Performance - Lecture 11 - CS50s Mobile App Development
summer2018front/android/app/src/main/assets/index.android
Lost and found management software for lost items or lost property at airport, railway station and any other places. 在学习React Native中的SectionList时 出现了以下警告 ：不影响使用，只是看着很不舒服，于是，查找资料解决：错误：VirtualizedList: missing keys for items, make sure to specify a key property on each item or provide大致意思为：我们使用的SectionList 缺少对子项item的 Save time by searching for lost items Electronics This remote key finder (key tracker)- helps to locate items you often lose. Attach the receiver to your keys, a remote, a purse, glasses, canes, umbrella etc. To use, simply push the colored-buttons on the remote control … Our pick is the Orbit Keys, an aluminum disc that attaches easily to a key ring. It comes in loads of colors, it’s IPX6-certified for water resistance, and it can play an alarm at 90 decibels. Ranking of lost items . If everyone made a list of the top three items that go missing, first place would go to glasses (both sunglasses and prescription glasses).
Sometimes: VirtualizedList: You have a large list that is slow to update - make sure your renderItem function renders components that follow React performance best practices like PureComponent, shouldComponentUpdate, etc. Used to extract a unique key for a given item at the specified index. Key is used for caching and as the react key to track item re-ordering. The default extractor checks item.key, then falls back to using the index, like React does.
android/app/src/main/assets/index.android.bundle
for use with immutable data instead of plain arrays. VirtualizedList Base implementation for the more convenient
android/app/src/main/assets/index.android.bundle
This warning pretty much tells what is about. What is doesn’t tell, is why this is bad and how to fix warning (other than changing the orientation of the nested VirtualizedList but that is not always possible). VirtualizedList # Base implementation for the more convenient
[ReactNative] VirtualizedList: missing keys for items, make sure to specify a key property on each item or provide a custom keyExtractor. Using unique keys with keyExtractor. You can see that FlatList throws this warning: VirtualizedList: missing keys for items, make sure to specify a key property on each item or provide a custom keyExtractor. This simply says that we need to specify a unique key for each item in the list. We can use a custom KeyExtractor for the FlatList as follows:
keyExtractor#. Used to extract a unique key for a given item at the specified index.
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Join the world's largest lost and found community and never lose anything again. Items that may be eligible for return, refund, or exchange include physical goods like a Surface, Xbox controller, virtual reality headset, or packaged software. Digital gift cards and service/subscription cardsmay also be eligible for return (see Microsoft gift card terms and conditions ). When looking for the lost item just press ""FIND"" and a large beeping sound will steer you in the right direction to find the lost item Each tag has a long life battery and a low warning battery feature. Includes tags, batteries, adhesive, key rings.
Key is used for caching and as the react key to track item re-ordering. The default extractor checks item.key, then item.id, and then falls back to using the index, like React does. VirtualizedList: missing keys for items, make sure to specify a key property on each item or provide a custom keyExtractor.
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android/app/src/main/assets/index.android.bundle
displayName; @@ -849,7 +852,7 @@ class VirtualizedList extends React.PureComponent