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What is the faster way to add the items from a class to an ArrayList to create a ListView?

public class LengthConversion {
public static final String M_TO_CM = "meter to centimeter";
public static final String M_TO_MM = "meter to millimeter";
public static final String M_TO_DM = "meter to decimeter";
public static final String KM_TO_M = "kilometer to meter";
public static final String INCH_TO_M = "inch to meter";
public static final String FOOT_TO_M = "foot to meter";
public static final String ASM_TO_M = "angstrom to meter";
public static final String FM_TO_M = "fermi to meter";
public static final String MILE_TO_KM = "mile to kilometer";}
I am adding these string to the ArrayList one by one by .add() function. Is there another way?

Maybe you need an enum:
public enum LengthConversion {
M_TO_CM("meter to centimeter"),
M_TO_MM("meter to millimeter"),
M_TO_DM("meter to decimeter"),
KM_TO_M("kilometer to meter"),
INCH_TO_M("inch to meter"),
FOOT_TO_M("foot to meter"),
ASM_TO_M("angstrom to meter"),
FM_TO_M("fermi to meter"),
MILE_TO_KM("mile to kilometer");
public final String conversion;
LengthConversion(String conversion) {
this.conversion = conversion;
}
}

Append a string to a static final String declared in an abstract class

I have the following abstract class
public abstract class IStreamSorterTest<T> {
protected static String FOLDER_NAME = null;
protected static String FILE_EXT = null;
protected static String SCHEMA_FILE_EXT = null;
protected static final String PATH_PREFIX = "src/test/resources/" + FOLDER_NAME;
protected static final String USERS_FILE = "users" + FILE_EXT;
protected static final String SORTED_USERS_FILE = "sorted_users" + FILE_EXT;
protected static final String USERS_XML_SCHEMA = "users_schema" + SCHEMA_FILE_EXT;
Extended by several classes in which I would like to ONLY define the variables FOLDER_NAME, FILE_EXT and SCHEMA_FILE_EXT without creating new variables.
What is the best way to do it?

You can't make these variables static as they would only exist in the superclass.
You could pass these Strings to the abstract class' constructor:
public abstract class IStreamSorterTest<T> {
protected final String pathPrefix;
protected final String userFile;
protected final String sortedUserFile;
protected final String usersXMLSchema;
protected IStreamSorterTest(String folderName, String fileExt, String schemaFileExt) {
pathPrefix = "src/test/resources/" + folderName;
userFile = "users" + fileExt;
sortedUserFile = "sorted_users" + fileExt;
usersXMLSchema = "users_schema" + schemaFileExt;
}
}
Then in a subclass:
public class SomeClass extends IStreamSorterTest<SomeType> {
private static final String FOLDER_NAME = ...;
private static final String FILE_EXT = ...;
private static final String SCHEMA_FILE_EXT = ...;
public SomeClass() {
super(FOLDER_NAME, FILE_EXT, SCHEMA_FILE_EXT);
}
}

Realm query for latest record for each user

How would I accomplish a similar query in realm java like that one asked in this question:
how do I query sql for a latest record date for each user
Cause it seems realm lacks a group by method when fetching queries
Here's my RealmObject:
public class Memo extends RealmObject {
#Ignore
public static final int SENT = 1;
#Ignore
public static final int UNREAD = 2;
#Ignore
public static final int READ = 3;
#Ignore
public static final int PENDING = 4;
private static final String TAG = Memo.class.getName();
#PrimaryKey
public String id = "";
#Index
public String connection = "";
public String subject = "";
public String body = "";
public int status = 0;
public Date date;
public Boolean sentByMe = false;
public String remoteId = "";
public Boolean isFile = false;
public String filepath = "";
}
This represents the user:
public String connection

RealmResults<Memo> latestMemos = realm.where(Memo.class)
.findAllSorted("date", Sort.DESCENDING)
.distinct("connection");

Obtain informations on supported media formats programmatically?

How can I obtain information about device supported media formats?
I'm targeting everything from API 15 and up and I would like to know for example which profile of "h264/avc" device supports.

