Android实现viewpager实现循环轮播效果

/**
* viewpager切换页面时动画
*/
public class MainActivity extends AppCompatActivity {
private ViewPager viewPager;
private ViewPaagerAdapter adapter;
private ArrayList<View  viewlist=new ArrayList< ();//承载图片
private ArrayList<TextView  tvList=new ArrayList< ();//底部圆点集合
private int []imgList={R.drawable.img8,R.drawable.img1,R.drawable.img2,R.drawable.img3,R.drawable.img4,R.drawable.img5,
R.drawable.img6, R.drawable.img7,R.drawable.img8,R.drawable.img1};//图片数组
boolean isStop=false;
private LinearLayout line;//小圆圈父视图
private ScheduledThreadPoolExecutor executor;
private int currentPage;
private Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case 1:
viewPager.setCurrentItem(msg.arg1);
break;
default:
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
viewPager= (ViewPager) findViewById(mybanner_viewpager);
line= (LinearLayout) findViewById(R.id.line);
setView();//设置轮播显示的底图
adapter=new ViewPaagerAdapter(this,viewlist);
viewPager.setAdapter(adapter);
viewPager.setCurrentItem(1);
viewPager.setOffscreenPageLimit(10);//加这个是为了防止第一张往左滑动会出现闪烁
startService();//启动轮播
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(final int position, float positionOffset, int positionOffsetPixels) {
Log.i("tag","位置"+position+"positionOffset"+positionOffset+"positionOffsetPixels"+positionOffsetPixels);
Log.i("tag","weizhi"+viewPager.getCurrentItem());
if (position==imgList.length-1) {
viewPager.setCurrentItem(1,false);
}else if(viewPager.getCurrentItem()==0&& positionOffsetPixels==0) {
viewPager.setCurrentItem(imgList.length-2, false);
}
currentPage=viewPager.getCurrentItem();
}
@Override
public void onPageSelected(final int position) {
Log.i("tag","位置wwwww"+position);
setEnbale();
if (position==imgList.length-1) {
tvList.get(0).setEnabled(true);
}
else if (position==0) {
tvList.get(imgList.length-3).setEnabled(true);
}
else{
tvList.get(position-1).setEnabled(true);
}
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
public void setView() {
LinearLayout.LayoutParams params=new LinearLayout.LayoutParams(15,15);
params.leftMargin=10;
params.rightMargin=10;
for (int i = 0; i < imgList.length; i++) {
View view= LayoutInflater.from(this).inflate(R.layout.layout,null,false);
ImageView img= (ImageView) view.findViewById(R.id.img);
img.setBackgroundResource(imgList[i]);
TextView textView= (TextView) view.findViewById(R.id.tv);
textView.setText(i+"");
viewlist.add(view);
}
for (int i = 0; i < imgList.length-2; i++) {
TextView view=new TextView(this);
view.setBackgroundResource(R.drawable.item);
view.setLayoutParams(params);
view.setEnabled(false);
line.addView(view);
tvList.add(view);
}
tvList.get(0).setEnabled(true);
}
public void setEnbale(){
for (TextView tvcycle: tvList) {
tvcycle.setEnabled(false);
}
}
/**
* 启动线程池开启循环任务
*/
public void startService(){
executor=new ScheduledThreadPoolExecutor(1);
executor.scheduleWithFixedDelay(runnable,1,2, TimeUnit.SECONDS);
}
/**
* 停止任务
*/
public void stopService(){
executor.shutdown();
}
Runnable runnable=new Runnable() {
@Override
public void run() {
currentPage=currentPage+1%10;
Message message= Message.obtain();
message.what=1;
message.arg1=currentPage;
handler.sendMessage(message);
}
};
@Override
protected void onDestroy() {
super.onDestroy();
stopService();
}
}

if (position==imgList.length-1) {
viewPager.setCurrentItem(1,false);
}else if(viewPager.getCurrentItem()==0&& positionOffsetPixels==0) {
viewPager.setCurrentItem(imgList.length-2, false);
}