How to make text fade in and out in Android?

Question

I have a paragraph of text and when a button is clicked I want that text to fade out, change to some other text, then fade back in. I have some code but it doesn\'t do the fade

Answer 1

When I have an amount of texts to FadeIn / FadeOut , I prefere use a function to do this:

protected void onCreate(Bundle savedInstanceState) {
{
...
//Declare the array of texts:
String aSentences[]={"Sentence 1", "Sentence 2", "Sentence 3"};
TextView tView = (TextView)findViewById(R.id.Name_TextView_Object);

//call the function:
animateText(tView,aSentences,0,false);
}

private void animateText(final TextView textView, final String texts[], final int textIndex, final boolean forever) {
        //textView <-- The View which displays the texts
        //texts[] <-- Holds R references to the texts to display
        //textIndex <-- index of the first text to show in texts[]
        //forever <-- If equals true then after the last text it starts all over again with the first text resulting in an infinite loop. You have been warned.

        int fadeInDuration = 1000; // Configure time values here
        int timeBetween = 5000;
        int fadeOutDuration = 2000;

        textView.setVisibility(View.INVISIBLE);    //Visible or invisible by default - this will apply when the animation ends
        textView.setText(Html.fromHtml(texts[textIndex]));

        Animation fadeIn = new AlphaAnimation(0, 1);
        fadeIn.setInterpolator(new DecelerateInterpolator()); // add this
        fadeIn.setDuration(fadeInDuration);

        Animation fadeOut = new AlphaAnimation(1, 0);
        fadeOut.setInterpolator(new AccelerateInterpolator()); // and this
        fadeOut.setStartOffset(fadeInDuration + timeBetween);
        fadeOut.setDuration(fadeOutDuration);

        AnimationSet animation = new AnimationSet(false); // change to false
        animation.addAnimation(fadeIn);
        if((texts.length-1) != textIndex) animation.addAnimation(fadeOut);
        animation.setRepeatCount(1);
        textView.setAnimation(animation);

        animation.setAnimationListener(new Animation.AnimationListener() {
            public void onAnimationEnd(Animation animation) {
                if (texts.length -1 > textIndex) {
                    animateText(textView, texts, textIndex + 1,forever); //Calls itself until it gets to the end of the array
                }
                else {
                    textView.setVisibility(View.VISIBLE);
                    if (forever == true){
                        animateText(textView, texts, 0,forever);  //Calls itself to start the animation all over again in a loop if forever = true
                    }
                    else
                        {//do something when the end is reached}
                }
            }
            public void onAnimationRepeat(Animation animation) {
                // TODO Auto-generated method stub
            }
            public void onAnimationStart(Animation animation) {
                // TODO Auto-generated method stub
            }
        });
    }