Develop Reference

Round button without corners in Android [duplicate]

MOCK UP
Requirement
I want to put custom button with selector.
Mock up is given above.
If anyone knows solution then share it.
Thank you.

basically you will need to create some new XML files and apply them to your Button element. As i can see from the mockup you will need a stroke and the background color with some shading effect applied, you can research more into the shading thing but the background color and the stroke is pretty straight forward.
Here is an example, done_rounded_btn.xml:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_pressed="true"
android:state_enabled="true"
android:drawable="#drawable/zzzzzzzzz_btn_orange" />
<item
android:state_focused="true"
android:state_enabled="true"
android:drawable="#drawable/zzzzzzzzz_btn_orange" />
<item
android:state_focused="false"
android:state_enabled="false"
android:drawable="#drawable/zzzzzzzzz_btn_inactiv" />
<item android:drawable="#drawable/zzzzzzzzz_btn_black"/>
</selector>
for the selection part and then you create the custom drawables corresponding to the mockup.
An example, zzzzzzzzzz_btn_orange:
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<solid
android:color="#color/done_color">
</solid>
<corners
android:bottomLeftRadius="3dp"
android:bottomRightRadius="3dp"
android:topLeftRadius="3dp"
android:topRightRadius="3dp" />
</shape>
And then add it to your button as background, main.xml:
<Button
android:id="#+id/registers_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginBottom="10dp"
android:layout_marginLeft="15dp"
android:layout_marginTop="10dp"
android:background="#drawable/done_rounded_btn"
android:text="#string/done_txt"
android:textColor="#color/white"
android:textSize="15sp" />
Hope this helps!

You can use this instead of standard Button and set selector as background in xml:
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.Button;
/**
* Custom Shape Button which ignores touches on transparent background.
*/
public class ButtonWithUntouchableTransparentBg extends Button {
public ButtonWithUntouchableTransparentBg(Context context) {
this(context, null);
}
public ButtonWithUntouchableTransparentBg(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ButtonWithUntouchableTransparentBg(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setDrawingCacheEnabled(true);
}
#Override
public boolean onTouchEvent(MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
// ignores touches on transparent background
if (isPixelTransparent(x, y))
return true;
else
return super.onTouchEvent(event);
}
/**
* #return true if pixel from (x,y) is transparent
*/
private boolean isPixelTransparent(int x, int y) {
Bitmap bmp = Bitmap.createBitmap(getDrawingCache());
int color = Color.TRANSPARENT;
try {
color = bmp.getPixel(x, y);
} catch (IllegalArgumentException e) {
// x or y exceed the bitmap's bounds.
// Reverts the View's internal state from a previously set "pressed" state.
setPressed(false);
}
// Ignores touches on transparent background.
if (color == Color.TRANSPARENT)
return true;
else
return false;
}
}

You can also create a shape that is using a selector inside. If your shape is just changing its color in different states, this is a lot cleaner.
color/color_selector.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="#color/blue_dark" android:state_pressed="true" />
<item android:color="#color/blue_light" />
</selector>
drawable/shape.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#color/color_selector" />
<corners android:bottomLeftRadius="6dip" android:bottomRightRadius="6dp" />
<padding android:bottom="0dip" android:left="0dip" android:right="0dip" android:top="0dip" />
</shape>

Button with rounded corners with two states (enabled/disabled):
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_enabled="true">
<shape android:shape="rectangle">
<corners android:radius="28dp" />
<solid android:color="#color/white" />
<stroke android:width="1dp" android:color="#color/orange" />
</shape>
</item>
<item android:state_enabled="false">
<shape android:shape="rectangle">
<corners android:radius="28dp" />
<solid android:color="#color/grey_card_background" />
<stroke android:width="1dp" android:color="#color/grey" />
</shape>
</item>
</selector>

inside your item put the shape in the selector XML
EX FROM MY CODE :
<!-- if pressed -->
<item android:state_pressed="true"><shape android:padding="10dp" android:shape="rectangle">
<solid android:color="#color/blue" />
<corners android:bottomLeftRadius="10dp" android:bottomRightRadius="10dp" android:topLeftRadius="10dp" android:topRightRadius="10dp" />
</shape></item>
<!-- if not pressed -->
<item><shape android:padding="10dp" android:shape="rectangle">
<solid android:color="#color/Purbble" />
<corners android:bottomLeftRadius="10dp" android:bottomRightRadius="10dp" android:topLeftRadius="10dp" android:topRightRadius="10dp" />
</shape></item>

