概述

我们在使用手机QQ时，点击菜单键，会弹出如本案例说演示的效果图似的菜单选项。

实现方式有很多种，在这里我们来演示下如何通过自定义PopupWindow的方式一步一步的实现如上效果。

关于PopupWindow的基本知识点请查看 PopupWindow

分析

UI部分

shape的使用-corners solid等
中间的使用View分割
背景的处理
……

功能点

响应点击事件–通过接口回调的方式
点击外部，PopupWindow可消失
……

实现

自定义PopupWindow

UI编写

位于父布局的底部
距边框有一定的距离，根布局使用layout_margin即可
ListView(四个圆角+白色背景) + View分割（透明色) +底部文字（圆角+白色背景）
蓝色字体居中显示(ListView中的在Item设置即可，底部文字设置gravity即可)
…….

布局文件如下所示：

list_popupwindow.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/id_rl_relativeLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="16dp"
    android:padding="16dp">


    <ListView
        android:id="@+id/id_lv_popupWindowListView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/view"
        android:background="@drawable/bg_menu" />

    <View
        android:id="@+id/view"
        android:layout_width="match_parent"
        android:layout_height="20dp"
        android:layout_above="@+id/id_tv_bottom"
        android:background="@color/transparent" />

    <TextView
        android:id="@+id/id_tv_bottom"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:background="@drawable/bg_menu"
        android:gravity="center"
        android:text="取消"
        android:textColor="@color/skyblue"
        android:textSize="20dp" />

</RelativeLayout>

其中用到的几个背景xml如下，都在drawable目录下

bg_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <!--stroke: 设置描边，可描成实线或虚线。当然了也可以不设置stroke属性-->
    <stroke android:color="@color/transparent"
        android:width="2dp"/>
    <!--设置形状填充的颜色，只有android:color一个属性-->
    <solid android:color="@color/bg_white" />
    <!-- 设置圆角，只适用于rectangle类型，可分别设置四个角不同半径的圆角，当设置的圆角半径很大时，比如200dp，就可变成弧形边了-->
    <corners android:radius="10dp" />

</shape>

自定义PopupWindow编写 +接口回调+监听OnTouch事件实现点击外部消失

加载自定义的xml文件，然后获取ListView组件，设置adapter 即可显示UI布局。代码中的注释已经非常详细了，再此就不多涉及了。


import android.content.Context;
import android.graphics.drawable.ColorDrawable;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;

import com.turing.base.R;
import com.turing.nutritiousSerial.listPopupWindow.adapter.CustomPopupWindowAdpater;
import com.turing.nutritiousSerial.listPopupWindow.beans.PopupItemBean;

import java.util.List;

/**
 * MyApp
 *
 * @author Mr.Yang on 2016-04-25  10:12.
 * @version 1.0
 * @desc
 */
public class ListPopupWindow extends PopupWindow {

    //上下文
    private Context context;
    //父视图
    private View parentView;
    //item数据源
    private List<PopupItemBean> dataList;

    //适配器
    private CustomPopupWindowAdpater adapter;

    //声明接口对象
    private OnPopubItemClickListener popupItemListener;
    private OnBottomTextViewClickListener bottomTextViewListener;


    /**
     * 定义接口用于PopupItem回调点击事件处理
     */
    public interface OnPopubItemClickListener {
        void onPopupItemClick(View view, int postion);
    }

    /**
     * 定义接口用于底部TextView回调点击事件处理
     */
    public interface OnBottomTextViewClickListener {
        void onBottomClick();
    }

    /**
     * 构造函数
     */
    public ListPopupWindow(Context context,
                           List<PopupItemBean> dataList,
                           View parentView,
                           OnPopubItemClickListener popupItemListener,
                           OnBottomTextViewClickListener bottomTextViewListener) {

        this.context = context;
        this.dataList = dataList;
        this.parentView = parentView;

        this.popupItemListener = popupItemListener;
        this.bottomTextViewListener = bottomTextViewListener;

        initCustomPopupWindow();
    }


    /**
     * 初始化自定义的PopupWindow
     */
    private void initCustomPopupWindow() {
        // 加载自定义布局文件，转化为组件
        parentView = LayoutInflater.from(context).inflate(R.layout.list_popupwindow, null);
        // 设置显示的view
        setContentView(parentView);

        // 初始化控件
        ListView lv = (ListView) parentView.findViewById(R.id.id_lv_popupWindowListView);
        TextView tv = (TextView) parentView.findViewById(R.id.id_tv_bottom);

        // 设置弹出窗体的高
        this.setWidth(ViewGroup.LayoutParams.MATCH_PARENT);
        this.setHeight(ViewGroup.LayoutParams.MATCH_PARENT);
        // 设置弹出窗体可点击
        this.setFocusable(true);
        // 设置SelectPicPopupWindow弹出窗体的背景
        this.setBackgroundDrawable(new ColorDrawable(0xb0000000));


