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Android仿美团淘宝实现多级下拉列表菜单功能

时间：2021-01-20 14:14:49 | 栏目：Android代码 | 点击：次

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 

这里写图片描述

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