AndroidGUI08：RatingBar的常用技巧

RatingBar
其实也是一种
ProgressBar
，它是
ProgressBar
的间接派生类，因此
ProgressBar
可以用的方法，
RatingBar
都可以用。

1.

在布局文件
(main.xml)
中，增加界面元素声明如下：

<?
xml
version
=
"1.0"

encoding
=
"utf-8"

?>

<
LinearLayout
xmlns:android
=
"http://schemas.android.com/apk/res/android"

android:orientation
=
"vertical"

android:layout_width
=
"fill_parent"

android:layout_height
=
"fill_parent"

>

<
RatingBar

android:id
=
"@+id/ratebar"

android:layout_width
=
"wrap_content"

android:layout_height
=
"wrap_content"

android:numStars
=
"5"

android:stepSize
=
"0.1"

/>

<
TextView

android:id
=
"@+id/tv_ratebar"

android:layout_width
=
"wrap_content"

android:layout_height
=
"wrap_content"

android:text
=
""

/>

</
LinearLayout
>

2.

Activity
所对应的代码：

public

class
ControlRatingBar
extends
Activity

implements

OnRatingBarChangeListener

{

private
RatingBar
ratebar
;

@Override

public

void
onCreate(Bundle savedInstanceState)

{

super
.onCreate(savedInstanceState);

setContentView(R.layout.
main

);

ratebar
=
(RatingBar)findViewById(R.id.
ratebar

);

ratebar
.setOnRatingBarChangeListener(
this
);

}

public

void

onRatingChanged(RatingBar ratingBar,
float
rating,
boolean
fromUser)

{

((TextView)findViewById(R.id.
tv_ratebar

)).setText(
" "
+
rating);

}

}

运行结果
：