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App Inventor 2 BLE扩展源码分析 - WriteBytes vs WriteStrings 23字节硬编...
...可协商的：BLE 4.2+ 支持协商更大的 MTU（最大512字节）
2. Android BLE 栈自动处理分片：gatt.writeCharacteristic() 会根据协商后的 MTU 自动分片
3. 硬编码过时了：这个值是 BLE 4.0 的最小 MTU，现代设备普遍支持更大的 MTU
4. 正确做法：应...
How to set time zone of a java.util.Date?
...ime functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.
Android
Later versions of Android (26+) bundle implementations of the java.time classes.
For earlier Android (<26), a process known as API desugaring brings a subset of the java.time functionality not originally built int...
How to copy files from 'assets' folder to sdcard?
...d you have to give the permission on the manifest e.g. <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
– IronBlossom
Jun 18 '12 at 6:25
22
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notifyDataSetChanged example
I'm trying to use in my Android Application the notifyDataSetChanged() method for an ArrayAdapter but it doesn't work for me.
...
How to set a Fragment tag by code?
...] in the post on stackoverflow [1]: stackoverflow.com/questions/9363072/android-set-fragment-id
– SME
Jul 26 '12 at 6:04
2
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“aapt” IOException error=2, No such file or directory" why can't I build my gradle on jenkins?
...e following similar error on Ubuntu 13.10:
Cannot run program "/usr/local/android-sdk-linux/build-tools/19.0.3/aapt": error=2, No such file or directory
And this answer fixed it for me:
To get aapt working (this fixed my issues with the avd as well) just install these two packages:
sudo apt-g...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
...ment, asynchronously.
SQLite原文档
SQLite 是 Android 内置的小型、快速、独立的 SQL（结构化查询语言）数据库引擎。
SQL 语句用于创建、选择、更新和删除一个或多个表中的数据。SQL 允许表之间建立复杂的关系，并提...
PendingIntent does not send Intent extras
...
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How to convert currentTimeMillis to a date in Java?
...f the functionality is backported to Java 6 & 7 and further adapted to Android. Made by the some of the same folks as had made Joda-Time.
An Instant is a moment on the timeline in UTC with a resolution of nanoseconds. Its epoch is first moment of 1970 in UTC.
Assuming your input data is a coun...
Static nested class in Java, why?
...e of static nested class.
Example for such kind of usage, you can find in Android R.java (resources) file.
Res folder of android contains layouts (containing screen designs), drawable folder (containing images used for project), values folder (which contains string constants), etc..
Sine all the f...