setBackgroundResource calls android.content.res.Resources$NotFoundException

Issue

I have btn_solve_selector.xml file in Drawable folder in order to set Button background programatically.

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true"
      android:color="#ffff0000"/> <!-- pressed -->
<item android:state_focused="true"
      android:color="#ff0000ff"/> <!-- focused -->
<item android:color="#ff0000ff"/> <!-- default -->
</selector>

With above code, I coded below code in onCreate of MyActivity.

    _button1.setBackgroundResource(R.drawable.btn_solve_selector);

But the app was crashed with followed stacktrace.

Caused by: android.content.res.Resources$NotFoundException: File res/drawable/btn_solvenow_selector.xml from drawable resource ID #0x7f020085
....
at com.MyPackage.MyActivity.setMode(MyActivity.java:343)
....
Caused by: org.xmlpull.v1.XmlPullParserException: Binary XML file line #4: <item> tag requires a 'drawable' attribute or child tag defining a drawable
....

It seems like the drawable xml file is failed to read even the file has <item /> inside of it and then fall-back to read android.content.res as a second trial. (I even checked with com.MyPackage.R.drawable.btn_solve_selector instead but failed).

I removed and reinstalled the app but failed. What am I missing?

Solution

use this-

    <selector
    xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_pressed="false">
    <shape>
            <gradient
                android:startColor="#E51400"
                android:endColor="#E51400"
                />
              <stroke
                android:width="3dp"
                android:color="#FFFFFF" />
              <corners
                android:radius="10dp" />

                <padding
                android:left="5dp"
                android:top="4dp"
                android:right="5dp"
                android:bottom="4dp" />

        </shape>
</item>

  <item android:state_pressed="true">
    <shape>
            <gradient
                android:startColor="#4AA038"
                android:endColor="#72C437"
               />

             <stroke
                android:width="3dp"
                android:color="#FFFFFF" />

             <corners
                android:radius="10dp" />
               <padding
                android:left="5dp"
                android:top="4dp"
                android:right="5dp"
                android:bottom="4dp" />

        </shape>
</item>



</selector>

Answered By - Sharad Mhaske