Android Adapterek

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JSON parsing on Android

innen

1. That comes with platform (org.json) – optimized since 2.2
2. Jackson
3. GSON

...

1. org.json – Not very convenient to use. Doesn’t support stream parsing out of the box.
2. jackson – very convenient to use, excellent mapping features, custom stream deserializers… but don’t use it on Android. Like Facebook and Twitter did… This will put you into the grave:) Everything is excellent before you will take a look into the ddms log.
3. gson – GSON stream is very nice and small. It doesn’t produce so much garbage as Jackson. But it is not so convenient to use. Good news that GSON stream parser is included in API 11.

Android ListView examples

Krysztof Grajek: Custom ListView items and adapters

AppFulcrum:

-Load data from ArrayList

-Using Xml Resource File

-Simple Multiple Selection Checkboxes

-Custom Layout Checkbox, ImageButton, TextView

-Using Sqlite Database

Lars Vogel: Android ListView and ListActivity

2 dologra erdemes odafigyelni a sajat ArrayAdapterunkben. Egyreszt amikor a ListView egy sora lekerul a kijelzorol ezt a view-t megkapja az adapater es a getView(..) method convertView-jaban ujra megapjuk es fel tudjuk hasznalni. Masreszt a getView-ban hivott findViewByID() eleg koltseges ezert erdemes egy ViewHolder class-ban tarolni a findeViewByID() alltal talalt view-kat es ezt a convertView tag-jeben tarolni. Ezzel Lars Vogel szerint kb 175%-os performacianovekedeset erhetunk el. Valahogy igy:

// ViewHolder will buffer the assess to the individual fields of the row layout

static class ViewHolder {

public ImageView imageView;

public TextView textView;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

ViewHolder holder;

if (null == convertView) {

LayoutInflater inflater = context.getLayoutInflater();

rowView = inflater.inflate(R.layout.rowlayout, null, true);

holder = new ViewHolder();

holder.textView = (TextView) rowView.findViewById(R.id.label);

holder.imageView = (ImageView) rowView.findViewById(R.id.icon);

rowView.setTag(holder);

} else {

holder = (ViewHolder) rowView.getTag();

}

holder.textView.setText("whatever text");

holder.imageView.setImageResource(R.drawable.testicon);

return convertView;

}

Android es Eclipse tutorialok

Android

Eclipse

dp to pixel (Android)

private int dpToPixel(float dp) {

int result;

final float scale = getResources().getDisplayMetrics().density;

result = (int) (dp * scale + 0.5f);

return result;

}

Supporting Multiple Screens

Emulator-ban fut-e az Android code

Csak ezt talaltam:

if ("sdk".equals(Build.PRODUCT)) {...}

Android Location

LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

Location loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);

if (null != loc) {

Double longitude = loc.getLongitude();

Double latitude = loc.getLatitude();

}

A manifiest-be pedig:

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />

Ez az utolso csak akkor kell, ha LocationManager.GPS_PROVIDER helyett valami mock location provider-t akarunk hasznalni. Ezt meg valahogy igy tehejuk meg:

String MOCK_LOC_PROVIDER_NAME = "mockLocationProvider";

...

lm.addTestProvider(MOCK_LOC_PROVIDER_NAME, false, false, false, false, false, false, false, 0, 5);

Location location = new Location(MOCK_LOC_PROVIDER_NAME);

location.setLatitude(32.23434);

location.setLongitude(-16.32525);

location.setTime(new Date().getTime());

lm.setTestProviderLocation(MOCK_LOC_PROVIDER_NAME, location);

lm.setTestProviderEnabled(MOCK_LOC_PROVIDER_NAME, true);

Es igy nezhetjuk meg, hogy mar hozzaadtuk-e a sajat location provider-unket (2-szer ugyanazt nem lehet hozzaadni mert akkor hiba lesz):

List providers = lm.getAllProviders();

if (providers.contains(MOCK_LOC_PROVIDER_NAME)) {...}

tab valtas Eclipse-ben

Ctrl + Page Up

Ctrl + Page Down

mobileorchard: Andorid Menus

1. Options Menu

2. Context Menus

3. Alternative Menus

AndEngine

This is the official WiKi for AndEngine -- the free 2D OpenGL Game Engine for the Android platform.