Android: Add divider between items in RecyclerView

I am using RecyclerView with rounded corner, to make it rounded corner I used below XML:
view_rounded.xml:-
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#008f8471"/>
<stroke android:width="2dp" android:color="#ffffff" />
<corners android:radius="10dp"/>
</shape>
fragment_main.xml:-
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/view_rounded"/>
adapter_main.xml:-
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/textTitle"
style="#style/AppTheme.ListTextView"
/>
</LinearLayout>
style.xml:-
<style name="AppTheme.ListTextView" parent="android:Widget.Material.TextView">
<item name="android:gravity">left</item>
<item name="android:layout_width">match_parent</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:textAllCaps">false</item>
<item name="android:padding">10dp</item>
<item name="android:textAppearance">#android:style/TextAppearance.DeviceDefault.Medium</item>
<item name="android:textColor">#color/tabsScrollColor</item>
<item name="android:textStyle">bold</item>
</style>
Getting (without item separator):
Required (with item separator):

you should try add Divider
mListview.addItemDecoration(new DividerItemDecoration(this.getActivity(), LinearLayout.VERTICAL));

I have done this way:
onCreateView() of Fragment:
RecyclerView recyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerView);
recyclerView.addItemDecoration(new SimpleDividerItemDecoration(getActivity()));
SimpleDividerItemDecoration.java:
public class SimpleDividerItemDecoration extends RecyclerView.ItemDecoration {
private Drawable mDivider;
public SimpleDividerItemDecoration(Context context) {
mDivider = context.getResources().getDrawable(R.drawable.recycler_horizontal_divider);
}
#Override
public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
int left = parent.getPaddingLeft();
int right = parent.getWidth() - parent.getPaddingRight();
int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++) {
View child = parent.getChildAt(i);
RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
int top = child.getBottom() + params.bottomMargin;
int bottom = top + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
}
recycler_horizontal_divider.xml:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<size
android:width="1dp"
android:height="1dp" />
<solid android:color="#2EC590" />
</shape>
Hope this will help you.

RecyclerView works different from ListViews. You need to add ItemDecorators for the recycler view. As the docs says,
An ItemDecoration allows the application to add a special drawing and layout offset to specific item views from the adapter's data set. This can be useful for drawing dividers between items, highlights, visual grouping boundaries and more.
Take a look into this link : https://developer.android.com/reference/android/support/v7/widget/RecyclerView.ItemDecoration.html

Well what I did to achieve this is, I first created layout for my adapter row as
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<View
android:id="#+id/lineView"
android:layout_width="match_parent"
android:layout_height="2px"
android:background="#android:color/black"/>
<TextView
android:id="#+id/textTitle"
style="#style/AppTheme.ListTextView"
/>
</LinearLayout>
Then in my adapter I checked for first row and changed its viewLine Visibility to invisible
#Override
public void onBindViewHolder(ChildInfoViewHolder holder, final int position) {
if(position == 0){
holder.viewLine.setVisibility(View.INVISIBLE);
}
//...
}
public static class MyViewHolder extends RecyclerView.ViewHolder{
protected View viewLine;
public ChildInfoViewHolder(View view) {
super(view);
viewLine = view.findViewById(R.id.viewLine);
//...
}
}

To add dividers to your recyclerview you need to use decorator - https://gist.github.com/alexfu/0f464fc3742f134ccd1e after you add that to your project add a line
recyclerView.addItemDecoration(new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL_LIST));

This line of code worked for me:
recyclerView.addItemDecoration(new DividerItemDecoration(context, DividerItemDecoration.HORIZONTAL));
For vertical line, pass second argument as DividerItemDecoration.VERTICAL.

Set the selector at the background of the list item in your layout if you are using custom adapter

Try this one:
A very nice solution by Michel-F. Portzert
public class ClippedListView extends ListView {
public ClippedListView(Context context) {
super(context);
}
public ClippedListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
#Override
protected void dispatchDraw(Canvas canvas) {
float radius = 10.0f;
Path clipPath = new Path();
RectF rect = new RectF(0, 0, this.getWidth(), this.getHeight());
clipPath.addRoundRect(rect, radius, radius, Path.Direction.CW);
canvas.clipPath(clipPath);
super.dispatchDraw(canvas);
}
}

