Develop Reference

How to make a circular Button?

I'm a new to Android Development. While working on Android Studio 2.2, I tried to create a circular Button. As read from here, I tried to create a new Drawable Resource File. But I was unable to change Root Element to Shape. There was no such options. Could anyone help?

There are two solutions.
Floating Action Button: https://developer.android.com/reference/android/support/design/widget/FloatingActionButton.html
else:
You create a oval shape in xml.
and put that shape as background on button and make sure button have equal layout_height and layout_width.
Example:
oval_shape.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:dither="true"
android:shape="oval">
<solid android:color="#color/colorAccent"/>
</shape>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="1">
<Button
android:layout_width="60dp"
android:layout_height="60dp"
android:background="#drawable/oval_shape"/>
</FrameLayout>

No option is needed here. Just use <shape>.
Check this example:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<solid android:color="#color/colorPrimary" />
<corners android:radius="#dimen/btn_radius" />
</shape>

Use xml drawable like this:
Save the following contents as round_button.xml in drawable folder
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="false">
<shape android:shape="oval">
<solid android:color="#fa09ad"/>
</shape>
</item>
<item android:state_pressed="true">
<shape android:shape="oval">
<solid android:color="#c20586"/>
</shape>
</item>
And set it as background of Button in xml like this:
<Button
android:layout_width="50dp"
android:layout_height="50dp"
android:background="#drawable/round_button"
android:gravity="center_vertical|center_horizontal"
android:text="hello"
android:textColor="#fff" />

You are probably looking for the FloatingActionButton
It is available in the support-library.
The documation of the class.

Setting a gradient background to a button automatically resizes it

I am trying to set a gradient xml file as background to a button.But when i add the drawable xml file as background, the size of the button changes.The button is to the right of edittext and the size of the button becomes bigger than the edittext.
The code:
The button:
<Button
android:id="#+id/btndob"
android:layout_width="127dp"
android:textColor="#FFFFFF"
android:background="#drawable/button_clicked_selector"
android:layout_height="fill_parent"
android:text="SELECT DATE" />
button_clicked_selector.xml
<?xml version="1.0" encoding="utf-8" ?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="false" android:drawable="#drawable/button_gradient" />
<item android:state_pressed="true" android:drawable="#drawable/button_clicked_gradient" />
</selector>
button_gradient.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<!-- Gradient Bg for listrow -->
<gradient
android:startColor="#00aff0"
android:endColor="#0081b0"
android:angle="270" />
</shape>
button_clicked_gradient.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<!-- Gradient Bg for listrow -->
<gradient
android:startColor="#00aff0"
android:endColor="#00aff0"
android:angle="270" />
</shape>

Shadow in center on click image view

i am trying to show rounded shadow in center when status is pressed.
but it is giving full view (rectunglar) shadow in current case.
here is what i am trying...
1. left_button.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<shape >
<solid android:color="#ffffff"></solid>
</shape>
</item>
<item android:state_focused="true"><shape>
<solid android:color="#40454a"></solid>
</shape></item>
<item><shape>
<solid android:color="#40454a"></solid>
</shape></item>
</selector>
here is the xml layout where i am applying ...
<RelativeLayout
android:id="#+id/relative_activity_camera_bottom"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:gravity="center_vertical"
android:background="#layout/footer_color" >
<LinearLayout
android:id="#+id/bottom_layout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:background="#android:color/transparent"
android:gravity="center_vertical"
android:weightSum="1.0" >
<ImageView
android:id="#+id/captureImage"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="0.5"
android:background="#layout/left_button"
android:src="#layout/camera_image"
/>
<ImageView
android:id="#+id/recordButton"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="0.5"
android:src="#layout/videocamera_image"
android:background="#layout/left_button"
android:onClick="startRecording"
/>
</LinearLayout>
</RelativeLayout>
original condition-
current case- (but i want to show white only in center)

For example, use a selector :
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/gradient_round_press_effect" android:state_selected="true" android:state_window_focused="false"/>
<item android:drawable="#drawable/gradient_round_press_effect" android:state_selected="true"/>
<item android:drawable="#drawable/gradient_round_press_effect" android:state_pressed="true" android:state_selected="false"/>
<item android:drawable="#drawable/gradient_round_press_effect_inverse" android:state_selected="false"/>
</selector>
With two drawable shapes, the first when clicked (gradient_round_press_effect):
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<gradient
android:endColor="#color/clr_the_color_behind"
android:gradientRadius="130"
android:startColor="#66000000"
android:type="radial" />
</shape>
Adapt the size of the radius with the size of the button
For start color use #66FFFFFF if you want white (66 is for the transparency)
For end color maybe you can use transparent ? i didn't try this
and when not clicked define your own colors (gradient_round_press_effect_inverse) not really "inverse" but this is an example of another gradient. You can just use a color instead
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<gradient
android:angle="270"
android:centerColor="#color/clr_gradient2"
android:endColor="#color/clr_gradient1"
android:startColor="#color/clr_gradient3"
android:type="linear" />
</shape>

Selector for list view

I have a selector for different states of the list view. I have selected a grey colour for the background but its not working ,pressed state is working fine but my list view background is still white, and when I select the list item its colour changes to grey which I have chosen for the background and the background is still white.
Please help ,Sorry for the silly question as I am new to android.
My list view is:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="?android:attr/activatedBackgroundIndicator">
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:divider="#b5b5b5"
android:dividerHeight="1dp"
android:listSelector="#drawable/list_selector">
</ListView>
</FrameLayout>
Selector xml is:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_selected="false"
android:state_pressed="false"
android:drawable="#drawable/gradient_bg" />
<item android:state_pressed="true"
android:drawable="#drawable/gradient_bg_hover" />
<item android:state_selected="true"
android:state_pressed="false"
android:drawable="#drawable/gradient_bg_hover" />
</selector>
pressed_state xml is:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient
android:startColor="#78DDFF"
android:centerColor="#16cedb"
android:endColor="#09adb9"
android:angle="270" />
</shape>
background xml is:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient
android:startColor="#D5DDE0"
android:centerColor="#e7e7e8"
android:endColor="#CFCFCF"
android:angle="270" />
</shape>

Apply your selector to the ListView item, I mean the viewgroup of the row.xml or whatever name you have defined for the listview item.

Android gridview divider drawable between images

I have a gridview of images, i need to add one drawable image as a separator between images in gridview.
anyone help me how to add.?

try this hope help
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:background="#drawable/list_selector">
<!-- Cell contents -->
</LinearLayout>
list_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_selected="true"
android:drawable="#drawable/item_border_selected"
/>
<item
android:state_pressed="true"
android:drawable="#drawable/item_border_selected"
/>
<item
android:drawable="#drawable/item_border"
/>
</selector>
item_border.xml
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid
android:color="#android:color/transparent"
/>
<stroke
android:width="1px"
android:color="#color/list_divider"
/>
</shape>
item_border_selected.xml
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid
android:color="#color/list_select"
/>
<stroke
android:width="1px"
android:color="#color/list_divider"
/>
</shape>
items_view.xml
<?xml version="1.0" encoding="utf-8"?>
<GridView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginLeft="-1px"
android:layout_marginRight="-1px"
android:listSelector="#android:color/transparent"
/>
Since all lines double in size as they join their neighboring cells, I made the divider size 1px instead of 1dp so it doesn't appear too large on some screens. Also, I made the grid view have negative margins to hide the lines on either side. I hope this helps someone.from here