联动二级菜单实现

参照美团app下拉式的二级列表菜单，公司项目中也有这种菜单的需求

                  

1，结构分析

首先，我们给出这个下来菜单需要的组建。我们用线框图来分析。

1）如上图所示，最外围的是一个Activity，顶部包含了一个View的容器，这个容器主要是装载ToggleButton来实现诸如美团里面的“美食，全城，理我最近，刷选”这一行。这一行一点就会弹出对应的下来菜单。

2）下拉菜单是如何实现的呢？，这里我们利用了PopupWindow来实现这一弹出式窗口。然后我们在弹出式窗口里面再定义我们的下来列表项，是单列还是二级菜单，都是由里面来定。

3）不同的菜单，需要一级或者需要二级，在这里根据我的需求而变动。我们在PopupWindow上面加一个自定义的LeftView，或者是MiddleView，RightView。

主要是一个ToggleButton，你弹出一个窗口，你就定制一个窗口。

3）视图里面嵌入ListView，就形成了列表项。

2，项目结构

本项目的项目结构如图所示：

1） Adapter。适配器，主要是为ListView提供数据适配的。

2）MainActivity。主活动页面。

3）ExpandTabView。本项目的核心类，它包含ToggleButton容器和PopupWindow，是控制弹出窗口的核心类。

4）ViewLeft,ViewMiddle,ViewRight。是弹出里面嵌套的类，实现不同的列表菜单。

先分析布局文件

选择器，用于点击不同区域之后改变颜色。

几个重要布局

主要布局文件

activity_main.xml

<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">
<com.example.view.ExpandTabView
     android:id="@+id/expandtab_view"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:text="@string/hello_world" />
</RelativeLayout>

顶部按钮布局  ，背景设置为选择器

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="@dimen/expand_tab_item_height"
    android:textColor="@color/black"
    android:gravity="center_vertical"
    android:paddingLeft="10dp"
    android:textSize="17sp"
    android:background="@drawable/choose_eara_item_selector" >

</TextView>

顶部ToggleButton，有弹出菜单和默认两种状态

<?xml version="1.0" encoding="utf-8"?>
<ToggleButton xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:gravity="center"
    android:text="ToggleButton"
    android:textOff="@null"
    android:textOn="@null"
    android:background="@drawable/expand_tab_selector"
    android:singleLine="true"
    android:textColor="@color/black">

</ToggleButton>

expand_tab_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:Android="http://schemas.android.com/apk/res/android">

    <item Android:drawable="@drawable/choosebar_press_down" Android:state_pressed="true"/>
    <item Android:drawable="@drawable/choosebar_press_up" Android:state_checked="true"/>
 <!-- focused -->
    <item Android:drawable="@drawable/choosebar_down"/>
 <!-- default -->

</selector>

view_distance.xml,单列菜单布局

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="5dp"
    android:layout_marginRight="5dp"
    android:background="@drawable/choosearea_bg_left" >

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:cacheColorHint="@color/no_color"
        android:divider="#dcdcdc"
        android:dividerHeight="1px"
        android:paddingLeft="4dp"
        android:paddingRight="4dp" >
    </ListView>

</merge>

注意这里的android:cacheColorHint属性

ListView是常用的显示控件，默认背景是和系统窗口一样的透明色，如果给ListView加上背景图片，或者背景颜色时，滚动时listView会黑掉，
原因是，滚动时，列表里面的view重绘时，用的依旧是系统默认的透明色，颜色值为#FF191919，
要改变这种情况，只需要调用listView的setCacheColorHint(0)，颜色值设置为0
或者xml文件中listView的属性 Android:cacheColorHint="#00000000"即可，
滚动时，重绘View的时候就不会有背景颜色。

<merge />标签用于减少View树的层次来优化Android的布局。

Merge了解更多，可参考:

Android 性能优化 四 布局优化merge标签的使用

Re-using Layouts with <include/>

Android Layout Tricks #2: Reusing layouts

 include与merge标签结合使用例子

Android Layout Tricks #3: Optimize by merging

《Android应用性能优化》 第8章 图形

性能优化之布局优化

Merge源码

Android抽象布局——include、merge 、ViewStub

更多优化相关的文章详见：《 Android 基础学习文章汇总》 第三部分 性能优化

view_regoin.xml 双列菜单布局文件

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="@dimen/expand_tab_eara_height"
    android:layout_marginLeft="5dp"
    android:layout_marginRight="5dp"
    android:background="@drawable/choosearea_bg_mid"
    android:orientation="horizontal" >

