Android高手进阶教程(十)-----Android(安卓)PopupWindow的使用!!!
16lz
2021-01-26
大家好,我们这一节讲的是Android PopupWindow的使用! 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:
view plain- packagecom.android.tutor;
- importandroid.app.Activity;
- importandroid.content.Context;
- importandroid.os.Bundle;
- importandroid.view.Gravity;
- importandroid.view.LayoutInflater;
- importandroid.view.View;
- importandroid.view.View.OnClickListener;
- importandroid.view.ViewGroup.LayoutParams;
- importandroid.widget.Button;
- importandroid.widget.PopupWindow;
- publicclassPopupWindowDemoextendsActivityimplementsOnClickListener{
- privateButtonbtn;
- publicvoidonCreate(BundlesavedInstanceState){
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- btn=(Button)findViewById(R.id.btn);
- btn.setOnClickListener(this);
- }
- @Override
- publicvoidonClick(Viewv){
- ContextmContext=PopupWindowDemo.this;
- if(v.getId()==R.id.btn){
- LayoutInflatermLayoutInflater=(LayoutInflater)mContext
- .getSystemService(LAYOUT_INFLATER_SERVICE);
- Viewmusic_popunwindwow=mLayoutInflater.inflate(
- R.layout.music_popwindow,null);
- PopupWindowmPopupWindow=newPopupWindow(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,如果大家不理解的可以返回
Android高手进阶教程(九)之----Android Handler的使用!!看一看,加深了解:
下面是核心代码:
view plain- packagecom.android.tutor;
- importjava.util.Timer;
- importjava.util.TimerTask;
- importandroid.app.Activity;
- importandroid.content.Context;
- importandroid.os.Bundle;
- importandroid.os.Handler;
- importandroid.os.Message;
- importandroid.view.Gravity;
- importandroid.view.LayoutInflater;
- importandroid.view.View;
- importandroid.view.ViewGroup.LayoutParams;
- importandroid.widget.PopupWindow;
- publicclassPopupWindowDemoextendsActivity{
- privateHandlermHandler=newHandler(){
- publicvoidhandleMessage(Messagemsg){
- switch(msg.what){
- case1:
- showPopupWindow();
- break;
- }
- };
- };
- publicvoidonCreate(BundlesavedInstanceState){
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- //createthetimer
- Timertimer=newTimer();
- timer.schedule(newinitPopupWindow(),100);
- }
- privateclassinitPopupWindowextendsTimerTask{
- @Override
- publicvoidrun(){
- Messagemessage=newMessage();
- message.what=1;
- mHandler.sendMessage(message);
- }
- }
- publicvoidshowPopupWindow(){
- ContextmContext=PopupWindowDemo.this;
- LayoutInflatermLayoutInflater=(LayoutInflater)mContext
- .getSystemService(LAYOUT_INFLATER_SERVICE);
- Viewmusic_popunwindwow=mLayoutInflater.inflate(
- R.layout.music_popwindow,null);
- PopupWindowmPopupWindow=newPopupWindow(music_popunwindwow,
- LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT);
- mPopupWindow.showAtLocation(findViewById(R.id.main),Gravity.CENTER,0,0);
- }
- }
效果如下图:
这样就可以初始化PopupWindow了,呵呵,这一节的布局文件有点多,如果大家想要源码的话,留下你们的Email,我会尽快发送给大家的
,今天就到这里,大家有什么不明白的欢迎留言!!!谢谢~
要源码的太多,我快崩溃了,所以上传了。下载地址: http://d.download.csdn.net/down/2871531/Android_Tutor
转自:http://blog.csdn.net/android_tutor/article/details/5576533
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