Animation has no effect when switching between activities [android help]

Animation has no effect when switching between activities

I would like to switch the activities using animation.. I have a view with 5 images and with that i set my oncliclk listener. My main activity is

private View.OnClickListener onClickListener = new View.OnClickListener()
      {
        public void onClick(View testView)
        {
          if (testView == Main.this.myinput)
          {   
         Intent i = new Intent(Main.this, Activity1.class);
        startActivity(i);
        overridePendingTransition(R.anim.fade_in, R.anim.fade_out); 
          }

       if (testView == Main.this.myinput)
          {   
         Intent i = new Intent(Main.this, Activity2.class);
        startActivity(i);
        overridePendingTransition(R.anim.fade_in, R.anim.fade_out); 
          }
        }
      };

and my animation files are fade_in:

           android:interpolator="@android:anim/accelerate_interpolator"
           android:fromAlpha="0.0" 
           android:toAlpha="1.0"
           android:duration="500" />

fade_out:

           android:interpolator="@android:anim/accelerate_interpolator"
           android:fromAlpha="1.0" android:toAlpha="0.0"
           android:fillAfter="true"
           android:duration="500" />

Now my problem is when switching between activities, animation has no effects... I referred to satck overflow and googled but couldn't find why animation is not working.. I tried this with various type of animations such as slide_in_left,right,top,bottom... but animation is not working. Help me in resolving this issue.Thanks in advance..

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