J'ai réglé le viewpager pour qu'il soit grand au milieu et petit des deux côtés. Cependant, lorsque la première requête réseau est revenue, celle du milieu était aussi grande que celle de droite.
Je l'ai mis dans le sous-thread, mais ça ne marche toujours pas. J'espère que Dieu répondra. . .

public class ImpressCardFragment extends Fragment { @BindView(R.id.vp_pager) ViewPager mPager; private List mList; private Unbinder bind; private List fragmentList; private ImpressCardAdapter cartAdapter; private ACache aCache; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_impress_card, container, false); bind = ButterKnife.bind(this, rootView); transformerPager(); aCache = ACache.get(getContext()); mList = new ArrayList<>(); DisplayMetrics metric = new DisplayMetrics(); getActivity().getWindowManager().getDefaultDisplay().getMetrics(metric); int width = metric.widthPixels; // 屏幕宽度（像素） int height = metric.heightPixels; // 屏幕高度（像素） float density = metric.density; // 屏幕密度（0.75 / 1.0 / 1.5） int densityDpi = metric.densityDpi; mPager.setOffscreenPageLimit(4); mPager.setPageMargin(-width / 4); fragmentList = new ArrayList<>(); cartAdapter = new ImpressCardAdapter(getChildFragmentManager(), getContext(), fragmentList); mPager.setAdapter(cartAdapter); return rootView; } @Override public void onResume() { super.onResume(); //缓存 Impress impress = (Impress) aCache.getAsObject("impressCart"); // if (impress == null) { // getData(); // } else { // // mList.clear(); // mList.addAll(impress.object.get(0).data); // fragmentList.clear(); // for (int i = 0; i < mList.size(); i++) { // fragmentList.add(new PageFragment(mList.get(i))); // } // cartAdapter.notifyDataSetChanged(); // } handler.post(mRunnable); } /** * viewPager的转换效果 */ void transformerPager() { mPager.setPageTransformer(true, new ViewPager.PageTransformer() { public float position; public void transformPage(View page, float position) { this.position = position; if (position < -1) { // This page is way off-screen to the left. } else if (position <= 1) { if (position < 0) { if (position < -0.4f) position = -0.4f; page.setScaleY(1.4f + position); page.setScaleX(1.4f + position); } else { if (position > 0.4) position = 0.4f; page.setScaleY(1.4f - position); page.setScaleX(1.4f - position); } } else { // This page is way off-screen to the right. } } }); } @Override public void onDestroyView() { bind.unbind(); handler.removeCallbacks(mRunnable); super.onDestroyView(); } private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); switch (msg.what) { case 1: Impress body = (Impress) msg.obj; aCache.put("impressCart", body, 2); mList.clear(); mList.addAll(body.object.get(0).data); fragmentList.clear(); for (int i = 0; i < mList.size(); i++) { fragmentList.add(new PageFragment(mList.get(i))); } cartAdapter.notifyDataSetChanged(); break; } } }; private Runnable mRunnable = new Runnable() { @Override public void run() { HttpClient.createRequest(HttpTask.class).impressIndex(String.valueOf(0), String.valueOf(10)).enqueue(new Callback() { @Override public void onResponse(Call call, Response response) { if (response.body().code.equals(Constants.REQUESTID_SUCCESS)) { Impress body = response.body(); Message message = handler.obtainMessage(1); message.obj = body; handler.sendMessage(message); } } @Override public void onFailure(Call call, Throwable t) { Toast.makeText(getContext(), "服务器故障", Toast.LENGTH_SHORT).show(); } }); } }; }