Try This From
Reference
Android: ListView with rounded corners
First off, we need the drawables for the backgrounds of the Lists entries:
For the entries in the middle of the list, we don't need rounded corners, so create a xml in your drawable folder "list_entry_middle.xml" with following content:
<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<stroke android:width="1px" android:color="#ffbbbbbb" />
</shape>
</item>
<item android:bottom="1dp" android:left="1dp" android:right="1dp">
<shape >
<solid android:color="#ffffffff" />
</shape>
</item>
</layer-list>
For the rounded corners, create another xml, "rounded_corner_top.xml":
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<stroke android:width="1dp" android:color="#ffbbbbbb" />
<corners android:topLeftRadius="20dp"
android:topRightRadius="20dp"
/>
</shape>
</item>
<item android:top="1dp" android:left="1dp" android:right="1dp" android:bottom="1dp">
<shape >
<solid android:color="#ffffffff" />
<corners android:topLeftRadius="20dp"
android:topRightRadius="20dp"
/>
</shape>
</item>
</layer-list>
Implementing the bottom part is quite the same, just with bottomLeftRadius and bottomRightRadius. (maybe also create one with all corners rounded, if the list only has one entry)
For better usability, also provide drawables with other colors for the different states, that the list item can have and reference them in another xml in the drawable folder ("selector_rounded_corner_top.xml") as followed:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/rounded_corner_top_click"
android:state_pressed="true" />
<item android:drawable="#drawable/rounded_corner_top_click"
android:state_focused="true" />
<item android:drawable="#drawable/rounded_corner_top" />
</selector>
Now do the same for the other backgrounds of the list.
All that is left now, is to assign the right backgrounds in our ListAdapter like following:
#Override
public View getView(int position, View convertView, ViewGroup parent) {
//...
//skipping the view reuse stuff
if (position == 0 && entry_list.size() == 1) {
view.setBackgroundResource(R.drawable.selector_rounded_corner);
} else if (position == 0) {
view.setBackgroundResource(R.drawable.selector_rounded_corner_top);
} else if (position == entry_list.size() - 1) {
view.setBackgroundResource(R.drawable.selector_rounded_corner_bottom);
} else {
view.setBackgroundResource(R.drawable.selector_middle);
}
//...
//skipping the filling of the view
}

Modify your ListView like below.Add the list_bg as the background of your ListView Also specify some padding for the top and the bottom of the listView otherwise the 1st and the last item in the list will overlap with the rounded corners showing rectangular corners.
<ListView
android:id="#+id/listView"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:background="#drawable/list_bg"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:fastScrollEnabled="true"
android:choiceMode="singleChoice" />

Use this drawable xml for curve shape listview and set background to your list view or any layout:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:radius="6dp" />
<padding android:bottom="3dp" android:left="3dp" android:right="3dp" android:top="3dp" />
</shape>

Try this
custom_rounded_list.xml :
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient
android:startColor="#ff2521"
android:endColor="#2f5511"
android:angle="270"/>
<padding
android:bottom="5dp"
android:left="5dp"
android:right="5dp"
android:top="5dp" />
<corners
android:bottomRightRadius="7dp"
android:bottomLeftRadius="7dp"
android:topLeftRadius="7dp"
android:topRightRadius="7dp" />
</shape>
Your listview:
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/mylst"
android:background="#drawable/custom_rounded_list" />

you are setting list_selector for both textview and listview background. Use list_selector only for listview and if you want hover effect on textview too, then create another list_selector_textview which haven't include the <corners android:radius="10dp" property.

The problem is because you are setting the background with corners not only to the list view, but also to the item. You should make separate backgrounds for item (with selector) and one for list view with corners.
list_bg.xml
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#008f8471"/>
<stroke android:width="1dip" android:color="#ffffff" />
<corners android:radius="10dp"/>
<padding android:left="0dip" android:top="0dip" android:right="0dip" android:bottom="0dip" />
</shape>
Now you can setup this drawable as the background of your list view.
<ListView
android:id="#+id/listView"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:background="#drawable/list_bg.xml"
android:fastScrollEnabled="true"
android:choiceMode="singleChoice" />
And for list view item you can use selector to have hover functionality:
list_item_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/list_item_selected" android:state_pressed="true"/>
<item android:drawable="#drawable/list_item_selected" android:state_pressed="false" android:state_selected="true"/>
<item android:drawable="#android:color/transparent"/>
Where list_item_selected is :
list_item_selected.xml
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#4d8f8471"/>
<stroke android:width="1dip" android:color="#ffffff" />
</shape>
And after that you can setup this selector to the item in your xml:
<TextView
android:id="#+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/list_item_selector" />
So your list view will have always same background with corners, and the background of items of list view, will be without corners and will be changed in pressed or selected state.

