مشکل در اجرای انیمشن Activity

اینم کد

 public class ActivitySehTar extends Activity {

    public Button btnS0;

 @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        G.currentActivity = this;
        setContentView(R.layout.main);

        btnS0 = (Button) findViewById(R.id.btnS0);

        OnClickListener btnClickListener = new OnClickListener() {

            @Override
            public void onClick(View view) {
                switch (view.getId()) {
                    case R.id.btnS0:
                        Vibrator();
                        //String btnS1 = btnS01.getText().toString();
                        Intent intent0 = new Intent(G.currentActivity, ActivityMatn.class);
                        intent0.putExtra("USER_INPUT", btnS0.getText().toString());
                        G.currentActivity.startActivity(intent0);
                        G.currentActivity.overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_right);
                        break;
}
            }
        };
          btnS0.setOnClickListener(btnClickListener);
    }
      public void Vibrator() {
        Vibrator vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
        vibrator.vibrate(50);
    }
}