我试图在异步任务期间一个接一个地执行runnable队列(意味着队列中的下一个将在另一个完成后执行)。我编写了一个管理器来管理这些可自行运行的runnable和task。然后我在异步任务中获得第一个任务并运行它,希望它能够通过队列运行,但是它只是最终运行第一个runnable两次。任何人都可以用我一直在使用的代码来帮助我,或者指出一个可能有所帮助的例子吗?如何实现可运行队列
public class ConnectionManager {
public static final int MAX_CONNECTIONS = 15;
private ArrayList<Runnable> active = new ArrayList<Runnable>();
private ArrayList<Runnable> queue = new ArrayList<Runnable>();
private static ConnectionManager instance;
public static ConnectionManager getInstance() {
if (instance == null)
instance = new ConnectionManager();
return instance;
}
public void push(Runnable runnable) {
queue.add(runnable);
if (active.size() < MAX_CONNECTIONS)
startNext();
}
private void startNext() {
if (!queue.isEmpty()) {
Runnable next = queue.get(0);
queue.remove(0);
active.add(next);
Thread thread = new Thread(next);
thread.start();
}
}
public void didComplete(Runnable runnable) {
active.remove(runnable);
startNext();
}
}
public class Task implements Runnable {
Context con;
String xmlFile;
File taskFile;
String Id;
public void create(Context context, String xml, File task, String id) {
this.con = context;
this.xmlFile = xml;
this.taskFile = task;
this.Id = id;
ConnectionManager.getInstance().push(this);
}
@Override
public void run() {
User.SendTask(con, xmlFile, taskFile, Id);
ConnectionManager.getInstance().didComplete(this);
}
如果可运行对象累计超过十亿,会发生什么? – User3