使Java Runnable连续运行

Question

How to make a class that implements a java.lang.Runnable interface to run continuously without blocking the whole application.

For example:

private void startHandler(UsbDevice d) {
    if (mLoop != null) {
        mConnectionHandler.onErrorLooperRunningAlready();
        return;
    }
    mLoop = new UsbRunnable(d);
    mUsbThread = new Thread(mLoop);
    mUsbThread.start();
}

Need to make the mLoop 's run() method to run continuously. UsbRunnable implements the Runnable interface.

Answer 1

How to make a class that implements a java.lang.Runnable interface to run continuously without blocking the whole application.

You need two things:

• A loop inside the run() method
• A call which blocks, usually by communicating with your device

public class USBRunnable implements Runnable {

  public void run() {
      while (isRunning) {
          data = readFromUSBDevice();  // waits until data is available, returns the data read
          processData(data);
      }
   }
}

Answer 2

The typical way is to put a loop in run :

public void run() {
    while (!terminationCondition) {
        // Do work
    }
}

run should model the total work the Runnable needs to do, not just one iteration of that work. So if it needs to do repeated work until it's stopped, you use a loop to do exactly that.

Answer 3

Can have a while (true){......} Loop inside the run method of the class that implements runnable. Can mark this thread as deamon.