Android之PopupWindow弹出对话框

Android之PopupWindow弹出对话框

Android的对话框常用的有两种：PopupWindow和AlertDialog。

1. popupWindow是一个阻塞式的弹出框，这就意味着在我们退出这个弹出框之前，程序会一直等待，，这就意味着在我们退出这个弹出框之前，程序会一直等待， 
2.      *这和AlertDialog不同哦，AlertDialog是非阻塞式弹出框，AlertDialog弹出的时候，后台可是还可以做其他事情的哦。 

 

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（正数表示下方右边，负数表示（上方左边））
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：main.xml

main.xml

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:Android="http://schemas.android.com/apk/res/android"  
    Android:id="@+id/layout"  
    Android:orientation="vertical"  
    Android:layout_width="fill_parent"  
    Android:layout_height="fill_parent"  
    >  
<TextView    
    Android:id="@+id/tv_showText"  
    Android:layout_width="fill_parent"    
    Android:layout_height="wrap_content"    
    Android:gravity="center"  
    Android:text="@string/hello"  
    Android:textSize="22px"  
    />  
       
<Button  
    Android:id="@+id/bt_PopupWindow1"  
    Android:text="以自己为Anchor，不偏移"  
    Android:layout_width="fill_parent"    
    Android:layout_height="wrap_content"  
    />     
  
<Button  
    Android:id="@+id/bt_PopupWindow2"  
    Android:text="以自己为Anchor，正下方"  
    Android:layout_width="fill_parent"    
    Android:layout_height="wrap_content"  
    />     
       
<Button  
    Android:id="@+id/bt_PopupWindow3"  
    Android:text="以屏幕中心为参照，不偏移（正中间）"  
    Android:layout_width="fill_parent"    
    Android:layout_height="wrap_content"  
    />     
  
<Button  
    Android:id="@+id/bt_PopupWindow4"  
    Android:text="以屏幕下方为参照，下方中间"  
    Android:layout_width="fill_parent"    
    Android:layout_height="wrap_content"  
    />     
       
     
</LinearLayout>  

自定义对话框dialog.xml    

dialog.xml

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:Android="http://schemas.android.com/apk/res/android"  
    Android:orientation="vertical"  
    Android:layout_width="fill_parent"  
    Android:layout_height="fill_parent"  
    >  
<TextView    
    Android:id="@+id/tv_tip"  
    Android:layout_width="fill_parent"    
    Android:layout_height="wrap_content"    
    Android:text="请输入内容："  
    />  
     
 <EditText  
    Android:id="@+id/et_text"  
    Android:layout_width="fill_parent"    
    Android:layout_height="wrap_content"    
 ></EditText>    
    
<LinearLayout  
    Android:gravity="center_horizontal"    
    Android:layout_width="fill_parent"  
    Android:layout_height="fill_parent"  
>     
<Button  
    Android:id="@+id/bt_ok"  
    Android:text="确定"  
    Android:layout_width="100px"    
    Android:layout_height="50px"  
    />     
  
<Button  
    Android:id="@+id/bt_cancle"  
    Android:text="取消"  
    Android:layout_width="100px"    
    Android:layout_height="50px"  
    />     
</LinearLayout>  
</LinearLayout>  

?