        <ListView
            android:id="@+id/listView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:cacheColorHint="@color/no_color"
            android:paddingLeft="4dp"
            android:layout_weight="1"
            android:scrollbars="none"
            android:dividerHeight="1px"
            android:divider="#dcdcdc"
            android:background="@color/white" >
        </ListView>
        
        <ListView
            android:id="@+id/listView2"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:cacheColorHint="@color/no_color"
            android:paddingRight="4dp"
            android:layout_weight="1"
            android:divider="@null"
            android:background="@color/choose_eara_item_press_color" >
        </ListView>

</merge>

接下来看看ExpandTabView.java

package com.example.view;

import java.util.ArrayList;

import com.example.expandtabview.R;

import android.app.Activity;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.PopupWindow.OnDismissListener;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.ToggleButton;

/**
 * 菜单控件头部，封装了下拉动画，动态生成头部按钮个数
 * 
 * @author yueyueniao
 */

public class ExpandTabView extends LinearLayout implements OnDismissListener {

    private ToggleButton selectedButton;
    private ArrayList<String> mTextArray = new ArrayList<String>();//用于保存字符串的数组
    private ArrayList<RelativeLayout> mViewArray = new ArrayList<RelativeLayout>();//用于保存RelativeLayout的数组
    private ArrayList<ToggleButton> mToggleButton = new ArrayList<ToggleButton>();//保存顶部可变按钮
    private Context mContext;//上下文环境
    private final int SMALL = 0;
    private int displayWidth;
    private int displayHeight;
    private PopupWindow popupWindow;
    private int selectPosition;

    public ExpandTabView(Context context) {
        super(context);
        init(context);
    }

    public ExpandTabView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    /**
     * 根据选择的位置设置tabitem显示的值
     */
    public void setTitle(String valueText, int position) {
        if (position < mToggleButton.size()) {
            mToggleButton.get(position).setText(valueText);
        }
    }

    public void setTitle(String title){
        
    }
    /**
     * 根据选择的位置获取tabitem显示的值
     */
    public String getTitle(int position) {
        if (position < mToggleButton.size() && mToggleButton.get(position).getText() != null) {
            return mToggleButton.get(position).getText().toString();
        }
        return "";
    }

    /**
     * 设置tabitem的个数和初始值
     */
    public void setValue(ArrayList<String> textArray, ArrayList<View> viewArray) {
        if (mContext == null) {
            return;
        }
        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        mTextArray = textArray;
        for (int i = 0; i < viewArray.size(); i++) {
            final RelativeLayout r = new RelativeLayout(mContext);
            int maxHeight = (int) (displayHeight * 0.7);
            //参数指定了子 View 的宽度和高度
            RelativeLayout.LayoutParams rl = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, maxHeight);
            rl.leftMargin = 10;
            rl.rightMargin = 10;
            //Adds a child view with the specified layout parameters
            r.addView(viewArray.get(i), rl);
            mViewArray.add(r);
            r.setTag(SMALL);
            //添加ToggleButton
            ToggleButton tButton = (ToggleButton) inflater.inflate(R.layout.toggle_button, this, false);
            addView(tButton);
            View line = new TextView(mContext);
            line.setBackgroundResource(R.drawable.choosebar_line);
            if (i < viewArray.size() - 1) {
                LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(2, LinearLayout.LayoutParams.MATCH_PARENT);
                addView(line, lp);
            }
            mToggleButton.add(tButton);
            tButton.setTag(i);
            tButton.setText(mTextArray.get(i));

            r.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    onPressBack();
                }
            });

            r.setBackgroundColor(mContext.getResources().getColor(R.color.popup_main_background));
            tButton.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View view) {
                    // initPopupWindow();
                    ToggleButton tButton = (ToggleButton) view;

                    if (selectedButton != null && selectedButton != tButton) {
                        selectedButton.setChecked(false);
                    }
                    selectedButton = tButton;
                    selectPosition = (Integer) selectedButton.getTag();
                    //开始弹出菜单
                    startAnimation();
                    if (mOnButtonClickListener != null && tButton.isChecked()) {
                        mOnButtonClickListener.onClick(selectPosition);
                    }
                }
            });
        }
    }

