如何在不重叠的情况下切换片段?

时间:2016-12-12 04:50:55

标签: android android-fragments swiperefreshlayout

所以我使用SwipeRefreshLayout和Fragments作为我正在处理的简单应用程序,我有三个文件: 1.app_bar_main.xml,其中包含一个FrameLayout,它是代码片段的容器:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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:fitsSystemWindows="true"
    tools:context="com.example.surafel.tryingfragment.MainActivity">
    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>
    <FrameLayout
        android:id="@+id/fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="58dp"
        >

    </FrameLayout>
    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>

2.fragment_main.xml包含主要片段的组件,SwipeRefreshLayout代表代码:

<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/refreshMainContent"
    tools:context="com.example.surafel.tryingfragment.MainFragment">
    <ScrollView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">
            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="MAIN"
                android:padding="8dp"
                android:textColor="#fff"
                android:background="@color/colorPrimary"
                android:textSize="28sp"
                android:id="@+id/buttonmain"
                android:layout_centerVertical="true"
                android:layout_centerHorizontal="true"
                />
        </RelativeLayout>
    </ScrollView>
</android.support.v4.widget.SwipeRefreshLayout>

3.MainFragment.java这是fragment_main.xml的java代码,代码是

//i have imported all the necessary classes
public class MainFragment extends Fragment  implements SwipeRefreshLayout.OnRefreshListener {

    SwipeRefreshLayout swipeView;

    public MainFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View layout = inflater.inflate(R.layout.fragment_main,container,false);
        swipeView = (SwipeRefreshLayout) layout.findViewById(R.id.refreshMainContent);
        swipeView.setColorSchemeColors(getResources().getColor(android.R.color.holo_blue_dark),getResources().getColor(android.R.color.holo_red_dark),getResources().getColor(android.R.color.holo_green_light),getResources().getColor(android.R.color.holo_orange_dark));

    swipeView.setOnRefreshListener(this);

        return layout;
    }

    public void onRefresh() {
    Log.d("Refreshing","The refresh is working");

    }

}

4.i还有MainActivity.java,它在这里管理片段事务代码:    - 当选择一个菜单项时,它会传递setFragment方法的位置,并且该方法使用switch语句来处理它

private void setFragment(int position) {

        FragmentManager fragmentManager;
        FragmentTransaction fragmentTransaction;
        switch (position) {
            case 0:
                fragmentManager = getSupportFragmentManager();
                fragmentTransaction = fragmentManager.beginTransaction();
                MainFragment mainFragment = new MainFragment();
                fragmentTransaction.replace(R.id.fragmentContainer, mainFragment);
                fragmentTransaction.commit();
                break;
            case 1:
                fragmentManager = getSupportFragmentManager();
                fragmentTransaction = fragmentManager.beginTransaction();
                GradesFragment gradesFragment = new GradesFragment();
                fragmentTransaction.replace(R.id.fragmentContainer, gradesFragment);
                fragmentTransaction.commit();
                break;
        }

    } 

当程序启动时,主片段加载和everthing工作正常,如在片段之间切换,但是当我开始刷新主片段时 复习出现但是当我切换到grade碎片时,它刷新它与两个碎片重叠,等级碎片将出现在主碎片下面。 但是当我等待刷新完成并切换片段时,它工作正常。 当等级片段可见时,我试图停止引用,但它似乎解决了问题。 所以任何人都可以帮助我,我发布了所有代码,因为我认为它可能是有用的,谢谢。  this is the screenshot

1 个答案:

答案 0 :(得分:1)

在onDestroy()或onPause()中尝试此操作。它会对你有用。

 @Override
 public void onPause() {
        super.onPause();
     if (swipeRefreshLayout != null) {
          swipeRefreshLayout.setRefreshing(false);
          swipeRefreshLayout.destroyDrawingCache();
          swipeRefreshLayout.clearAnimation();
     }
 }