Just One Line...
recyclerView.addItemDecoration(new DividerItemDecoration(getActivity(), null));
That's all

Try this
recyclerView.apply {
....
addItemDecoration(DividerItemDecoration(context, DividerItemDecoration.VERTICAL))
}

Images with rounded corners in a ListView

I have developed an rss application. I want the ListView which contains the titles and images to have the images with rounded corners. I have taken a sample code online, but the problem is that the images are still rectangular. The weird part is that I have a sliding menu, when toggled it pushes the rss ListView away, while it's being pushed the images have round corners! when they stop their pushing animation the become rectangular again. It's a pretty weird problem for me so any help?
Rounded Image class:
public class RoundedImageView extends ImageView
{
private float radius = 20.0f;
public RoundedImageView(Context context)
{
super(context);
}
public RoundedImageView(Context context,AttributeSet attrs)
{
super(context,attrs);
}
public RoundedImageView(Context context,AttributeSet attrs,int defStyle)
{
super(context,attrs,defStyle);
}
#SuppressLint("DrawAllocation")
#Override
protected void onDraw(Canvas canvas)
{
Path clipPath = new Path();
RectF rect = new RectF(0,0,getWidth(), getHeight());
clipPath.addRoundRect(rect, radius, radius, Path.Direction.CW);
canvas.clipPath(clipPath);
super.onDraw(canvas);
}
}

Try this way: create rounded_corner.xml file into drawable\rounded_corner.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<solid android:color="#101010" />
<stroke
android:width="1dp"
android:color="#808080" />
<corners android:radius="15dp" />
And set as Background to your ImageView like
android:background="#drawable\rounded_corner"
And also set your RSS image to ImageView as a Src or a Bitmap like:
imageview.setBitmap(yourrssimage);

use rounded corner image or create xml and set as background image on imageview.

Create one XML like below in your drawable folder.
button_back.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_enabled="false"
android:drawable="#color/grey">
<shape>
<solid
android:color="#ef4444" />
<stroke
android:width="1dp"
android:color="#992f2f" />
<corners
android:radius="16dp" />
</shape>
</item>
and then apply to your button like this.
<Button
android:text="#string/press_me"
android:layout_margin="12dp"
android:layout_width="fill_parent"
android:layout_height="30dp"
android:background="#drawable/button_back"
/>

Create a stroke and list it as your imageview background
<?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="5dip" android:color="#android:color/transparent" />
<corners android:radius="5dip"/>
<padding android:left="0dip" android:top="0dip" android:right="0dip" android:bottom="0dip" />
</shape>
And in your imageview xml
android:background="#drawable/your_stroke_xml"

How to create custom shape button with selector in android?

MOCK UP
Requirement
I want to put custom button with selector.
Mock up is given above.
If anyone knows solution then share it.
Thank you.

basically you will need to create some new XML files and apply them to your Button element. As i can see from the mockup you will need a stroke and the background color with some shading effect applied, you can research more into the shading thing but the background color and the stroke is pretty straight forward.
Here is an example, done_rounded_btn.xml:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_pressed="true"
android:state_enabled="true"
android:drawable="#drawable/zzzzzzzzz_btn_orange" />
<item
android:state_focused="true"
android:state_enabled="true"
android:drawable="#drawable/zzzzzzzzz_btn_orange" />
<item
android:state_focused="false"
android:state_enabled="false"
android:drawable="#drawable/zzzzzzzzz_btn_inactiv" />
<item android:drawable="#drawable/zzzzzzzzz_btn_black"/>
</selector>
for the selection part and then you create the custom drawables corresponding to the mockup.
An example, zzzzzzzzzz_btn_orange:
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<solid
android:color="#color/done_color">
</solid>
<corners
android:bottomLeftRadius="3dp"
android:bottomRightRadius="3dp"
android:topLeftRadius="3dp"
android:topRightRadius="3dp" />
</shape>
And then add it to your button as background, main.xml:
<Button
android:id="#+id/registers_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginBottom="10dp"
android:layout_marginLeft="15dp"
android:layout_marginTop="10dp"
android:background="#drawable/done_rounded_btn"
android:text="#string/done_txt"
android:textColor="#color/white"
android:textSize="15sp" />
Hope this helps!

You can use this instead of standard Button and set selector as background in xml:
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.Button;
/**
* Custom Shape Button which ignores touches on transparent background.
*/
public class ButtonWithUntouchableTransparentBg extends Button {
public ButtonWithUntouchableTransparentBg(Context context) {
this(context, null);
}
public ButtonWithUntouchableTransparentBg(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ButtonWithUntouchableTransparentBg(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setDrawingCacheEnabled(true);
}
#Override
public boolean onTouchEvent(MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
// ignores touches on transparent background
if (isPixelTransparent(x, y))
return true;
else
return super.onTouchEvent(event);
}
/**
* #return true if pixel from (x,y) is transparent
*/
private boolean isPixelTransparent(int x, int y) {
Bitmap bmp = Bitmap.createBitmap(getDrawingCache());
int color = Color.TRANSPARENT;
try {
color = bmp.getPixel(x, y);
} catch (IllegalArgumentException e) {
// x or y exceed the bitmap's bounds.
// Reverts the View's internal state from a previously set "pressed" state.
setPressed(false);
}
// Ignores touches on transparent background.
if (color == Color.TRANSPARENT)
return true;
else
return false;
}
}