See these classes:
MimeTypeMap.java (frameworks\base\core\java\android
\webkit)
Here is ContentType.java (frameworks\base\core\java\com\google\android\mms) provides all format supported by android device.
package com.google.android.mms;
import java.util.ArrayList;
public class ContentType {
public static final String MMS_MESSAGE = "application/vnd.wap.mms-message";
// The phony content type for generic PDUs (e.g. ReadOrig.ind,
// Notification.ind, Delivery.ind).
public static final String MMS_GENERIC = "application/vnd.wap.mms-generic";
public static final String MULTIPART_MIXED = "application/vnd.wap.multipart.mixed";
public static final String MULTIPART_RELATED = "application/vnd.wap.multipart.related";
public static final String MULTIPART_ALTERNATIVE = "application/vnd.wap.multipart.alternative";
public static final String TEXT_PLAIN = "text/plain";
public static final String TEXT_HTML = "text/html";
public static final String TEXT_VCALENDAR = "text/x-vCalendar";
public static final String TEXT_VCARD = "text/x-vCard";
public static final String IMAGE_UNSPECIFIED = "image/*";
public static final String IMAGE_JPEG = "image/jpeg";
public static final String IMAGE_JPG = "image/jpg";
public static final String IMAGE_GIF = "image/gif";
public static final String IMAGE_WBMP = "image/vnd.wap.wbmp";
public static final String IMAGE_PNG = "image/png";
public static final String AUDIO_UNSPECIFIED = "audio/*";
public static final String AUDIO_AAC = "audio/aac";
public static final String AUDIO_AMR = "audio/amr";
public static final String AUDIO_IMELODY = "audio/imelody";
public static final String AUDIO_MID = "audio/mid";
public static final String AUDIO_MIDI = "audio/midi";
public static final String AUDIO_MP3 = "audio/mp3";
public static final String AUDIO_MPEG3 = "audio/mpeg3";
public static final String AUDIO_MPEG = "audio/mpeg";
public static final String AUDIO_MPG = "audio/mpg";
public static final String AUDIO_MP4 = "audio/mp4";
public static final String AUDIO_X_MID = "audio/x-mid";
public static final String AUDIO_X_MIDI = "audio/x-midi";
public static final String AUDIO_X_MP3 = "audio/x-mp3";
public static final String AUDIO_X_MPEG3 = "audio/x-mpeg3";
public static final String AUDIO_X_MPEG = "audio/x-mpeg";
public static final String AUDIO_X_MPG = "audio/x-mpg";
public static final String AUDIO_3GPP = "audio/3gpp";
public static final String AUDIO_OGG = "application/ogg";
public static final String VIDEO_UNSPECIFIED = "video/*";
public static final String VIDEO_3GPP = "video/3gpp";
public static final String VIDEO_3G2 = "video/3gpp2";
public static final String VIDEO_H263 = "video/h263";
public static final String VIDEO_MP4 = "video/mp4";
public static final String APP_SMIL = "application/smil";
public static final String APP_WAP_XHTML = "application/vnd.wap.xhtml+xml";
public static final String APP_XHTML = "application/xhtml+xml";
public static final String APP_DRM_CONTENT = "application/vnd.oma.drm.content";
public static final String APP_DRM_MESSAGE = "application/vnd.oma.drm.message";
private static final ArrayList<String> sSupportedContentTypes = new ArrayList<String>();
private static final ArrayList<String> sSupportedImageTypes = new ArrayList<String>();
private static final ArrayList<String> sSupportedAudioTypes = new ArrayList<String>();
private static final ArrayList<String> sSupportedVideoTypes = new ArrayList<String>();
static {
sSupportedContentTypes.add(TEXT_PLAIN);
sSupportedContentTypes.add(TEXT_HTML);
sSupportedContentTypes.add(TEXT_VCALENDAR);
sSupportedContentTypes.add(TEXT_VCARD);
sSupportedContentTypes.add(IMAGE_JPEG);
sSupportedContentTypes.add(IMAGE_GIF);
sSupportedContentTypes.add(IMAGE_WBMP);
sSupportedContentTypes.add(IMAGE_PNG);
sSupportedContentTypes.add(IMAGE_JPG);
//supportedContentTypes.add(IMAGE_SVG); not yet supported.
sSupportedContentTypes.add(AUDIO_AAC);
sSupportedContentTypes.add(AUDIO_AMR);
sSupportedContentTypes.add(AUDIO_IMELODY);
sSupportedContentTypes.add(AUDIO_MID);
sSupportedContentTypes.add(AUDIO_MIDI);
