new Runnable but no new thread

Question

I m trying to understand the code here   specifically the anonymous class  private Runnable mUpdateTimeTask   new Runnable     public void run        final long start   mStartTime     long millis   SystemClock uptimeMillis   - start     int seconds    int   millis   1000      int minutes   seconds   60     seconds       seconds   60      if  seconds  lt  10           mTimeLabel setText      minutes     0    seconds        else          mTimeLabel setText      minutes         seconds                        mHandler postAtTime this             start      minutes   60    seconds   1    1000              The article says      The Handler runs the update code as a part of your main thread  avoiding the overhead of a second thread     Shouldn t creating a new Runnable class make a new second thread  What is the purpose of the Runnable class here apart from being able to pass a Runnable class to postAtTime   Thanks

User · Answer

Shouldn t creating a new Runnable class make a new second thread     No  new Runnable does not create second Thread      What is the purpose of the Runnable class here apart from being able to pass a Runnable class to postAtTime    Runnable is posted to Handler  This task runs in the thread  which is associated with Handler   If Handler is associated with UI Thread  Runnable runs in UI Thread   If Handler is associated with other HandlerThread  Runnable runs in HandlerThread    To explicitly associate Handler to your MainThread   UI Thread   write below code   Handler  mHandler   new Handler Looper getMainLooper      If you write is as below  it uses HandlerThread Looper   HandlerThread handlerThread   new HandlerThread  HandlerThread    handlerThread start    Handler requestHandler   new Handler handlerThread getLooper

User · Answer

A thread is something like some branch  Multi-branched means when there are at least two branches  If the branches are reduced  then the minimum remains one  This one is although like the branches removed  but in general we do not consider it branch   Similarly when there are at least two threads we call it  multi-threaded program  If the threads are reduced  the minimum remains one  Hello program is a single threaded program  but no one needs to know multi-threading to write or run it    In simple words when a program is not said to be having threads  it means that the program is not a multi-threaded program  more over in true sense it is a single threaded program  in which YOU CAN put your code as if it is multi-threaded   Below a useless code is given  but it will suffice to do away with your some confusions about Runnable  It will print   Hello World    class NamedRunnable implements Runnable        public void run        The run method prints a message to standard output          System out println  Hello World               public static void main String  arg            NamedRunnable namedRunnable   new NamedRunnable             namedRunnable run

User · Answer

Runnable is just an interface  which provides the method run  Threads are implementations and use Runnable to call the method run

User · Answer

The Runnable interface is another way in which you can implement multi-threading other than extending the Thread class due to the fact that Java allows you to extend only one class   You can however  use the new Thread Runnable runnable  constructor  something like this   private Thread thread   new Thread new Runnable     public void run        final long start   mStartTime     long millis   SystemClock uptimeMillis   - start     int seconds    int   millis   1000      int minutes   seconds   60     seconds       seconds   60      if  seconds  lt  10           mTimeLabel setText      minutes     0    seconds        else          mTimeLabel setText      minutes         seconds                        mHandler postAtTime this             start      minutes   60    seconds   1    1000              thread start

User · Answer

Runnable is often used to provide the code that a thread should run  but Runnable itself has nothing to do with threads   It s just an object with a run   method   In Android  the Handler class can be used to ask the framework to run some code later on the same thread  rather than on a different one   Runnable is used to provide the code that should run later

User · Answer

If you want to create a new Thread   you can do something like this     Thread t   new Thread new Runnable     public void run           your code goes here

User · Answer

You can create a thread just like this    Thread thread   new Thread new Runnable                         public void run                                                                       thread start      Also  you can use Runnable  Asyntask  Timer  TimerTaks and AlarmManager to excecute Threads

User · Answer

Best and easy way is just pass argument and create instance and call   thread method   Call thread using create a thread object and send a runnable class object with parameter or without parameter  and start method of thread object   In my condition I am sending parameter and I will use in run method      new Thread new FCMThreadController  2   null   3    1    start      OR     new Thread new FCMThreadController    start      public class FCMThreadController implements Runnable   private String type  private List lt UserDeviceModel gt  devices  private String message  private String id        public FCMThreadController String type  List lt UserDeviceModel gt  devices  String message  String id             this type   type          this devices   devices          this message   message          this id   id               public FCMThreadController                   Override     public void run                TODO Auto-generated method stub

[java] new Runnable() but no new thread?

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