Question

I have a countdown timer that onFinished I want to have the screen change colors repeatedly.

I’m trying:

public void onFinish() {
findViewById(R.id.screenid).setTag("BLACK");
_timer2=new Timer();
_timer2.scheduleAtFixedRate(Flashscreen, 0,1700);}



TimerTask Flashscreen = new TimerTask()
{
    public void run() {

        if ( findViewById(R.id.screenid).getTag()=="BLACK" )
        {
            findViewById(R.id.screenid).setBackgroundColor(Color.BLUE);
            findViewById(R.id.screenid).setTag("BLUE");
            return;
        }
        if (findViewById(R.id.screenid).getTag()=="BLUE")
        {
            findViewById(R.id.screenid).setBackgroundColor(Color.BLACK);
            findViewById(R.id.screenid).setTag("BLACK");
            return;

        }
                }};

But it will only change the color to blue once. What’s happening wrong?

Answer 1

Can you try putting both changing of color to run on uithread.
Something like below

runOnUiThread(new Runnable() {
    @Override  
    public void run() {
        findViewById(R.id.imageView1).setBackgroundColor(Color.BLACK);
        findViewById(R.id.imageView1).setTag("BLACK");
    }
});