碎片没有被替换，而是放在前一个的上面

活动:

FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();


Fragment1 fragment = new Fragment1();
Fragment2 fragment2 = new Fragment2();


transaction.replace(R.id.Fragment1, fragment);
transaction.addToBackStack(null);
transaction.commit();


FragmentTransaction transaction2 = getSupportFragmentManager().beginTransaction();
transaction2.replace(R.id.Fragment1, fragment2);
transaction2.addToBackStack(null);
transaction2.commit();

视图中的代码:

<fragment
android:id="@+id/Fragment1"
android:name="com.landa.fragment.Fragment1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_below="@+id/include1" />

问题是，内容实际上并没有被替换——它被放在了顶部(所以它是重叠的)。

当我单击后退时，第一个片段将正确显示(没有第二个片段) ，但是最初两个片段都是可见的(我希望只显示最后一个片段)。

我错过了什么？

103160 次浏览
小开

You can clear backStack before replacing fragments:

    FragmentManager fm = getActivity().getSupportFragmentManager();


for (int i = 0; i < fm.getBackStackEntryCount(); i++) {
fm.popBackStack();
}


// replace your fragments
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最佳答案

You are doing two things wrong here:

  1. You cannot replace a fragment that is statically placed in an xml layout file. You should create a container (e.g. a FrameLayout) in the layout and then add the fragment programatically using FragmentTransaction.

  2. FragmentTransaction.replace expects the id of the container that contains the fragment and not the id of the fragment as the first parameter. So you should pass the first argument as the id of the container that you added the first fragment to.

You can refer to this link for more details.

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The android developer site suggests the use of a FrameLayout to load fragments dynamically at run-time. You have hard-coded the fragment in your xml file. So it cannot be removed at run-time as mentioned in this link:

http://developer.android.com/training/basics/fragments/creating.html

this link shows how to add fragments through your program:

http://developer.android.com/training/basics/fragments/fragment-ui.html

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I had a similar problem but my issue was that I was using two different Fragment managers: One from getSupportFragmentManager() and one from getFragmentManager(). If I added one fragment with the SupportFragmentManager and then tried replacing the fragment with the FragmentManager, the fragment would just get added on top. I needed to change the code so that the same FragmentManager would be used and that took care of the issue.

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I agree with Sapan Diwakar's answer. But I have found a workaround on how to do this.

First, in your activity(e.g. activity_main), where you have all the layouts, Add a FrameLayout. It's height and width should be match parent. Also, give it an id.

Now, in your fragment which is going to replace the current layout, call onPause() and onResume(). Initialise all the all the inner containers in View. And set their visibility to ABC4 in onResume() and onResume()0.

NOTE: Not the FrameLayout which you are replacing with this fragment.

Suppose you have ViewPager, TabLayout, ImageView and a custom <fragment> in activity_main.xml. Add, a FrameLayout as mentioned above.

In abcFragment.java, in onClick() function, add addToBackstack(null) in transaction.

Example code:

in xyzFragment, which is going to replace abcFragment(and everything shown in activity_main.xml), do this

@Override
public void onResume() {
super.onResume();


// On resume, make everything in activity_main invisible except this fragment.
slidingTabs = getActivity().findViewById(R.id.sliding_tabs);
viewPager = getActivity().findViewById(R.id.pager);
miniPlayerFragment = getActivity().findViewById(R.id.mini_pager);


slidingTabs.setVisibility(View.GONE);
viewPager.setVisibility(View.GONE);
miniPlayerFragment.setVisibility(View.GONE);
}


@Override
public void onPause() {
super.onPause();


// Make everything visible again
slidingTabs = getActivity().findViewById(R.id.sliding_tabs);
viewPager = getActivity().findViewById(R.id.pager);
miniPlayerFragment = getActivity().findViewById(R.id.mini_pager);


slidingTabs.setVisibility(View.VISIBLE);
viewPager.setVisibility(View.VISIBLE);
miniPlayerFragment.setVisibility(View.VISIBLE);
}

Happy coding!

