我想用一个新的片段来替换一个旧片段,但是我仍然可以得到在新片段中仍然可见的旧片段的按钮.
FragmentTransaction transaction = getFragmentManager().beginTransaction();
Fragment newFragment = GenericMood.newInstance("a","b");
// Replace whatever is in the fragment_container view with this fragment,// and add the transaction to the back stack if needed
transaction.replace(R.id.allmoods,newFragment);
transaction.addToBackStack(null);
transaction.commitAllowingStateLoss();
我可以用新的片段替换旧的片段,但是来自R.id.allmoods片段的按钮在新的片段上仍然可见.
我试着用下面给出的代码.
FragmentTransaction transaction = getFragmentManager().beginTransaction();
Fragment newFragment = GenericMood.newInstance("a",// and add the transaction to the back stack if needed
transaction.replace(((ViewGroup)getView().getParent()).getId(),newFragment);
transaction.addToBackStack(null);
transaction.commitAllowingStateLoss();
XML文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/allmoods"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorPrimary"
tools:context="com.moodoff.Moods">
<Button
android:text="Button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="64dp"
android:id="@+id/btn_btn"
android:height="80dp"
android:width="100dp"
android:onClick="putmeoff"
android:layout_marginLeft="17dp"
android:layout_marginStart="17dp"/>
</RelativeLayout>
这是应该取代以上的片段：
<FrameLayout 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:id="@+id/genericmood"
android:layout_height="match_parent"
android:background="@color/colorPrimary"
tools:context="com.moodoff.GenericMood">
<!-- TODO: Update blank fragment layout -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#000000"
android:layout_gravity="fill_horizontal"
android:id="@+id/floatingButtons"
>
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="1dp"
android:layout_marginRight="14dp"
app:backgroundTint="#ffffff"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:src="@drawable/cameraicon"
android:id="@+id/btn_camera"
app:fabSize="mini"
/>
</RelativeLayout>
</FrameLayout>
两者都不行.该怎么办？
更新：使用适当的容器替换按钮后,新的片段未正确实例化.我得到一个纯白色的白色屏幕.
my activity_alltabs.xml looks like this:
<?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:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.moodoff.AllTabs">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/background_dark" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
解决方法
要了解片段转换的流程,首先,您必须了解其活动结构.
让我们来看看：
a)活动：在一切的底部(MainActivity)
让我们来看看：
a)活动：在一切的底部(MainActivity)
activity_main.xml： –
<RelativeLayout 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">
<FrameLayout
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
这里@ id / container是我们做的片段内容的转换的布局.
B)片段A：最初添加片段到MainActivity容器.
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
//Instance of fragment
Fragment newFragment = FragmentA.newInstance("a","b");
//It will replace the fragment content view to container of main activity
ft.replace(R.id.container,newFragment);
//FragmentA is added to back stack with it's name as a tag
ft.addToBackStack(FragmentA.class.getSimpleName());
ft.commitAllowingStateLoss();
B)片段B：用FragmentB替换片段A.
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
//Instance of fragment
Fragment newFragment = FragmentB.newInstance("a","b");
//It will replace the fragment content view to container of fragment A which // is prevIoUsly replaced to main activity container
ft.replace(R.id.container,newFragment);
//FragmentB is added to back stack with it's name as a tag
ft.addToBackStack(FragmentB.class.getSimpleName());
ft.commitAllowingStateLoss();
