Android开发之多级下拉列表菜单实现（仿美团，淘宝等）

我们在常用的电商或者旅游APP中，例如美团，手机淘宝等等，都能够看的到有那种下拉式的二级列表菜单。具体如图所示：

(应大家需要提供下载地址：http://download.csdn.net/detail/minimicall/7956483)有人说受教了，可有人反应下载不下来！下来不知道怎么打开！我惊了，我自己再去下载，然后导入完全没有问题。我的环境是ubuntu14.04下的Eclipse ADT环境，谷歌标准环境。





上面两张图就是美团的一个二级列表菜单的一个展示。我相信很多人都想开发一个跟它一样的功能放到自己的APP中。好，接下来我们就开始动手，解决它。

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。

好分析就到上面为止，接下来我们一步步的说明实现。

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。

3，MainActivity

承载所有元素。看代码比看文字实在。

package com.example.expandtabview;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
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 static final String TAG = "MainActivity";
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() {
Log.d(TAG,"initView");
expandTabView = (ExpandTabView) findViewById(R.id.expandtab_view);
viewLeft = new ViewLeft(this);
viewMiddle = new ViewMiddle(this);
viewRight = new ViewRight(this);

}

private void initVaule() {
Log.d(TAG,"initValue");
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);//将三个下拉列表设置进去
expandTabView.setTitle(viewLeft.getShowText(), 0);
expandTabView.setTitle(viewMiddle.getShowText(), 1);
expandTabView.setTitle(viewRight.getShowText(), 2);

}

private void initListener() {
Log.d(TAG,"initListener");
viewLeft.setOnSelectListener(new ViewLeft.OnSelectListener() {

@Override
public void getValue(String distance, String showText) {
Log.d("ViewLeft", "OnSelectListener, getValue");
onRefresh(viewLeft, showText);
}
});

viewMiddle.setOnSelectListener(new ViewMiddle.OnSelectListener() {

@Override
public void getValue(String showText) {
Log.d("ViewMiddle","OnSelectListener, getValue");
onRefresh(viewMiddle,showText);

}
});

viewRight.setOnSelectListener(new ViewRight.OnSelectListener() {

@Override
public void getValue(String distance, String showText) {
Log.d("ViewRight","OnSelectListener, getValue");
onRefresh(viewRight, showText);
}
});

}

private void onRefresh(View view, String showText) {
Log.d(TAG,"onRefresh,view:"+view+",showText:"+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) {
Log.d(TAG,"getPosition");
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();
}

}

}

4 ，ExpandTabView

最主要就是如何处理当我们点击这些ToggleButton的时候要弹出或者收起这些PopupWindow。

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.util.Log;
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 zengjinlong
*/

public class ExpandTabView extends LinearLayout implements OnDismissListener {
private static final String TAG = "ExpandTabView";
private ToggleButton selectedButton;
private ArrayList<String> mTextArray = new ArrayList<String>();
private ArrayList<RelativeLayout> mViewArray = new ArrayList<RelativeLayout>();
private ArrayList<ToggleButton> mToggleButton = new ArrayList<ToggleButton>();
private Context mContext;
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
* @param textArray 标题数组
* @param viewArray 控件数组
*/
public void setValue(ArrayList<String> textArray, ArrayList<View> viewArray) {
if (mContext == null) {
return;
}
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Log.d(TAG,"setValue");
mTextArray = textArray;
for (int i = 0; i < viewArray.size(); i++) {
final RelativeLayout r = new RelativeLayout(mContext);
int maxHeight = (int) (displayHeight * 0.7);
RelativeLayout.LayoutParams rl = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, maxHeight);
rl.leftMargin = 10;
rl.rightMargin = 10;
r.addView(viewArray.get(i), rl);
mViewArray.add(r);
r.setTag(SMALL);
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) {
Log.d("RelativeLayout","view:"+v);
onPressBack();
}
});

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

if (selectedButton != null && selectedButton != tButton) {
selectedButton.setChecked(false);
}
selectedButton = tButton;
selectPosition = (Integer) selectedButton.getTag();
startAnimation();
if (mOnButtonClickListener != null && tButton.isChecked()) {
mOnButtonClickListener.onClick(selectPosition);
}
}
});
}// for..
}

private void startAnimation() {
Log.d(TAG,"startAnimation");
if (popupWindow == null) {
Log.d(TAG,"startAnimation(),new popupWindow now");
popupWindow = new PopupWindow(mViewArray.get(selectPosition), displayWidth, displayHeight);
popupWindow.setAnimationStyle(R.style.PopupWindowAnimation);
popupWindow.setFocusable(false);
popupWindow.setOutsideTouchable(true);
}
Log.d(TAG,"startAnimation(),selectedButton:"+selectedButton+",isChecked:"+selectedButton.isChecked()+
",popupWindow.isShowing:"+popupWindow.isShowing());
if (selectedButton.isChecked()) {

if (!popupWindow.isShowing()) {
showPopup(selectPosition);
} else {
popupWindow.setOnDismissListener(this);
popupWindow.dismiss();
hideView();
}
} 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() {
Log.d(TAG,"onPressBack");
if (popupWindow != null && popupWindow.isShowing()) {
popupWindow.dismiss();
hideView();
if (selectedButton != null) {
selectedButton.setChecked(false);
}
return true;
} else {
return false;
}

}

private void hideView() {
Log.d(TAG, "hide()");
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() {
Log.d(TAG,"onDismiss,selectPosition:"+selectPosition);
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);
}

}

5，ViewLeft

其中的一个示例，其他两个就不列举了

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 static final String TAG = "ViewLeft";
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);
adapter = new TextAdapter(context, items, R.drawable.choose_item_right, R.drawable.choose_eara_item_selector);
adapter.setTextSize(17);
if (mDistance != null) {
for (int i = 0; i < itemsVaule.length; i++) {
if (itemsVaule[i].equals(mDistance)) {
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() {

}

}

6，效果图

好，今天就到这里。。希望有用。