Android之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：

下面是运行程序截图：

程序代码：

布局：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

<?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>

 下面是详细代码：

package com.myAndroid.test;   
      
    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");   
        }   
                     
    }