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On logout, clear Activity history stack, preventing “back” button from opening logged-in-only Activi
...f the history stack so that pressing the "back" button returns the user to Android's home screen.
18 Answers
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Is there a performance difference between a for loop and a for-each loop?
... penalty of allocating the iterator. I had some highly parallel code in an Android live wallpaper. I saw that the garbage collector was going crazy. It was because for-each loops were allocating temporary iterators in many different (short-lived) threads, cause the garbage collector a lot of work. S...
Vertically align an image inside a div with responsive height
... images are appearing out of position, below the container div, on mobile (Android v2.3.5). Any idea on a fix for this?
– user1794295
Aug 30 '13 at 9:32
3
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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...
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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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...
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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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", ...