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Android PopupWindow 的使用

2024-07-24 05:31:42   220人阅读

在我理解其实PopupWindow其实类似于一个不能动的Widget(仅从显示效果来说!)。它是浮在别的窗口之上的.

 

下面我将给大家做一个简单的Demo，类似于音乐播放器的Widget的效果，点击Button的时候出来PopupWindow,首先我们看一下效果图:


下面是核心代码：

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package com.android.tutor; 
import android.app.Activity; 
import android.content.Context; 
import android.os.Bundle; 
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.PopupWindow; 
public class PopupWindowDemo extends Activity  implements OnClickListener{ 
     private Button btn; 
       
     public void onCreate(Bundle savedInstanceState) { 
         super .onCreate(savedInstanceState); 
         setContentView(R.layout.main); 
           
         btn = (Button)findViewById(R.id.btn); 
         btn.setOnClickListener( this ); 
     } 
     @Override 
     public void onClick(View v) { 
         Context mContext = PopupWindowDemo. this ; 
         if (v.getId() == R.id.btn) { 
             LayoutInflater mLayoutInflater = (LayoutInflater) mContext 
                     .getSystemService(LAYOUT_INFLATER_SERVICE); 
             View music_popunwindwow = mLayoutInflater.inflate( 
                     R.layout.music_popwindow, null ); 
             PopupWindow mPopupWindow = new PopupWindow(music_popunwindwow, LayoutParams.FILL_PARENT, 
                     LayoutParams.WRAP_CONTENT); 
               
             mPopupWindow.showAtLocation(findViewById(R.id.main), Gravity.RIGHT|Gravity.BOTTOM, 0 , 0 ); 
         } 
     } 
}

需要强调的是这里PopupWindow必须有某个事件触发才会显示出来，不然总会抱错，不信大家可以试试! 


随着这个问题的出现，就会同学问了，那么我想初始化让PopupWindow显示出来，那怎么办了，不去寄托于其他点击事件。在这里我用了定时器Timer来实现这样的效果,当然这里就要用到Handler了：

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package com.android.tutor; 
import java.util.Timer; 
import java.util.TimerTask; 
import android.app.Activity; 
import android.content.Context; 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.Message; 
import android.view.Gravity; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup.LayoutParams; 
import android.widget.PopupWindow; 
public class PopupWindowDemo extends Activity{ 
     private Handler mHandler = new Handler(){ 
           
         public void handleMessage(Message msg) { 
             switch (msg.what) { 
             case 1 : 
                 showPopupWindow(); 
                 break ; 
             } 
         }; 
     }; 
       
     public void onCreate(Bundle savedInstanceState) { 
         super .onCreate(savedInstanceState); 
         setContentView(R.layout.main); 
           
         //create the timer   
         Timer timer = new Timer(); 
         timer.schedule( new initPopupWindow(), 100 ); 
     } 
       
     private class initPopupWindow extends TimerTask{ 
         @Override 
         public void run() { 
               
             Message message = new Message(); 
             message.what = 1 ; 
             mHandler.sendMessage(message); 
               
         }        
     } 
       
       
     public void showPopupWindow() { 
         Context mContext = PopupWindowDemo. this ; 
         LayoutInflater mLayoutInflater = (LayoutInflater) mContext 
                 .getSystemService(LAYOUT_INFLATER_SERVICE); 
         View music_popunwindwow = mLayoutInflater.inflate( 
                 R.layout.music_popwindow, null ); 
         PopupWindow mPopupWindow = new PopupWindow(music_popunwindwow, 
                 LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT); 
         mPopupWindow.showAtLocation(findViewById(R.id.main), Gravity.CENTER, 0 , 0 ); 
     } 
}

效果如下图：

 

Android PopupWindow 的使用


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