Android Button color changing on onClick?

buttoncolor.xml

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

Now use like below:

b1 = (Button) findViewById(R.id.b1);
b1.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View arg0) {
         b2.setBackgroundDrawable(getResources().getDrawable(R.drawable.whatever));
    }
});

b2 = (Button) findViewById(R.id.b2);
b2.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View arg0) {
         b1.setBackgroundDrawable(getResources().getDrawable(R.drawable.whatever));
    }
});

Try this:

final Button buttonA = (Button) findViewById(R.id.ButtonA);
final Button buttonB = (Button) findViewById(R.id.ButtonB);

buttonA.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
buttonB.setBackgroundColor(Color.CYAN);
}
});

buttonB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
buttonA.setBackgroundColor(Color.RED);
}
});

or

make selector.xml in drawables folder and copy code below in it:

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

copy this code for buttonA in your layout

<Button
    android:id="@+id/buttonA"
    style="@drawable/test"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_alignParentTop="true"
    android:text="Button A" />

Use below code..

Boolean isOnePressed = false, isSecondPlace = false;
b1.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                isOnePressed = true;
                b1.setBackgroundColor(Color.BLUE);
                if (isSecondPlace) {
                    b2.setBackgroundColor(Color.WHITE);
                    isSecondPlace = false;
                }

            }
        });
        b2.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                b2.setBackgroundColor(Color.BLUE);
                isSecondPlace = true;
                if (isOnePressed) {
                    b1.setBackgroundColor(Color.WHITE);
                    isOnePressed = false;
                }

            }
        });

Hope it helps...