jub*_*kon 1 android screen-orientation android-recyclerview
当我将屏幕方向从垂直更改为水平然后再次返回时,RecyclerView 会重新绘制并覆盖旧的(您可以在卡片视图之间看到它):
问题:如何抑制这种行为,以便 Android 始终重用最初创建的 RecyclerView?
XML 片段
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:lib="http://schemas.android.com/tools"
android:id="@+id/maschine_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="@+id/maschine_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false"
android:scrollbars="vertical"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</LinearLayout>
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主要XML
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
android:id="@+id/maschineCoordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:fitsSystemWindows="true"
xmlns:android="http://schemas.android.com/apk/res/android">
<android.support.design.widget.AppBarLayout
android:id="@+id/appBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.ActionBar">
<include
android:id="@+id/toolbar_main"
layout="@layout/toolbar"></include>
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:id="@+id/machinelistcontainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior = "@string/appbar_scrolling_view_behavior"
/>
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab_cloud_sync_maschinen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="@dimen/fab_margin"
android:backgroundTint="@color/colorPrimary"
android:src="@drawable/ic_cloud_sync_white_48dp"
app:borderWidth="0dp"
app:elevation="@dimen/fab_elevation"
app:rippleColor="#00ffff"/>
</android.support.design.widget.CoordinatorLayout>
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在您的活动的onCreate()方法中,检查该活动是否是新启动的或者是否由系统重新创建。仅当未重新创建片段时才将片段添加到其中。
@Override
protected void onCreate(Bundle savedInstanceState) {
.....
// If savedInstanceState is null, it means that the activity is freshly created
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.replace(R.id.machinelistcontainer, new MyFragment())
.commit();
}
}
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