Android仿手机淘宝多级下拉菜单

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，我们给出这个下来菜单需要的组建。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。

3）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。

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<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() {@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<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<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);}@Overridepublic 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，效果图

好，今天就到这里。。希望有用。

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