PopupWindow学习

显示效果

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Java代码

MainActivity

package com.example.administrator.textexample;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.WindowManager;import android.widget.GridView;import android.widget.PopupWindow;import java.util.List;import java.util.Map;public class MySelectpoupwindow extends PopupWindow {    private MySelectAdapter heroAdapter;    public MySelectpoupwindow(Context context, List<Map<String, String>> list,                              final HeroSelectListener eventListener) {        // 下拉框的宽高        this.setWidth(WindowManager.LayoutParams.MATCH_PARENT);        this.setHeight(WindowManager.LayoutParams.WRAP_CONTENT);        // 外边界面是否可以点击        this.setOutsideTouchable(true);        View view = LayoutInflater.from(context).inflate(R.layout.my_select_layout, null);        setContentView(view);        heroAdapter = new MySelectAdapter(context, list);        heroAdapter.setListener(new MySelectAdapter.ItemListener() {            @Override            public void itemListener(int position) {                // 回调                eventListener.click(position);                heroAdapter.setClickitem(position);            }        });        GridView selectGrid = (GridView) view.findViewById(R.id.hero_select_grid);        selectGrid.setAdapter(heroAdapter);        if(list != null && list.size() > 0){            heroAdapter.setClickitem(0);        }        // 外边界面点击后关闭下拉框        View overlayView = view.findViewById(R.id.hero_select_overlay);        overlayView.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                dismiss();            }        });    }    public interface HeroSelectListener {        void click(int i);    }}

MySelectpoupwindow

package com.example.administrator.textexample;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.WindowManager;import android.widget.GridView;import android.widget.PopupWindow;import java.util.List;import java.util.Map;public class MySelectpoupwindow extends PopupWindow {    private MySelectAdapter heroAdapter;    public MySelectpoupwindow(Context context, List<Map<String, String>> list,                              final HeroSelectListener eventListener) {        // 下拉框的宽高        this.setWidth(WindowManager.LayoutParams.MATCH_PARENT);        this.setHeight(WindowManager.LayoutParams.WRAP_CONTENT);        // 外边界面是否可以点击        this.setOutsideTouchable(true);        View view = LayoutInflater.from(context).inflate(R.layout.my_select_layout, null);        setContentView(view);        heroAdapter = new MySelectAdapter(context, list);        heroAdapter.setListener(new MySelectAdapter.ItemListener() {            @Override            public void itemListener(int position) {                // 回调                eventListener.click(position);                heroAdapter.setClickitem(position);            }        });        GridView selectGrid = (GridView) view.findViewById(R.id.hero_select_grid);        selectGrid.setAdapter(heroAdapter);        if(list != null && list.size() > 0){            heroAdapter.setClickitem(0);        }        // 外边界面点击后关闭下拉框        View overlayView = view.findViewById(R.id.hero_select_overlay);        overlayView.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                dismiss();            }        });    }    public interface HeroSelectListener {        void click(int i);    }}

MySelectAdapter

package com.example.administrator.textexample;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 java.util.List;import java.util.Map;public class MySelectAdapter extends BaseAdapter {    private Context context;    private List<Map<String, String>> mlist;    private int clickitem = -1;    public MySelectAdapter(Context context, List<Map<String, String>> list) {        this.context = context;        this.mlist = list;    }    @Override    public int getCount() {        return mlist.size();    }    public void setClickitem(int position) {        this.clickitem = position;    }    @Override    public Object getItem(int position) {        return mlist.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        viewHolder vh;        if (null == convertView) {            vh = new viewHolder();            convertView = LayoutInflater.from(context).inflate(R.layout.my_select_item, parent, false);            vh.tv = (TextView) convertView.findViewById(R.id.heroselect_tv);            convertView.setTag(vh);        } else {            vh = (viewHolder) convertView.getTag();        }        String name = mlist.get(position).get("name");        vh.tv.setText(name);        final int pos = position;        if (listener != null) {            vh.tv.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                    // 回调                    listener.itemListener(pos);                }            });        }        return convertView;    }    public class viewHolder {        TextView tv;    }    public interface ItemListener {        void itemListener(int position);    }    public ItemListener listener;    public void setListener(ItemListener listener) {        this.listener = listener;    }}

xml

activity_main

<?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.example.administrator.textexample.MainActivity">    <Button        android:id="@+id/button"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:text="下拉窗口" />    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:textSize="30dp"        android:layout_above="@+id/showText"        android:layout_marginBottom="20dp"        android:text="下拉框点击的内容"/>    <TextView        android:id="@+id/showText"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:textSize="30dp"        android:layout_centerInParent="true"/></RelativeLayout>

my_select_layout

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:orientation="vertical">    <GridView        android:id="@+id/hero_select_grid"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:horizontalSpacing="9dp"        android:numColumns="4"        android:paddingBottom="10dp"        android:paddingLeft="9dp"        android:paddingRight="9dp"        android:paddingTop="10dp"        android:verticalSpacing="9dp">    </GridView>    <View        android:id="@+id/hero_select_overlay"        android:layout_width="match_parent"        android:layout_height="match_parent"        /></LinearLayout>

my_select_item

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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"              android:orientation="vertical">    <TextView        android:id="@+id/heroselect_tv"        android:gravity = "center"        android:textSize = "15dp"        android:layout_width="76dp"        android:layout_height="31dp"        tools:text="射手"        /></LinearLayout>