ListView实现二级菜单

实现如上图所示的二级菜单：

1上面是通过两个ListView实现的，父LIstView控制子ListView，其中配置文件如下

<cn.doublemenu.com.view.CategoryList

android:orientation="vertical" android:background="#88000000"

android:layout_width="fill_parent" android:layout_height="fill_parent"

xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/categorylist"

android:visibility="gone">

<ImageView android:layout_height="wrap_content"

android:layout_width="wrap_content" android:src="@drawable/trangle_indicate"

android:layout_marginBottom="-22.0dip" android:layout_marginLeft="40.0dip" />

<RelativeLayout android:layout_height="fill_parent"

android:layout_width="fill_parent" android:background="@drawable/addresslist_bg"

android:layout_marginRight="15.0dip" android:layout_marginLeft="15.0dip"

android:layout_marginTop="15.0dip" android:layout_marginBottom="40.0dip">

<LinearLayout android:layout_height="fill_parent"

android:layout_width="fill_parent" android:orientation="horizontal"

android:paddingTop="2.0dip" android:paddingLeft="1.0dip"

android:paddingRight="1.0dip" android:paddingBottom="1.0dip">

<ListView android:id="@+id/list_group" android:scrollbars="none"

android:background="#00000000" android:layout_width="0.0px"

android:layout_height="fill_parent" android:cacheColorHint="#00000000"

android:divider="#ffbbbab7" android:dividerHeight="1.0px"

android:layout_weight="1.0" />

<ListView android:id="@+id/list_child" android:background="#f4f4f4"

android:layout_width="0.0px" android:layout_height="fill_parent"

android:cacheColorHint="#00000000" android:divider="@null"

android:layout_weight="1.0" />

</LinearLayout>

</RelativeLayout>

</cn.doublemenu.com.view.CategoryList>

2自定义的cn.doublemenu.com.view.CategoryList如下：

package cn.doublemenu.com.view;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.content.Context;

import android.util.AttributeSet;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.LinearLayout;

import android.widget.ListView;

import android.widget.TextView;

import android.widget.AdapterView.OnItemClickListener;

import cn.doublemenu.com.activity.R;

import cn.doublemenu.com.bean.Category;

import cn.doublemenu.com.db.GenericDAO;

public class CategoryList extends LinearLayout {

private List<Category> topCategories;

private Map<Integer, List<Category>> categoriesMap;

private GenericDAO dao;

private Context context;

private Listener listener;

private ListView groupListView;

private ListView childListView;

private ChildAdapter adapter;

private int positionOut;

public interface Listener {

public void onSelected(Category category, Category parentCategory);

public void onScroll(Category category);

}

public CategoryList(Context c, AttributeSet attrs) {

super(c, attrs);

dao = GenericDAO.getInstance(c);

context = c;

}

public void init(final Listener listener, Category category) {

topCategories = dao.listCategories();

categoriesMap = new HashMap<Integer, List<Category>>();

this.listener = listener;

adapter = new ChildAdapter(new ArrayList<Category>());

groupListView = (ListView) findViewById(R.id.list_group);

childListView = (ListView) findViewById(R.id.list_child);

groupListView.setCacheColorHint(0);

groupListView.setAdapter(new GroupAdapter());

childListView.setAdapter(adapter);

List<Category> childCategoryList = getCategories(0);

adapter.setCategoryList(childCategoryList);

adapter.notifyDataSetChanged();

groupListView.setOnItemClickListener(new OnItemClickListener() {

@Override

public void onItemClick(AdapterView<?> parent, View view,

int position, long id) {

// TODO Auto-generated method stub

positionOut = position;

List<Category> childList = getCategories(position);

adapter.setCategoryList(childList);

adapter.notifyDataSetChanged();

GroupAdapter adapt = (GroupAdapter) parent.getAdapter();

adapt.setmCurSelectPosition(position);

adapt.notifyDataSetChanged();

}

});

childListView.setOnItemClickListener(new OnItemClickListener() {

@Override

public void onItemClick(AdapterView<?> parent, View view,

int position, long id) {

listener.onSelected(adapter.getCategoryList().get(position),

topCategories.get(positionOut));

}

});

}

private List<Category> getCategories(int groupPosition) {

List<Category> categories = categoriesMap.get(groupPosition);

if (categories == null) {

Category parent = topCategories.get(groupPosition);

categories = dao.listCategories(parent);

categoriesMap.put(groupPosition, categories);

}

return categories;

}

private class ViewHolder {

public ImageView imgView;

public TextView textView;

}

class GroupAdapter extends BaseAdapter {

private ViewHolder mSelectHolder;

private int mCurSelectPosition = 0;

public ViewHolder getmSelectHolder() {

return mSelectHolder;

}

public void setmSelectHolder(ViewHolder mSelectHolder) {

this.mSelectHolder = mSelectHolder;

}

public int getmCurSelectPosition() {

return mCurSelectPosition;

}

public void setmCurSelectPosition(int mCurSelectPosition) {

this.mCurSelectPosition = mCurSelectPosition;

