≮转载≯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
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>

       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");
     }




 }