import Android.app.Activity;   import Android.content.Context;   import Android.content.SharedPreferences.Editor;   import Android.os.Bundle;   import Android.util.Log;   import Android.view.Gravity;   import Android.view.LayoutInflater;   import Android.view.View;   import Android.view.View.OnClickListener;   import Android.view.ViewGroup.LayoutParams;   import Android.widget.Button;   import Android.widget.EditText;   import Android.widget.Gallery;   import Android.widget.PopupWindow;   import Android.widget.TextView;       public class PopupWindowTest extends Activity { //PopupWindow属于不阻塞的对话框，AlertDialog则是阻塞的。        private Button bt_popupWindow1;        private Button bt_popupWindow2;        private Button bt_popupWindow3;        private Button bt_popupWindow4;        private TextView tv_showText;        private PopupWindow popupWindow;        private int screenWidth;        private int screenHeight;        private int dialgoWidth;        private int dialgoheight;                     /** Called when the activity is first created. */       @Override       public void onCreate(Bundle savedInstanceState) {            super .onCreate(savedInstanceState);            setContentView(R.layout.main);                         initView();        }                 /**        * 初始化控件和响应事件        */       private void initView() {            bt_popupWindow1 = (Button)findViewById(R.id.bt_PopupWindow1);            bt_popupWindow2 = (Button)findViewById(R.id.bt_PopupWindow2);            bt_popupWindow3 = (Button)findViewById(R.id.bt_PopupWindow3);            bt_popupWindow4 = (Button)findViewById(R.id.bt_PopupWindow4);            tv_showText = (TextView)findViewById(R.id.tv_showText);                         bt_popupWindow1.setOnClickListener( new ClickEvent());            bt_popupWindow2.setOnClickListener( new ClickEvent());            bt_popupWindow3.setOnClickListener( new ClickEvent());            bt_popupWindow4.setOnClickListener( new ClickEvent());                                               }                 /**        * 按钮点击事件处理        * @author Kobi        *        */       private class ClickEvent implements OnClickListener {                         @Override           public void onClick(View v) {                // TODO Auto-generated method stub                switch (v.getId()) {                                     case R.id.bt_PopupWindow1:  //以自己为Anchor，不偏移                    getPopupWindow();                    popupWindow.showAsDropDown(v);                    break ;                                     case R.id.bt_PopupWindow2:  //以自己为Anchor，偏移(screenWidth-dialgoWidth)/2, 0)--按钮正下方                    getPopupWindow();                    popupWindow.showAsDropDown(v, (screenWidth-dialgoWidth)/ 2 , 0 );                    break ;                                     case R.id.bt_PopupWindow3:  //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.bt_PopupWindow4:  //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 ;                }            }                     }            /**        * 创建PopupWindow        */       protected void initPopuptWindow() {            // TODO Auto-generated method stub                                      View popupWindow_view = getLayoutInflater().inflate(    //获取自定义布局文件dialog.xml的视图                    R.layout.dialog, null , false );                         popupWindow = new PopupWindow(popupWindow_view, 200 , 150 , true ); //创建PopupWindow实例                         Button bt_ok = (Button)popupWindow_view.findViewById(R.id.bt_ok);   //dialog.xml视图里面的控件            Button bt_cancle = (Button)popupWindow_view.findViewById(R.id.bt_cancle);            final EditText et_text = (EditText)popupWindow_view.findViewById(R.id.et_text);                          bt_ok.setOnClickListener( new OnClickListener() {                                 @Override               public void onClick(View v) {                    // TODO Auto-generated method stub                    tv_showText.setText(et_text.getText()); //在标签里显示内容                    popupWindow.dismiss();                  //对话框消失                }            });                         bt_cancle.setOnClickListener( new OnClickListener() {                                 @Override               public void onClick(View v) {                    // TODO Auto-generated method stub                    popupWindow.dismiss();                }            });                         //获取屏幕和对话框各自高宽            screenWidth = PopupWindowTest. this .getWindowManager().getDefaultDisplay().getWidth();            screenHeight = PopupWindowTest. this .getWindowManager().getDefaultDisplay().getHeight();                dialgoWidth = popupWindow.getWidth();            dialgoheight = popupWindow.getHeight();                     }                 /*        * 获取PopupWindow实例        */       private void getPopupWindow() {                         if ( null != popupWindow) {                popupWindow.dismiss();                return ;            } else {                initPopuptWindow();            }        }            @Override       protected void onPause() {            // TODO Auto-generated method stub            super .onPause();            Log.e( "ActivityState" , "onPause" );        }            @Override       protected void onResume() {            // TODO Auto-generated method stub            super .onResume();            Log.e( "ActivityState" , "onResume" );        }                                  }