介绍
含有Expandable功能的ListView
看图
主界面
<ExpandableListView
android:id="@+id/expandablelistview"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ExpandableListView>父界面
# content_expandable_list_view.xml
<?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">
<TextView
android:id="@+id/parent_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:text="这是父item"
android:textColor="#000"
android:textSize="20sp"
android:textStyle="bold" />
</LinearLayout>子界面
# content_expandable_list_view_child.xml
<?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">
<TextView
android:id="@+id/child_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:text="这是子item"
android:textColor="#000"
android:textSize="18sp" />
</LinearLayout>代码分解
设置Adapter
ExpandableListView expandablelistview = (ExpandableListView) findViewById(R.id.expandablelistview);
expandablelistview.setAdapter(new MyExpandableListViewAdapter());设置条目点击事件
expandablelistview.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
Toast.makeText(ExpandableListViewActivity.this, "onChildClick" + childPosition, Toast.LENGTH_SHORT).show();
return true;
}
});设置长按事件
expandablelistview.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
String content = "";
if ((int) view.getTag(R.layout.content_expandable_list_view) == -1) {
content = "父类第" + view.getTag(R.layout.content_expandable_list_view_child) + "项" + "被长按了";
} else {
content = "父类第" + view.getTag(R.layout.content_expandable_list_view) + "项" + "中的"
+ "子类第" + view.getTag(R.layout.content_expandable_list_view_child) + "项" + "被长按了";
}
Toast.makeText(ExpandableListViewActivity.this, content, Toast.LENGTH_SHORT).show();
return true;
}
});获得父布局
// 获得父项显示的view
@Override
public View getGroupView(int parentPos, boolean b, View view, ViewGroup viewGroup) {
if (view == null) {
LayoutInflater inflater = (LayoutInflater) ExpandableListViewActivity
.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.content_expandable_list_view, null);
}
view.setTag(R.layout.content_expandable_list_view, parentPos);
view.setTag(R.layout.content_expandable_list_view_child, -1);
TextView text = (TextView) view.findViewById(R.id.parent_title);
text.setText(parentList[parentPos]);
return view;
}获得子布局
// 获得子项显示的view
@Override
public View getChildView(int parentPos, int childPos, boolean b, View view, ViewGroup viewGroup) {
if (view == null) {
LayoutInflater inflater = (LayoutInflater) ExpandableListViewActivity
.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.content_expandable_list_view_child, null);
}
view.setTag(R.layout.content_expandable_list_view, parentPos);
view.setTag(R.layout.content_expandable_list_view_child, childPos);
TextView text = (TextView) view.findViewById(R.id.child_title);
text.setText(dataset.get(parentList[parentPos]).get(childPos));
text.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(ExpandableListViewActivity.this, "点到了内置的textview", Toast.LENGTH_SHORT).show();
}
});
return view;
}设置子布局可选中
// 子项是否可选中，如果需要设置子项的点击事件，需要返回true
@Override
public boolean isChildSelectable(int i, int i1) {
return true;
}所有代码
package com.sainthigh.newwebview;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class ExpandableListViewActivity extends AppCompatActivity {
public static void startExpandableListViewActivity(Context ctx) {
Intent intent = new Intent(ctx, ExpandableListViewActivity.class);
ctx.startActivity(intent);
}
private Map<String, List<String>> dataset = new HashMap<>();
private String[] parentList = new String[]{"first", "second", "third"};
private List<String> childrenList1 = new ArrayList<>();
private List<String> childrenList2 = new ArrayList<>();
private List<String> childrenList3 = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_expandable_list_view);
initialData();
ExpandableListView expandablelistview = (ExpandableListView) findViewById(R.id.expandablelistview);
