Develop Reference

How can we remove default Android Device colour

I am going on with the scroll action in my Android Device if i scroll any thing in the device after it reaches the end point in top and bottom if even we scroll it shows some colours for different device eg:(samsung it shows blue light).
Here i attached a screenshot below:
How can we remove it or if no chance can we change the color
Usually we will use ScrollView,Listview etc to scroll the view should go on with XML or progrmatically.
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:fillViewport="true"
android:overScrollMode="never"
android:scrollingCache="false"
android:fadingEdge="none" >
TRIED
android:cacheColorHint="#00000000"
android:scrollingCache="false"
list.setCacheColorHint(Color.TRANSPARENT);
android:fadingEdge="none"
listView.setVerticalFadingEdgeEnabled(false);
android:overScrollMode="never"
But no change can any one help me to fix this issue.

this effect is named overscroll
listView.setOverscrollFooter(new ColorDrawable(Color.RED));
listView.setOverscrollHeader(new ColorDrawable(Color.RED));
be awared that some devices ignores this params, example here

I don't know how to completely disable the overflow in the ScrollView, but I have come across a library that you can use so as to change your overflow color.
LINK:https://github.com/AndroidAlliance/EdgeEffectOverride

Here is the solution which helped me to solve
Custom overscroll glow/edge color for ListView?
for the user Menny
referred link:http://evendanan.net/android/branding/2013/12/09/branding-edge-effect/
Hope this help's you

Adding bottom margin to ListView last element

I need to add to add ListView with complicated items background: different for even/odd and rounded corners at the top and bottom. It looks like this:
I have implemented all this stuff via level-list, but there is one more thing I want to do.
Now the bottom item is near the bottom of the screen. It is better to add some space.
I don't want to add bottom margin to ListView, I need margin only for last item.
The ways I see to do this:
Footer
A kind of hack – add footer with empty TextView to ListView. But footers are quite unstable things, they usually disappear after notifyDataSetChanged and there is no way to get them back
Image with transparent pixels
I asked designer to add transparent pixels to bottom background resource. Unfortunately, in this case vertical centering is completely broken.
For example, there is 9patch like this:
And layout like this:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<!-- View with background with transparent pixels on bottom -->
<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content"
android:id="#+id/item"
android:background="#drawable/some_bgr"
android:padding="10dp"
>
<TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1"
android:text="Title"
android:layout_gravity="center"
android:textSize="18sp"
/>
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content"
android:text="Detail"
android:layout_gravity="center"
android:textSize="18sp"
/>
</LinearLayout>
<!-- Just for marking place took by view -->
<FrameLayout android:layout_width="match_parent" android:layout_height="match_parent"
android:layout_below="#id/item"
android:background="#88ff55"
/>
</RelativeLayout>
The result:
As you see, centering is not working. Unfortunately.
(BTW, if specify this 9patch as background for TextView, centering works good. If you know any article, explaining this, please let me know.)
Add bottom margin to last item in Adapter implementation
That should work, but for unknown reason I still can't get it work.
I don't like this way, because I don't like to modify dimensions in code.
So
There is already imaginary way – construct some XML drawable with particular bitmap and margin. According to drawables concept it should be possible, but I can't find implementation. May be somebody knows?
Any other ideas?

In your ListView, set a paddingBottom and clipToPadding="false".
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="8dp"
android:clipToPadding="false"
android:scrollbarStyle="outsideOverlay"/>
This also works for RecyclerView.
Only use android:scrollbarStyle="outsideOverlay" if you want the scroll bar to not overflow into the padded area.

add an empty footer in your list like this:
TextView empty = new TextView(this);
empty.setHeight(150);
listview.addFooterView(empty);

you can also do it from code if you want, for example here I react to
to EditText different situations:
if(s.toString().length()>0)
{
contacts_lv.setClipToPadding(false);
contacts_lv.setPadding(0,0,0,270*screenDensity);
}
else
{
contacts_lv.setClipToPadding(true);
contacts_lv.setPadding(0,0,0,0);
}

Clocksmith's answer is the best and pretty clever. You can also create an empty footer view.

Add these two lines in your listView XML code:
android:transcriptMode="alwaysScroll"
android:stackFromBottom="true"

Another solution might be that you make a mock view with certain height.
In your adapter in getViewCount return 2.
In getCount return yourData.size+1.
In getViewType check if the element is last element return 2;
Use this type in getView to populate the mockview.

I guess you want to add margin only to last item:
So you can do in this manner, in your getview method the index of the list item and check if its the last item, then progrmatically add margin to the view.

Changing the color of over scroll in scrollview in android

I have a small problem with my scroll view. Whenever a scroll view has over scrolled, it shows a yellow gradient (in my device, it may vary for other devices) at edges of scroll view. It can be eliminated by setting attribute as below in android 2.3 and above.
android:overScrollMode="never"
Now i want to change the default color to some other. How to achieve this.
Please help me regarding this. Any help will be appreciated.

You should use the following attributes on your ListView :
<ListView
...
android:overScrollHeader="#drawable/header"
android:overScrollFooter="#drawable/footer"/>
You could also set them programatically using setOverscrollFooter(Drawable d) and setOverscrollHeader(Drawable d).

