AsyncTask 运行 doInBackground 是根据它的每个参数顺序还是随机的？

Question

例如，有一个 AsyncTask 的字符串... parameters ，如果我这样调用：

AsyncTask<String, Void, Void> someTask = new myTask(myActivity.this);
someTask.execute(string1 , string2 , string3);

此任务中 doInBackground 的内部执行顺序是什么：它是先处理 string1 然后再处理 string2 等等，因为它们是在调用时提供的，还是处理 parameters随机？

Answer 1

首先，参数不是随机传递的。 This answer will explain you more about parameters. Also check image from this answer。我在这里添加相同的图片以供您理解。

Answer 2

它可能在一个线程上是串行的，也可能是并行的，这实际上取决于您的应用 Android OS 的版本运行。在大多数情况下，它将在一个后台线程上串行运行。

这就是 google 文件所说的 :-

Executes the task with the specified parameters. The task returns itself (this) so that the caller can keep a reference to it.

Note: this function schedules the task on a queue for a single background thread or pool of threads depending on the platform version. When first introduced, AsyncTasks were executed serially on a single background thread. Starting with DONUT, this was changed to a pool of threads allowing multiple tasks to operate in parallel. Starting HONEYCOMB, tasks are back to being executed on a single thread to avoid common application errors caused by parallel execution. If you truly want parallel execution, you can use the executeOnExecutor(Executor, Params...) version of this method with THREAD_POOL_EXECUTOR; however, see commentary there for warnings on its use.

This method must be invoked on the UI thread.

检查这个link execute (Params... params)它会对你有帮助。

希望对您有所帮助，

谢谢。

Answer 3

String... 是一个“vararg”，在此示例中，它将所有单独的参数转换为 String[]，其中数组的条目按照它们传递到的顺序排列方法。

所以使用你的例子，(String[]) param[0] == string1, param[1] == string2, param[2] == string3 等等。这是为了param条目的排序，至于param中的每个条目如何使用，完全取决于您的代码。

AsyncTask 运行 doInBackground 是根据它的每个参数顺序还是随机的？

Does AsyncTask run the doInBackground accordingly to each of its parameter order or randomly?

android

android-asynctask