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App Inventor 2 SQLite 拓展 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
SQLite 拓展此SQLite 拓展由中文网开发及维护，仅对会员免费开放。与 TaifunSQLite 功能类似，但TaifunSQLite是收费的，美刀。
文档及拓展下载地址：https://www.fun123.cn/reference/extensions/sqlite.html
系统界面增强扩展 - KevinkunEnhance - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
...整布局外观(感谢ldtxinkai提供截图)
属性块设置背景颜色及圆角背景颜色fillColor、边框宽度borderWidth、边框颜色borderColor、圆角半径roundRadius。"圆角半径可以是一个数字（同时设置四个角），或者是四个数字用逗号隔开（顺时...
How to put space character into a string name in XML?
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Android doesn't support keeping the spaces at the end of the string in String.xml file so if you want space after string you need to use this unicode in between the words.
\u0020
It is a unicode space character.
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How to read/write a boolean when implementing the Parcelable interface?
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@sotrh that is a copy-paste from a source code. Open android.os.Parcel source and see for yourself.
– Yaroslav Mytkalyk
Jan 5 '16 at 10:19
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Should accessing SharedPreferences be done off the UI Thread?
...ched), but yaffs doesn't have much in the way of concurrency (and a lot of Android devices run on yaffs... Droid, Nexus One, etc.) so if you avoid disk, you avoid getting stuck behind other in-flight or pending disk operations.
so you'll probably want to load the SharedPreferences during your onCrea...
How to obtain the start time and end time of a day?
...ted to Java 6 & 7 in the ThreeTen-Backport project, further adapted to Android in the ThreeTenABP project.
An Instant is a moment on the timeline in UTC with a resolution of nanoseconds.
Instant instant = Instant.now();
Apply a time zone to get the wall-clock time for some locality.
ZoneId zone...
Programmatically go back to the previous fragment in the backstack
...opBackStack() methods (there are several to choose from)
http://developer.android.com/reference/android/app/FragmentManager.html#popBackStack()
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Can't find @Nullable inside javax.annotation.*
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In case someone has this while trying to compile an Android project, there is an alternative Nullable implementation in android.support.annotation.Nullable. So take care which package you've referenced in your imports.
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Calling a Fragment method from a parent Activity
I see in the Android Fragments Dev Guide that an "activity can call methods in a fragment by acquiring a reference to the Fragment from FragmentManager, using findFragmentById() or findFragmentByTag() ."
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How to hide a View programmatically?
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Or view.setVisibility(View.INVISIBLE) if you just want to hide it.
From Android Docs:
INVISIBLE
This view is invisible, but it still takes up space for layout purposes. Use with setVisibility(int) and android:visibility.
GONE
This view is invisible, and it doesn't take any spac...