Android float button over scroll view

I have to开发者_JAVA技巧 put a button at a fix position(top-right) so that when I scroll the screen/view, the button is always visible. It's like a button floating over the view. The button is visible over the scroll view all the time.

I made a dummy app and it works here is the layout

<?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"
    >
    <RelativeLayout android:layout_width="match_parent" android:id="@+id/relativeLayout1" android:layout_height="wrap_content">
        <ScrollView android:id="@+id/scrollView1" android:layout_height="fill_parent" android:layout_width="fill_parent">
            <LinearLayout android:id="@+id/linearLayout1" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical">
                <RatingBar android:id="@+id/ratingBar1" android:layout_width="wrap_content" android:layout_weight="1" android:layout_height="wrap_content"></RatingBar>
                <Spinner android:layout_width="wrap_content" android:id="@+id/spinner1" android:layout_weight="1" android:layout_height="wrap_content"></Spinner>
                <Spinner android:layout_width="wrap_content" android:id="@+id/spinner2" android:layout_height="wrap_content" android:layout_weight="1"></Spinner>
                <SeekBar android:id="@+id/seekBar1" android:layout_height="wrap_content" android:layout_weight="1" android:layout_width="match_parent"></SeekBar>
                <QuickContactBadge android:layout_width="wrap_content" android:id="@+id/quickContactBadge1" android:layout_weight="1" android:layout_height="wrap_content"></QuickContactBadge>
                <RatingBar android:id="@+id/ratingBar2" android:layout_width="wrap_content" android:layout_weight="1" android:layout_height="wrap_content"></RatingBar>
                <RadioGroup android:layout_width="wrap_content" android:id="@+id/radioGroup1" android:layout_weight="1" android:layout_height="wrap_content">
                    <RadioButton android:text="RadioButton" android:layout_width="wrap_content" android:id="@+id/radio0" android:layout_height="wrap_content" android:checked="true"></RadioButton>
                    <RadioButton android:text="RadioButton" android:layout_width="wrap_content" android:id="@+id/radio1" android:layout_height="wrap_content"></RadioButton>
                    <RadioButton android:text="RadioButton" android:layout_width="wrap_content" android:id="@+id/radio2" android:layout_height="wrap_content"></RadioButton>
                </RadioGroup>
                <Spinner android:layout_width="match_parent" android:id="@+id/spinner3" android:layout_height="wrap_content" android:layout_weight="1"></Spinner>
                <TextView android:layout_width="wrap_content" android:id="@+id/textView1" android:layout_height="wrap_content" android:layout_weight="1" android:text="TextView" android:textAppearance="?android:attr/textAppearanceMedium"></TextView>
                <Button android:layout_width="wrap_content" android:text="Button" android:layout_height="wrap_content" android:layout_weight="1" android:id="@+id/button2"></Button>
                <ProgressBar android:layout_width="wrap_content" android:layout_weight="1" android:id="@+id/progressBar1" android:layout_height="wrap_content" style="?android:attr/progressBarStyleHorizontal"></ProgressBar>
                <RatingBar android:id="@+id/ratingBar3" android:layout_width="wrap_content" android:layout_weight="1" android:layout_height="wrap_content"></RatingBar>
                <QuickContactBadge android:layout_width="wrap_content" android:id="@+id/quickContactBadge2" android:layout_weight="1" android:layout_height="wrap_content"></QuickContactBadge>
                <Button android:layout_width="wrap_content" android:text="Button" android:layout_height="wrap_content" android:layout_weight="1" android:id="@+id/button3"></Button>
                <CheckBox android:layout_width="wrap_content" android:text="CheckBox" android:id="@+id/checkBox1" android:layout_height="wrap_content" android:layout_weight="1"></CheckBox>
            </LinearLayout>
        </ScrollView>
        <Button android:layout_height="wrap_content" android:text="Button" android:layout_width="wrap_content" android:id="@+id/button1"></Button>
    </RelativeLayout>
</LinearLayout>

You should have a relative layout. Inside the layout you will have a scrollview to fill the parent both in height and with and the button will be also inside the layout but it will have align with parent top to true...

this is the answer, if you have any questions ask again

I guess you are using xml files to define your layout. Then you need to define the button outside the ScrollView definition, for example:

<ScrollView
    ...>

    ...
</ScrollView>

<Button
   ...>
</Button>

Guys I know this is a old post just FYI, Google has come up with a library to support the a lot of cool stuff like float button, etc. Worth a look. Google Design Support Lib