我在AsyncTask中进行网络调用,但我面临的问题是启动doInBackground方法所花费的时间.
这是我的代码的一部分：
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d("Temp:",System.currentTimeMillis()+"");
new Move().execute();
/*some other logic
}
}
我的AsyncTask是：
private class Move extends AsyncTask<Void,Void,Void> {
@Override
protected Void doInBackground(Void... temp) {
Log.d("start:",System.currentTimeMillis()+"");
gson.fromJson(Web.Request.get(some_URL),Void.class);
Log.d("end:",System.currentTimeMillis()+"");
return null;
}
}
这些是我得到的日志：
32658-998/com.example.game D/temp:﹕ 1408923006159
32658-998/com.example.game D/start:﹕ 1408923035163
32658-998/com.example.game D/end:﹕ 1408923035199
实际上,在doInBackground方法中到达第一行几乎需要29秒,因为完成网络调用只花了36毫秒.我尝试了很多次,所用的时间几乎是一样的.
解决方法
如果你正在运行任何其他任务,AsyncTask正在等待其他AsyncTasks完成运行(检查你是否这样做).
见here.
Order of execution
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 with HONEYCOMB,tasks are executed on a single thread to avoid common application errors caused by parallel execution.
If you truly want parallel execution,you can invoke executeOnExecutor(java.util.concurrent.Executor,Object[]) with THREAD_POOL_EXECUTOR.