小开

Thank you to Sapan Diwakar and others. This answer helped me. I simply created a RelativeLayout without a fragment inside it, used the RelativeLayout as a parent or group view, specified that group view in the transaction to replace, and it worked.

Code:

getSupportFragmentManager().beginTransaction()
.replace(R.id.content_group_view, itemDetailFragment).commit();

XML:

 <RelativeLayout
android:id="@+id/content_group_view"
android:layout_width="match_parent"
android:layout_height="match_parent">


</RelativeLayout>
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Use a container instead of using fragment 

<FrameLayout
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Hello World!" />

Now in MainActivity 

if(condition)
getFragmentManager().beginTransaction().replace(R.id.container,new FirstFragment()).commit();
else
getFragmentManager().beginTransaction().replace(R.id.container, new SecondFragment()).commit();

Please note that your fragment class should import 'android.app.Fragment' Make sure, that you use "support.v4" or the "original" implementations and do not mix them. I was getting this problem because I had mixed them.

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You can use setTransition method from FragmentTransaction to fix overlapping issue.

transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
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I had the same problem and saw all the answers, but none of them contained my mistake! Before trying to replace the current fragment, I was showing the default fragment in the xml of the container activity like this:

<FrameLayout
android:id="@+id/fragment_frame_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">


<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="....ShopFragment"
android:id="@+id/fragment"
tools:layout="@layout/fragment_shop" />
</FrameLayout>

after that, although i was passing the FrameLayout to the fragmentTransaction.replace() but i had the exact problem. it was showing the second fragment on top of the previous one.

The problem fixed by removing the fragment from the xml and showing it programmatically in the onCreate() method of the container activity for the default preview on the start of the program like this:

    fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_frame_layout,new ShopFragment());
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();

and the container activity xml:

<FrameLayout
android:id="@+id/fragment_frame_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
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In Oncreate ()

  BaseFragmentloginpage fragment = new BaseFragmentloginpage();
android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame, fragment);
fragmentTransaction.isAddToBackStackAllowed();
fragmentTransaction.commit();

now this will be always your default fragment ...if you add fragment in xml layout it will always overlap , so set initial content with fragment at run time

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i had same problem after using this problem solved

  1. Take frame layout where u are replacing ur fragment

    <FrameLayout
android:id="@+id/fragment_place"
android:layout_width="match_parent"
android:layout_height="match_parent" />

  2. and code for replacement

    public void selectFrag(View view) {
Fragment fr;


if(view == findViewById(R.id.button2))
{
fr = new FragmentTwo();


}else {
fr = new FragmentOne();
}
FragmentManager fm = getFragmentManager();
FragmentTransaction fragmentTransaction = fm.beginTransaction();
fragmentTransaction.replace(R.id.fragment_place, fr);
fragmentTransaction.commit();

if you want whole example i will send you just comment me......

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I also had the same issue, but it was because I had not changed the background color of the fragment that I was trying add to my framelayout.

Try doing this, with layout_height and layout_width set to match_parent

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I once had this problem and found out that it was because I had accidentally deleted the android:background attribute that is missing on your xml code. I believe it works like when you're painting a wall, android:background is the color that the wall will be and the other views are placed on top of that base color. When you don't paint the wall prior to positioning your views they will be on top of what was already in that wall, in your case, your other fragment. Don't know if that will help you though, good luck.

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I have tried above all the case and try to fix the issue but still not got solution. I don't know why its not working for me. I agree with above answers because so many agree with it.

I am just extending the answer and below is the way which is working for me.

I have added this property android:clickable="true" in top parent layout on fragment.xml file.

I hope someone will get help.

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<FrameLayout
android:id="@+id/fragment_frame_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="?android:windowBackground">
//Add fragment here
</FrameLayout>

Add android:background="?android:windowBackground"> to the container in which your fragment resides. In in my case I added a FrameLayout, that should help.

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Check your frame layout ID and replace it as below

fragmentTransactionChange = MainActivity.this.getSupportFragmentManager().beginTransaction();
fragmentTransactionChange.replace(R.id.progileframe, changeFragment);
fragmentTransactionChange.addToBackStack(null);
fragmentTransactionChange.commit();

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