Android仿美团淘宝实现多级下拉列表菜单功能

2019-12-12 04:02:39

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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：

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，我们给出这个下拉菜单需要的组建。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。

4）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。

这里写图片描述

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 mViewArray = new ArrayList();   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 mTextArray = new ArrayList();     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 mTextArray = new ArrayList();   private ArrayList mViewArray = new ArrayList();   private ArrayList mToggleButton = new ArrayList();   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 textArray, ArrayList 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

这里写图片描述