Are the Android APIs open source? If so, I want to see how they implemented the smoothscroll method for the ListView object (this is implemented in API level 8, but I want to build against an earlier API level). How would I go about finding this?
Yes, it's open source, and http://source.android.com/ has all the information on how to download and browse the source.
This is what you want: ListView source code.
Related
From Android studio 2.2 Preview, Google-provided Android code samples based on the currently highlighted symbol in your project. To use the feature, highlight a Variables, Types and Methods in your code then Right Click to show a context menu for Find Sample Code.
[http://android-developers.blogspot.in/2016/05/android-studio-22-preview-new-ui.html][1]
When I tried this future I am getting Samples are currently unavailable for Fragment,AppCompatActivity,Toolbar, FloatingActionButton.
Do we need to download samples or enable it from settings, how can I get this future ?
You need to download samples from the SDK Manager.
Check the following link for reference.
http://www.tutorialspoint.com/android/android_sdk_manager.htm
I seem not to be able to find any of the Google Android samples. For example, I'm reading this: https://developer.android.com/guide/topics/graphics/prop-animation.html#keyframes, and there is a link to a MultiPropertyAnimation sample which should show how to use keyframes. When I click there, it get redirected to a samples main page, and the sample I'm looking for is not there, or at least I can't find it. The same for quit a few other samples. I also tried importing the samples in Android Studio, which provides a search/filtering interface, and can't find anything there.
Has Google moved the samples, and forgotten to update the rest of the docs? Did the 'old' samples get deprecated and moved elsewhere? Can they still be accessed?
The latest (and most convenient way) to do it is:
open android studio
if a project is currently opened, close it (file -> close project)
on the following screen choose "Import an Android code sample".
Also see http://developer.android.com/samples/index.html
I m trying to understand the concept of fragment on android. The official pages has some code snippets and a link mentioning the entire source code called FragementLayout.java. However on clicking it , I get redirected to this page
http://developer.android.com/tools/samples/index.html
Which says the source code is available in the samples directory where the sdk has been installed. I tried checking out samples of various different API levels (8, 11, 17) but could not find the source code for fragments tutorial. Does any body know where it is ?
I have that exact file in the samples folder of 13, 14 & 16.
For extra credit, I recommend checking out the Fragments demo of Action Bar Sherlock, since I believe it shows a better way of learning Fragments.
For more discussion about this, check out my question & the related answers:
How many Activities vs Fragments?
You can see that I do not like the pattern in that tutorial, but there is good discussion for both approaches.
Make a new project using
create project from existing sample. Choose maximum target name then Select Sample ApiDemo.
Finish. Now go to ApiDemos->src->com.example.android.apis.app->FragmentLayout.java
.Enjoy
Yes, it seems to be removed from the official Android online documentation.
However, it can be found in the downloadable "Samples for SDK" for each API level.
To download "Samples for SDK", using "Android 4.4.2 (API 19)" as an example:
Open Android SDK Manager (E.g. Eclipse > Window > Android SDK Manager).
Tick "Android 4.4.2 (API 19)" > "Samples For SDK".
Install.
FragmentLayout.java will be found in a directory like
"C:\Program Files\Android\sdk\samples\android-19\legacy\ApiDemos\src\com\example\android\apis\app\FragmentLayout.java"
You can find the Sample code as well as explanation in official Android Docs
Here
Just clic on this link to download the example from Android Developers wbesite : FragmentBasics.zip
What algorithm is used in Android Gesture recognition?Can I get the source code anywhere?
I will be using android gestures recognition feature and I need to know what are the basic requirements or criteria for Gesture recognition?How does it predict a score against matching gestures?Does it depend on number of gesture strokes?? or the size of gesture strokes?
Try checking the Android Api Source code
Is this what you're looking for? https://android.googlesource.com/platform/frameworks/base/+/master/services/java/com/android/server/accessibility/TouchExplorer.java
You can use IBM Wearables SDK for Android
it allows you to record gestures and then recognise them in your app
for more info:
https://github.com/ibm-wearables-sdk-for-mobile/ibm-wearables-android-sdk
I can't tell you how exactly it works since I haven't tried understanding the code and not sure if I'm capable at my current skill level. But to get the code in androidStudio (don't know if you are using that but maybe it's similar in other software?).
Create a GestureDetector:
private GestureDetector mDetector;
Select the GestureDetector, right click and goto Declaration (CTRL+B).
It takes you to the code. Inside that code you can also select methods and right click go to their declaration.
If it shows you that you don't have the code, I think something pops up to install it. If not you can install it like this:
Tools -> Android -> SDK Manager. In the tab SDK Platforms click on show package details below. Select sources you want to install. You can install sources for multiple versions so you can also check code of older versions if you'd want to.
You can also directly check the files on your computer, the path is something like this for example (if on windows):
C:\Users\yourUserName\AppData\Local\Android\Sdk\sources\android-22\android\view <-here is for example view code for android api level 22
Such as when I use the ArrayAdapter class, I want to know what is be done in the class. Sometimes I want to go the source code to find answer.
So, my question is where can get the source code ?
http://source.android.com/source/index.html
http://grepcode.com/snapshot/repository.grepcode.com/java/ext/com.google.android/android/2.3_r1/
https://android.googlesource.com/platform/frameworks/base/+/froyo-release/core/java/android/widget/ArrayAdapter.java
is the link for ArrayAdapter used in the latest Froyo release from Googles open source repository. You can use the navigation links on that page to get to the other parts of the available source code and other releases of Android.