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：

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：

 

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>

<?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> 

       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");    
    }    
        
        
   
        
}