我試圖在異步任務期間一個接一個地執行runnable隊列(意味着隊列中的下一個將在另一個完成後執行)。我編寫了一個管理器來管理這些可自行運行的runnable和task。然後我在異步任務中獲得第一個任務並運行它,希望它能夠通過隊列運行,但是它只是最終運行第一個runnable兩次。任何人都可以用我一直在使用的代碼來幫助我,或者指出一個可能有所幫助的例子嗎?如何實現可運行隊列
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);
}
如果可運行對象累計超過十億,會發生什麼? – User3