Monday, 15 August 2016

     In this tutorial we are going to learn about the android button and place a image on that button and give images on every states (pressed,focused and normal).

1) First create a new project in android studio more details...

2) Remove the TextView code from activity_main.xml, create a button in your project by the following code or tools.

<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:background="@drawable/btnhome_new" />


android add button in main_activity.xml

Note:
     In the above image you can see the error @drawable/btnhome_new. Because it will find the file btnhome_new.xml file on drawable directory, but we not yet created.

3) Now we are going to create a file btnhome_new.xml file on drawable directory.
   a) Right click on the drawable directory and => New => Drawable resource file
 
Create new xml file in android

   b) Now a file is opened btnhome_new.xml just remove all the code from that file and replace with the below code.

Note : After create this file the error(@drawable/btnhome_new) is removed from activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/btnblue"
android:state_pressed="true" />
<item android:drawable="@drawable/btnrose"
android:state_focused="true" />
<item android:drawable="@drawable/btnred" />
</selector>

Selector added in a xml file in android.jpeg

You can see some error on this code
@drawable/btnblue
@drawable/btnrose
@drawable/btnred

 Because btnBlue.jpg,btnRose.jpg and btnRed.jpg are not in drawable directory. 4) Now we are going to create all the files in drawable directory.
     Copy the images to drawable directory.

     Paste the copied images to drawable directory.
Paste the copied images to android drawable folder

     A dialog box will ask for confirmation, just press ok.
Paste dialog box in adndroid studio
     Now the images are placed into drawable folder, and you can see the above error was removed.

Successfully removed the error in android

Note : Image name should not contain capital letters.


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