在 Activity 内部，如何暂停 for 循环以调用片段，然后在按钮单击片段后恢复循环以重新开始

Posted 2023-04-15

【中文标题】在 Activity 内部，如何暂停 for 循环以调用片段，然后在按钮单击片段后恢复循环以重新开始

【英文标题】：Inside Activity, How to pause a for loop to call a fragment and after button click on fragment then resume the loop to start again

【发布时间】：2017-04-02 04:51:07

【问题描述】：

在我的活动中，如何让我的 for 循环暂停以调用片段。按钮上的内部片段单击如何返回活动并恢复循环以再次启动该过程。

我在活动中的一段代码在循环中启动片段

for(int i = 0; i < lQuestModels.size(); i++)
        StartMyFragment start_survey=new StartMyFragment();
        Bundle bundle = new Bundle();
        bundle.putString("survey_id", "111");
        bundle.putString("survey_name", "testing");
        bundle.putString("survey_desc", "Yes done");
        bundle.putString("survey_no_of_question", "5");
        bundle.putString("jListString", lQuestModels.get(i).toString());
        start_survey.setArguments(bundle);

        fragmentManager = getSupportFragmentManager();
        fragmentManager.popBackStack();
        fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.welcomeSurveyLayout,start_survey);
        fragmentTransaction.addToBackStack(null);
        fragmentTransaction.commit();

【问题讨论】：

是的，您可以这样做，但在我们帮助您之前，您必须展示您已经尝试过的内容。

我是 android 片段和活动通信的新手。无法想象循环将如何在 Activity 和 Fragment 之间暂停和继续。

使用处理程序概念做到了，这是UI和后台进程之间最好的沟通方式

【参考方案1】：

    I did in the following way.

In my activity (Lets say SurveyProcessorActivity)-

public static Boolean isComplete = new Boolean(true);
    private Handler mHandler ;
    for(int i = 0; i < lQuestModels.size(); i++)

    mHandler.post(new Runnable() 
                            @Override
                            public void run() 


                                StartSTSurveyFragment start_survey=new StartSTSurveyFragment();
                                Bundle bundle = new Bundle();
                                bundle.putSerializable("survey",survey);
                                bundle.putSerializable("currentQuestModel",currentQuestModel);
                                start_survey.setArguments(bundle);
                                fragmentManager = getSupportFragmentManager();
                                fragmentManager.popBackStack();
                                fragmentTransaction = fragmentManager.beginTransaction();
                                fragmentTransaction.replace(R.id.frame_processor,start_survey);
                                fragmentTransaction.addToBackStack("StartMASurveyFragment");
                                fragmentTransaction.commit();

                            

                        );

    synchronized (isComplete) 
                    try 
                        System.out.println(TAG + "Hey I'm here waiting");
                        isComplete.wait();
                     catch (InterruptedException e) 
                        e.printStackTrace();
                    
                

                System.out.println(TAG + "Hey I'm notified");
    

In my fragment on button click-

 synchronized (SurveyProcessorActivity.isComplete) 
                    SurveyProcessorActivity.isComplete.notify();