我想做一个for循环等待,直到方法返回true。
对于Eg -
for(int i = 0; i < 100; i++)
{
// for loop should get executed once
my_method(i); //this method is called
// now for loop should wait till the above method returns true
// once the method returns true the for loop should continue if the condition is true
}
public boolean my_method(int number)
{
// my code
return true;
}
我不知道my_method()需要多长时间才能返回true。
以上所有代码都在AsyncTask中。
我是Android开发的新手,所以任何帮助都会非常感激。
答案 0 :(得分:1)
为什么不使用“迭代器迭代器”或“ foreach循环”,而不是仅使用for循环。因此,循环的每个下一个值将只执行前一个值,然后再执行方法。
但是对于一个选项,您将需要在整数数组中添加所有整数值,因为这两个选项都可以与数组一起使用。
//First create an array list of integer and use your same for loop to add all values in that array from 0 to 100
List<Integer> list = new ArrayList<Integer>();
for(int i = 0; i < 100; i++)
{
list.add(i);
}
//Now you should able to use whether foreach or iterator to execute method for each array (int) value one by one.
//Foreach example:
for (Integer i : list) {
my_method(i); //your method to execute
}
//Iterator example:
for (Iterator i = list.iterator(); i.hasNext();) {
my_method(i); //your method to execute
}
答案 1 :(得分:0)
根据要求:
private final ReentrantLock lock = new ReentrantLock();
private final Condition done = lock.newCondition();
for(int i=0;i<100;i++)
{
// for loop should get executed once
lock.lock();
try {
my_method(i, lock); //this method is called
done.await();
} finally {
lock.unlock();
}
// now for loop should wait till the above method returns true
// once the method returns true the for loop should continue if the condition is true
}
public boolean my_method(int number, ReentrantLock lock)
{
lock.lock();
try {
// my code
done.signal();
} finally {
lock.unlock();
}
return true;
}