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FloatingActionButton 扩展：悬浮操作按钮扩展，可自定义颜色、大小、位置...
...后更新：2025年6月15日
JDK 版本：11
最低 API 级别：21（Android 5.0）
构建工具：FAST-CLI v3.6.1
兼容性
平台：App Inventor 2、Kodular、Thunkable
最低 Android 版本：Android 5.0 (Lollipop) API 21
测试状态：已在多个平台...
Popup弹出菜单扩展 · App Inventor 2 中文网
...整个屏幕，而且配置视图的选项很少。这里介绍的扩展是Android弹出菜单的包装器。几乎所有属性都是可调的。
默认主题
黑色主题
功能概述
Popup弹出菜单扩展是一...
How to lock orientation during runtime
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This doesn't address the OQ, at least on Android >= 16. setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_NOSENSOR) might set the device to landscape even if it was in portrait, whereas the question refers to locking orientation that was given.
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Getting the class name from a static method in Java
...to use, rather clean and monstrously fast.
Available only since Java 7 and Android API 26!
MethodHandles.lookup().lookupClass();
In case you need this functionality for Android or Java 6, you can use the second best variant. It's rather fast too, but creates an anonymous class in each place o...
Popup弹出菜单扩展 · App Inventor 2 中文网
...整个屏幕，而且配置视图的选项很少。这里介绍的扩展是Android弹出菜单的包装器。几乎所有属性都是可调的。
默认主题
黑色主题
功能概述
Popup弹出菜单扩展是一...
How can I pass a Bitmap object from one activity to another
..., then you get "java.lang.SecurityException: Unable to find app for caller android.app.ApplicationThreadProxy......". the recommended way is like @slayton says, you have to save bitmap on external storage and pass just the URI.
– AITAALI_ABDERRAHMANE
Sep 14 '15...
Can I hide the HTML5 number input’s spin box?
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This currently does nothing on Android, in all browsers. Tested on this test page in Browser 4.2.2, Chrome 28, and Firefox 23 on Android 4.2. Those browsers just show the standard text keyboard with this markup.
– Rory O'Kane
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Convert a string representation of a hex dump to a byte array using Java?
...s you specify
--add-modules java.se.ee (thanks to @eckes)
Not available on Android (thanks to Fabian for noting that), but you can just take the source code if your system lacks javax.xml for some reason. Thanks to @Bert Regelink for extracting the source.
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Java: Date from unix timestamp
...time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.
Android
Later versions of Android bundle implementations of the java.time classes.
For earlier Android (<26), the ThreeTenABP project adapts ThreeTen-Backport (mentioned above). See How to use ThreeTenABP….
The Thre...
How to determine when Fragment becomes visible in ViewPager
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Thanks to today's Android Support Library update (rev 11), the user visible hint issue is finally fixed. It's now safe to use user visible hint for ViewPager.
– Oasis Feng
Nov 14 '12 at 3:05
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