CODEWITHSUNDEEP
javaandroidandroid-layoutandroid-canvasandroid-view
learner
learner

Reputation: 11790

animate/flash circle drawn with android canvas

I have a custom view. I override the onDraw method to draw a filled circle, among other things. I want the circle to flash between red and blue, the interval can be 100 milliseconds. How would I accomplish such animation? So far I have

    @Override
protected void onDraw(Canvas canvas) {
    this.mFilledPaint.setColor(Color.BLUE);
    canvas.drawCircle(x, y, radius, mFilledPaint);
}

Upvotes: 1

Views: 2498

Answers (1)

Triode
Triode

Reputation: 11357

int color = Color.BLUE;
postDelayed(new Runnable() {
    @Override
    public void run() {
        color = (color == Color.BLUE) ? Color.Black : Color.BLUE;
        invalidate();
        postDelayed(this, 100);
    }
}, 100);

@Override
protected void onDraw(Canvas canvas) {
    this.mFilledPaint.setColor(color);
    canvas.drawCircle(x, y, radius, mFilledPaint);
}

Call the post delayed in the constructor or nay other function you feel relevant.

Upvotes: 2

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