Android仿美團淘寶實現多級下拉列表菜單功能

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，我們給出這個下拉菜單需要的組建。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來實現諸如美團裡面的“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？，這裡我們利用了PopupWindow來實現這一彈出式窗口。然後我們在彈出式窗口裡面再定義我們的下來列表項，是單列還是二級菜單，都是由裡面來定。

3）不同的菜單，需要一級或者需要二級，在這裡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。

4）視圖裡面嵌入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。是彈出裡面嵌套的類，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。

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("距離"); 
    mTextArray.add("區域"); 
    mTextArray.add("距離"); 
    expandTabView.setValue(mTextArray, mViewArray);//將三個下拉列表設置進去 
    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() { 
      @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。

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，動態生成頭部按鈕個數 
 * 
 * @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); 
  } 
  /** 
   * 根據選擇的位置設置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 ""; 
  } 
  /** 
   * 設置tabitem的個數和初始值 
   * @param textArray 標題數組 
   * @param viewArray 控件數組 
   */ 
  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); 
  } 
  /** 
   * 如果菜單成展開狀態，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); 
  } 
  @Override 
  public void onDismiss() { 
    Log.d(TAG,"onDismiss,selectPosition:"+selectPosition); 
    showPopup(selectPosition); 
    popupWindow.setOnDismissListener(null); 
  } 
  private OnButtonClickListener mOnButtonClickListener; 
  /** 
   * 設置tabitem的點擊監聽事件 
   */ 
  public void setOnButtonClickListener(OnButtonClickListener l) { 
    mOnButtonClickListener = l; 
  } 
  /** 
   * 自定義tabitem點擊回調接口 
   */ 
  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.效果圖

以上所述是小編給大家介紹的Android仿美團淘寶實現多級下拉列表菜單功能，多條目的實例代碼，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對本站網站的支持！