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Android开发之多级下拉列表菜单实现（仿美团，淘宝等）
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注：本文轉載于：http://blog.csdn.net/minimicall/article/details/39484493
下載地址：http://download.csdn.net/detail/minimicall/7956483
我們在常用的電商或者旅游APP中，例如美團，手機淘寶等等，都能夠看的到有那種下拉式的二級列表菜單。具體如圖所示：
上面兩張圖就是美團的一個二級列表菜單的一個展示。我相信很多人都想開發一個跟它一樣的功能放到自己的APP中。好，接下來我們就開始動手，解決它。
1，結構分析
首先，我們給出這個下來菜單需要的組建。我們用線框圖來分析。
1）如上圖所示，最外圍的是一個Activity，頂部包含了一個View的容器，這個容器主要是裝載ToggleButton來實現諸如美團里面的“美食，全城，理我最近，刷選”這一行。這一行一點就會彈出對應的下來菜單。
2）下拉菜單是如何實現的呢？，這里我們利用了PopupWindow來實現這一彈出式窗口。然后我們在彈出式窗口里面再定義我們的下來列表項，是單列還是二級菜單，都是由里面來定。
3）不同的菜單，需要一級或者需要二級，在這里根據我的需求而變動。我們在PopupWindow上面加一個自定義的LeftView，或者是MiddleView，RightView。主要是一個ToggleButton，你彈出一個窗口，你就定制一個窗口。
3）視圖里面嵌入ListView，就形成了列表項。
好分析就到上面為止，接下來我們一步步的說明實現。
2，項目結構
本項目的項目結構如圖所示：
1）?Adapter。適配器，主要是為ListView提供數據適配的。
2）MainActivity。主活動頁面。
3）ExpandTabView。本項目的核心類，它包含ToggleButton容器和PopupWindow，是控制彈出窗口的核心類。
4）ViewLeft,ViewMiddle,ViewRight。是彈出里面嵌套的類，實現不同的列表菜單。
3，MainActivity
承載所有元素。看代碼比看文字實在。
[java]?view plaincopy
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("距離");??????????mTextArray.add("區域");??????????mTextArray.add("距離");??????????expandTabView.setValue(mTextArray,?mViewArray);??????????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
最主要就是如何處理當我們點擊這些ToggleButton的時候要彈出或者收起這些PopupWindow。
[java]?view plaincopy
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;????????????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);??????}????????????????public?void?setTitle(String?valueText,?int?position)?{??????????if?(position?<?mToggleButton.size())?{??????????????mToggleButton.get(position).setText(valueText);??????????}??????}????????public?void?setTitle(String?title){????????????????}??????????????public?String?getTitle(int?position)?{??????????if?(position?<?mToggleButton.size()?&&?mToggleButton.get(position).getText()?!=?null)?{??????????????return?mToggleButton.get(position).getText().toString();??????????}??????????return?"";??????}??????????????????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)");????????????????????????????????????????????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);??????????????????????}??????????????????}??????????????});??????????}??????}????????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);??????}????????????????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;????????????????public?void?setOnButtonClickListener(OnButtonClickListener?l)?{??????????mOnButtonClickListener?=?l;??????}????????????????public?interface?OnButtonClickListener?{??????????public?void?onClick(int?selectPosition);??????}????}??
5，ViewLeft
其中的一個示例，其他兩個就不列舉了
[java]?view plaincopy
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"?};??????private?final?String[]?itemsVaule?=?new?String[]?{?"1",?"2",?"3",?"4",?"5",?"6"?};??????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，效果圖
好，今天就到這里。。希望有用。
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