标签：android style http color io os 使用 java ar
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
);
}
}
}
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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
);
}
}
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效果如下图：
标签：android style http color io os 使用 java ar
原文地址：http://my.oschina.net/yuanxulong/blog/318304