    private void startAnimation() {
        //初次点击，生成popWindow
        if (popupWindow == null) {
            popupWindow = new PopupWindow(mViewArray.get(selectPosition), displayWidth, displayHeight);
            popupWindow.setAnimationStyle(R.style.PopupWindowAnimation);
            popupWindow.setFocusable(false);
            popupWindow.setOutsideTouchable(true);
        }
        //如果已经check
        if (selectedButton.isChecked()) {
            if (!popupWindow.isShowing()) {
                //如果popupWindow没有打开，则打开popupwindow
                showPopup(selectPosition);
            } else {
                //如果popupWindow打开,关闭menu
                popupWindow.setOnDismissListener(this);
                popupWindow.dismiss();
                hideView();
            }
        }
        //如果没有checked
        else {
            if (popupWindow.isShowing()) {
                popupWindow.dismiss();
                hideView();
            }
        }
    }

    private void showPopup(int position) {
        View tView = mViewArray.get(selectPosition).getChildAt(0);
        if (tView instanceof ViewBaseAction) {
            ViewBaseAction f = (ViewBaseAction) tView;
            f.show();
        }
        if (popupWindow.getContentView() != mViewArray.get(position)) {
            popupWindow.setContentView(mViewArray.get(position));
        }
        popupWindow.showAsDropDown(this, 0, 0);
    }

    /**
     * 如果菜单成展开状态，则让菜单收回去
     */
    public boolean onPressBack() {
        if (popupWindow != null && popupWindow.isShowing()) {
            popupWindow.dismiss();
            hideView();
            if (selectedButton != null) {
                selectedButton.setChecked(false);
            }
            return true;
        } else {
            return false;
        }

    }

    private void hideView() {
        View tView = mViewArray.get(selectPosition).getChildAt(0);
        if (tView instanceof ViewBaseAction) {
            ViewBaseAction f = (ViewBaseAction) tView;
            f.hide();
        }
    }

    private void init(Context context) {
        mContext = context;
        displayWidth = ((Activity) mContext).getWindowManager().getDefaultDisplay().getWidth();
        displayHeight = ((Activity) mContext).getWindowManager().getDefaultDisplay().getHeight();
        setOrientation(LinearLayout.HORIZONTAL);
    }

    @Override
    public void onDismiss() {
        showPopup(selectPosition);
        popupWindow.setOnDismissListener(null);
    }

    private OnButtonClickListener mOnButtonClickListener;

    /**
     * 设置tabitem的点击监听事件
     */
    public void setOnButtonClickListener(OnButtonClickListener l) {
        mOnButtonClickListener = l;
    }

    /**
     * 自定义tabitem点击回调接口
     */
    public interface OnButtonClickListener {
        public void onClick(int selectPosition);
    }

}

ViewBaseAction 接口

package com.example.view;

public interface ViewBaseAction {
    
    /**
     * 菜单隐藏操作
     */
    public void hide();
    
    /**
     * 菜单显示操作
     */
    public void show();
}

代码动态实现单列左侧菜单 ViewLeft.java

package com.example.view;

import com.example.adapter.TextAdapter;
import com.example.expandtabview.R;

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.Toast;


public class ViewLeft extends RelativeLayout implements ViewBaseAction{

    private ListView mListView;
    private final String[] items = new String[] { "item1", "item2", "item3", "item4", "item5", "item6" };//显示字段
    private final String[] itemsVaule = new String[] { "1", "2", "3", "4", "5", "6" };//隐藏id
    private OnSelectListener mOnSelectListener;
    private TextAdapter adapter;
    private String mDistance;
    private String showText = "item1";
    private Context mContext;

    public String getShowText() {
        return showText;
    }

    public ViewLeft(Context context) {
        super(context);
        init(context);
    }

    public ViewLeft(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context);
    }

