视图
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原文地址：http://blog.csdn.net/solo_talk/article/details/51889586