You can also create a shape that is using a selector inside. If your shape is just changing its color in different states, this is a lot cleaner.
color/color_selector.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="#color/blue_dark" android:state_pressed="true" />
<item android:color="#color/blue_light" />
</selector>
drawable/shape.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#color/color_selector" />
<corners android:bottomLeftRadius="6dip" android:bottomRightRadius="6dp" />
<padding android:bottom="0dip" android:left="0dip" android:right="0dip" android:top="0dip" />
</shape>

Button with rounded corners with two states (enabled/disabled):
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_enabled="true">
<shape android:shape="rectangle">
<corners android:radius="28dp" />
<solid android:color="#color/white" />
<stroke android:width="1dp" android:color="#color/orange" />
</shape>
</item>
<item android:state_enabled="false">
<shape android:shape="rectangle">
<corners android:radius="28dp" />
<solid android:color="#color/grey_card_background" />
<stroke android:width="1dp" android:color="#color/grey" />
</shape>
</item>
</selector>

inside your item put the shape in the selector XML
EX FROM MY CODE :
<!-- if pressed -->
<item android:state_pressed="true"><shape android:padding="10dp" android:shape="rectangle">
<solid android:color="#color/blue" />
<corners android:bottomLeftRadius="10dp" android:bottomRightRadius="10dp" android:topLeftRadius="10dp" android:topRightRadius="10dp" />
</shape></item>
<!-- if not pressed -->
<item><shape android:padding="10dp" android:shape="rectangle">
<solid android:color="#color/Purbble" />
<corners android:bottomLeftRadius="10dp" android:bottomRightRadius="10dp" android:topLeftRadius="10dp" android:topRightRadius="10dp" />
</shape></item>

How to show shadow around the linearlayout in Android?

How can I show shadow for my linear layout. I want white colored rounded background with shadow around the linearlayout. I have done this so far.
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:background="#xml/rounded_rect_shape"
android:orientation="vertical"
android:padding="10dp">
<-- My buttons, textviews, Imageviews go here -->
</LinearLayout>
And rounded_rect_shape.xml under xml directory
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<solid android:color="#ffffff" />
<corners
android:bottomLeftRadius="3dp"
android:bottomRightRadius="3dp"
android:topLeftRadius="3dp"
android:topRightRadius="3dp" />
</shape>

There is also another solution to the problem by implementing a layer-list that will act as the background for the LinearLayoout.
Add background_with_shadow.xml file to res/drawable. Containing:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item >
<shape
android:shape="rectangle">
<solid android:color="#android:color/darker_gray" />
<corners android:radius="5dp"/>
</shape>
</item>
<item android:right="1dp" android:left="1dp" android:bottom="2dp">
<shape
android:shape="rectangle">
<solid android:color="#android:color/white"/>
<corners android:radius="5dp"/>
</shape>
</item>
</layer-list>
Then add the the layer-list as background in your LinearLayout.
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/background_with_shadow"/>

Well, this is easy to achieve .
Just build a GradientDrawable that comes from black and goes to a transparent color, than use parent relationship to place your shape close to the View that you want to have a shadow, then you just have to give any values to height or width .
Here is an example, this file have to be created inside res/drawable , I name it as shadow.xml :
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient
android:startColor="#9444"
android:endColor="#0000"
android:type="linear"
android:angle="90"> <!-- Change this value to have the correct shadow angle, must be multiple from 45 -->
</gradient>
</shape>
Place the following code above from a LinearLayout , for example, set the android:layout_width and android:layout_height to fill_parent and 2.3dp, you'll have a nice shadow effect on your LinearLayout .
<View
android:id="#+id/shadow"
android:layout_width="fill_parent"
android:layout_height="2.3dp"
android:layout_above="#+id/id_from_your_LinearLayout"
android:background="#drawable/shadow">
</View>
Note 1: If you increase android:layout_height more shadow will be shown .
Note 2: Use android:layout_above="#+id/id_from_your_LinearLayout" attribute if you are placing this code inside a RelativeLayout, otherwise ignore it.
Hope it help someone.