    public ViewLeft(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    private void init(Context context) {
        mContext = context;
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        inflater.inflate(R.layout.view_distance, this, true);
        setBackgroundDrawable(getResources().getDrawable(R.drawable.choosearea_bg_mid));
        mListView = (ListView) findViewById(R.id.listView);
        //设置适配器
        adapter = new TextAdapter(context, items, R.drawable.choose_item_right, R.drawable.choose_eara_item_selector);
        //设置列表字体大小
        adapter.setTextSize(17);
        if (mDistance != null) {
            for (int i = 0; i < itemsVaule.length; i++) {
                if (itemsVaule[i].equals(mDistance)) {
                    // 设置选中的position,但不通知刷新
                    adapter.setSelectedPositionNoNotify(i);
                    showText = items[i];
                    break;
                }
            }
        }
        mListView.setAdapter(adapter);
        adapter.setOnItemClickListener(new TextAdapter.OnItemClickListener() {

            @Override
            public void onItemClick(View view, int position) {

                if (mOnSelectListener != null) {
                    showText = items[position];
                    mOnSelectListener.getValue(itemsVaule[position], items[position]);
                }
            }
        });
    }

    public void setOnSelectListener(OnSelectListener onSelectListener) {
        mOnSelectListener = onSelectListener;
    }

    public interface OnSelectListener {
        public void getValue(String distance, String showText);
    }

    @Override
    public void hide() {
        
    }

    @Override
    public void show() {
        
    }

}

实现双列中间菜单，ViewMiddle.java

package com.example.view;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

import android.content.Context;
import android.graphics.Region;
import android.util.AttributeSet;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.ListView;

import com.example.adapter.TextAdapter;
import com.example.expandtabview.R;

public class ViewMiddle extends LinearLayout implements ViewBaseAction {
    
    private ListView regionListView;
    private ListView plateListView;
    private ArrayList<String> groups = new ArrayList<String>();
    private LinkedList<String> childrenItem = new LinkedList<String>();
    private SparseArray<LinkedList<String>> children = new SparseArray<LinkedList<String>>();
    private TextAdapter plateListViewAdapter;
    private TextAdapter earaListViewAdapter;
    private OnSelectListener mOnSelectListener;
    private int tEaraPosition = 0;
    private int tBlockPosition = 0;
    private String showString = "不限";

    public ViewMiddle(Context context) {
        super(context);
        init(context);
    }

    public ViewMiddle(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public void updateShowText(String showArea, String showBlock) {
        if (showArea == null || showBlock == null) {
            return;
        }
        for (int i = 0; i < groups.size(); i++) {
            if (groups.get(i).equals(showArea)) {
                earaListViewAdapter.setSelectedPosition(i);
                childrenItem.clear();//Removes all elements from this LinkedList, leaving it empty.
                if (i < children.size()) {
                    childrenItem.addAll(children.get(i));
                }
                tEaraPosition = i;
                break;
            }
        }
        for (int j = 0; j < childrenItem.size(); j++) {
            if (childrenItem.get(j).replace("不限", "").equals(showBlock.trim())) {
                plateListViewAdapter.setSelectedPosition(j);
                tBlockPosition = j;
                break;
            }
        }
        setDefaultSelect();
    }

    private void init(Context context) {
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        inflater.inflate(R.layout.view_region, this, true);
        regionListView = (ListView) findViewById(R.id.listView);
        plateListView = (ListView) findViewById(R.id.listView2);
        setBackgroundDrawable(getResources().getDrawable(
                R.drawable.choosearea_bg_left));
        //左边父菜单有10个选项，右边子菜单有15个选项
        for(int i=0;i<10;i++){
            groups.add(i+"行");
            LinkedList<String> tItem = new LinkedList<String>();
            for(int j=0;j<15;j++){
                
                tItem.add(i+"行"+j+"列");
                
            }
            children.put(i, tItem);
        }

        earaListViewAdapter = new TextAdapter(context, groups,
                R.drawable.choose_item_selected,
                R.drawable.choose_eara_item_selector);
        earaListViewAdapter.setTextSize(17);
        earaListViewAdapter.setSelectedPositionNoNotify(tEaraPosition);
        regionListView.setAdapter(earaListViewAdapter);
        earaListViewAdapter
                .setOnItemClickListener(new TextAdapter.OnItemClickListener() {