}

@Override

public int getCount() {

// TODO Auto-generated method stub

if (topCategories != null) {

return topCategories.size();

} else {

return 0;

}

}

@Override

public Object getItem(int position) {

// TODO Auto-generated method stub

if (topCategories != null && topCategories.size() > position - 1) {

return topCategories.get(position);

} else {

return null;

}

}

@Override

public long getItemId(int position) {

// TODO Auto-generated method stub

return position;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

// TODO Auto-generated method stub

final ViewHolder viewHolder;

if (convertView == null) {

LayoutInflater layoutInflater = (LayoutInflater) getContext()

.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

convertView = layoutInflater.inflate(

R.layout.address_item_layout, null);

viewHolder = new ViewHolder();

viewHolder.textView = (TextView) convertView

.findViewById(R.id.city_item_title);

viewHolder.imgView = (ImageView) convertView

.findViewById(R.id.img_tag);

convertView.setTag(viewHolder);

} else {

viewHolder = (ViewHolder) convertView.getTag();

}

if (position == mCurSelectPosition) {

convertView.setBackgroundColor(getResources().getColor(

R.color.address_child));

upDateItemUi(viewHolder.imgView, true);

} else {

convertView.setBackgroundColor(getResources().getColor(

R.color.white));

upDateItemUi(viewHolder.imgView, false);

}

Category category = topCategories.get(position);

viewHolder.textView.setText(category.name);

return convertView;

}

}

private void upDateItemUi(ImageView imgView, boolean b) {

if (b) {

imgView.setVisibility(View.VISIBLE);

} else {

imgView.setVisibility(View.INVISIBLE);

}

}

class ChildAdapter extends BaseAdapter {

private List<Category> categoryList;

public List<Category> getCategoryList() {

return categoryList;

}

public void setCategoryList(List<Category> categoryList) {

this.categoryList = categoryList;

}

public ChildAdapter(List<Category> childList) {

super();

this.categoryList = childList;

}

@Override

public int getCount() {

// TODO Auto-generated method stub

if (categoryList != null) {

return categoryList.size();

} else {

return 0;

}

}

@Override

public Object getItem(int position) {

// TODO Auto-generated method stub

if (categoryList != null && categoryList.size() > position - 1) {

return categoryList.get(position);

} else {

return null;

}

}

@Override

public long getItemId(int position) {

// TODO Auto-generated method stub

return position;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

// TODO Auto-generated method stub

View view = convertView;

if (view == null) {

LayoutInflater layoutInflater = (LayoutInflater) context

.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

view = layoutInflater.inflate(R.layout.address_textview_layout,

null);

}

TextView cityChildTextView = (TextView) view

.findViewById(R.id.single_textview);

cityChildTextView.setText(categoryList.get(position).name);

return view;

}

}

}

3两个ListView包括两个Itemlayout,其中父ListView的Item是address_item_layout.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout android:layout_height="wrap_content"

android:layout_width="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android">

<LinearLayout android:layout_width="fill_parent"

android:layout_height="wrap_content" android:orientation="horizontal"

android:layout_alignParentTop="true">

<ImageView android:layout_height="fill_parent"

android:layout_width="5.0dip" android:background="#ff6600"

android:visibility="invisible" android:id="@+id/img_tag"></ImageView>

<TextView android:layout_height="fill_parent"

android:layout_width="fill_parent" android:textSize="16dp"

android:layout_marginLeft="6dp" android:layout_marginTop="9.0dip"

android:layout_marginBottom="9.0dip" android:id="@+id/city_item_title"

android:textColor="#505050" android:singleLine="true"

android:ellipsize="end" />

</LinearLayout>

</RelativeLayout>

子ListView的Item是address_textview_layout.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_height="fill_parent" android:layout_width="wrap_content"

android:paddingTop="9.0dip" android:paddingBottom="9.0dip">

<TextView android:id="@+id/single_textview"

android:layout_height="wrap_content" android:layout_width="wrap_content"

android:layout_alignParentLeft="true" android:paddingLeft="6dp"

android:textSize="16dip" android:singleLine="true" android:ellipsize="end"

android:background="@null" android:textColor="#707070" />

</RelativeLayout>

3在程序中初始化数据通过SQLite来实现

package cn.doublemenu.com.db;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.UnsupportedEncodingException;

import java.util.List;

import android.content.ContentValues;

import android.content.Context;

import android.database.SQLException;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteOpenHelper;

import android.util.Log;

import cn.doublemenu.com.activity.R;

import cn.doublemenu.com.bean.Category;

public class GenericDAO extends SQLiteOpenHelper {

private static Object lock = new Object();

private static SQLiteDatabase db;

public static final String KEY_ID = "id";

public static final int DATABASE_VERSION = 7;

private Context context;

private final static String DATABASE_NAME = "category";

private static volatile GenericDAO instance;

private GenericDAO(Context ctx) {

super(ctx, DATABASE_NAME, null, DATABASE_VERSION);

context = ctx;

