浅谈PopupWindow弹出菜单

实现将一个View显示在某一位置,而且是浮于当前窗口

首先要有一个要显示的view的布局，可以是任意View，包括ViewGroup

 <?xml version="1.0" encoding="utf-8"?>

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

     android:layout_width="fill_parent"

     android:layout_height="fill_parent"

     android:background="#d3d3d3"

     android:gravity="center_horizontal"

     android:orientation="vertical" >

     <TextView

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:gravity="center"

         android:id="@+id/textView"

         android:text="文本内容"

         />

 </LinearLayout>

然后主界面布局文件

 <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=".MainActivity" >

     <LinearLayout

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:orientation="horizontal"

         >

         <!-- 区域 -->

         <Button

             android:layout_width="0dp"

             android:layout_weight=""

             android:gravity="center"

             android:background="#0000"

             android:layout_height="wrap_content"

             android:text="区域"

             android:drawableRight="@drawable/title_bar_arrow_nor"

             android:id="@+id/btn_1"

             />

         <!-- 类别 -->

         <Button

             android:background="#0000"

             android:layout_width="0dp"

             android:layout_weight=""

             android:layout_height="wrap_content"

             android:text="类别"

             android:drawableRight="@drawable/title_bar_arrow_nor"

             android:id="@+id/btn_2"

             />

         <!-- 价格 -->

         <Button

             android:background="#0000"

             android:layout_width="0dp"

             android:layout_weight=""

             android:layout_height="wrap_content"

             android:text="价格"

             android:drawableRight="@drawable/title_bar_arrow_nor"

             android:id="@+id/btn_3"

             />

         <!-- 更多 -->

         <Button

             android:background="#0000"

             android:layout_width="0dp"

             android:layout_weight=""

             android:layout_height="wrap_content"

             android:text="更多"

             android:drawableRight="@drawable/title_bar_arrow_nor"

             android:id="@+id/btn_4"

             />

     </LinearLayout>

 </RelativeLayout>

主activity

 package com.example.aaa;

 import android.app.Activity;

 import android.os.Bundle;

 import android.view.View;

 import android.view.View.OnClickListener;

 import android.view.ViewGroup;

 import android.widget.Button;

 import android.widget.PopupWindow;

 import android.widget.TextView;

 public class MainActivity extends Activity implements OnClickListener {

     private PopupWindow pop;

     private Button btn1;

     private Button btn2;

     private Button btn3;

     private Button btn4;

     private TextView text;

     View view;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         initView();

         initPopWindow();

     }

     private void initView() {

         // TODO Auto-generated method stub

         btn1 = (Button) findViewById(R.id.btn_1);

         btn2 = (Button) findViewById(R.id.btn_2);

         btn3 = (Button) findViewById(R.id.btn_3);

         btn4 = (Button) findViewById(R.id.btn_4);

         btn1.setOnClickListener(this);

         btn2.setOnClickListener(this);

         btn3.setOnClickListener(this);

         btn4.setOnClickListener(this);

     }

     private void initPopWindow() {

         // TODO Auto-generated method stub

         //根据layout创建弹出界面

         view = this.getLayoutInflater().inflate(R.layout.popup_window, null);

         pop = new PopupWindow(view, ViewGroup.LayoutParams.FILL_PARENT,

                 ViewGroup.LayoutParams.WRAP_CONTENT);

         text = (TextView) view.findViewById(R.id.textView);

         pop.setOutsideTouchable(true);

         view.setOnClickListener(new View.OnClickListener() {

             @Override

             public void onClick(View v) {

                 // TODO Auto-generated method stub

                 pop.dismiss();

             }

         });

     }

     @Override

     public void onClick(View v) {

         // TODO Auto-generated method stub

         switch (v.getId()) {

         case R.id.btn_1:

             text.setText("区域");

             if(pop.isShowing())

                 pop.dismiss();

             else

                 pop.showAsDropDown(v);

             break;

         case R.id.btn_2:

             text.setText("类别");

             if(pop.isShowing())

                 pop.dismiss();

             else

             pop.showAsDropDown(v);

             break;

         case R.id.btn_3:

             text.setText("价格");

             if(pop.isShowing())

                 pop.dismiss();

             else

             pop.showAsDropDown(v);

             break;

         case R.id.btn_4:

             text.setText("更多");

             if(pop.isShowing())

                 pop.dismiss();

             else

             pop.showAsDropDown(v);

             break;

         default:

             break;

         }

     }

 }

出现位置的几个方法

showAsDropDown(View anchor)：相对某个控件的位置（正左下方），无偏移

showAsDropDown(View anchor, int xoff, int yoff)：相对某个控件的位置，有偏移

showAtLocation(View parent, int gravity, int x, int y)：相对于父控件的位置（例如正中央Gravity.CENTER，下方Gravity.BOTTOM等），可以设置偏移或无偏移

效果图：