                    @Override
                    public void onItemClick(View view, int position) {
                        if (position < children.size()) {
                            childrenItem.clear();
                            childrenItem.addAll(children.get(position));
                            plateListViewAdapter.notifyDataSetChanged();
                        }
                    }
                });
        if (tEaraPosition < children.size())
            childrenItem.addAll(children.get(tEaraPosition));
        plateListViewAdapter = new TextAdapter(context, childrenItem,
                R.drawable.choose_item_right,
                R.drawable.choose_plate_item_selector);
        plateListViewAdapter.setTextSize(15);
        plateListViewAdapter.setSelectedPositionNoNotify(tBlockPosition);
        plateListView.setAdapter(plateListViewAdapter);
        //点击事件
        plateListViewAdapter
                .setOnItemClickListener(new TextAdapter.OnItemClickListener() {

                    @Override
                    public void onItemClick(View view, final int position) {
                        
                        showString = childrenItem.get(position);
                        if (mOnSelectListener != null) {
                            
                            mOnSelectListener.getValue(showString);
                        }

                    }
                });
        if (tBlockPosition < childrenItem.size())
            showString = childrenItem.get(tBlockPosition);
        if (showString.contains("不限")) {
            showString = showString.replace("不限", "");
        }
        setDefaultSelect();

    }

    public void setDefaultSelect() {
        regionListView.setSelection(tEaraPosition);
        plateListView.setSelection(tBlockPosition);
    }

    public String getShowText() {
        return showString;
    }

    public void setOnSelectListener(OnSelectListener onSelectListener) {
        mOnSelectListener = onSelectListener;
    }

    public interface OnSelectListener {
        public void getValue(String showText);
    }

    @Override
    public void hide() {
        // TODO Auto-generated method stub

    }

    @Override
    public void show() {
        // TODO Auto-generated method stub

    }
}

右布局代码跟左布局类似

适配器

package com.example.adapter;

import java.util.List;

import com.example.expandtabview.R;


import android.content.Context;
import android.graphics.drawable.Drawable;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class TextAdapter extends ArrayAdapter<String> {

    private Context mContext;
    private List<String> mListData;
    private String[] mArrayData;
    private int selectedPos = -1;
    private String selectedText = "";
    private int normalDrawbleId;
    private Drawable selectedDrawble;
    private float textSize;
    private OnClickListener onClickListener;
    private OnItemClickListener mOnItemClickListener;
    //sId,nId为图片id,mListData为列表内容
    public TextAdapter(Context context, List<String> listData, int sId, int nId) {
        super(context, R.string.no_data, listData);
        mContext = context;
        mListData = listData;
        selectedDrawble = mContext.getResources().getDrawable(sId);
        normalDrawbleId = nId;

        init();
    }

    private void init() {
        onClickListener = new OnClickListener() {

            @Override
            public void onClick(View view) {
                //得到Tag,根据Tag得到位置
                selectedPos = (Integer) view.getTag();
                setSelectedPosition(selectedPos);
                if (mOnItemClickListener != null) {
                    mOnItemClickListener.onItemClick(view, selectedPos);
                }
            }
        };
    }

    public TextAdapter(Context context, String[] arrayData, int sId, int nId) {
        super(context, R.string.no_data, arrayData);
        mContext = context;
        mArrayData = arrayData;
        selectedDrawble = mContext.getResources().getDrawable(sId);
        normalDrawbleId = nId;
        init();
    }

    /**
     * 设置选中的position,并通知列表刷新
     */
    public void setSelectedPosition(int pos) {
        if (mListData != null && pos < mListData.size()) {
            selectedPos = pos;
            selectedText = mListData.get(pos);
            notifyDataSetChanged();
        } else if (mArrayData != null && pos < mArrayData.length) {
            selectedPos = pos;
            selectedText = mArrayData[pos];
            notifyDataSetChanged();
        }

    }

    /**
     * 设置选中的position,但不通知刷新
     */
    public void setSelectedPositionNoNotify(int pos) {
        selectedPos = pos;
        if (mListData != null && pos < mListData.size()) {
            selectedText = mListData.get(pos);
        } else if (mArrayData != null && pos < mArrayData.length) {
            selectedText = mArrayData[pos];
        }
    }