sSupportedContentTypes.add(AUDIO_MP3);
sSupportedContentTypes.add(AUDIO_MPEG3);
sSupportedContentTypes.add(AUDIO_MPEG);
sSupportedContentTypes.add(AUDIO_MPG);
sSupportedContentTypes.add(AUDIO_X_MID);
sSupportedContentTypes.add(AUDIO_X_MIDI);
sSupportedContentTypes.add(AUDIO_X_MP3);
sSupportedContentTypes.add(AUDIO_X_MPEG3);
sSupportedContentTypes.add(AUDIO_X_MPEG);
sSupportedContentTypes.add(AUDIO_X_MPG);
sSupportedContentTypes.add(AUDIO_3GPP);
sSupportedContentTypes.add(AUDIO_OGG);
sSupportedContentTypes.add(VIDEO_3GPP);
sSupportedContentTypes.add(VIDEO_3G2);
sSupportedContentTypes.add(VIDEO_H263);
sSupportedContentTypes.add(VIDEO_MP4);
sSupportedContentTypes.add(APP_SMIL);
sSupportedContentTypes.add(APP_WAP_XHTML);
sSupportedContentTypes.add(APP_XHTML);
sSupportedContentTypes.add(APP_DRM_CONTENT);
sSupportedContentTypes.add(APP_DRM_MESSAGE);
// add supported image types
sSupportedImageTypes.add(IMAGE_JPEG);
sSupportedImageTypes.add(IMAGE_GIF);
sSupportedImageTypes.add(IMAGE_WBMP);
sSupportedImageTypes.add(IMAGE_PNG);
sSupportedImageTypes.add(IMAGE_JPG);
// add supported audio types
sSupportedAudioTypes.add(AUDIO_AAC);
sSupportedAudioTypes.add(AUDIO_AMR);
sSupportedAudioTypes.add(AUDIO_IMELODY);
sSupportedAudioTypes.add(AUDIO_MID);
sSupportedAudioTypes.add(AUDIO_MIDI);
sSupportedAudioTypes.add(AUDIO_MP3);
sSupportedAudioTypes.add(AUDIO_MPEG3);
sSupportedAudioTypes.add(AUDIO_MPEG);
sSupportedAudioTypes.add(AUDIO_MPG);
sSupportedAudioTypes.add(AUDIO_MP4);
sSupportedAudioTypes.add(AUDIO_X_MID);
sSupportedAudioTypes.add(AUDIO_X_MIDI);
sSupportedAudioTypes.add(AUDIO_X_MP3);
sSupportedAudioTypes.add(AUDIO_X_MPEG3);
sSupportedAudioTypes.add(AUDIO_X_MPEG);
sSupportedAudioTypes.add(AUDIO_X_MPG);
sSupportedAudioTypes.add(AUDIO_3GPP);
sSupportedAudioTypes.add(AUDIO_OGG);
// add supported video types
sSupportedVideoTypes.add(VIDEO_3GPP);
sSupportedVideoTypes.add(VIDEO_3G2);
sSupportedVideoTypes.add(VIDEO_H263);
sSupportedVideoTypes.add(VIDEO_MP4);
}
// This class should never be instantiated.
private ContentType() {
}
public static boolean isSupportedType(String contentType) {
return (null != contentType) && sSupportedContentTypes.contains(contentType);
}
public static boolean isSupportedImageType(String contentType) {
return isImageType(contentType) && isSupportedType(contentType);
}
public static boolean isSupportedAudioType(String contentType) {
return isAudioType(contentType) && isSupportedType(contentType);
}
public static boolean isSupportedVideoType(String contentType) {
return isVideoType(contentType) && isSupportedType(contentType);
}
public static boolean isTextType(String contentType) {
return (null != contentType) && contentType.startsWith("text/");
}
public static boolean isImageType(String contentType) {
return (null != contentType) && contentType.startsWith("image/");
}
public static boolean isAudioType(String contentType) {
return (null != contentType) && contentType.startsWith("audio/");
}
public static boolean isVideoType(String contentType) {
return (null != contentType) && contentType.startsWith("video/");
}
public static boolean isDrmType(String contentType) {
return (null != contentType)
&& (contentType.equals(APP_DRM_CONTENT)
|| contentType.equals(APP_DRM_MESSAGE));
}
public static boolean isUnspecified(String contentType) {
return (null != contentType) && contentType.endsWith("*");
}
#SuppressWarnings("unchecked")
public static ArrayList<String> getImageTypes() {
return (ArrayList<String>) sSupportedImageTypes.clone();
}
#SuppressWarnings("unchecked")
public static ArrayList<String> getAudioTypes() {
return (ArrayList<String>) sSupportedAudioTypes.clone();
}
#SuppressWarnings("unchecked")
public static ArrayList<String> getVideoTypes() {
return (ArrayList<String>) sSupportedVideoTypes.clone();
}
#SuppressWarnings("unchecked")
public static ArrayList<String> getSupportedTypes() {
return (ArrayList<String>) sSupportedContentTypes.clone();
}
}
check related details here - http://developer.android.com/reference/android/media/package-summary.html
Hope this helps you.

