android - 未删除或替换 Android 片段
问题描述
我正在尝试从容器中删除或替换片段。该片段是在活动的 onCreate() 上创建的,一旦单击按钮就会消失。但是,我无法删除或替换片段。
出于绝望,我试图用相同背景颜色的空白片段替换容器,但是空白片段只是显示在另一个片段下方而不是被替换。我有一种方法可以清除除dashboardInfoFragment 之外的每个实例中都有效的所有片段。我不确定是因为我在 onCreate() 中创建它,还是我无法识别的其他东西。我使用替换得到的结果与使用片段事务添加相同。我从来没有能够从这个应用程序中删除单个片段,但 clearFragments() 适用于所有其他片段。
我浏览了关于这个主题的无数帖子并尝试了所有方法,但我无法通过引用片段、标签或 clearFragments() 来删除这个片段,所以任何帮助都将不胜感激。
这是活动的相关片段
public class DashboardActivity extends AppCompatActivity {
DashboardInfoFragment dashboardInfoFragment;
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dashboard);
dashboardInfoFragment = DashboardInfoFragment.newInstance();
replaceFragment(R.id.dashboard_table_fragment_place, dashboardInfoFragment, "dashboardInfoFragment");
menuButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!isClassMenuOpen) {
startClassMenu();
} else {
clearAllFragments();
startClassMenu();
}
}
});
homeButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
clearAllFragments();
replaceFragment(R.id.dashboard_table_fragment_place, dashboardInfoFragment, "dashboardInfoFragment");
}
});
}
public void startClassMenu() {
clearAllFragments();
// This doesn't work
removeSingleFragment(R.id.dashboard_table_fragment_place, dashboardInfoFragment, "dashboardInfoFragment");
dashboardInfoFragment = DashboardInfoFragment.newInstance();
replaceFragment(R.id.dashboard_table_fragment_place, dashboardInfoFragment, "dashboardInfoFragment");
// Trying to replace with blank fragment but gets displayed below the dashboardInfoFragment
blankFragment = BlankFragment.newInstance();
replaceFragment(R.id.dashboard_table_fragment_place, blankFragment, "blankFragment");
ClassMenuFragment classMenuFragment = ClassMenuFragment.newInstance(classList);
replaceFragment(R.id.class_menu_fragment_place, classMenuFragment, "classMenuFragment");
}
// Removes all fragments except for dashboardInfoFragment
public void clearAllFragments() {
try {
FragmentManager manager = getSupportFragmentManager();
manager.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
isClassMenuOpen = false;
isSettingsMenuOpen = false;
isModuleOptionsMenuOpen = false;
} catch (Exception e) {
e.printStackTrace();
}
}
public void replaceFragment(int id, Fragment fragment, String tag) {
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(id, fragment);
transaction.addToBackStack(tag);
transaction.commit();
}
// Some of my attempts at removing the fragment
public void removeSingleFragment(int container, Fragment fragment, String tag) {
// if (getSupportFragmentManager().findFragmentById(container) != null) {
// getSupportFragmentManager()
// .beginTransaction().
// remove(getSupportFragmentManager().findFragmentById(container)).commit();
// }
//
// getSupportFragmentManager()
// .beginTransaction()
// .replace(container, fragment)
// .commit();
//FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
// if (fragment != null) {
// transaction.remove(fragment);
// transaction.commit().setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
// fragment = null;
//
// }
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
if(fragment!=null&&fragment.isAdded()) {
transaction = fragmentManager.beginTransaction();
transaction.remove(fragment);
transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_CLOSE);
transaction.commitAllowingStateLoss();
}
transaction = fragmentManager.beginTransaction();
transaction.replace(container, fragment, tag).commit();
}
}
});
}