ViewPager 控制tab監聽器 OnPageChangeListener示例

/**

* 頁面變化監聽

* 

* @author wdj 2015年5月14日

*/

private int previousOffset = 0;

public class IndexTabPageChangeListener implements OnPageChangeListener {

@Override

public void onPageScrollStateChanged(int arg0) {

}

@Override

public void onPageScrolled(final int arg0, final float arg1, int arg2) {

int offset = 0;

// 取得該控件的實例

if (currIndex == arg0) {

offset = (int) (currIndex * barText.getWidth() + arg1 * barText.getWidth());

} else if (currIndex > arg0) {

offset = (int) (currIndex * barText.getWidth() - (1 - arg1) * barText.getWidth());

}

                        //爲了保證流暢度，使用動畫類

Animation animation = new TranslateAnimation(previousOffset, offset, 0, 0);

animation.setFillAfter(true);// True:圖片停在動畫結束位置

animation.setDuration(300);

animation.setAnimationListener(new AnimationListener() {

@Override

public void onAnimationStart(Animation animation) {

// TODO Auto-generated method stub

}

@Override

public void onAnimationEnd(Animation animation) {

// 改變tab title的字體顏色

changeLabelColor(arg0);

}

@Override

public void onAnimationRepeat(Animation animation) {

// TODO Auto-generated method stub

}

});

barText.startAnimation(animation);

previousOffset = offset;

}

@Override

public void onPageSelected(final int arg0) {

// // TODO Auto-generated method stub

currIndex = arg0;

changeLabelColor(arg0);

}

}