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(fā)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(jié)構(gòu)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(xiàn)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(yīng)的下來菜單。

2）下拉菜單是如何實現(xiàn)的呢？，這里我們利用了PopupWindow來實現(xiàn)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(jù)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(xiàn)。

2，項目結(jié)構(gòu)

本項目的項目結(jié)構(gòu)如圖所示：

1） Adapter。適配器，主要是為ListView提供數(shù)據(jù)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(xiàn)不同的列表菜單。

3，MainActivity

承載所有元素。看代碼比看文字實在。

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;@Overrideprotected 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(qū)域");mTextArray.add("距離");expandTabView.setValue(mTextArray, mViewArray);//將三個下拉列表設(shè)置進去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() {@Overridepublic void getValue(String distance, String showText) {Log.d("ViewLeft", "OnSelectListener, getValue");onRefresh(viewLeft, showText);}});viewMiddle.setOnSelectListener(new ViewMiddle.OnSelectListener() {@Overridepublic void getValue(String showText) {Log.d("ViewMiddle","OnSelectListener, getValue");onRefresh(viewMiddle,showText);}});viewRight.setOnSelectListener(new ViewRight.OnSelectListener() {@Overridepublic 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;}@Overridepublic void onBackPressed() {if (!expandTabView.onPressBack()) {finish();}}}

4 ，ExpandTabView

最主要就是如何處理當(dāng)我們點擊這些ToggleButton的時候要彈出或者收起這些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;/*** 菜單控件頭部，封裝了下拉動畫，動態(tài)生成頭部按鈕個數(shù)* * @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);}/*** 根據(jù)選擇的位置設(shè)置tabitem顯示的值*/public void setTitle(String valueText, int position) {if (position < mToggleButton.size()) {mToggleButton.get(position).setText(valueText);}}public void setTitle(String title){}/*** 根據(jù)選擇的位置獲取tabitem顯示的值*/public String getTitle(int position) {if (position < mToggleButton.size() && mToggleButton.get(position).getText() != null) {return mToggleButton.get(position).getText().toString();}return "";}/*** 設(shè)置tabitem的個數(shù)和初始值* @param textArray 標(biāo)題數(shù)組* @param viewArray 控件數(shù)組*/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() {@Overridepublic void onClick(View v) {Log.d("RelativeLayout","view:"+v);onPressBack();}});r.setBackgroundColor(mContext.getResources().getColor(R.color.popup_main_background));tButton.setOnClickListener(new OnClickListener() {@Overridepublic 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);}/*** 如果菜單成展開狀態(tài)，則讓菜單收回去*/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);}@Overridepublic void onDismiss() {Log.d(TAG,"onDismiss,selectPosition:"+selectPosition);showPopup(selectPosition);popupWindow.setOnDismissListener(null);}private OnButtonClickListener mOnButtonClickListener;/*** 設(shè)置tabitem的點擊監(jiān)聽事件*/public void setOnButtonClickListener(OnButtonClickListener l) {mOnButtonClickListener = l;}/*** 自定義tabitem點擊回調(diào)接口*/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

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" };//顯示字段private final String[] itemsVaule = new String[] { "1", "2", "3", "4", "5", "6" };//隱藏idprivate 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() {@Overridepublic 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);}@Overridepublic void hide() {}@Overridepublic void show() {}}

6，效果圖

好，今天就到這里。。希望有用。

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