Android之PopupWindow弹出对话框

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

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，
     *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

<?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>  

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");   
    }   
       
       
  
       
}