注:本文转载于:http://blog.csdn.net/minimicall/article/details/39484493
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
plaincopy
- 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。
plaincopy
- 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);
- }
- /**
- * 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
plaincopy
- 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。