Develop Reference

Is there any view can contain a recyclerview to handle showing or hiding status?

As the title saying , I need a view to hide or show a recyclerview.
Like Spinner.
And I can only show/hide the recyclerview by clicking it.
(It should be a line like Spinner.)
The following image would be more comprehensive.
Is there any way to reach this?

You need to create a custom toggle button with different drawables based on what state the button is in. You have to use a selector like this:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/button_pressed"
android:state_pressed="true" />
<item android:drawable="#drawable/button_focused"
android:state_focused="true" />
<item android:drawable="#drawable/button_default" />
</selector>
See the documentation here: Custom Background
Then you set the visibility on the other view in the onClick event for the button to View.GONE/View.VISIBLE

recylerView.setVisibility(View.GONE);
recylerView.setVisibility(View.VISIBLE);

How to create a state-specific drawable xml for a toggle RadioButton

When creating button drawables, I typically follow the following format to implement an "onClick" change of background:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true" android:state_pressed="true"
android:drawable="#drawable/RESOURCE_FOR_CLICKED" />
<item android:state_focused="false" android:state_pressed="true"
android:drawable="#drawable/RESOURCE_FOR_CLICKED" />
<item android:drawable="#drawable/RESOURCE_NORMAL" />
</selector>
This works fine for me when I am creating traditional buttons as I want them to return to their original state once onClick is finished, and I don't have to implement any code.
However, this does not work for RadioButtons because I actually want their background drawable to be different in the non-pressed state once they have selected.
Are there XML attributes for states involving radio buttons that I should be aware of to implement this sort of thing? If not, do I have to manage the changing of backgrounds in code?

android:state_checked will let you specify a drawable for when a radio item is selected.

How to enable the "pressed" look on LinearLayout

I have the following UI presented when my ListView is empty:
Now, I want that when the user will press this "New Reminder" layout, it'll change to a "highlighted" state (with the blue focus background in ICS and the yellow color in GB)
The layout is clickable and the onClick method is called, but there is no indication for the user while he press his finger down.
I tried setting focusable to true, but it didn't do the trick.
What can I do to give any view the default "pressed" effect?
Thank you!

With your layout, you can set background with drawable like below.
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true" android:drawable="#android:drawable/star_big_on" />
<item android:state_pressed="true" android:drawable="#android:drawable/star_big_on" />
<item android:drawable="#android:drawable/star_big_off" />
</selector>

Draw-able like below
<?xml version="1.0" encoding="UTF-8"?>
<item android:state_enabled="true" android:state_pressed="true" android:drawable="#drawable/left_radio_selected"/>
<item android:state_enabled="false" android:drawable="#drawable/left_radio_inactive"/>
<item android:state_enabled="true" android:state_selected="true" android:drawable="#drawable/left_radio_selected"/>
<item android:drawable="#drawable/left_radio_active"/>
and set your linerlayout.setSelected(true);

I don't know if I understand you correctly. If you want to create pressed state for this layout, you have to prepare state drawable xml (more info). Up there you can set what should your layout looks like while in pressed state.

I'm not sure but your question seems a little vague. From my understanding what you want might be suggested in this post Force a ListView item to stay "pressed" after being clicked?

GridView children don't display focus

In an android app, I have a GridView holding TextView created by an adapter. In those TextView I add an icon which has three states (pressed, selected and default.)
I removed the default selector of the GridView with android:listSelector="#00000000" and I would like the selected state of the icon to display instead. But although the pressed state works (ie when the TextView is pressed, the pressed version of the icons is shown) the seleted doesn't.
I've tried those tricks (found at different places on the web) but it didn't work either:
setting
android:descendantFocusability="afterDescendants"
or
android:drawSelectorOnTop="true"
or (in the TextViews)
android:duplicateParentState="true" />
And if I set the TextView to be focusable, it gets focus independently of the GridView (ie, clicking on it doesn't call the GridView onClick method...)
The icon is defined in a xml file like this:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true"
android:state_pressed="true"
android:drawable="#drawable/ic_flag_bg_pressed"/>
<item android:state_focused="false"
android:state_pressed="true"
android:drawable="#drawable/ic_flag_bg_pressed"/>
<item android:state_focused="true"
android:drawable="#drawable/ic_flag_bg_selected"/>
<item android:state_focused="false"
android:state_pressed="false"
android:drawable="#drawable/ic_flag_bg_default"/>
</selector>
Is there a way to tell the GridView to pass the focused state to its children ?

Got stuck on this as well. An alternate approach that can look okay is to use a border style selector and draw it on top.

how to change button color when it is clicked in android

By default when button is clicked something like orange color will surround the button for short time, that indicates buttons is clicked. But this feature is not working when button contains background image. This is happening in list view too.why ? Any Ideas? TIA
I used setBackgroundColor(Color.BLUE); But here the color is applied and not gone...

You need to use a selector as your background resource :
<?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/button_pressed" />
<item android:state_focused="true" android:drawable="#drawable/button_focus" />
<item android:drawable="#drawable/button_normal" />
</selector>
This selector makes use of 3 separate drawables to change the image of the button , you may use the same image for pressed and focuses.
You need to put this XML into your drawables directory and use it as a background for your button.
For another solution refer : Standard Android Button with a different color

i too had the same problem. so instead of setting the background color,i included three images of button in three different colors , so based on state focused,pressed,default the respective image will replace the other. and it looks like change in the color of the button.
**<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/c2"
android:state_pressed="true" />
<item android:drawable="#drawable/c1"
android:state_focused="true" />
<item android:drawable="#drawable/c1" />
</selector>**
above is the content of the xml file,which must be assigned to the background of the respective button
android:background="#drawable/drawable_button
hope this might be helpful for you