隐藏程序图标想要修改两处：

1.在首次加载时隐藏特定应用图标。

找到LoaderTask.java类，里面有个loadAllApps方法。

boolean quietMode = mUserManagerState.isUserQuiet(user);
// Create the ApplicationInfos
for (int i = 0; i < apps.size(); i++) {
    LauncherActivityInfo app = apps.get(i);
    // This builds the icon bitmaps.
    mBgAllAppsList.add(new AppInfo(app, user, quietMode), app);
}

可以在这个for循环内过滤应用图标。（自己实现checkPackageName方法去判断是否需要显示图标）

boolean quietMode = mUserManagerState.isUserQuiet(user);
// Create the ApplicationInfos
for (int i = 0; i < apps.size(); i++) {
    LauncherActivityInfo app = apps.get(i);
    AppInfo appInfo = new AppInfo(app, user, quietMode);
    if (checkPackageName(appInfo.componentName.getPackageName())){
         mBgAllAppsList.add(appInfo,app);
    }
    // This builds the icon bitmaps.
    //mBgAllAppsList.add(appInfo, app);
}

2.在页面刷新时隐藏应用图标。

找到PackageUpdatedTask.java，找到execute方法的OP_UPDATE条件。

case OP_UPDATE:
                try (SafeCloseable t =
                             appsList.trackRemoves(a -> removedComponents.add(a.componentName))) {
                    for (int i = 0; i < N; i++) {
                        if (DEBUG) Log.d(TAG, "mAllAppsList.updatePackage " + packages[i]);
                        if(checkPackageName(packages[i])){
   iconCache.updateIconsForPkg(packages[i], mUser);
                        appsList.updatePackage(context, packages[i], mUser);
                        app.getWidgetCache().removePackage(packages[i], mUser);
                        }
                    }
                }
                // Since package was just updated, the target must be available now.
                flagOp = FlagOp.removeFlag(WorkspaceItemInfo.FLAG_DISABLED_NOT_AVAILABLE);
                break;

自己实现checkPackageName方法。