android 多级下拉菜单实现教程
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很多App,都有二级菜单出现,但android 本身实现的菜单又比较难看;前些天我自己思想了一个,供大家学习,为方便学习,这里我只用最简单的字符串菜单,如果大家想用更复杂或好看的,可以自定义listview 的子项即可。
一.首先看一下实现思路:
1. 使用上方按钮来弹出一级菜单,如果在弹出状态,再点击隐藏;
2. 点击一级菜单子项,弹出二级菜单,二级菜单里面也是一个listview 控件;
3. 点击二级菜单点击菜单的内容;
二 .实现
就是这么简单,下面来看一下具体实现:
1.在AndroidManifest.xml 设置主题为NoTitleBar
android:theme="@style/Theme.AppCompat.NoActionBar">2.在布局文件中添加自定义titlebar,并添加 listview 控件在title 下方,见布局文件;
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.shrg.jackli.morelevelmenu.MainActivity"> <LinearLayout android:id="@+id/titlebar" android:layout_width="match_parent" android:layout_height="40dp" android:orientation="horizontal" android:background="@android:color/black" android:gravity="center_vertical"> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="showListMenu" android:src="@mipmap/ic_menu" /> </LinearLayout> <ListView android:id="@+id/listView" android:background="@android:color/holo_blue_dark" android:layout_below="@id/titlebar" android:layout_width="100dp" android:layout_height="wrap_content" ></ListView> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="New Text" android:textSize="25sp" android:id="@+id/textView" android:layout_centerVertical="true" android:layout_centerHorizontal="true" /> </RelativeLayout>3.程序中将listview 控件关联起来 ,将listview 填充数据,监听listview 每一项
mListView =(ListView)findViewById(R.id.listView); mListView.setVisibility(View.GONE); mListView.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,province)); mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { pop_listView.setAdapter(new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1,pandc[position])); firstMenuIndex = position; popupWindow.showAsDropDown(mListView,view.getMeasuredWidth(),-mListView.getMeasuredHeight()); } });4.初始化popuwindow,监听popuwindow中listview 中子项,监听到点击二级菜单后隐藏一级和二级菜单
private void initPopupWindow() { pop_listView = (ListView)LayoutInflater.from(this).inflate(R.layout.popupwindow,null); pop_listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { showText.setText(pandc[firstMenuIndex][position]); popupWindow.dismiss(); mListView.setVisibility(View.GONE); } }); popupWindow = new PopupWindow(pop_listView, 150, ViewGroup.LayoutParams.WRAP_CONTENT); popupWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT)); popupWindow.setFocusable(true); }
效果图: