我們在常用的電商或者旅游APP中，例如美團(tuán)，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(tuán)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(xiàn)諸如美團(tuán)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。
4）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 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(qū)域"); mTextArray.add("距離"); expandTabView.setValue(mTextArray, mViewArray);//將三個下拉列表設(shè)置進(jìn)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(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 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(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 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(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); } @Override public 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(tuán)淘寶實現(xiàn)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(fù)大家的。在此也非常感謝大家對武林網(wǎng)網(wǎng)站的支持！
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