There is no such attribute in Android, to show a shadow. But possible ways to do it are:
Add a plain LinearLayout with grey color, over which add your actual layout, with margin at bottom and right equal to 1 or 2 dp
Have a 9-patch image with a shadow and set it as the background to your Linear layout

For lollipop and above you can use elevation.
For older versions:
Here is a lazy hack from:
http://odedhb.blogspot.com/2013/05/android-layout-shadow-without-9-patch.html
(toast_frame does not work on KitKat, shadow was removed from toasts)
just use:
android:background="#android:drawable/toast_frame"
or:
android:background="#android:drawable/dialog_frame"
as a background
examples:
<TextView
android:layout_width="fill_parent"
android:text="I am a simple textview with a shadow"
android:layout_height="wrap_content"
android:textSize="18sp"
android:padding="16dp"
android:textColor="#fff"
android:background="#android:drawable/toast_frame"
/>
and with different bg color:
<LinearLayout
android:layout_height="64dp"
android:layout_width="fill_parent"
android:gravity="center"
android:background="#android:drawable/toast_frame"
android:padding="4dp"
>
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="Button shadow"
android:background="#33b5e5"
android:textSize="24sp"
android:textStyle="bold"
android:textColor="#fff"
android:layout_gravity="center|bottom"
/>
</LinearLayout>

Try this.. layout_shadow.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<solid android:color="#CABBBBBB"/>
<corners android:radius="2dp" />
</shape>
</item>
<item
android:left="0dp"
android:right="0dp"
android:top="0dp"
android:bottom="2dp">
<shape android:shape="rectangle">
<solid android:color="#android:color/white"/>
<corners android:radius="2dp" />
</shape>
</item>
</layer-list>
Apply to your layout like this
android:background="#drawable/layout_shadow"

I know this is old, but most of these answers require a ton of extra code.
If you have a light colored background, you can simply use this:
android:elevation="25dp"

Actually I agree with #odedbreiner but I put the dialog_frame inside the first layer and hide the black background under the white layer.
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:drawable="#android:drawable/dialog_frame"
android:right="2dp" android:left="2dp" android:bottom="2dp" android:top="5dp" >
<shape android:shape="rectangle">
<corners android:radius="5dp"/>
</shape>
</item>
<item>
<shape
android:shape="rectangle">
<solid android:color="#android:color/white"/>
<corners android:radius="5dp"/>
</shape>
</item>
</layer-list>

save this 9.png. (change name it to 9.png)
2.save it in your drawable.
3.set it to your layout.
4.set padding.
For example :
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#drawable/shadow"
android:paddingBottom="6dp"
android:paddingLeft="5dp"
android:paddingRight="5dp"
android:paddingTop="6dp"
>
.
.
.
</LinearLayout>

Create a new XML by example named "shadow.xml" at DRAWABLE with the following code (you can modify it or find another better):
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<solid android:color="#color/middle_grey"/>
</shape>
</item>
<item android:left="2dp"
android:right="2dp"
android:bottom="2dp">
<shape android:shape="rectangle">
<solid android:color="#color/white"/>
</shape>
</item>
</layer-list>
After creating the XML in the LinearLayout or another Widget you want to create shade, you use the BACKGROUND property to see the efect. It would be something like :
<LinearLayout
android:orientation="horizontal"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:paddingRight="#dimen/margin_med"
android:background="#drawable/shadow"
android:minHeight="?attr/actionBarSize"
android:gravity="center_vertical">

