DropDownMenu使用解析

Gradle Dependency

allPRojects {    repositories {        ...        maven { url "https://jitpack.io" }    }}dependencies {    compile 'com.github.dongjunkun:DropDownMenu:1.0.3'}
使用
添加DropDownMenu 到你的布局文件，如下
<com.yyydjk.library.DropDownMenu    android:id="@+id/dropDownMenu"    android:layout_width="match_parent"    android:layout_height="match_parent"    app:ddmenuTextSize="13sp" //tab字体大小    app:ddtextUnselectedColor="@color/drop_down_unselected" //tab未选中颜色    app:ddtextSelectedColor="@color/drop_down_selected" //tab选中颜色    app:dddividerColor="@color/gray"    //分割线颜色    app:ddunderlineColor="@color/gray"  //下划线颜色    app:ddmenuSelectedIcon="@mipmap/drop_down_selected_icon" //tab选中状态图标    app:ddmenuUnselectedIcon="@mipmap/drop_down_unselected_icon"//tab未选中状态图标    app:ddmaskColor="@color/mask_color"     //遮罩颜色，一般是半透明    app:ddmenuBackgroundColor="@color/white" //tab 背景颜色    ... />
我们只需要在java代码中调用下面的代码
 //tabs 所有标题，popupListViews  所有菜单，contentView 内容mDropDownMenu.setDropDownMenu(tabs, popupListViews, contentView);
mDropDownMenu.setTabText(position == 0 ? headers[2] : sexs[position]); //item被选择时调用mDropDownMenu.closeMenu(); //默认自带动画效果贴出源码，方便更好的理解参数：
setDropDownMenu(List<String> tabTexts,List<View> popupViews,View contentView)
ScreenShot
效果不错吧，嘿嘿，这是github上的效果，喔并没有做改动/(^o^)/~那么我们需要做什么呢？其实就是围绕mDropDownMenu.setDropDownMenu(tabs, popupListViews, contentView);参数展开的： 0.准备最上边tabs数据； 1.准备PopupView集合，及对应的adapter，包括填充条目item布局样式； 2.contentView的布局及数据变化加载需要自己设置； 3.可通过listView的setOnItemClickListener获得需要自己获取所选的条目position；adapter这里就不絮叨了，我们直接看Activity中代码：
public class DropDownMenuActivity extends AppCompatActivity {    @InjectView(R.id.dropDownMenu)    DropDownMenu mDropDownMenu;    private String headers[] = {"城市", "年龄", "性别", "星座"};    private List<View> popupViews = new ArrayList<>();    private GirdDropDownAdapter cityAdapter;    private ListDropDownAdapter ageAdapter;    private ListDropDownAdapter sexAdapter;    private ConstellationAdapter constellationAdapter;    private String citys[] = {"不限", "武汉", "北京", "上海", "成都", "广州", "深圳", "重庆", "天津", "西安", "南京", "杭州"};    private String ages[] = {"不限", "18岁以下", "18-22岁", "23-26岁", "27-35岁", "35岁以上"};    private String sexs[] = {"不限", "男", "女"};    private String constellations[] = {"不限", "白羊座", "金牛座", "双子座", "巨蟹座", "狮子座", "处女座", "天秤座", "天蝎座", "射手座", "摩羯座", "水瓶座", "双鱼座"};    private int constellationPosition = 0;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.dropdowmenu);        ButterKnife.inject(this);        initView();    }    private void initView() {        //init city menu        final ListView cityView = new ListView(this); //gird:准备        cityAdapter = new GirdDropDownAdapter(this, Arrays.asList(citys));        cityView.setDividerHeight(0);        cityView.setAdapter(cityAdapter);        //init age menu        final ListView ageView = new ListView(this);        ageView.setDividerHeight(0);        ageAdapter = new ListDropDownAdapter(this, Arrays.asList(ages));        ageView.setAdapter(ageAdapter);        //init sex menu        final ListView sexView = new ListView(this);        sexView.setDividerHeight(0);        sexAdapter = new ListDropDownAdapter(this, Arrays.asList(sexs));        sexView.setAdapter(sexAdapter);        //init constellation        final View constellationView = getLayoutInflater().inflate(R.layout.custom_layout, null);        GridView constellation = ButterKnife.findById(constellationView, R.id.constellation);        constellationAdapter = new ConstellationAdapter(this, Arrays.asList(constellations));        constellation.setAdapter(constellationAdapter);        TextView ok = ButterKnife.findById(constellationView, R.id.ok);        ok.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //其内部已经设置了记录当前tab位置的参数，该参数会随tab被点击而改变，所以这里直接设置tab值即可                //此处若想获得constellations第一个值“不限”，可修改constellationPosition初始值为-1，且这里代码改为constellationPosition == -1)                mDropDownMenu.setTabText((constellationPosition == 0) ? headers[3] : constellations[constellationPosition]);                mDropDownMenu.closeMenu();//                changeContentView();   //在这里可以请求获得经筛选后要显示的内容            }        });        //add item click event        cityView.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                cityAdapter.setCheckItem(position);                mDropDownMenu.setTabText(position == 0 ? headers[0] : citys[position]);                mDropDownMenu.closeMenu();            }        });        ageView.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                ageAdapter.setCheckItem(position);                mDropDownMenu.setTabText(position == 0 ? headers[1] : ages[position]);                mDropDownMenu.closeMenu();            }        });        sexView.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                sexAdapter.setCheckItem(position);                mDropDownMenu.setTabText(position == 0 ? headers[2] : sexs[position]);                mDropDownMenu.closeMenu();            }        });        constellation.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                constellationAdapter.setCheckItem(position);                constellationPosition = position;            }        });        //init popupViews        popupViews.add(cityView);        popupViews.add(ageView);        popupViews.add(sexView);        popupViews.add(constellationView);        //init context view        TextView contentView = new TextView(this);        contentView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));        contentView.setText("内容显示区域");        contentView.setGravity(Gravity.CENTER);        contentView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20);        //init dropdownview        mDropDownMenu.setDropDownMenu(Arrays.asList(headers), popupViews, contentView);    }    @Override    public void onBackPressed() {        //退出activity前关闭菜单        if (mDropDownMenu.isShowing()) {            mDropDownMenu.closeMenu();        } else {            super.onBackPressed();        }    }}主要地方已经做了注释，希望能帮到大家吧！下边是我自己画的DropDownMenu层级图,可以帮助理解布局:虽然有点丑，下次改进吧，嘿嘿。。。简书 3Q竹林