        // view添加OnTouchListener监听判断获取触屏位置如果在布局外面则销毁弹出框
        parentView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // getTop View自身的顶边到其父布局顶边的距离,因为是根目录所以为0
                int height = parentView.findViewById(R.id.id_rl_relativeLayout).getTop();
                // getY 点击事件距离控件顶边的举例
                int y = (int) event.getY();
                // 当抬起 并且 y>height时（也就是 只要不点击ListView范围内）,dismiss popupWindow
                if (event.getAction() == MotionEvent.ACTION_UP) {
                    if (y > height) {
                        dismiss();
                    }
                }
                return true;
            }
        });
        // 更新位置和大小(不加这行代码也行)
        update();
        // 实例化适配器
        adapter = new CustomPopupWindowAdpater(context, dataList);
        // 设置适配器
        lv.setAdapter(adapter);


        // ListView设置点击事件
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                // 回调onPopupItemClick
                popupItemListener.onPopupItemClick(view, position);
            }
        });

        // TextView设置点击事件
        tv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 回调onBottomClick
                bottomTextViewListener.onBottomClick();
            }
        });

    }
}

CustomPopupWindowAdpater.java


import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.turing.base.R;
import com.turing.nutritiousSerial.listPopupWindow.beans.PopupItemBean;

import java.util.List;

/**
 * MyApp
 *
 * @author Mr.Yang on 2016-04-25  11:04.
 * @version 1.0
 * @desc
 */
public class CustomPopupWindowAdpater extends BaseAdapter {

    private Context context;
    private List<PopupItemBean> datas;
    private LayoutInflater layoutInflater;

    /**
     * 构造函数
     */
    public CustomPopupWindowAdpater(Context context, List<PopupItemBean> datas) {
        this.context = context;
        this.datas = datas ;
        layoutInflater = LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return datas.size();
    }

    @Override
    public Object getItem(int position) {
        return datas.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // 声明ViewHolder
        ViewHolder viewHolder;

        if (convertView == null) {
            // 加载Item布局，转换为View布局
            convertView = layoutInflater.inflate(R.layout.popup_item, parent, false);
            // 实例化ViewHolder
            viewHolder = new ViewHolder();
            // 查找组件赋值给ViewHolder
            viewHolder.textView = (TextView) convertView.findViewById(R.id.id_tv_popupItemText);
            // 设置TAG
            convertView.setTag(viewHolder);

        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }


        // 设置Item中的值
        viewHolder.textView.setText(datas.get(position).getText()  );


        return convertView;
    }


    /**
     * 对应Item布局中的组件
     */
    class ViewHolder {

        private TextView textView;


    }
}

调用

因为PopupWindow需要依赖父组件来显示，所以实例话PopupWindow的时候，传入根布局View，实现接口回调Activity类实现自定义的两个接口，并传入到PopupWindow中。


import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.View;
import android.widget.RelativeLayout;

import com.turing.base.R;
import com.turing.base.utils.AlertUtil;
import com.turing.nutritiousSerial.listPopupWindow.beans.PopupItemBean;
import com.turing.nutritiousSerial.listPopupWindow.customPopupWindow.ListPopupWindow;

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

public class ListPopupWindowDemoActivity extends AppCompatActivity implements ListPopupWindow.OnPopubItemClickListener, ListPopupWindow.OnBottomTextViewClickListener {

    // 定义父View即PopupWindow依赖浮动的View
    private RelativeLayout relativeLayout;


    private ListPopupWindow popWindow;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_list_popup_window_demo);
        // 父View
        relativeLayout = (RelativeLayout) findViewById(R.id.id_rl_relativeLayout);
    }

    /**
     * 按钮监听事件
     *
     * @param view
     */
    public void showCustomListPopupWindow(View view) {

        // 展示数据集合
        List<PopupItemBean> datalists = new ArrayList<>();
        // List集合中的数据
        PopupItemBean itemBean1 = new PopupItemBean("版本更新");
        PopupItemBean itemBean2 = new PopupItemBean("反馈");
        PopupItemBean itemBean3 = new PopupItemBean("退出QQ");

        // 添加到List集合中
        datalists.add(itemBean1);
        datalists.add(itemBean2);
        datalists.add(itemBean3);

        // 实例化自定义ListPopupWindow
        popWindow = new ListPopupWindow(ListPopupWindowDemoActivity.this,
                datalists, relativeLayout, this, this);
        // 居中并且靠底部显示
        popWindow.showAtLocation(relativeLayout, Gravity.CENTER | Gravity.BOTTOM, 0, 0);
    }


    @Override
    public void onBottomClick() {
        popWindow.dismiss();
        AlertUtil.showToastShort(ListPopupWindowDemoActivity.this, "点击取消");

    }

    @Override
    public void onPopupItemClick(View view, int postion) {
        switch (postion) {
            case 0:
                AlertUtil.showToastShort(ListPopupWindowDemoActivity.this, String.valueOf(postion) + " 被点击");
                break;
            case 1:
                AlertUtil.showToastShort(ListPopupWindowDemoActivity.this, String.valueOf(postion) + " 被点击");
                break;
            case 2:
                AlertUtil.showToastShort(ListPopupWindowDemoActivity.this, String.valueOf(postion) + " 被点击");
                break;
            default:
                break;
        }
    }
}