Android-PopupWindow弹出对话框

Android的对话框常用的有两种：PopupWindow和AlertDialog。PopupWindow顾名思义为弹出菜单，不同于AlertDialog对话框，PopupWindow弹出的位置可以很多变化，按照有无偏移分，可以分为无偏移和偏移两种；按照参照类型不同又可以分为两种：相对某个控件（Anchor锚）的位置和父容器内部的相对位置。具体如下：

函数	简介
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)	父容器容器相对位置，例如正中央Gravity.CENTER，下方Gravity.BOTTOM等

下面是运行程序截图：

















程序代码：

布局文件：main.xml

<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"
android:id="@+id/layout">

<TextView android:id="@+id/text_view"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="@string/hello"
android:textSize="22dp"/>

<Button android:id="@+id/button_test1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="以自己为Anchor，不偏移"/>

<Button android:id="@+id/button_test2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="以自己为Anchor，正下方"/>

<Button android:id="@+id/button_test3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="以屏幕中心为参照，不偏移（正中间）"/>

<Button android:id="@+id/button_test4"
android:layout_width<
ee9f
span style="line-height:1.5;color:rgb(0,0,255);">="fill_parent"
android:layout_height="wrap_content"
android:text="以屏幕下方为参照，下方中间"/>
</LinearLayout>

自定义对话框 popupwindow.xml

<?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="match_parent"
android:orientation="vertical" >

<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/textview"
android:textColor="#000000"
android:layout_margin="3dp"/>

<EditText  android:id="@+id/edit_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>

<LinearLayout android:gravity="center_horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent">

<Button android:id="@+id/button_ok"
android:text="@string/button_ok"
android:layout_width="100dp"
android:layout_height="50dp"
android:layout_marginRight="2dp"/>
<Button android:id="@+id/button_cancel"
android:text="@string/button_no"
android:layout_width="100dp"
android:layout_height="50dp"
android:layout_marginLeft="2dp"/>

</LinearLayout>

</LinearLayout>

顺便将popupWindow的背景重新定义了一下：rounded_corners_view.xml

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

<!-- solid 设置stroke设置的边框以内的颜色 -->
<solid android:color="#777777"/>
<!-- stroke主要设置组件的边框。width为边框宽度，color为边框颜色 -->
<stroke android:width="3dp" android:color="#ffffff" />
<!-- corners 设置边框四角弧度 -->
<corners android:radius="10dp"/>
<!-- padding主要设置组件里内容距离组件内边框的间距 -->
<padding android:left="3dp" android:top="3dp" android:right="3dp" android:bottom="3dp"/>

</shape>

主程序代码：

package com.example.test;
import android.os.Bundle; 

import android.app.Activity; 

import android.view.Gravity; 

import android.view.Menu; 

import android.view.View; 

import android.view.View.OnClickListener; 

import android.widget.Button; 

import android.widget.EditText; 

import android.widget.PopupWindow; 

import android.widget.TextView; 

import android.widget.Toast;
public class MainActivity extends Activity {//PopupWindow属于阻塞的对话框，AlertDialog属于不阻塞的对话框 

    private Button button_test1 = null; 

    private Button button_test2 = null; 

    private Button button_test3 = null; 

    private Button button_test4 = null; 

    private TextView tv = null; 

    private Button button_ok = null; 

    private Button button_cancel = null; 

    private PopupWindow popupWindow = null; 

    private int screenWidth = 0; 

    private int screenHeight = 0; 

    private int popupWindowWidth = 0; 

    private int popupWindowHeight = 0; 

    @Override 

    public void onCreate(Bundle savedInstanceState) { 

        super.onCreate(savedInstanceState); 

        setContentView(R.layout.activity_main); 

        initView(); 

    } 

    /** 

     * 初始化控件和设置响应事件 

     */ 

    private void initView(){ 

        button_test1 = (Button) findViewById(R.id.button_test1); 

        button_test1.setOnClickListener(new ButtonClickListener()); 

        button_test2 = (Button) findViewById(R.id.button_test2); 

        button_test2.setOnClickListener(new ButtonClickListener()); 

        button_test3 = (Button) findViewById(R.id.button_test3); 

        button_test3.setOnClickListener(new ButtonClickListener()); 

        button_test4 = (Button) findViewById(R.id.button_test4); 

        button_test4.setOnClickListener(new ButtonClickListener()); 

        tv = (TextView) findViewById(R.id.text_view); 

    } 

    /** 

     * 按钮点击事件 

     * 

     */ 

   private class ButtonClickListener implements OnClickListener { 

        @Override 

        public void onClick(View v) { 

            switch (v.getId()) { 

            case R.id.button_test1://以自己为Anchor，不偏移 

                getPopupWindow(); 

                popupWindow.showAsDropDown(v); 

                break; 

            case R.id.button_test2://以自己为Anchor，偏移偏移(screenWidth-dialgoWidth)/2, 0)--按钮正下方 

                getPopupWindow(); 

                popupWindow.showAsDropDown(v, (screenWidth-popupWindowWidth)/2, 0); 

                break; 

            case R.id.button_test3://以屏幕中心为参照，不偏移  

                getPopupWindow(); 

                popupWindow.showAtLocation(findViewById(R.id.layout), Gravity.CENTER, 0, 0); 

                break; 

            case R.id.button_test4: //以屏幕左下角为参照，偏移(screenWidth-dialgoWidth)/2, 0) --屏幕下方中央 

                getPopupWindow(); 

                popupWindow.showAtLocation(findViewById(R.id.layout), Gravity.BOTTOM, 0, 0); 

                break; 

            default: 

                break; 

            } 

        } 

    } 

   /* 

    * 获取PopupWindow实例 

    */ 

   private void getPopupWindow(){ 

       if(null != popupWindow){ 

            popupWindow.dismiss(); 

            return; 

        }else{ 

            initPopupWindow(); 

        } 

   } 

   /** 

    * 创建PopupWindow 

    */ 

   private void initPopupWindow(){ 

       //得到屏幕的宽度和高度 

       screenWidth = this.getWindowManager().getDefaultDisplay().getWidth(); 

       screenHeight = this.getWindowManager().getDefaultDisplay().getHeight(); 

       //获取自定义布局文件popupwindow.xml 

       View popupWindow_view = getLayoutInflater() 

                .inflate(R.layout.pupupwindow, null, false); 

       //设置其背景 

       popupWindow_view.setBackgroundResource(R.drawable.rounded_corners_view); 

       //创建popupWindow实例 

        popupWindow = new PopupWindow(popupWindow_view, screenWidth-40, screenHeight/3-20, true); 

//        popupWindow.setBackgroundDrawable(getResources().getDrawable(R.drawable.rounded_corners_pop)); 

        //获取视图中的按钮与编辑框 

        button_ok = (Button) popupWindow_view.findViewById(R.id.button_ok); 

        button_cancel = (Button) popupWindow_view.findViewById(R.id.button_cancel); 

        final EditText editText = (EditText) popupWindow_view.findViewById(R.id.edit_text); 

        button_ok.setOnClickListener(new OnClickListener() { 

            @Override 

            public void onClick(View v) { 

                //设置标签中的内容 

                tv.setText(editText.getText()); 

                editText.setText(""); 

                popupWindow.dismiss(); 

            } 

        }); 

        button_cancel.setOnClickListener(new OnClickListener() { 

            @Override 

            public void onClick(View v) { 

                editText.setText(""); 

                popupWindow.dismiss(); 

            } 

        }); 

        popupWindowHeight = popupWindow.getHeight(); 

        popupWindowWidth = popupWindow.getWidth(); 

   } 

}