转于:http://my.oschina.net/xsjayz/blog/184848#OSC_h2_5
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一、概述
1、构造方法
部分常用:
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PopupWindow(View contentView,
int
width,
int
height)
Create a
new
non focusable popup window which can display the contentView.
PopupWindow(View contentView,
int
width,
int
height,
boolean
focusable)
Create a
new
popup window which can display the contentView.
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contentView为要显示的view,width和height为宽和高,值为像素值,也可以是MATCHT_PARENT和WRAP_CONTENT。
focusable为是否可以获得焦点,也可以通过set方法设置:
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// Changes the focusability of the popup window
setFocusable(
boolean
focusable)
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根据网上的资料,focusable参数的主要作用是:
如果focusable为false,在一个Activity弹出一个PopupWindow,按返回键,由于PopupWindow没有焦点,会直接退出Activity。如果focusable为true,PopupWindow弹出后,所有的触屏和物理按键都由PopupWindow处理。
如果PopupWindow中有Editor的话,focusable要为true。
二、初始化PopupWindow
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/**
* 初始化rightPopupWindow
*/
private
PopupWindow initPopupWindow() {
LayoutInflater inflater = LayoutInflater.from(
this
);
View popView = inflater.inflate(R.layout.popupwindow_content,
null
);
TextView item = (TextView) popView.findViewById(R.id.text_item);
// 创建PopupWindow
final
PopupWindow popupWindow = createPopupWindow(popView);
popView.setOnTouchListener(
new
View.OnTouchListener() {
@Override
public
boolean
onTouch(View v, MotionEvent event) {
if
(rightPop !=
null
&& rightPop.isShowing()) {
popupWindow.dismiss();
}
return
true
;
}
});
item.setOnClickListener(
new
View.OnClickListener() {
@Override
public
void
onClick(View v) {
popupWindow.dismiss();
// ...
}
});
return
popupWindow;
}
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三、创建一个PopupWindow
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/**
* 创建PopupWindow
*
* @param popView
* 指定PopupWindow的内容
*/
private
PopupWindow createPopupWindow(View popView) {
PopupWindow popupInstance =
new
PopupWindow(popView, LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT);
popupInstance.setFocusable(
true
);
popupInstance.setBackgroundDrawable(
new
ColorDrawable(
0
));
popupInstance.setOutsideTouchable(
true
);
// 监听器
popupInstance.setOnDismissListener(
new
PopupWindow.OnDismissListener() {
@Override
public
void
onDismiss() {
// ...
}
});
return
popupInstance;
}
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四、显示
例如一个button,点击该按钮,显示popupWindow,并且要求popupWindow显示在该按钮下面,则
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btn.setOnClickListener(
new
View.OnClickListener() {
@Override
public
void
onClick(View v) {
PopupWindow popupWindow = ...;
popupWindow.showAsDropDown(v);
}
});
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另外,还支持指定位+置偏移量显示:
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public
void
showAsDropDown(View anchor,
int
xoff,
int
yoff);
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public
void
showAtLocation (View parent,
int
gravity,
int
x,
int
y)
Display the content view in a popup window at the specified location. If the popup window cannot fit on screen, it will be clipped. See WindowManager.LayoutParams
for
more information on how gravity and the x and y parameters are related. Specifying a gravity of NO_GRAVITY is similar to specifying Gravity.LEFT | Gravity.TOP.
Parameters
parent a parent view to get the getWindowToken() token from
gravity the gravity which controls the placement of the popup window
x the popup's x location offset
y the popup's y location offset
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五、popupWindow显示优化
1、动画效果
例如显示的时候,从底部出现或者从顶部出现等,可以添加自定义动画效果。
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<?
xml
version
=
"1.0"
encoding
=
"utf-8"
?>
<
set
xmlns:android
=
"http://schemas.android.com/apk/res/android"
>
<
translate
android:duration
=
"250"
android:fromYDelta
=
"100.0%"
android:toYDelta
=
"0.0"
/>
</
set
>
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<?
xml
version
=
"1.0"
encoding
=
"utf-8"
?>
<
set
xmlns:android
=
"http://schemas.android.com/apk/res/android"
>
<
translate
android:duration
=
"250"
android:fromYDelta
=
"0.0"
android:toYDelta
=
"100%"
/>
</
set
>
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2、其他效果
默认的popupWindow显示的时候,是没有像Dialog那样的背景变成灰色半透明效果的。可以自己添加类似Dialog或ios那样的效果。
例如,设置popupWindow的显示内容的布局文件的background属性为灰色半透明颜色,然后popupWindow在创建的时候指定宽、高属性为MATCH_PARENT即可实现除了popupWindow以外区域变成灰色半透明效果。
当然,这个灰色区域,其实也属于popupWindow,只是没有真正的内容。这时候如果需要设置点击popupWindow以外区域让它自动消失的话,就需要额外处理。因为点击灰色部分,你仍然点击的是popupWindow本身。
一种方法是给popupWindow的整个布局区域添加onTouch事件监听器,手动让popupWindow去dismiss()掉。