Change color of java console output

I was wondering if there is someway for me to set the color of the text that I output to the console in Java. It does not matter if it is system specific as the program will only be run on my Windows 7 x64 laptop.
This question: Change color in java eclipse console was asked several weeks ago and had a good solution(by #VonC) to a similar problem however it only addressed the issue inside eclipse.
Can the same effect be achieved if I execute my program from the command line? and if so how?

You can take a look at the Java Curses Library:
http://sourceforge.net/projects/javacurses/
Here's an entry on how to use it:
http://www.javaworld.com/javaworld/javaqa/2002-12/02-qa-1220-console.html

thy this....
furthermore read http://jansi.fusesource.org/
public static final String ANSI_RESET = "\u001B[0m";
public static final String ANSI_BLACK = "\u001B[30m";
public static final String ANSI_RED = "\u001B[31m";
public static final String ANSI_GREEN = "\u001B[32m";
public static final String ANSI_YELLOW = "\u001B[33m";
public static final String ANSI_BLUE = "\u001B[34m";
public static final String ANSI_PURPLE = "\u001B[35m";
public static final String ANSI_CYAN = "\u001B[36m";
public static final String ANSI_WHITE = "\u001B[37m";

Another library you may be interested in is Jansi: http://jansi.fusesource.org/
Jansi interprets ANSI code and format them for the console output. It works for both unix and windows.
Update 11/2014: you can also see the github Page

Not directly related to Java console output, but if you're looking to use ANSI colors in Kotlin console output, this is a great library to use - https://github.com/importre/crayon

I needed colors for a project. Here is a class for everyone. Just do Colors.(color) + "whatever" to add color, bold, or italic. Use Colors.reset to reset the colors. Hope this helps.
package util;
public class Colors {
public static final String reset = "\u001B[0m";
public static final String bold = "\u001b[1m";
public static final String italic = "\u001b[3m";
public static final String underline = "\u001b[4m";
public static final String reversed = "\u001b[7m";
public static final String black = "\u001b[30m";
public static final String blue = "\u001b[34m";
public static final String cyan = "\u001b[36m";
public static final String green = "\u001b[32m";
public static final String magenta = "\u001b[35m";
public static final String red = "\u001b[31m";
public static final String white = "\u001b[37m";
public static final String yellow = "\u001b[33m";
public static final String brightBlack = "\u001b[30;1m";
public static final String brightBlue = "\u001b[34;1m";
public static final String brightCyan = "\u001b[36;1m";
public static final String brightGreen = "\u001b[32;1m";
public static final String brightMagenta = "\u001b[35;1m";
public static final String brightRed = "\u001b[31;1m";
public static final String brightWhite = "\u001b[37;1m";
public static final String brightYellow = "\u001b[33;1m";
public static final String bgBlack = "\u001b[40m";
public static final String bgBlue = "\u001b[44m";
public static final String bgCyan = "\u001b[46m";
public static final String bgGreen = "\u001b[42m";
public static final String bgMagenta = "\u001b[45m";
public static final String bgRed = "\u001b[41m";
public static final String bgWhite = "\u001b[47m";
public static final String bgYellow = "\u001b[43m";
public static final String bgBrightBlack = "\u001b[40;1m";
public static final String bgBrightBlue = "\u001b[44;1m";
public static final String bgBrightCyan = "\u001b[46;1m";
public static final String bgBrightGreen = "\u001b[42;1m";
public static final String bgBrightMagenta = "\u001b[45;1m";
public static final String bgBrightRed = "\u001b[41;1m";
public static final String bgBrightWhite = "\u001b[47;1m";
public static final String bgBrightYellow = "\u001b[43;1m";
}