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;

	@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<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() {

			@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<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() {
				@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);
	}

	/**
	 * 假如菜单成展开状态，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

好，今天就到这里。。希望有用。