Question

I saw this question: how to run one thread after complete another thread , but the answer to it is not appropriate for me.

I have such kind of java code for Android:

public void startTask(Runnable r)
    {
        running = true;
        Log.i(tag, "-----------start.Runnable-----------");

        Thread first = new Thread(r);
        first.start();

        Thread second = new Thread(new Runnable() {

            @Override
            public void run() {
                // TODO Auto-generated method stub
                running = false;
            }
        });
}

first Thread takes as param Runnable object with some hard operation which I am processing in background service. So, when I call method: startTask() I set running = true; to prevent double executing tasks. But, also, I need right after completeness of first thread start second thread to set running = false; to enable other operations to execute.

How can I wait completeness of first thread by second not to freeze main thread?? Thanks!

Answer 1

Try this:

final Thread first = new Thread(r);
first.start();

Thread second = new Thread(new Runnable() {

    @Override
    public void run() {
        first.join();
        // TODO Auto-generated method stub
        running = false;
    }
});
second.start();

I changed:

• add final keyworrd for ‘first’
• wait finish of first thread by #join at begin of second thread.
• start sencond thread soon.