Android把定时轮番放到ViewPager里面

import java.util.Timer;
import java.util.TimerTask;

import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;

public class CustomViewPager extends ViewPager{

private int viewPagerIndex = 0;
private boolean viewPagerTaskIsRunning = false;

private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case -1:
CustomViewPager.this.setCurrentItem((Integer) msg.obj);
break;

default:
break;
}
}
};

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

@Override
public void setOnPageChangeListener(final OnPageChangeListener listener) {

super.setOnPageChangeListener(new OnPageChangeListener() {

@Override
public void onPageSelected(int arg0) {
viewPagerIndex = arg0;
listener.onPageSelected(arg0);
}

@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
listener.onPageScrolled(arg0, arg1, arg2);
}

@Override
public void onPageScrollStateChanged(int arg0) {
if (arg0 == 0 && !viewPagerTaskIsRunning) {
runViewpagerTask();
}else if (arg0 == 1 && viewPagerTaskIsRunning) {
viewPagerTaskIsRunning = false;
timer.cancel();
}
listener.onPageScrollStateChanged(arg0);
}
});
}

private Timer timer = null;
/**
* 执行viewpager定时任务
*/
private void runViewpagerTask() {
viewPagerTaskIsRunning = true;
timer = new Timer();
TimerTask task = new TimerTask() {
@Override
public void run() {
viewPagerIndex++;
Message msg = new Message();
msg.what = -1;
if (viewPagerIndex >= getAdapter().getCount()){
viewPagerIndex = 0;
}
msg.obj = viewPagerIndex;
handler.sendMessage(msg);
}
};
timer.schedule(task, 6000, 6000);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}