function btn_OnTouch()
{
    var file = app.CreateFile( "/sdcard/test.txt", "rw" );

    file.WriteText( "Hello", "Char" );
    var len = file.GetLength();
    console.log( "file len: " + len );

    file.Seek( len );
    file.WriteNumber( 77, "Byte" );
    file.WriteData( "66,121,101", "Int" );

    file.Seek( 0 );
    var data = file.ReadData( 2 );
    console.log( "first two bytes:" + data[0] + "," + data[1] );

    file.Seek( 0 );
    alert( file.ReadText( "Line" ) );

    file.Close();
}

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