如何删除 activity 布局上的片段

Question

我真的是 android 开发的新手。我创建了一个简单的 main activity 并在左上角添加了一个图标。单击它我可以显示空白 fragment.on 我的屏幕替换在 onCreate 方法中加载的布局。现在单击另一个图标我想隐藏该片段并再次加载该布局。怎么做？？有帮助吗？？下面是我的代码

 //part of oncreate where my layout is loaded
    protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            }

     // part of code when icon clicked and fragment is loaded
             FragmentManager fragmentManager = getFragmentManager();
             FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
               BlankFragment  frag = new BlankFragment();
             fragmentTransaction.replace(R.id.content_main, frag);
                        fragmentTransaction.commit();

                        //another nearby icon clicked
    //now i want to replace this fragment from content_main layout

    //what code to add??

Answer 1

如果我答对了你的问题，那么我猜这就是正确答案。

 //keep track of all fragments you add by tagging

 fragmentTransacaction.add(R.id.content, new FragA(), "first");

 //and when removeing
 Fragment f = getFragmentManager().findFragmentByTag("first");
 if(f!=null) fragmentTransac.remove(f);
 fragmentTransac.commit();

我从 here

那里得到了这个

Answer 2

您可以通过以下代码切换可见性。

public void toggleVisibility(Fragment fragment){

    FragmentTransaction transaction = getFragmentManager().beginTransaction();

    if (fragment.isHidden()) {
        transaction.show(fragment);
    } else {
        transaction.hide(fragment);
    }

    transaction.commit();
}

如何删除 activity 布局上的片段

how to remove fragment over an activity layout

android

android-layout

android-fragments

fragmentmanager