You can use following class for xml tag:
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.Rect;
import android.os.Build;
import android.support.annotation.FloatRange;
import android.util.AttributeSet;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.widget.FrameLayout;
import com.webappmate.weeassure.R;
/**
* Created by GIGAMOLE on 13.04.2016.
*/
public class ShadowLayout extends FrameLayout {
// Default shadow values
private final static float DEFAULT_SHADOW_RADIUS = 30.0F;
private final static float DEFAULT_SHADOW_DISTANCE = 15.0F;
private final static float DEFAULT_SHADOW_ANGLE = 45.0F;
private final static int DEFAULT_SHADOW_COLOR = Color.DKGRAY;
// Shadow bounds values
private final static int MAX_ALPHA = 255;
private final static float MAX_ANGLE = 360.0F;
private final static float MIN_RADIUS = 0.1F;
private final static float MIN_ANGLE = 0.0F;
// Shadow paint
private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG) {
{
setDither(true);
setFilterBitmap(true);
}
};
// Shadow bitmap and canvas
private Bitmap mBitmap;
private final Canvas mCanvas = new Canvas();
// View bounds
private final Rect mBounds = new Rect();
// Check whether need to redraw shadow
private boolean mInvalidateShadow = true;
// Detect if shadow is visible
private boolean mIsShadowed;
// Shadow variables
private int mShadowColor;
private int mShadowAlpha;
private float mShadowRadius;
private float mShadowDistance;
private float mShadowAngle;
private float mShadowDx;
private float mShadowDy;
public ShadowLayout(final Context context) {
this(context, null);
}
public ShadowLayout(final Context context, final AttributeSet attrs) {
this(context, attrs, 0);
}
public ShadowLayout(final Context context, final AttributeSet attrs, final int defStyleAttr) {
super(context, attrs, defStyleAttr);
setWillNotDraw(false);
setLayerType(LAYER_TYPE_HARDWARE, mPaint);
// Retrieve attributes from xml
final TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.ShadowLayout);
try {
setIsShadowed(typedArray.getBoolean(R.styleable.ShadowLayout_sl_shadowed, true));
setShadowRadius(
typedArray.getDimension(
R.styleable.ShadowLayout_sl_shadow_radius, DEFAULT_SHADOW_RADIUS
)
);
setShadowDistance(
typedArray.getDimension(
R.styleable.ShadowLayout_sl_shadow_distance, DEFAULT_SHADOW_DISTANCE
)
);
setShadowAngle(
typedArray.getInteger(
R.styleable.ShadowLayout_sl_shadow_angle, (int) DEFAULT_SHADOW_ANGLE
)
);
setShadowColor(
typedArray.getColor(
R.styleable.ShadowLayout_sl_shadow_color, DEFAULT_SHADOW_COLOR
)
);
} finally {
typedArray.recycle();
}
}
#Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
// Clear shadow bitmap
if (mBitmap != null) {
mBitmap.recycle();
mBitmap = null;
}
}
public boolean isShadowed() {
return mIsShadowed;
}
public void setIsShadowed(final boolean isShadowed) {
mIsShadowed = isShadowed;
postInvalidate();
}
public float getShadowDistance() {
return mShadowDistance;
}
public void setShadowDistance(final float shadowDistance) {
mShadowDistance = shadowDistance;
resetShadow();
}
public float getShadowAngle() {
return mShadowAngle;
}
#SuppressLint("SupportAnnotationUsage")
#FloatRange
public void setShadowAngle(#FloatRange(from = MIN_ANGLE, to = MAX_ANGLE) final float shadowAngle) {
mShadowAngle = Math.max(MIN_ANGLE, Math.min(shadowAngle, MAX_ANGLE));
resetShadow();
}
public float getShadowRadius() {
return mShadowRadius;
}
public void setShadowRadius(final float shadowRadius) {
mShadowRadius = Math.max(MIN_RADIUS, shadowRadius);
if (isInEditMode()) return;
// Set blur filter to paint
mPaint.setMaskFilter(new BlurMaskFilter(mShadowRadius, BlurMaskFilter.Blur.NORMAL));
resetShadow();
}
public int getShadowColor() {
return mShadowColor;
}
public void setShadowColor(final int shadowColor) {
mShadowColor = shadowColor;
mShadowAlpha = Color.alpha(shadowColor);
resetShadow();
}
public float getShadowDx() {
return mShadowDx;
}
public float getShadowDy() {
return mShadowDy;
}
// Reset shadow layer
private void resetShadow() {
// Detect shadow axis offset
mShadowDx = (float) ((mShadowDistance) * Math.cos(mShadowAngle / 180.0F * Math.PI));
mShadowDy = (float) ((mShadowDistance) * Math.sin(mShadowAngle / 180.0F * Math.PI));
// Set padding for shadow bitmap
final int padding = (int) (mShadowDistance + mShadowRadius);
setPadding(padding, padding, padding, padding);
requestLayout();
}
private int adjustShadowAlpha(final boolean adjust) {
return Color.argb(
adjust ? MAX_ALPHA : mShadowAlpha,
Color.red(mShadowColor),
Color.green(mShadowColor),
Color.blue(mShadowColor)
);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// Set ShadowLayout bounds
mBounds.set(
0, 0, MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.getSize(heightMeasureSpec)
);
}
#Override
public void requestLayout() {
// Redraw shadow
mInvalidateShadow = true;
super.requestLayout();
}
#Override
protected void dispatchDraw(final Canvas canvas) {
// If is not shadowed, skip
if (mIsShadowed) {
// If need to redraw shadow
if (mInvalidateShadow) {
// If bounds is zero
if (mBounds.width() != 0 && mBounds.height() != 0) {
// Reset bitmap to bounds
mBitmap = Bitmap.createBitmap(
mBounds.width(), mBounds.height(), Bitmap.Config.ARGB_8888
);
// Canvas reset
mCanvas.setBitmap(mBitmap);
// We just redraw
mInvalidateShadow = false;
// Main feature of this lib. We create the local copy of all content, so now
// we can draw bitmap as a bottom layer of natural canvas.
// We draw shadow like blur effect on bitmap, cause of setShadowLayer() method of
// paint does`t draw shadow, it draw another copy of bitmap
super.dispatchDraw(mCanvas);
// Get the alpha bounds of bitmap
final Bitmap extractedAlpha = mBitmap.extractAlpha();
// Clear past content content to draw shadow
mCanvas.drawColor(0, PorterDuff.Mode.CLEAR);
// Draw extracted alpha bounds of our local canvas
mPaint.setColor(adjustShadowAlpha(false));
mCanvas.drawBitmap(extractedAlpha, mShadowDx, mShadowDy, mPaint);
// Recycle and clear extracted alpha
extractedAlpha.recycle();
} else {
// Create placeholder bitmap when size is zero and wait until new size coming up
mBitmap = Bitmap.createBitmap(1, 1, Bitmap.Config.RGB_565);
}
}
// Reset alpha to draw child with full alpha
mPaint.setColor(adjustShadowAlpha(true));
// Draw shadow bitmap
if (mCanvas != null && mBitmap != null && !mBitmap.isRecycled())
canvas.drawBitmap(mBitmap, 0.0F, 0.0F, mPaint);
}
// Draw child`s
super.dispatchDraw(canvas);
}
}
use Tag in xml like this:
<yourpackagename.ShadowLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_gravity="center_horizontal"
app:sl_shadow_color="#9e000000"
app:sl_shadow_radius="4dp">
<child views>
</yourpackagename.ShadowLayout>
UPDATE
put the below code in attrs.xml in resource>>values
<declare-styleable name="ShadowLayout">
<attr name="sl_shadowed" format="boolean"/>
<attr name="sl_shadow_distance" format="dimension"/>
<attr name="sl_shadow_angle" format="integer"/>
<attr name="sl_shadow_radius" format="dimension"/>
<attr name="sl_shadow_color" format="color"/>
</declare-styleable>

