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，我们给出这个下拉菜单需要的组建。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。
4）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 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;
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);
}
public void setTitle(String valueText, int position) {
if (position < mToggleButton.size()) {
mToggleButton.get(position).setText(valueText);
}
}
public void setTitle(String title){
}
public String getTitle(int position) {
if (position < mToggleButton.size() && mToggleButton.get(position).getText() != null) {
return mToggleButton.get(position).getText().toString();
}
return "";
}
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);
}
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;
public void setonButtonClickListener(onButtonClickListener l) {
monButtonClickListener = l;
}
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
以上所述是小编给大家介绍的Android仿美团淘宝实现多级下拉列表菜单功能，多条目的实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对考高分网网站的支持！