expandablelistview.setAdapter(new MyExpandableListViewAdapter());
expandablelistview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(ExpandableListViewActivity.this, "onItemClickListener--" + position, Toast.LENGTH_SHORT).show();
}
});
expandablelistview.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
Toast.makeText(ExpandableListViewActivity.this, "onChildClick" + childPosition, Toast.LENGTH_SHORT).show();
return true;
}
});
expandablelistview.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
String content = "";
if ((int) view.getTag(R.layout.content_expandable_list_view) == -1) {
content = "父类第" + view.getTag(R.layout.content_expandable_list_view_child) + "项" + "被长按了";
} else {
content = "父类第" + view.getTag(R.layout.content_expandable_list_view) + "项" + "中的"
+ "子类第" + view.getTag(R.layout.content_expandable_list_view_child) + "项" + "被长按了";
}
Toast.makeText(ExpandableListViewActivity.this, content, Toast.LENGTH_SHORT).show();
return true;
}
});
}
private void initialData() {
childrenList1.add(parentList[0] + "-" + "first");
childrenList1.add(parentList[0] + "-" + "second");
childrenList1.add(parentList[0] + "-" + "third");
childrenList2.add(parentList[1] + "-" + "first");
childrenList2.add(parentList[1] + "-" + "second");
childrenList2.add(parentList[1] + "-" + "third");
childrenList3.add(parentList[2] + "-" + "first");
childrenList3.add(parentList[2] + "-" + "second");
childrenList3.add(parentList[2] + "-" + "third");
dataset.put(parentList[0], childrenList1);
dataset.put(parentList[1], childrenList2);
dataset.put(parentList[2], childrenList3);
}
private class MyExpandableListViewAdapter extends BaseExpandableListAdapter {
// 获得某个父项的某个子项
@Override
public Object getChild(int parentPos, int childPos) {
return dataset.get(parentList[parentPos]).get(childPos);
}
// 获得父项的数量
@Override
public int getGroupCount() {
return dataset.size();
}
// 获得某个父项的子项数目
@Override
public int getChildrenCount(int parentPos) {
return dataset.get(parentList[parentPos]).size();
}
// 获得某个父项
@Override
public Object getGroup(int parentPos) {
return dataset.get(parentList[parentPos]);
}
// 获得某个父项的id
@Override
public long getGroupId(int parentPos) {
return parentPos;
}
// 获得某个父项的某个子项的id
@Override
public long getChildId(int parentPos, int childPos) {
return childPos;
}
// 按函数的名字来理解应该是是否具有稳定的id，这个方法目前一直都是返回false，没有去改动过
@Override
public boolean hasStableIds() {
return false;
}
// 获得父项显示的view
@Override
public View getGroupView(int parentPos, boolean b, View view, ViewGroup viewGroup) {
if (view == null) {
LayoutInflater inflater = (LayoutInflater) ExpandableListViewActivity
.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.content_expandable_list_view, null);
}
view.setTag(R.layout.content_expandable_list_view, parentPos);
view.setTag(R.layout.content_expandable_list_view_child, -1);
TextView text = (TextView) view.findViewById(R.id.parent_title);
text.setText(parentList[parentPos]);
return view;
}
// 获得子项显示的view
@Override
public View getChildView(int parentPos, int childPos, boolean b, View view, ViewGroup viewGroup) {
if (view == null) {
LayoutInflater inflater = (LayoutInflater) ExpandableListViewActivity
.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.content_expandable_list_view_child, null);
}
view.setTag(R.layout.content_expandable_list_view, parentPos);
view.setTag(R.layout.content_expandable_list_view_child, childPos);
TextView text = (TextView) view.findViewById(R.id.child_title);
text.setText(dataset.get(parentList[parentPos]).get(childPos));
text.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(ExpandableListViewActivity.this, "点到了内置的textview", Toast.LENGTH_SHORT).show();
}
});
return view;
}
// 子项是否可选中，如果需要设置子项的点击事件，需要返回true
@Override
public boolean isChildSelectable(int i, int i1) {
return true;
}
}
}
