弹出小窗口，PopupWindow的使用
在程序里弹出一个小窗口，像系统的MediaController一样，具体做法：先在mail.xml的layout布局里加一个id，这个到后面会用到的，
1
<?
xml version="1.0" encoding="utf-8"
?>
2
<
LinearLayout
xmlns:android
="http://schemas.android.com/apk/res/android"
3
android:orientation
="vertical"
4
android:layout_width
="fill_parent"
5
android:layout_height
="fill_parent"
6
android:id
="@+id/linear"
<!--这个一定要加--
>
7
>
接着布局文件里写一个control.xml文件，里面放一些要显示的widget，
1
<?
xml version="1.0" encoding="utf-8"
?>
2
<
LinearLayout
xmlns:android
="http://schemas.android.com/apk/res/android"
3
android:orientation
="vertical"
4
android:layout_width
="fill_parent"
5
android:layout_height
="fill_parent"
6
android:gravity
="center"
7
android:background
="#00000000"
8
>
9
<
LinearLayout
10
android:orientation
="horizontal"
11
android:layout_width
="fill_parent"
12
android:layout_height
="wrap_content"
13
android:gravity
="center_horizontal"
14
android:layout_marginTop
="5dip"
15
android:layout_marginBottom
="5dip"
16
>
17
<
ImageButton
18
android:id
="@+id/sounddown"
19
android:layout_width
="wrap_content"
20
android:layout_height
="wrap_content"
21
android:src
="@drawable/sounddown"
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/>
23
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<
TextView
25
android:id
="@+id/textNow"
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android:layout_width
="wrap_content"
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android:layout_height
="wrap_content"
28
android:textSize
="20sp"
29
android:text
=" "
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/>
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<
SeekBar
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android:id
="@+id/seekbar"
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android:layout_width
="500dip"
34
android:layout_height
="wrap_content"
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android:max
="10000"
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/>
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<
TextView
38
android:id
="@+id/textAll"
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android:layout_width
="wrap_content"
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android:layout_height
="wrap_content"
41
android:textSize
="20sp"
42
android:text
=" "
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/>
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<
ImageButton
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android:id
="@+id/soundup"
46
android:layout_width
="wrap_content"
47
android:layout_height
="wrap_content"
48
android:src
="@drawable/soundup"
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/>
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</
LinearLayout
>
51
<
LinearLayout
52
android:orientation
="horizontal"
53
android:layout_width
="fill_parent"
54
android:layout_height
="wrap_content"
55
android:gravity
="center_horizontal"
56
android:background
="#0000003D"
57
>
58
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</
LinearLayout
>
60
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</
LinearLayout
>
最后就是java文件，
1
public
class
MainActivity
extends
Activity {
2
/**
Called when the activity is first created.
*/
3
private
Button show;
4
public
PopupWindow mPopupWindow;
5
private
boolean
boo
=
true
;
6
@Override
7
public
void
onCreate(Bundle savedInstanceState) {
8
super
.onCreate(savedInstanceState);
9
setContentView(R.layout.main);
10
show
=
(Button) findViewById(R.id.button);
11
show.setOnClickListener(
new
Button.OnClickListener(){
12
13
@Override
14
public
void
onClick(View v) {
15
//
TODO Auto-generated method stub
16
if
(boo){
17
boo
=
false
;
18
check();
19
mPopupWindow.showAtLocation(findViewById(R.id.linear), Gravity.RIGHT
|
Gravity.BOTTOM,
0
,
0
);
20
}
else
{
21
boo
=
true
;
22
mPopupWindow.dismiss();
23
}
24
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}});
26
}
27
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private
void
check(){
29
if
(mPopupWindow
==
null
){
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mPopupWindow
=
new
PopupWindow(getLayoutInflater().inflate(R.layout.controler,
null
),LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT);
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}
32
if
(mPopupWindow.isShowing()){
33
mPopupWindow.dismiss();
34
}
35
}
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}