Readonly sdcard AVD-hez

Letrehoztam Eclipse-ben egy AVD-t (Android Virtual Device), de az sdcard-ja readonly volt. Probalkoztam mindenfelevel, de vegul az segitett, ha csinaltam egy uj AVD-t. Nem tudom mit rontottam el elsore, de ez a masodik mar nem volt read only. Itt viszont eloszor tul kicsi-t csinaltam (128 MB) amire nem tudtam felmasolni egy 7 MB-os mp4-et. Amikor csinaltam egy masik AVD-t 1024 MB-os sdcard-dal, akkor arra mar felment ez a file. (Viszont maga az AVD sokkal lassabban keszult el, mert sokaig tartott letrehozni az sdcard.img-t. Raadasul az AVD indulasanal is lassabban tolti be az sdcard-ot, ezert egy ideig itt is readonly-nak tunik.)

Android: Loading and playing videos from different sources

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android design patterns

Itt.

shourtcut a hianyzo package importalashoz Eclipse-ben

Ctrl-Shift-O

Cmd-Shift-O (Mac)

An Introduction to QuickTime

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Neil Mackenzie: Examples of the Windows Azure Storage Services REST API

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Hidden file-ok mutatasa OS X dialog box-okban

Command+Shift+pont (innen)

Jan Sorgalla: Riding carousels with jQuery

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Chris Coyier: CSS font size

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jQuery Tools Scrollable

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Tom Nelson: Before You Before You Buy Mac Memory – Mac Memory Buying Advice

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Ross Shannon: CSS and Spacing

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css - fix szelessegu kozpeso oszlop es fluid szelsok

Itt van egy megoldas. (Eredetileg innen.)

forgatas Silverlight-ban

Az volt a feladat, hogy egy videot kellett 90 fokkal elforgatva megjeleniteni Silverlight-ban.

Erre van a PlaneProjection (msdn) ami 3D-ben tud forgatni, de nekunk eleg volt a RotationZ.

Tovabbi peldak:

• Silverlight 3 Tutorial - PlaneProjection and Perspective 3D (Switch On The Code)
• MJ Ferdous: Silverlight 3.0-Perspective 3D Animation
  

Bill Foust: Creating your First BlackBerry Project

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David Mendez: Start, Stop, and Restart Windows Services from Mac OS X

Innen.

Mac OS X includes Samba support by default, and this is really handy if you’d like to remotely restart and monitor services running on a Windows machine.

To list services running on the Windows machine, use this command:
net rpc service list -I IPADDRESS -U USERNAME%PASSWORD
A practical example would be:
net rpc service list -I 192.168.0.115 -U Windows%myPassword

After identifying the service you want to restart, you issue the following command to stop the service:
net rpc service stop SERVICENAME -I IPADDRESS -U USERNAME%PASSWORD

Then you can restart (or start) the service by using the following command:
net rpc service start SERVICENAME -I IPADDRESS -U USERNAME%PASSWORD

This is tip that I found on Lifehacker that was aimed at Linux users, but considering Mac OS X has a unix underbelly equipped with samba the command works just the same on a Mac.

BlackBerry Documentation

http://docs.blackberry.com/en/

Learn About HTML5 and the Future of the Web video

Itt van.

readerQuotas

Itt kell beallitani, hogy mekkora tombok mehetnek fel-le.

maxArrayLength:

A positive integer that specifies the maximum allowed array length of data being received by Windows Communication Foundation (WCF) from a client. The default is 16384.

maxBytesPerRead:

A positive integer that specifies the maximum allowed bytes returned per read. The default is 4096.

Es a web.config-ban ide kell tenni:

configuration\system.ServiceModel\bindings\customBinding\binding\binaryMessageEncoding\readerQuotas

Victor Gaudioso Silverlight videok

Itt vannak osszegyujtve.