How to show element gradually

Question

I have an ImageView and I make that element visiable by timer. Its became visable as quick as thought. But I dont know how to make it visiable gradually. For example first it`s transparent then became completely visable. How can i do that?! Here below my timer. How can i update it?!

final ImageView mImageView = (ImageView) findViewById(R.id.mobile);
                mImageView.setVisibility(View.INVISIBLE);
                if (position == 0) {
                    mImageView.postDelayed(new Runnable() {
                        public void run() {
                            if(mImageView!=null) mImageView.setVisibility(View.VISIBLE);
                        }
                    }, 3000);
                }

Answer 1

You can do this with Animation. Create a method such as:

private Animation fadeInAnimation() {
    Animation animation = new AlphaAnimation(0f, 1.0f);
    animation.setDuration(1000); // in milliseconds, change to whatever you want
    animation.setFillEnabled(true);
    animation.setFillAfter(true);
    return animation;
}

And call it when you make the ImageView visible:

mImageView.setVisibility(View.VISIBLE);
mImageView.startAnimation(fadeInAnimation());