Android片段替换功能将片段放在最前面，不会删除旧的片段 [英] Android fragment replace puts fragment on top, doesn't remove old one

问题描述

我看到了类似的问题，尝试了一些方法，但没有一个起作用.我有一个 MainActivity ，其布局包含一个导航抽屉片段和一个 FrameLayout ，可用来替换我的片段.当我单击导航抽屉片段上的一个项目时，我想替换 FrameLayout 中的第一个片段.问题是替换操作后，我的片段出现在旧片段的顶部，旧片段没有被移除.

I have seen similar issues and tried a few things but none of that worked. I have a MainActivity with a layout containing a Navigation Drawer fragment and a FrameLayout, which I use to replace my fragments. When I click an item on the Navigation Drawer fragment, I want to replace the first fragment in FrameLayout. The problem is after the replace operation, my fragment appears on top of the old one, the old one isn't removed.

这是在 MainActivity 启动时添加第一个片段的代码:

Here is the code for adding the first fragment when MainActivity launches:

     protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            OptionsFragment mFragment = new OptionsFragment();

            FragmentManager manager = getSupportFragmentManager();
            FragmentTransaction transaction = manager.beginTransaction();

            transaction.replace(R.id.container, new OptionsFragment(), OPTIONS_TAG).commit();

这是 NavigationDrawerFragment 文件中发生的替换操作:

Here is the replace operation taking place in the NavigationDrawerFragment file:

 public void onNavigationDrawerItemSelected(int position) {

            Fragment fragment;

            fragment = getFragmentManager().findFragmentByTag(MainActivity.OPTIONS_TAG);
            if(fragment != null)
                getFragmentManager().beginTransaction().remove(fragment).commit();
            switch (position) {
                case 0:
                    fragment = getFragmentManager().findFragmentByTag(MainActivity.LOGIN_TAG);
                    if (fragment == null) {
                        fragment = new LoginFragment();
                    }
                    getFragmentManager().beginTransaction().replace(R.id.container, fragment, MainActivity.LOGIN_TAG).commit();
                    closeDrawer();
                    break;
        }
    }

这是XML布局:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/main_activity">

    <include
        android:id="@+id/toolbar_actionbar"
        layout="@layout/toolbar_default"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/drawer"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/toolbar_actionbar">

        <FrameLayout
            android:id="@+id/container"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:clickable="true" />

        <!-- android:layout_marginTop="?android:attr/actionBarSize"-->
        <fragment
            android:id="@+id/fragment_drawer"
            android:name="com.kristmiha.myportal2.NavigationDrawerFragment"
            android:layout_width="@dimen/navigation_drawer_width"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            app:layout="@layout/fragment_navigation_drawer"
            tools:layout="@layout/fragment_navigation_drawer" />
    </android.support.v4.widget.DrawerLayout>
</RelativeLayout>

推荐答案

我希望它能起作用: https://stackoverflow.com/a/38470075/6291068

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