Check whether your app is running on Android Emulator or Android Mobile

Hello guys, following is simple code which check's whether your android app is running on emulator or Mobile device

           
  if("google_sdk".equals(Build.MODEL))
{
// Emulator
}
else
{
//Mobile
}

Android Emulator lost internet connection after some time and show an error on reset "Adb connection Error:An existing connection was forcibly closed by the remote host"

Step 1 : 

Before doing anything, add your "jdk\bin" path and  "android-sdk-windows\platforms\android-4\tools" in your environment variables. 

Example : I have added following paths in my environment variables at a time separated with semicolon 

D:\Android\android-sdk-windows\tools;D:\Android\android-sdk-windows\platforms\android-4\tools;C:\Java\jdk1.7.0_05\bin;C:\Users\admin\.android;C:\openjdk-7-b146-windows-i586-20_jun_2011\java-se-7-ri\bin

Step 2 :

Open cmd and type :

adb kill-server
adb start-server

It assigns new port and then internet will be starts on your emulator.

Android : Copy your database from assets folder to device

This is a sample class which will help you quickly copy your database from assets folder to the android device. Simply make a new class in your project named as DataBaseHelper

       public class DataBaseHelper {

    // The system path of your application database.
       private static String DATABASE_PATH;


    // Your database name
       private static final String DATABASE_NAME = "kbc_t8.sqlite";

    // Your database version
       private static final int DATABASE_VERSION = 1;
    // defining table name so that you don't have to change the table name
    // everywhere if your table name    
    // changes. Just change it here

    private static final String TABLE_NAME = "table";


 // Columns
    private static final String QUESTIONS_COLUMN_ID = "_id";
    private static final String QUESTIONS_COLUMN_LEVEL = "level";

    private static final String[] questions_columns =

{ QUESTIONS_COLUMN_ID, QUESTIONS_COLUMN_LEVEL,};

// to store the context of the class that is calling the database
    private Context contextSql;

    private SQLiteDatabase dbObj;
    private SqliteOpenHelper helperObj;

     //constructor of database class
       DataBaseHelper(Context context) {
       contextSql = context;


    //making your path more adjustable so you don't have to change the package name it will take by default
        DATABASE_PATH = "/data/data/" + context.getPackageName()
                + "/databases/";
    }

    public void open() throws SQLException
   {
        helperObj = new SqliteOpenHelper(contextSql);
        dbObj = helperObj.getWritableDatabase();
    }

    public void close()
{
        if (dbObj != null)
            dbObj.close();

        helperObj.close();
    }

    public class SqliteOpenHelper extends SQLiteOpenHelper {

            public SqliteOpenHelper(Context context)
       {
               super(context, DATABASE_NAME, null, DATABASE_VERSION);
            // TODO Auto-generated constructor stub

          
        }

        @Override
        public void onCreate(SQLiteDatabase db)
       {
            // TODO Auto-generated method stub

            try
            {
                    copyDataBase();
            }
           catch (IOException e)
            {
                // throw new Error("Error copying database");
                   Log.e("copy_db", "Error copying database");
            }         
        }

            //Copies your database from your local assets-folder to the empty database

               private void copyDataBase() throws IOException {

            // Open your db as input stream
                InputStream inputStream = contextSql.getAssets().open(DATABASE_NAME);

            // Path to new db
               String outFileName = DATABASE_PATH + DATABASE_NAME;

            // Open new db of device
               OutputStream outputStream = new FileOutputStream(outFileName);

            // transfer bytes from the inputfile to the outputfile
               byte[] data = new byte[1024];
               int length;
               while ((length = inputStream.read(data)) > 0) {
               outputStream.write(data, 0, length);
            }

            // Close what you have opened
               outputStream.flush();
               outputStream.close();
               inputStream.close();

        }

             @Override
             public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            // TODO Auto-generated method stub

            db.execSQL("DROP TABLE IF EXISTS " + TABLE_QUESTIONS);
            onCreate(db);

        }

    }