UNICORN

MainActivity.java

package be.benvd.unicorn;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.style.ForegroundColorSpan;
import android.widget.TextView;

public class MainActivity extends Activity {

    private static final int[] COLORS = {0xffff0000, 0xffff7f00, 0xffffff00, 0xff00ff00, 0xff0000ff, 0xff6600ff, 0xff8b00ff};
    private static int iteration = 0;

    private Handler mHandler;
    private Runnable mSetTextRunnable;

    private TextView mTextView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        getActionBar().hide();

        mTextView = (TextView) findViewById(R.id.myText);
        mHandler = new Handler();
        mSetTextRunnable = new Runnable() {
            @Override
            public void run() {
                setText();
            }
        };

        setText();
    }

    private void setText() {
        SpannableStringBuilder builder = new SpannableStringBuilder("UNICORN");
        for (int i = 0; i < COLORS.length; i++) {
            builder.setSpan(new ForegroundColorSpan(COLORS[(iteration + i) % COLORS.length]), i, i + 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
        mTextView.setText(builder);

        iteration = (iteration + 1) % COLORS.length;
        mHandler.postDelayed(mSetTextRunnable, 50);
    }
}

There is some strange behavior when changing orientation multiple times. the frequency of the color changes seem to increase with every orientation change until at one point it seems to stop and the colors remain static.