This EdgeEffectOverride library works nicely for all scroll-type views: https://github.com/AndroidAlliance/EdgeEffectOverride
E.g.
<uk.co.androidalliance.edgeeffectoverride.EdgeEffectScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
...
app:edgeeffect_color="#color/red"
/>
And
EdgeEffectScrollView gridView = (EdgeEffectScrollView) root.findViewById(R.id.myscroll);
gridView.setEdgeEffectColor(Color.RED);

Using layout_gravity="bottom" to place at bottom of LinearLayout

I would like to place a layout on the bottom of a LinearLayout, but I can't seem to get it to work. I know that I can use RelativeLayout to do this, but I should be able to use LinearLayout, shouldn't I?
EDIT: Actually this is more confusing than I thought. The layout below is simplified. In reality, I'm using fragments on a pre-3.0 device, with the compatibility layer.
I used Hierarchy Viewer to examine what's going on, and found that an android.support.v4.app.NoSaveStateFrameLayout was added to my layout, and that layout has layout_height set to wrap_content. That seems to be what's causing my problem, but I haven't yet figured out how to fix it.
Specifically, why doesn't this work? Shouldn't the layout_gravity place it at the bottom?
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
... stuff here ...
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:orientation="horizontal">
... more stuff here ...
</LinearLayout>
</LinearLayout>
BTW, changing layout_height to fill_parent or setting layout_weight don't seem to work either. I just want to better understand what is going on, because clearly I'm missing something important. Thanks.

First of all nice question.
Android behaves we can say weird in the situation like this.
if you have selected your parent linear layout's orientation horizontal then you can set its child component at bottom by setting its layoug_gravity=bottom. suppose you have added 2 text views in that horizontal linear layout and second textview's layout_gravity is bottom then it will set to bottom but it work like it is set at bottom in other column then the first text view. NOTE : you can set textview's layout_gravity = "left" or "right" when its parent linearlayout is horizontal but you cant see its result.
Oppositely, if you have selected parent linearlayout's orientation vertical then you can set its child component at left or right by using layout_gravity. but the second textview will shown in you can say next row with left or right gravity as you have set. NOTE you can set textview's layout_gravity = "top" or "bottom" when its linear layout is vertical but you can not see its result.
Try to make sample xml design as i have stated above so you get better idea.
Strange but True!!! Try to understand this behavior. :)

Just add space between what you want at the bottom and all the rest:
<Space
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"/>

So I resolved the problem. It's a two-part solution:
First, the way to do this without using LinearLayout is to provide weight to the element above so that it takes up all of the empty space. BTW, you can see this example in the API demos: http://developer.android.com/resources/samples/ApiDemos/res/layout/linear_layout_3.html
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
... stuff here ...
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:weight="1"/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
... more stuff here ...
</LinearLayout>
</LinearLayout>
This by itself didn't solve my problem, as I had a NoSaveStateFrameLayout with layout_width="wrap_content" as a parent view, and so I needed to get that fixed first. I'm using code based on the wonderful Google I/O App, and when I searched the code for NoSaveStateFrameLayout, I found this:
// For some reason, if we omit this, NoSaveStateFrameLayout thinks we are
// FILL_PARENT / WRAP_CONTENT, making the progress bar stick to the top of the activity.
mRootView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.FILL_PARENT));
Thanks for an awesome comment Google!!! I added this into my source and everything worked great!
The moral of the story: Hierarchy Viewer and comments are your friends.

LinearLayout will just stack things as they are placed in there. Since it is vertical, it will keep placing items one after the next in a vertical manner. Can you change the android:gravity of the linearLayout and not the layout_gravity of the nested one and see if that works.
RelativeLayout of course should be the first way but you stated you didnt want to do that. Is there reason for that?

It could be that, as per https://stackoverflow.com/a/13366783/513038, you need to set the parent LinearLayout to have android:baselineAligned="false". Worked in my case.

Hiding ListView Header / Hiding Single Divider in a List

I found this Hide footer view in ListView?. As Yoni poited out correctly, you can hide a header in a ListView by wrapping it into a FrameLayout and setVisibility() of the inner View to View.GONE. This works almost perfect for me, BUT:
As the FrameLayout still exists, the ListView adds two dividers to the displayed list. It seems like a single divider with a height of two dividers. Is there a way to hide a single divider of a ListView? Maybe it's possible to change the divider's color to the background, that would be fine for me, too. Any complete other ideas? Perfect!
Please help me. I'm not keen on spending two more hours of trial and error.
Thanks a lot!

Together with hiding or showing your header or footer, use these functions:
setFooterDividersEnabled()
setHeaderDividersEnabled()

you can use xml attributes to hide divider for header and footer in ListView
android:footerDividersEnabled="false"
android:headerDividersEnabled="false"

you can change the dividers color like this:
<ListView
android:id="#+id/android:list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:divider="#android:color/transparent"
android:dividerHeight="2px"/>

For disable divider:
ListView.setDivider(null);