Simple Android Dev's Blog

New EyeSavior PRO is here!

2012-11-27T16:30:00.000+02:00

Hi all!
Finally, my EyeSavior PRO is here on Google Play. It was a long way, but we did it!
No ADs!
No limits!
Full support!

Game development on Android, part 2: Porting from iPhone Cocos2D

2012-05-04T15:13:00.001+03:00

If you're going to port game from iPhone Cocos2D - here is a good link from a man, who did it! http://www.cocos2d-iphone.org/forum/topic/21210

Game development on Android, part 1: Game Loop

2012-05-04T15:11:00.001+03:00

I've found pretty good article for gamedev starters: http://www.koonsolo.com/news/dewitters-gameloop/

Here you can read about good paractices about game loop development.

Your Accountant - Version 1.0 released

2012-03-06T12:28:00.000+02:00

Do You need all your spendings noted and categorized? Do You spend a lot of time calculating money? Want to know where do You spend all the money? Our Accountant was created for You! This little helper will keep in memory all the spendings and make statistics.
- Note all the spendings
- Sort them by groups
- Accounts support
- Create a templates to save time on creating new records
- Create notifications in system calendar
- Simple and smart user interface

Android Design

2012-01-13T11:44:00.001+02:00

Good news everybody! Google has opened new resource for us to help in designing Android applications. It's Android Design. I recommend you to read it carefully and make more and more great-looking apps! :)

Отличный обзор новых устройств Sony на Android с CES-2012

2012-01-11T17:49:00.000+02:00

Вот обзор Android-устройств Sony от mobile-review.com c CES 2012, хотеть-хотеть :)

Asynchronous ListView image and data loading in Android

2011-12-20T12:12:00.001+02:00

Hi! Today I'm going to tell you how to load data in ListView items asynchronous in Android.
First. For example we'll build a list of images, that we download from the Internet.
Second. ListView item is the simple LinearLayout with ImageView.

Third. Our adapter code:

public class ImageListAdapter extends BaseAdapter {
 
 private List itemsUrls;
 private Context ctx;
 
 public FeedListAdapter(Context ctx) {
  this.ctx = ctx;
 }
 
 private class ViewHolder {
  public ImageView image;
  
 }

 @Override
 public int getCount() {
  return itemsUrls.size();
 }

 @Override
 public Status getItem(int pos) {
  return itemsUrls.get(pos);
 }

 @Override
 public long getItemId(int pos) {
  return pos;
 }

 @Override
 public View getView(int pos, View convertView, ViewGroup parent) {
  View v = convertView;
  if(v == null){
   LayoutInflater vi = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
   v = vi.inflate(R.layout.status_item, null);
   ViewHolder holder = new ViewHolder();
   holder.image = (ImageView) v.findViewById(R.id.image);
   v.setTag(holder);
  }
  ViewHolder holder = (ViewHolder)v.getTag();
  //Setting the image url as a tag for the image view
  holder.image.setTag(items.get(pos));
  holder.image.setImageDrawable(null);
  //starting async task for image loading
  new ImageTask().execute(holder);
  return v;
 }
 
 private class ImageTask extends AsyncTask {
  
  private ImageView avatarImage;
  private Bitmap av = null;
  private String url;
  
  @Override
  protected void onPostExecute(Boolean result) {
   super.onPostExecute(result);
   if(result && av != null) {
    if(avatarImage.getTag().toString().equals(url)) {
     avatarImage.setImageBitmap(av);
    }
   }
  }

  @Override
  protected Boolean doInBackground(ViewHolder... params) {
   ViewHolder item = (ViewHolder) params[0];
   boolean result = false;
   if(item != null) {
    try {
     avatarImage = item.image;
     url = item.image.getTag().toString();
     av = getBitmapMethod(url);
     result = true;
    } catch (Exception e) {
     e.printStackTrace();
    }
   }
   return result;
  }
  
 }
}

Here it is, now we have the async image loading as in different twitter clients.

Your Accountant application

2011-11-10T20:18:00.001+02:00

Hi! It was a long time since I posted here. So, last four days I was working on my first appliication for Android Market, called "Your Accountant" ("Карманный Бухгалтер" in Russian).
It's very simple, but this is only the beginning :)
In future I will work on it and develop further.
Charts, accounts, design and more to come.
Now, check it out

Android OpenGL ES 1.0: How to load non-power of 2 bitmaps

2011-10-31T16:37:00.000+02:00

Hi all.
Today I will show my code for loading non-power of 2 bitmaps for textures.
Quite simple.

