ViewPager中带自动缩放小圆点的图片轮播

ViewPager中带自动缩放小圆点的图片轮播

public class FristFragment extends BaseFragment {private RelativeLayout shequ_layout, fankui_layout;private GridView gd_view;private TextView tv_shequ;private ImageView iv_chose;private LinearLayout.LayoutParams params;// 记录小圆点个数的容器private  List<ImageView> dots = new ArrayList<ImageView>();private ViewPager iv_lunbo;//存放图片的数组private List<ImageView> mList;//当前索引位置以及上一个索引位置private static int index = 0, preIndex = 0;//是否需要轮播标志private boolean isContinue = true;//定时器，用于实现轮播private Timer timer = new Timer();private MyHandler mHandler;private LinearLayout ll_dat;private String[] names_grade = new String[]{"生鲜果蔬", "干果干货", "米面粮油", "酒水饮料", "居家日用","外卖送餐"};private int[] ids_grade = new int[]{R.drawable.sxgs,h,ly,R.drawable.jsyl,R.drawable.jjry,R.drawable.wmsc};//图片资源，实际项目需要从网络获取private int[] imageIds = {f_loading,f_loading, f_loading, f_loading};public static final int RESULTCode=1;public FristFragment() {// Required empty public constructor}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {//首页标题栏左右两个布局的点击控件View view=inflater.inflate(R.layout.fragment_frist, container, false);iv_chose= (ImageView) view.findViewById(R.id.iv_chose);fankui_layout= (RelativeLayout) view.findViewById(R.id.fankui_layout);tv_shequ= (TextView) view.findViewById(R.id.tv_shequ);//首页GradViewgd_view= (GridView) view.findViewById(R.id.gd_view);iv_lunbo= (ViewPager) view.findViewById(R.id.iv_lunbo);ll_dat= (LinearLayout) view.findViewById(R.id.ll_dat);shequ_layout= (RelativeLayout) view.findViewById(R.id.shequ_layout);shequ_layout.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent=new Intent(getActivity(),YtfSQChose.class);startActivity(intent);}});fankui_layout.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent=new Intent(getActivity(),PingTaiLiuyanActivity.class);startActivity(intent);}});// Inflate the layout for this fragmentinitGrideView();initData();addListener();//让当前图片位于中间某个位置，目的就是为了开始能够左滑iv_lunbo.setCurrentItem(imageIds.length * 100);initRadioButton(imageIds.length);//注意这句和上面那句顺序不能写反，否则会出现第一个圆点无法显示选中状态startSwitch();return view;}@Overridepublic void onResume() {Resume();tv_shequ.setText( ssage);}/*** 构建GradeView的数据源*/private void initGrideView(){List<Map<String,Object> > list=new ArrayList<>();for (int i = 0; i < names_grade.length; i++) {Map<String,Object> map=new HashMap<>();map.put("name",names_grade[i]);map.put("pig",ids_grade[i]);list.add(map);}String[] from_grade=new String[]{"name","pig"};int[] to_grade=new int[]{R.id.tv_grade_item, R.id.iv_grade_item};SimpleAdapter adapter=new SimpleAdapter(getActivity(),list,ade_chose_layout,from_grade,to_grade);gd_view.setAdapter(adapter);//gradeview点击跳转详情页gd_view.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position, long id) {Intent intent=new Intent(getActivity(), YtfGoodActivity.class);
//                intent.putExtra("url",)startActivity(intent);}});}/*** 初始化数据*/public void initData() {mList = new ArrayList<>();iv_lunbo.setAdapter(pagerAdapter);mHandler = new MyHandler(FristFragment.this);}public class MyHandler extends Handler {private WeakReference<FristFragment> weakReference;public MyHandler(FristFragment fragment) {weakReference = new WeakReference<>(fragment);}@Overridepublic void handleMessage(Message msg) {if (() != null) {index++;iv_lunbo.setCurrentItem(index);}super.handleMessage(msg);}}PagerAdapter pagerAdapter=new PagerAdapter() {@Overridepublic int getCount() {//返回一个比较大的值，目的是为了实现无限轮播return Integer.MAX_VALUE;}@Overridepublic boolean isViewFromObject(View view, Object object) {return view == object;}@Overridepublic Object instantiateItem(ViewGroup container, int position) {position = position % imageIds.length;//因为position非常大，而我们需要的position不能大于图片集合长度//所以在此取余ImageView imageView = new ImageView(getActivity());imageView.setImageResource(imageIds[position]);imageView.setScaleType(ImageView.ScaleType.FIT_XY);container.addView(imageView);mList.add(imageView);return imageView;}@Overridepublic void destroyItem(ViewGroup container, int position, Object object) {}};@Overridepublic void onDestroy() {Destroy();//页面销毁的时候取消定时器if (timer != null) {preIndex = 0;timer.cancel();}}/*** 根据图片个数初始化按钮* @param length 图片所在集合长度*/private void initRadioButton(int length) {for (int i = 0; i < length; i++) {ImageView imageview = new ImageView(getActivity());if(i == 0){imageview.setImageResource(R.drawable.dat_focus);}else {imageview.setImageResource(R.drawable.dat_normal);}//设置滚动小圆点的大小params = new LinearLayout.LayoutParams(10, 10);params.setMargins(15,0,15,0);ll_dat.addView(imageview,params);dots.add(imageview);}}/*** 进行图片轮播*/public void startSwitch() {//执行定时任务timer.schedule(new TimerTask() {@Overridepublic void run() {//首先判断是否需要轮播，是的话我们才发消息if (isContinue) {mHandler.sendEmptyMessage(1);}}}, 3000, 2000);//延迟3秒，每隔2秒发一次消息;}/*** 添加监听*/public void addListener() {iv_lunbo.addOnPageChangeListener(onPageChangeListener);iv_lunbo.setOnTouchListener(onTouchListener);}/*** 根据当前触摸事件判断是否要轮播*/View.OnTouchListener onTouchListener = new View.OnTouchListener() {@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (Action()) {//手指按下和划动的时候停止图片的轮播case MotionEvent.ACTION_DOWN:case MotionEvent.ACTION_MOVE:isContinue = false;break;default:isContinue = true;}return false;//这里只能返回false,如果返回true，Dwon就会消费掉事件，MOVE无法获得事件，// 导致图片无法滑动}};/*** 根据当前选中的页面设置按钮的选中*/ViewPager.OnPageChangeListener onPageChangeListener = new ViewPager.OnPageChangeListener() {@Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}@Overridepublic void onPageSelected(int position) {index = position;//当前位置赋值给索引for (int i = 0; i < dots.size(); i++) {ImageView img = (i);if (i ==(position % dots.size())) {img.setImageResource(R.drawable.dat_focus);LinearLayout.LayoutParams params1=new LinearLayout.LayoutParams(15,15);params1.setMargins(15,0,15,0);img.setLayoutParams(params1);} else {img.setImageResource(R.drawable.dat_normal);params.setMargins(15,0,15,0);img.setLayoutParams(params);}}}@Overridepublic void onPageScrollStateChanged(int state) {}};