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App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
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对于一个项目，应该开发一个与 ESP8266（项目）通信的 Android 应用程序。为了轻松开发应用程序，选择了 MIT App Inventor 2。
项目中可用的 ESP8266 设备的 IP 地址不应固定。应用程序本身应该确定哪些设备当前处于活动状态以及可...
Difference between initLoader and restartLoader in LoaderManager
...e).
While that sounds straight forward it can be tricky (don't we all love Android...).
We have to distinguish between two cases:
Handles configuration changes itself: this is the case for Fragments
that use setRetainInstance(true) or for an Activity with the according android:configChanges tag i...
SQLite table constraint - unique on multiple columns
... that adding UNIQUE(i, j) to the create statement is completely ignored on android. It creates the table, but leaves off the UNIQUE constraint. I was only able to do this by using an index.
– gattsbr
Aug 11 at 14:55
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Is it possible to create a File object from InputStream
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Couldn't resolve IOUtils in Android Studio and the link you referenced is a 404.
– Shahraiz T.
Nov 24 '16 at 5:07
3
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How to prevent custom views from losing state across screen orientation changes
...xtends RecyclerView, you get Parcel﹕ Class not found when unmarshalling: android.support.v7.widget.RecyclerView$SavedState java.lang.ClassNotFoundException: android.support.v7.widget.RecyclerView$SavedState so you need to do the bug fix that's written down here: github.com/ksoichiro/Android-Ob...
Media Queries: How to target desktop, tablet, and mobile?
...-width:320px) { /* smartphones, portrait iPhone, portrait 480x320 phones (Android) */ }
@media (min-width:480px) { /* smartphones, Android phones, landscape iPhone */ }
@media (min-width:600px) { /* portrait tablets, portrait iPad, e-readers (Nook/Kindle), landscape 800x480 phones (Android) */ }
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Accept server's self-signed ssl certificate in Java client
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The [android documentation] (developer.android.com/training/articles/security-ssl#SelfSigned) basically gives your explanation. It just gives a bit more of an explanation, code and warnings.
– Daniel
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Get users by name property using Firebase
... if you want to retrieve the data then do the following:
Using Firebase in Android App:
DatabaseReference ref=FirebaseDatabase.getInstance().getReference().child("users");
ref.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataCha...
Java - sending HTTP parameters via POST method easily
...ot of boilerplate, error prone code. I needed a lightweight wrapper for my Android projects and came out with a library which you can use as well: DavidWebb.
The above example could be written like this:
Webb webb = Webb.create();
webb.post("http://example.com/index.php")
.param("param1", ...
Prevent scrolling of parent element when inner element scroll position reaches top/bottom? [duplicat
...ure for Blink-based platforms too - and that's both Chrome (obviously) and Android WebView (soon).
Quoting the introducing article:
The overscroll-behavior property is a new CSS feature that controls
the behavior of what happens when you over-scroll a container
(including the page itself). You can ...