返回片段UI时如何刷新 [英] How to refresh fragment UI when come back to it

问题描述

我是Android的新手，正在学习带片段的东西，并为此做了一个演示，因为我有一个片段，可以从该片段转到另一个活动，在那里进行一些计算，然后返回到碎片当时我想将该计算值分配到片段的textview中，那么我应该使用哪种生命周期方法呢?我已经使用过onresume了，但是这是行不通的...

I am new to android and learning things with fragments and have made a demo for it,in that i am having a fragment from which we can go to another activity at there some calculation is performing and after that we come back to frgament at that time i want to dislay that calculation value to my fragment's textview,So which life cycle method should i use to do so?i already used onresume which is not working...

public void onResume () {

        super.onResume();

        //tvFollowings.setText((sharedConnect.getCurrentUser().userFollowingCount)
//              + " Following");
                System.out.print("------user count is-------" + String.valueOf(sharedConnect.getCurrentUser().userFollowingCount));
        Toast.makeText(getActivity(), "------user count is-------" + String.valueOf(sharedConnect.getCurrentUser().userFollowingCount), Toast.LENGTH_SHORT).show();

}

推荐答案

最好的方法是在onPause和onResume之间切换.甚至不必打扰家长活动

The best approach which works, toggle between onPause and onResume. No need to even bother the parent activity

private boolean allowRefresh = false;

@Override
    public void onResume() {
        super.onResume();
        //Initialize();
        if(allowRefresh){
            allowRefresh=false;
            //call your initialization code here
        }
    }

    @Override
    public void onPause() {
        super.onPause();
        if (!allowRefresh)
            allowRefresh = true;
    }

onResume总是在您的片段加载时被调用，因此allowRefresh的初始状态应该为false，这样片段不会被加载两次

onResume will always be called when your fragment gets loaded, so initial state of allowRefresh should be false so the fragment does not get loaded twice

在片段处于活动状态时打开新活动后，将调用onPause，仅在allowRefresh为false的情况下，将allowRefresh设置为true.

Once you open new activity whilst the fragment is active, onPause is called, here set allowRefresh to true only if allowRefresh is false.

当片段重新获得焦点时，请检查allowRefresh是否为true并重做初始化.良好的代码习惯是将所有初始化代码放在一个函数中.

When the fragment regains focus, check if allowRefresh is true and redo your initialization. A good code practice is put all your initialization code in one function.

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