Develop Reference

How to make dynamic background gradient in scrollView android

I want layout with dynamic background gradient. Start scroll from one color and at the end of scroll another color. If this screen without scroll, background looks like usual gradient.
Is there are any way to do it?
Thank a lot.

I'm not sure if this is what you mean.You can create a xml file in drawable and name it like background.xml. In this file, for example:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="false">
<shape android:shape = "rectangle>
<gradient
android:startColor="#`enter code here`"
android:endColor="#`enter code here`"
android:angle="..." />
</shape>
</item>
</selector>
Then in the layout of your activity, you set background by #drawable/background.xml

Adding a border to an AlertDialog

I am trying to add a border to an alert dialog. I am hoping to make it look like this:
The best solution I have found thus far is to use a nine patch drawable as the background for the dialog.
The problem with this is that I have not found a way to make a nine patch background that actually gives the dialog a consistent white line around it. This has been my best attempt thus far (sorry it is a little hard to see...) :
The problem is that this produces a dialog like this:
The problems here are twofold; the lines at the sides are way too thick, and the lines at the top are kind of faded by the shadow.
My only ideas are to either find a working nine patch that gives a consistently thick border, or to find a way to get the 'main layout' of the alert dialog, so I can add a padding to that directly.
What is the best way to go about setting up a border on an Alert Dialog like this?

The answer by questioner was very close to what I wanted, but it still left a big black line around the dialog that I was not interested in.
I deleted one of the layers from the layer list, and customised the padding on the white border. I also did not set the background to transparent as suggested would be a good idea in the comments.
The shape the is inside the item is to give the background the same curved edges on a dialog (if you look really closely on 3.0+, you can see a few pixels of round corners).
In a dialog_border.xml file in the drawable folder, I had this:
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:top="6dp"
android:left="13dp"
android:right="13dp"
android:bottom="6dp">
<shape android:shape="rectangle" >
<solid android:color="#color/offWhite" />
<corners
android:radius="3dp"/>
</shape>
</item>
</layer-list>
And in my style I had this:
<style name="DialogTheme" parent="android:Theme.Holo.Dialog">
<item name="android:windowBackground">#drawable/dialog_border</item>
</style>
Although it could probably be set programatically rather than in the style if necessary.

In your dialog's xml set following background for top level view:
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#color/white"/>
<item
android:bottom="1dp"
android:drawable="#color/black"
android:left="1dp"
android:right="2dp"
android:top="2dp">
</item>
</layer-list>
You can customise border width on each side.

Changing Android SeekBar to draw secondary progress on top of primary progress?

I would like to change the behavior of an android seekbar so that the secondary android seekbar is actually drawn on top of the primary android seekbar. From the ProgressBar documentation listed here:
http://developer.android.com/reference/android/widget/ProgressBar.html#attr_android:secondaryProgress
This progress is drawn between the primary progress and the
background.
Current look of secondary Progress bar:
Desired look of secondary progress bar:
Ideally I'd like to override a method in ProgressBar.java in Android to change the order of drawing so that the secondary progress bar is drawn on top of the primary progress bar, but I've had difficulty finding the proper area in the source code to override. Any ideas where to look?
I have had success attempting to draw two progress bars one on top of another using a relative layout, but this approach requires creating two controls.

This is a late answer, but just I found out how to do this. Not that difficult :)
First of all look at how the progress drawable is defined in the android project [here].(https://github.com/android/platform_frameworks_base/blob/master/core/res/res/drawable/progress_horizontal_holo_dark.xml)
All you have to do is switch the order of secondaryProgress and progress so that progress comes before (lies below) secondaryProgress like this:
<item android:id="#android:id/background"
android:drawable="#android:drawable/progress_bg_holo_dark" />
<item android:id="#android:id/progress">
<scale android:scaleWidth="100%"
android:drawable="#android:drawable/progress_primary_holo_dark" />
</item>
<item android:id="#android:id/secondaryProgress">
<scale android:scaleWidth="100%"
android:drawable="#android:drawable/progress_secondary_holo_dark" />
</item>
Now sadly those resources are not public. So you will have to copy progress_bg_holo_dark.9.png, progress_primary_holo_dark.9.png and progress_secondary_holo_dark.9.png to your projects drawable-xhdpi folder (and maybe to the same with other dpi images as well).
Then adjust the xml file like the following (just remove "android:"):
<item android:id="#android:id/background"
android:drawable="#drawable/progress_bg_holo_dark" />
<item android:id="#android:id/progress">
<scale android:scaleWidth="100%"
android:drawable="#drawable/progress_primary_holo_dark" />
</item>
<item android:id="#android:id/secondaryProgress">
<scale android:scaleWidth="100%"
android:drawable="#drawable/progress_secondary_holo_dark" />
</item>

