Shows how to have smooth transitions when using a navigation drawer

NavigationActivity

private static final int NAVDRAWER_LAUNCH_DELAY = 250;
private static final int CONTENT_FADEIN_DURATION = 250;
private static final int CONTENT_FADEOUT_DURATION = 150;

private boolean mAnimating;

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    mDrawerToggle.syncState();

    mContentFrameLayout.setAlpha(0);
    mContentFrameLayout.animate().alpha(1).setDuration(CONTENT_FADEIN_DURATION).setListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animation) {
            mAnimating = true;
        }

        @Override
        public void onAnimationEnd(Animator animation) {
            mAnimating = false;
        }

        @Override
        public void onAnimationCancel(Animator animation) {
            mAnimating = false;
        }

        @Override
        public void onAnimationRepeat(Animator animation) {
            // no-op
        }
    });
}

@Override
protected void onResume() {
    super.onResume();
    if (!mAnimating) {
        mContentFrameLayout.setAlpha(1);
    }
}

public void goTo(Class<?> cls) {
    mHandler.postDelayed(new Runnable() {
        @Override
        public void run() {
            Intent intent = new Intent(this, cls);
            startActivity(intent);
            overridePendingTransition(0, 0);
        }
    }, NAVDRAWER_LAUNCH_DELAY);
    
    mContentFrameLayout.animate().alpha(0).setDuration(CONTENT_FADEOUT_DURATION);
    
    mDrawerLayout.closeDrawer(Gravity.START);
}