    /**
     * 获取选中的position
     */
    public int getSelectedPosition() {
        if (mArrayData != null && selectedPos < mArrayData.length) {
            return selectedPos;
        }
        if (mListData != null && selectedPos < mListData.size()) {
            return selectedPos;
        }

        return -1;
    }

    /**
     * 设置列表字体大小
     */
    public void setTextSize(float tSize) {
        textSize = tSize;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        TextView view;
        if (convertView == null) {
            view = (TextView) LayoutInflater.from(mContext).inflate(R.layout.choose_item, parent, false);
        } else {
            view = (TextView) convertView;
        }
        //
        view.setTag(position);
        String mString = "";
        if (mListData != null) {
            if (position < mListData.size()) {
                mString = mListData.get(position);
            }
        } else if (mArrayData != null) {
            if (position < mArrayData.length) {
                mString = mArrayData[position];
            }
        }
        if (mString.contains("不限"))
            view.setText("不限");
        else
            view.setText(mString);
        view.setTextSize(TypedValue.COMPLEX_UNIT_SP,textSize);

        if (selectedText != null && selectedText.equals(mString)) {
            view.setBackgroundDrawable(selectedDrawble);//设置选中的背景图片
        } else {
            view.setBackgroundDrawable(mContext.getResources().getDrawable(normalDrawbleId));//设置未选中状态背景图片
        }
        view.setPadding(20, 0, 0, 0);
        view.setOnClickListener(onClickListener);
        return view;
    }

    public void setOnItemClickListener(OnItemClickListener l) {
        mOnItemClickListener = l;
    }

    /**
     * 重新定义菜单选项单击接口
     */
    public interface OnItemClickListener {
        public void onItemClick(View view, int position);
    }

}

MainActivity.java

package com.example.expandtabview;


import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import com.example.view.ExpandTabView;
import com.example.view.ViewLeft;
import com.example.view.ViewMiddle;
import com.example.view.ViewRight;

public class MainActivity extends Activity {

    private ExpandTabView expandTabView;
    private ArrayList<View> mViewArray = new ArrayList<View>();
    private ViewLeft viewLeft;
    private ViewMiddle viewMiddle;
    private ViewRight viewRight;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        initVaule();
        initListener();
        
    }

    private void initView() {
        
        expandTabView = (ExpandTabView) findViewById(R.id.expandtab_view);
        viewLeft = new ViewLeft(this);
        viewMiddle = new ViewMiddle(this);
        viewRight = new ViewRight(this);
        
    }

    private void initVaule() {
        
         mViewArray.add(viewLeft);
        mViewArray.add(viewMiddle);
         mViewArray.add(viewRight);
        ArrayList<String> mTextArray = new ArrayList<String>();
         mTextArray.add("距离");
        mTextArray.add("区域");
         mTextArray.add("距离");
        expandTabView.setValue(mTextArray, mViewArray);
         expandTabView.setTitle(viewLeft.getShowText(), 0);
        expandTabView.setTitle(viewMiddle.getShowText(), 1);
        expandTabView.setTitle(viewRight.getShowText(), 2);
        
    }

    private void initListener() {
        
        viewLeft.setOnSelectListener(new ViewLeft.OnSelectListener() {

            @Override
            public void getValue(String distance, String showText) {
                onRefresh(viewLeft, showText);
            }
        });
        
        viewMiddle.setOnSelectListener(new ViewMiddle.OnSelectListener() {
            
            @Override
            public void getValue(String showText) {
                
                onRefresh(viewMiddle,showText);
                
            }
        });
        
        viewRight.setOnSelectListener(new ViewRight.OnSelectListener() {

            @Override
            public void getValue(String distance, String showText) {
                onRefresh(viewRight, showText);
            }
        });
        
    }
    
    private void onRefresh(View view, String showText) {
        
        expandTabView.onPressBack();
        int position = getPositon(view);
        if (position >= 0 && !expandTabView.getTitle(position).equals(showText)) {
            expandTabView.setTitle(showText, position);
        }
        Toast.makeText(MainActivity.this, showText, Toast.LENGTH_SHORT).show();

    }
    
    private int getPositon(View tView) {
        for (int i = 0; i < mViewArray.size(); i++) {
            if (mViewArray.get(i) == tView) {
                return i;
            }
        }
        return -1;
    }
    
    @Override
    public void onBackPressed() {
        
        if (!expandTabView.onPressBack()) {
            finish();
        }
        
    }

}
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原文地址：https://www.cnblogs.com/six-moon/p/4649872.html