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App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 - App Invent...
...备被扫描后直接连接即可通信。蓝牙App开发示例demo参考界面如下：
扫描蓝牙设备，代码如下：
扫描完成后，设备列表展示到“列表显示框”组件中：
点击列表中的目标设备（一般硬件文档会有说明，名称会有特别的标识）...
How to detect UI thread on Android?
...e a robust way to detect if Thread.currentThread() is the Android system UI thread in an application?
I would like to put some asserts in my model code that asserts that only one thread ( eg the ui thread) accesses my state, to assure that no kind of synchronization is necessary.
...
Task continuation on UI thread
...inuation with TaskScheduler.FromCurrentSynchronizationContext():
Task UITask= task.ContinueWith(() =>
{
this.TextBlock1.Text = "Complete";
}, TaskScheduler.FromCurrentSynchronizationContext());
This is suitable only if the current execution context is on the UI thread.
...
Set Page title using UI-Router
I am migrating my AngularJS based app to use ui-router instead of the built in routing. I have it configured as shown below
...
Hand Coded GUI Versus Qt Designer GUI [closed]
... what do people writing real world applications in Qt use to design their GUIs? In fact, how do people design GUIs in general?
...
How to pass an object into a state using UI-router?
...e to be able to transition to a state and a pass an arbitrary object using ui-router.
6 Answers
...
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare();
...is code in the thread where you want to send a Toast message:
parent.runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(parent.getBaseContext(), "Hello", Toast.LENGTH_LONG).show();
}
});
Keep a link to the parent Activity in the background thread that created this t...
The application may be doing too much work on its main thread
...
taken from : Android UI : Fixing skipped frames
Anyone who begins developing android application sees this message on
logcat “Choreographer(abc): Skipped xx frames! The application may be
doing too much work on its main thread.” So wh...
控件重绘函数/消息OnPaint,OnDraw,OnDrawItem,DrawItem的区别 - C/C++ - 清...
...色，背景颜色，画刷类型，字体等等，但不能改变元素的界面框架，这是DrawItem 所能干的。如果同时有DrawItem（子类），OnDrawItem（宿主类），OnCtlColor（宿主类），它们的调用顺序是：
OnCtlColor，OnDrawItem，DrawItem。
如果我们同时...
Why I am Getting Error 'Channel is unrecoverably broken and will be disposed!'
...
Have you used another UI thread? You shouldn't use more than 1 UI thread and make it look like a sandwich. Doing this will cause memory leaks.
I have solved a similar issue 2 days ago...
To keep things short: The main thread can have many UI thr...