loadTexture():

   int imageWidth = mBitmap.getWidth();
   int imageHeight = mBitmap.getHeight();
   
   int height = imageHeight;
   int width = imageWidth;
   
   boolean convert = false;
   
   if(!MathUtils.isPowerOfTwo(height)) {
    height = MathUtils.nextPowerOfTwo(height);
    convert = true;
   }
   
   if(!MathUtils.isPowerOfTwo(width)) {
    width = MathUtils.nextPowerOfTwo(width);
    convert = true;
   }
   
   float maxS = imageWidth / (float)width;
   float maxT = imageHeight / (float)height;
   
   setTextureCoordinates(new float[]{ 0f, maxT,
       maxS, maxT,
                0f, 0f,
                maxS, 0f });
   
   ByteBuffer data = ByteBuffer.allocateDirect(width * height * 4);
   data.order(ByteOrder.nativeOrder());
   
   if(convert) {
    Bitmap tmpImage = Bitmap.createBitmap(width, height, Config.ARGB_8888);
    Canvas canvas = new Canvas(tmpImage);
    canvas.drawBitmap(mBitmap, new Matrix(), null);
      
    mBitmap.recycle();
    
    tmpImage.copyPixelsToBuffer(data);
       
    tmpImage.recycle();
   } else {
    mBitmap.copyPixelsToBuffer(data);
    mBitmap.recycle();
   }
   
   data.position(0);
    
   gl.glTexImage2D(GL10.GL_TEXTURE_2D, 0, GL10.GL_RGBA, width, height, 0, GL10.GL_RGBA, GL10.GL_UNSIGNED_BYTE, 
     data);
   data.clear();
   data = null;

MathUtils.java

public class MathUtils {

 static public int nextPowerOfTwo(int value) {
  if (value == 0)
   return 1;
  if ((value & value - 1) == 0)
   return value;
  value |= value >> 1;
  value |= value >> 2;
  value |= value >> 4;
  value |= value >> 8;
  value |= value >> 16;
  return value + 1;
 }

 static public boolean isPowerOfTwo(int value) {
  return value != 0 && (value & value - 1) == 0;
 }
}

So here if we have a non-power of 2, we set the convert falg to true and create a bitmap with closest size.

Useful links

2011-10-27T20:12:00.000+03:00

I thought some of you guys want to know smth new about Android, so here are the links to pages I've studied recently:

Android Fragments API:

http://android-developers.blogspot.com/2011/02/android-30-fragments-api.html

CommonsWare (just buy and read it, this guy answers a lot of common questions):

http://commonsware.com/

In-app purchases for Android:

http://developer.android.com/guide/market/billing/billing_overview.html

Google TV (russian):

http://www.youhtc.ru/2011/08/predvaritelnaya-versiya-google-tv-dlya-android-sdk/

Android 4.0 face recognition:

http://arstechnica.com/gadgets/news/2011/10/first-look-android-40-sdk-opens-up-face-recognition-apis.ars

Flurry Mobile analytics

2011-10-27T17:44:00.002+03:00

Sad, but Flurry Analytics didn't help.
The workflow is very simple.
You sign in, register an application, and then download an SDK and a application key.
Add the library to your project.
Then in the onStart() method of each activity You call FlurryAgent.onStartSession(this, "YOUR KEY HERE")
And call FlurryAgent.onEndSession(this) in onStop(). That's all! The info appears on the statistics page on about 30 minutes, which is way faster that Google Analytics.
But, this SDK can't track data to multiple keys at one time too.

Google Analytics tracking multiple accounts

2011-10-27T16:06:00.000+03:00

Hi.
Yesterday one of my project's lead decided to track analytics data in Google Analytics http://www.google.com/analytics/ system.
Simple.
But: we also needed to track data for two accounts at one time (don't ask me why :).

The problem is that GoogleAnalyticsTracker object is a singleton object. Because of this, we can have only one tracking account in the application. On the Web, this problem can be overrided, but on Android and iOS it can't be because of Google SDK restrictions.
Here is the StackOverflow ticket with the same problem.

Now I'm looking at Flury http://www.flurry.com/, maybe this system will help us?

New Lorax App!

2011-10-27T15:53:00.000+03:00

Here's the Official Lorax application on Android Market: https://market.android.com/details?id=com.lorax that I've developed. It took a week to write it, used OpenGL for drawing mouth. Have fun!

Google Developer Day 2011 Moscow souvenirs

2011-10-12T15:28:00.000+03:00

This Monday I was at GDD2011 in Moscow.

Well, must say that I expecter more hardcore lections, but it was fine anyway.

He are my souvenirs from this event :)

There's also a t-shirt and a bag. will show them when I get home.

UPD: here they are :)

Let's start

2011-10-12T15:17:00.000+03:00

So, this will be our simple Android developer's blog. Here I will share my little experience with all you. I'm open for questions, conversations and discussing.