TextView循環改變字體大小的跑馬燈

使用自定義的TextView去循環改變字體的大小：

源碼：

import android.content.Context;
import android.graphics.Color;
import android.os.Handler;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.style.AbsoluteSizeSpan;
import android.util.AttributeSet;
import android.widget.TextView;

/**
 * @author: [email protected]
 * @Description：仿造iphone鎖屏時,滑動時提示字體的跑馬燈效果
 * @version: 1.0
 */
public class MyTextView extends TextView {

	private Handler handler = new Handler();

	private int len; // 字體長度
	private int index = -4; // -4代表高亮前會暫停一小會...

	public MyTextView(Context context) {
		super(context);
		init();
	}

	public MyTextView(Context context, AttributeSet attrs) {
		super(context, attrs);
		init();
	}

	private void init() {
		handler.postDelayed(runnable, 300);
	}

	/**
	 * @Description 顏色跑馬燈效果
	 */
	int getColor(int i) {
		int a = 0;
		if (i == 1 || i == 5) {
			a = 0x58;
		} else if (i == 2 || i == 4) {
			a = 0xa8;
		} else if (i == 3) {
			a = 0xff;
		}
		return Color.argb(a, 0xff, 0xff, 0xff);
	}

	/**
	 * @Description 字體大小跑馬燈效果
	 **/
	void setSpanTextSize(SpannableString spannable, int startindex, int endindex) {
		spannable.setSpan(new AbsoluteSizeSpan(20, true), startindex, endindex,
				Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
	}

	Runnable runnable = new Runnable() {
		@Override
		public void run() {
			if (index == len) {
				index = -1;
			}
			String text = MyTextView.this.getText().toString();
			len = text.length();
			SpannableString spannable = new SpannableString(text);
			if (index >= 0 && index < len - 0) {
				setSpanTextSize(spannable, index + 0, index + 1);
			}
			if (index >= -1 && index < len - 1) {
				setSpanTextSize(spannable, index + 1, index + 2);
			}
			if (index >= -2 && index < len - 2) {
				setSpanTextSize(spannable, index + 2, index + 3);
			}
			if (index >= -3 && index < len - 3) {
				setSpanTextSize(spannable, index + 3, index + 4);
			}
			if (index >= -4 && index < len - 4) {
				setSpanTextSize(spannable, index + 4, index + 5);
			}
			MyTextView.this.setText(spannable);
			index++;
			handler.postDelayed(this, 100);
		}
	};
}

源碼地址：http://download.csdn.net/detail/u013985004/7686137