MainActivity.java

package com.yyy.djk.dropdownmenu;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.ListView;
import android.widget.TextView;

import com.yyydjk.library.DropDownMenu;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import butterknife.ButterKnife;
import butterknife.InjectView;

public class MainActivity 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.activity_main);
        ButterKnife.inject(this);
        initView();
    }

    private void initView() {
        //init city menu
        final ListView cityView = new ListView(this);
        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) {
                mDropDownMenu.setTabText(constellationPosition == 0 ? headers[3] : constellations[constellationPosition]);
                mDropDownMenu.closeMenu();
            }
        });

        //init popupViews
        popupViews.add(cityView);
        popupViews.add(ageView);
        popupViews.add(sexView);
        popupViews.add(constellationView);

        //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 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();
        }
    }
}