Android ImageButton background color

I have an ImageButton with a background image that has some transparency. By default, the button gets a grey background where the transparency pixels are - due to the Holo.Light theme. I tried setting the background color of the button to transparent via the setBackgroundColor(Color.TRANSPARENT) method. That works just fine and does what I need except now my button no longer has the light blue color when focused/pressed and looks rather flat (no borders around it, so it looks like an image).
I googled and saw that you can assign selectors as explained here but that would mean that I have to specify an image per button state and I don't want to do that. I want to inherit the focuses/pressed colors from the theme but overwrite the normal button background (when not pressed/focused) to transparent instead of grey. How can I achieve that?? Please provide a working example as I have tried many different combinations with no success.
Edit
Thank you all for helping. I figured out how to make this work without having to recreate the same image with the focused and pressed states for each button!
Here is my solution:
My button is defined as:
<ImageButton
android:id="#+id/ImageButton05"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="#drawable/button" />
And my background XML file (titled button.xml) is defined as follows:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<layer-list>
<item android:drawable="#drawable/btn_default_pressed_holo_light"></item>
<item android:drawable="#drawable/network_wifi"></item>
</layer-list>
</item>
<item android:state_focused="true">
<layer-list>
<item android:drawable="#drawable/btn_default_focused_holo_light"></item>
<item android:drawable="#drawable/network_wifi"></item>
</layer-list>
</item>
<item android:state_hovered="true">
<layer-list>
<item android:drawable="#drawable/btn_default_focused_holo_light"></item>
<item android:drawable="#drawable/network_wifi"></item>
</layer-list>
</item>
<item>
<layer-list>
<item android:drawable="#drawable/btn_default_normal_holo_light"></item>
<item android:drawable="#drawable/network_wifi"></item>
</layer-list>
</item>
</selector>

You can put something into an xml file, for example, custom_button.xml and then set background="#drawable/custom_button" in the button view.
Please refer to this link as there is an xml example: Standard Android Button with a different color
I used it in my code and it worked just the way I wanted.
Reference:
Standard Android Button with a different color
Edited:
If you would rather use
Maybe you should try to set a border.
For example (Reference: Android - border for button ):
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient android:startColor="#FFFFFF"
android:endColor="#00FF00"
android:angle="270" />
<corners android:radius="3dp" />
<stroke android:width="5px" android:color="#000000" />
</shape>
OR,
You could try to set the style/theme for the button. (But it would be in a separate file)
The style/theme contains the color attributes for various states of button such as focused / enabled / disabled/ etc.
For setting background color/image and having click highlight effect,
Here is an example (Reference: How to programmatically setting style attribute in a view)
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_pressed="true"
android:drawable="#drawable/btn_pressed" />
<item
android:state_pressed="false"
android:drawable="#drawable/btn_normal" />
</selector>
You can then apply this selector to a Button by setting the property android:background="#drawable/my_button".

I want to inherit the focuses/pressed colors from the theme but overwrite the normal button background (when not pressed/focused) to transparent instead of grey. How can I achieve that??
AFAIK you can't because the focus/pressed colors are built in to the same image resources that contain the grey background.
If you want to keep the system focus/pressed but remove the background you'll have to grab a copy of the image resources (which can be found in your SDK at /sdkroot/platforms/[version]/data/res/drawable-hdpi replace [version] with whatever api level you are after. And if needbe replace hdpi with another density) and edit out the grey button from them with a photo editor. Then make a selector that references your modified images and set that as the background for your button.
EDIT:
Here are the default holo button images for focused and pressed

You can use ImageView instead of ImageButton to solve your problem. Please set the android:background property of the ImageView to the background color of the parent.

You can write this in your xml file:
android:background="#null"
It worked for me.

if u don't need the default gray background and u need your ImageButton seems like an icon without no backgrounds just use android:background attribute and set it to
#android:color/transparent**
<ImageButton
android:id="#+id/ImageButton05"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="#android:color/transparent"
android:background="#drawable/button" />
hope that help anybody

seekbar progress customization

Using progress_horizontal.xml as a base drawable for my seekbar i was able to customize it pretty well. But unfortunately i stuck with the following problem. I need my progress to be made from two horizontal lines with different color something like this http://picasaweb.google.com/manigoad/Other#5442553107070487330 . In this case a blue line and transparent line below it.
So how can i make my progress to be made from two different colors.
Tnaks

I've had a look into creating the "stack" of shapes that you are looking for using "drawable" XML, but the padding/height values seem to be ignored.
There are two possible workarounds that I can think of:
Create a class that implements Drawable for the background and the progress and draw the custom colours/gradients yourself.
-OR-
Create a PNG of the background (on the right) and progress (on the left) from your mockups. About 30px wide should be fine (if you make them 1px wide, it will be put more pressure on the layout because it has to be repeated more times). Throw those in res/drawable/ and then load them into your styles using <bitmap>:
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="#android:id/background">
<bitmap android:src="#drawable/scroll_bg" />
</item>
<item android:id="#android:id/progress">
<clip>
<bitmap android:src="#drawable/scroll_progress" />
</clip>
</item>
</layer-list>