One possible solution is using nine patch image like this http://developer.android.com/guide/topics/graphics/2d-graphics.html#nine-patch
OR
I have done this in the following way. This is my main layout in which round_corner.xml and drop_shadow.xml used as background resource. round_corner_two is same like round_corner.xml only the color attribute is different. copy the round_corner.xml,drop_shadow.xml and round_conere_two.xml into drawable folder.
<RelativeLayout
android:id="#+id/facebook_id"
android:layout_width="250dp"
android:layout_height="52dp"
android:layout_centerHorizontal="true"
android:layout_marginTop="28dp"
android:background="#drawable/round_corner" >
<LinearLayout
android:id="#+id/shadow_id"
android:layout_width="match_parent"
android:layout_height="48dp"
android:layout_margin="1dp"
android:background="#drawable/drop_shadow" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_marginBottom="2dp"
android:background="#drawable/round_corner_two"
android:gravity="center"
android:text="#string/fb_butn_text"
android:textColor="#color/white" >
</TextView>
</LinearLayout>
</RelativeLayout>
round_corner.xml:
<?xml version="1.0" encoding="utf-8"?>
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<!-- view background color -->
<solid
android:color="#ffffff" >
</solid>
<!-- view border color and width -->
<stroke
android:width="0dp"
android:color="#3b5998" >
</stroke>
<!-- If you want to add some padding -->
<padding
android:left="1dp"
android:top="1dp"
android:right="1dp"
android:bottom="1dp" >
</padding>
<!-- Here is the corner radius -->
<corners
android:radius="10dp" >
</corners>
</shape>
drop_shadow.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item >
<shape
android:shape="rectangle">
<solid android:color="#android:color/darker_gray" />
<corners android:radius="12dp"/>
</shape>
</item>
<item android:right="1dp" android:left="1dp" android:bottom="5dp">
<shape
android:shape="rectangle">
<solid android:color="#android:color/white"/>
<corners android:radius="5dp"/>
</shape>
</item>
</layer-list>

i know this is way too late. but i had the same requirement. i solved like this
<android.support.v7.widget.CardView
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:cardUseCompatPadding="true"
app:cardElevation="4dp"
app:cardCornerRadius="3dp" >
<!-- put whatever you want -->
</android.support.v7.widget.CardView>
you need to add dependency:
compile 'com.android.support:cardview-v7:25.0.1'

set this xml drwable as your background;---
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<!-- Bottom 2dp Shadow -->
<item>
<shape android:shape="rectangle" >
<solid android:color="#d8d8d8" />-->Your shadow color<--
<corners android:radius="15dp" />
</shape>
</item>
<!-- White Top color -->
<item android:bottom="3px" android:left="3px" android:right="3px" android:top="3px">-->here you can customize the shadow size<---
<shape android:shape="rectangle" >
<solid android:color="#FFFFFF" />
<corners android:radius="15dp" />
</shape>
</item>
</layer-list>