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Android “Only the original thread that created a view hierarchy can touch its views.”
I've built a simple music player in Android. The view for each song contains a SeekBar, implemented like this:
27 Answers
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android fragment- How to save states of views in a fragment when another fragment is pushed on top o
In android, a fragment (say FragA ) gets added to the backstack and another fragment (say FragB ) comes to the top. Now on hitting back FragA comes to the top and the onCreateView() is called. Now I had FragA in a particular state before FragB got pushed on top of it.
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使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...块并将其拖放到基于 Web 浏览器的平台上即可创建自己的 Android 移动应用程序 [2]。 这种简单易用的编程界面支持超过 450 万用户，使每个人（即使是没有任何编程经验的人）都能够快速创建自己的移动应用程序。 与传统的Android...
Android dismiss keyboard
...ed like a champ for me, the getWindow().setSoftInputMode method did not on android 4.0.3 HTC Amaze.
@Ethan Allen, I did not need to make the edit text final. Maybe you are using an EditText inner class that you declared the containing method? You could make the EditText a class variable of the ...
Difference between Service, Async Task & Thread?
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Also notable is that by default Android services run on the main (UI) thread. If your service needs to do work in the background, it needs to be launched in a separate thread (or AsyncTask) explicitly. Otherwise it can risk interrupting the UI responsiven...
Detect Safari using jQuery
...of window.InstallTrigger !== 'undefined';
var is_safari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
Usage:
if (is_safari) alert('Safari');
Or for Safari only, use this :
if ( /^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {alert('Its Safari');}
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What is the native keyword in Java for?
... with _1 in the C function name as mentioned at: Invoking JNI functions in Android package name containing underscore
Interpretation
native allows you to:
call a compiled dynamically loaded library (here written in C) with arbitrary assembly code from Java
and get results back into Java
This ...
Android basics: running code in the UI thread
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As of Android P you can use getMainExecutor():
getMainExecutor().execute(new Runnable() {
@Override public void run() {
// Code will run on the main thread
}
});
From the Android developer docs:
Return an Executor th...
How to pass data from 2nd activity to 1st activity when pressed back? - android
...turn result to onActivityResult()
Fetching Result from a called activity - Android Tutorial for Beginners
These articles will help you understand how to pass data between two activities in Android.
SharedPreferences.onSharedPreferenceChangeListener not being called consistently
...d that fixes the problem, not the unregistering in onDestroy.
UPDATE: The Android docs have been updated with warnings about this behavior. So, oddball behavior remains. But now it's documented.
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