如何重新加载从线程加载数据的回收视图

Question

在我的安卓应用程序中，我在fragment中有一个recyclerView。因此，recyclerView提供了有关已安装应用程序的详细信息。我正在使用customAdapter并使用线程将数据加载到recyclerView，因为如果不是，UI 就会挂起。我正在使用滑动到重新加载控件。我可以通过重新启动我使用的线程来重新加载回收器视图。但随后recyclerView消失并立即再次出现。

我在这里做错了什么吗？有没有办法避免这种情况。或者有没有更好的方法可以在没有线程或类似东西的情况下做到这一点。这是我的代码。

片段：

Thread loadApps = new Thread() {
            @Override
            public void run() {
                swipeapplist.post(new Runnable() {
                    @Override
                    public void run() {
                        if (!swipeapplist.isRefreshing()) {
                            swipeapplist.setRefreshing(true);
                        }
                    }
                });
                appAdapter = new AppAdapter(context, getInstalledApps());
                final LinearLayoutManager layoutManager = new LinearLayoutManager(context);
                recyclerInstalledApps.post(new Runnable() {
                    @Override
                    public void run() {
                        recyclerInstalledApps.setLayoutManager(layoutManager);
                        LayoutAnimationController controller = AnimationUtils.loadLayoutAnimation(context, R.anim.recycler_layout_animation);
                        recyclerInstalledApps.setLayoutAnimation(controller);
                        recyclerInstalledApps.scheduleLayoutAnimation();
                        recyclerInstalledApps.setAdapter(appAdapter);
                    }
                });
                swipeapplist.post(new Runnable() {
                    @Override
                    public void run() {
                        if (swipeapplist.isRefreshing()) {
                            swipeapplist.setRefreshing(false);
                        }
                    }
                });
            }
        };
        loadApps.start();

获取应用信息的方法

private ArrayList<AppInfo> getInstalledApps() {
    ArrayList<AppInfo> res = new ArrayList<>();
    try {
        if (context != null) {
            pm = context.getPackageManager();
            List<PackageInfo> packs = pm.getInstalledPackages(PackageManager.GET_PERMISSIONS);
            Collections.sort(packs, new Comparator<PackageInfo>() {
                @Override
                public int compare(PackageInfo arg0, PackageInfo arg1) {
                    CharSequence name0 = arg0.applicationInfo.loadLabel(pm);
                    CharSequence name1 = arg1.applicationInfo.loadLabel(pm);
                    return name0.toString().compareTo(name1.toString());
                }
            });
            for (int i = 0; i < packs.size(); i++) {
                PackageInfo p = packs.get(i);
                if ((!isSystemPackage(p))) {
                    String appName = p.applicationInfo.loadLabel(context.getPackageManager()).toString();
                    String packageName = p.applicationInfo.packageName;
                    String appVersion = "Version : " + p.versionName;
                    Drawable icon = p.applicationInfo.loadIcon(context.getPackageManager());
                    res.add(new AppInfo(appName, packageName, appVersion, icon));
                }
            }
        }
    } catch (NullPointerException ex) {
        ex.printStackTrace();
    }
    return res;
}

Answer 1

尝试使用 notifyDataSetChanged

     appAdapter = new AppAdapter(context, getInstalledApps());
            final LinearLayoutManager layoutManager = new LinearLayoutManager(context);
            recyclerInstalledApps.post(new Runnable() {
                @Override
                public void run() {
                    recyclerInstalledApps.setLayoutManager(layoutManager);
                    LayoutAnimationController controller = AnimationUtils.loadLayoutAnimation(context, R.anim.recycler_layout_animation);
                    recyclerInstalledApps.setLayoutAnimation(controller);
                    recyclerInstalledApps.scheduleLayoutAnimation();
                    recyclerInstalledApps.setAdapter(appAdapter);
                }
            });
   appAdapter.notifyDataSetChanged();