}

/*

* public static GenericDAO getInstance() { return

* getInstance(ActivityManager.getCurrent()); }

*/

public static GenericDAO getInstance(Context ctx) {

try {

if (instance == null) {

synchronized (lock) {

if (instance == null) {

instance = new GenericDAO(ctx);

db = instance.getWritableDatabase();

}

}

}

} catch (Exception e) {

e.printStackTrace();

}

return instance;

}

private void onDown() {

// TODO Auto-generated method stub

}

@Override

public void onCreate(SQLiteDatabase db) {

try {

db.beginTransaction();

Log.e("test", "onCreate execute");

load(db, R.raw.category);

db.setTransactionSuccessful();

} catch (Exception ee) {

ee.printStackTrace();

Log.e("test", ee.toString());

} finally {

if (db != null) {

db.endTransaction();

}

}

}

private void load(SQLiteDatabase db, int fileId)

throws UnsupportedEncodingException, IOException {

BufferedReader bufferedReader = null;

try {

String temp;

InputStream in = context.getResources().openRawResource(fileId);

bufferedReader = new BufferedReader(new InputStreamReader(in,

"utf-8"));

while ((temp = bufferedReader.readLine()) != null) {

db.execSQL(temp);

temp = null;

}

} catch (Exception e) {

} finally {

if (bufferedReader != null) {

try {

bufferedReader.close();

} catch (Exception e) {

}

}

}

}

@Override

public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

try {

db.beginTransaction();

db.delete("category", null, null);

db.setTransactionSuccessful();

} catch (SQLException e) {

e.printStackTrace();

} finally {

db.endTransaction();

}

}

public long insert(String table, ContentValues values) {

long ret = db.insert(table, null, values);

return ret;

}

public Category getCategory(int id) {

return Category.get(db, id);

}

public List<Category> listCategories() {

try {

List<Category> ret = Category.list(db);

if (ret == null || ret.isEmpty()) {

onCreate(db);

return Category.list(db);

}

return ret;

} catch (Exception e) {

e.printStackTrace();

onCreate(db);

return Category.list(db);

}

}

public List<Category> listCategories(Category category) {

return Category.list(db, category);

}

}

CateGory定义如下、

package cn.doublemenu.com.bean;

import java.util.ArrayList;

import java.util.List;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

public class Category {

public int id;

public Integer pid;

public String name;

public static Category get(SQLiteDatabase db, int id) {

if (id == 255) {

Category category = new Category();

category.pid = 0;

category.id = 255;

category.name = "全部分类";

return category;

}

Cursor cursor = db.rawQuery("SELECT * FROM category WHERE id = " + id,

null);

cursor.moveToFirst();

Category ret = toCategory(cursor);

cursor.close();

return ret;

}

public static List<Category> list(SQLiteDatabase db) {

List<Category> ret = new ArrayList<Category>();

Cursor cursor = null;

try {

ret.add(get(db, 255));

cursor = db.rawQuery("SELECT * FROM category WHERE pid IS NULL",

null);

if (cursor.moveToFirst()) {

do {

ret.add(toCategory(cursor));

} while (cursor.moveToNext());

}

} catch (Exception e) {

} finally {

if (cursor != null) {

try {

cursor.close();

} catch (Exception ee) {

ee.printStackTrace();

}

}

}

return ret;

}

public static List<Category> list(SQLiteDatabase db, Category parent) {

List<Category> ret = new ArrayList<Category>();

ret.add(parent);

Cursor cursor = db.rawQuery(

"SELECT id,pid,name FROM category WHERE pid = " + parent.id,

null);

if (cursor.moveToFirst()) {

do {

ret.add(toCategory(cursor));

} while (cursor.moveToNext());

}

cursor.close();

return ret;

}

private static Category toCategory(Cursor cursor) {

Category category = new Category();

category.id = cursor.getInt(0);

category.pid = cursor.getInt(1);

category.name = cursor.getString(2);

return category;

}

@Override

public boolean equals(Object o) {

return o instanceof Category && ((Category) o).id == id;

}

}

在程序中使用二级菜单：

package cn.doublemenu.com.activity;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import cn.doublemenu.com.bean.Category;

import cn.doublemenu.com.db.GenericDAO;

import cn.doublemenu.com.view.CategoryList;

public class MainActivity extends Activity {

protected Category category;

private CategoryList categoryList;

private Button categoryButton;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

GenericDAO.getInstance(this).getWritableDatabase();

categoryButton = (Button) findViewById(R.id.show);

categoryButton.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

boolean visible = (categoryList.getVisibility() == View.VISIBLE);

hideList(visible);

}

});

initCategoryList(255);

}

protected void initCategoryList(int cat) {

category = GenericDAO.getInstance(this).getCategory(cat);

categoryList = (CategoryList) findViewById(R.id.categorylist);

categoryList.init(new CategoryList.Listener() {

public void onSelected(Category c, Category parentCategory) {

categoryList.setVisibility(View.GONE);

}

public void onScroll(Category category) {

}

}, category);

}

protected void hideList(boolean vis) {

if (categoryList != null) {

if (vis) {

categoryList.setVisibility(View.GONE);

} else {

categoryList.setVisibility(View.VISIBLE);

}

}

}

}

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