Java Producer-Consumer，陷阱在第一个周期后睡觉

Question

java中有简单的生产者/消费者功能。问题是只经过一个周期，都进入睡眠陷阱并且没有醒来。问题是消费者没有通知生产者使其清醒。在我的情况下，消费者不应该与生产者在同一个对象/类中。

我做错了吗？

这是我的实施：

package test.myapplication;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

import java.util.Random;

public class MainActivity extends AppCompatActivity {
boolean isProduced = false;
Producer producer;
int theValue;
Random r = new Random();

public synchronized void consumer()
{
        if (!isProduced) {
            try {
                System.out.println("WAIT Consumer");
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println("Consumed: " + theValue);
        isProduced = false;
        this.notify();
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    producer = new Producer();
    producer.start();

    new  Thread( new Runnable() {
        public void run() {
            while(true) {
                consumer();
            }
        }
    }).start();
}


// ----------------PRODUCER CLASS------------------------
protected class Producer implements Runnable {

    protected Thread thread;

    protected void start() {
        thread = new Thread(this, "Producer");
        thread.start();
    }

    //@Override
    public void run() {

        synchronized (this) {
            while (thread != null) {

                if (isProduced) {
                    try {
                        System.out.println("WAIT Producer");
                        this.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                theValue = r.nextInt(10);
                System.out.println("Produced: " + theValue);
                isProduced = true;
                this.notify();
            }
        }
    }
}
}