Amokrane Chentir Amokrane

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Senior Engineer at Spotify.

Amokrane / worker_notifs.rb

Created April 9, 2012 10:20

Worker code for notifs

	require 'iron_worker'

	class C2dmIronWorker < IronWorker::Base
	attr_accessor :auth_token
	attr_accessor :c2dms
	attr_accessor :params

	def run
	uri = URI.parse('https://android.clients.google.com/c2dm/send')

Amokrane / iron_worker_c2dms.rb

Created April 9, 2012 09:24

Using Iron.IO for pushing notifications

	require 'iron_worker'

	class NotifsPusher
	def perform
	begin
	puts "Initializing IronWorker and pushing billions of C2dm into it..."
	IronWorker.configure do \|config\|
	config.token = ENV['IRON_WORKER_TOKEN']
	config.project_id = ENV['IRON_WORKER_PROJECT_ID']
	end

Amokrane / custom_internal_mem_android_emulator.sh

Created February 24, 2012 10:01

Start an Android emulator with custom internal memory

emulator-arm.exe -partition-size 123 -avd myandroid4

Amokrane / ab_testing.java

Created February 3, 2012 13:04

AB Testing on Android

	private static final boolean isA = UUID.randomUUID().getLeastSignificantBits() % 2 == 0;

	@Override
	public void onCreate(...) {
	super.onCreate(saved...);

	if(!isA) {
	setContentView(R.layout.mainA);
	MyApp.getInstance().tracker().trackPageView("/AUser");
	} else {

Amokrane / parallel_pattern.java

Created February 3, 2012 12:57

The parallel activity pattern

	private static boolean shinyNewAPIS = android.os.Build.VERSION_SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB;

	@Override
	public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);

	Intent startActivityIntent = null;

	if(!shinyNewAPIS) {
	startActivityIntent = new Intent(this, legacyActivity.class);

Amokrane / allocation_tracking.java

Created January 31, 2012 22:15

Allocation Tracking

	// Limit allocations to find problems
	int prevLimit = -1;

	try {
	prevLimit = Debug.setAllocationLimit(0);
	// Do stuff
	} finally {
	Debug.setAllocationLimit(-1);
	}

Amokrane / hit_and_run.java

Created January 30, 2012 23:22

Pattern for writing animations

	view.setLayerType(View.LAYER_TYPE_HARDWARE, null);
	ObjectAnimator animator = ObjectAnimator.ofFloat(view, "rotationY", 180);

	animator.addListener(new AnimatorListenerAdapter() {
	@Override
	public void onAnimationEnd(Animator animation) {
	view.setLayerType(View.LAYER_TYPE_NONE, null);
	}
	});

Amokrane / decode_bitmap.java

Created January 30, 2012 22:51

Clever way to decode a bitmap

	// Allocate a bitmap of the desired size
	Bitmap b = Bitmap.createBitmap(256, 256, BitmaP.Config.ARGB_8888);

	// Set the allocated bitmap as the target
	BitmapFactory.Options opts = new BitmapFactory.Options();
	opts.inBitmap = b;

	// Decode resource in pre-allocated bitmap
	BitmapFactory.decodeResource(resources, R.drawable.texture, opts);

Amokrane / copyView.java

Created January 26, 2012 12:52

Copy a view into a Bitmap (useful for taking screenshots)

	int spec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNDEFINED);
	view.measure(spec, spec);
	view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
	Bitmap b = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
	Canvas c = new Canvas(b);
	c.translate(-view.getScrollX(), -view.getScrollY());
	view.draw(c);

	// OR
	view.setDrawingCacheEnabled(true);

Amokrane / draw_canvas.java

Created January 26, 2012 12:51

Load a (mutable) bitmap into a Canvas and write text over it

	Paint p = new Paint();
	p.setAntiAlias(true);
	p.setTextSize(24);

	Bitmap b = Bitmap.createBitmap(256, 256, Bitmap.Config.ARGB_8888);
	Canvas c = new Canvas(b);
	c.drawText("Devoxx", 0.0f, 128.0f, p);