如何在Android中停止Handler [英] How to stop Handler in Android

问题描述

在我的应用程序中，我使用Gridview创建了一个日历，并且在该Gridview中，我借助Imageview显示了日期和一些事件的可用性，并为此创建了一个处理程序.

In my application I have created a calendar with Gridview and in that Gridview I am displaying dates and some availability of events with the help of Imageview and to do this I have created a handler.

现在我要停止处理程序.

Now I want to stop the handler.

MainActivity.java

// inside oncreate

Handler handler = new Handler();
refreshCalendar();

// outside oncreate

public void refreshCalendar() { 
    calAdapter.refreshDays();
    calAdapter.notifyDataSetChanged();
    handler.post(calendarUpdater);
    calTitle.setText(android.text.format.DateFormat.format("MMMM yyyy", cal));
}
public Runnable calendarUpdater = new Runnable() {

    @Override
    public void run() {
        items.clear();
        allData = new ArrayList<HashMap<String,String>>();
        allData.clear();
        allData = db.showAllEvents();

        String currentDate = (String)android.text.format.DateFormat.format("MM/yyyy", cal);
        for(int i=0; i<allData.size(); i++)
        {
            String date[] = allData.get(i).get("date").split("/");
            String md[] = currentDate.split("/");
            if(date[1].equals(md[0]) && date[2].equals(md[1]))
            {
                items.add(date[0]);
                System.out.println("dates: "+date[0]);
            }
        }
        calAdapter.setItems(items);
        calAdapter.notifyDataSetChanged();
    }
};

请告诉我如何以及在何处禁用此线程.

Please tell me how and where I should disable this thread.

推荐答案

您可以使用它来停止可运行的

You can use this to stop that runnable

handler.removeCallbacks(calendarUpdater);

removeCallbacks(Runnable r):删除消息队列中所有 Runnable r 的待处理帖子.

removeCallbacks(Runnable r) :Remove any pending posts of Runnable r that are in the message queue.

修改

您可以像这样组织代码

在 MainActivity.java

Handler handler = new Handler();
refreshCalendar()

//outside  oncreate 

public void refreshCalendar() { 
    calAdapter.refreshDays();
    calAdapter.notifyDataSetChanged();
    startRepeatingTask();
    calTitle.setText(android.text.format.DateFormat.format("MMMM yyyy", cal));
}

public Runnable calendarUpdater = new Runnable() {

    @Override
    public void run() {
        items.clear();
        allData = new ArrayList<HashMap<String,String>>();
        allData.clear();
        allData = db.showAllEvents();

        String currentDate = (String)android.text.format.DateFormat.format("MM/yyyy", cal);
        for(int i=0; i<allData.size(); i++)
        {
            String date[] = allData.get(i).get("date").split("/");
            String md[] = currentDate.split("/");
            if(date[1].equals(md[0]) && date[2].equals(md[1]))
            {
                items.add(date[0]);
                System.out.println("dates: "+date[0]);
            }
        }
        calAdapter.setItems(items);
        calAdapter.notifyDataSetChanged();
        handler.postDelayed(calendarUpdater,5000); // 5 seconds
    }
};

void startRepeatingTask()
{
    calendarUpdater.run(); 
}

void stopRepeatingTask()
{
    handler.removeCallbacks(calendarUpdater);
}

现在，您只需调用 startRepeatingTask()即可发布消息并停止使用 stopRepeatingTask()

Now you can just call startRepeatingTask() to posting message and to stop use stopRepeatingTask()

继承自以下链接

重复执行某个任务有时间延迟吗?

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