java - 如何以编程方式或使用 xml 属性删除回收器分隔符/分隔符

Question

我正在android v25中使用recyclerview和card view开发一个网格cardview，Android recycler view的面向行为有一条分隔线，充当两行之间的分隔符，如下图所示

我想删除这一行，我在此处附加我的布局 XMLS 和 java 代码

MainActivity.java

  @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
    categoriesAdapter = new RecyclerViewAdapter(getApplicationContext(),getAllItemList());

    recyclerView.setHasFixedSize(true);

    RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
    // set a GridLayoutManager with default vertical orientation and 3 number of columns
    GridLayoutManager gridLayoutManager = new GridLayoutManager(getApplicationContext(),3);
    recyclerView.setLayoutManager(gridLayoutManager);
    recyclerView.addItemDecoration(new DividerItemDecoration(this,  LinearLayoutManager.VERTICAL));
    recyclerView.setItemAnimator(new DefaultItemAnimator());
    recyclerView.setAdapter(categoriesAdapter);

    getAllItemList();
}

ma​​in_card_grid.xml

<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/card_view"
android:layout_width="120dp"
android:layout_height="wrap_content"
card_view:cardUseCompatPadding="true"
card_view:cardCornerRadius="2dp"
android:layout_marginBottom="16dp">

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/country_photo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"

        android:contentDescription="@string/action_settings"
        android:src="@drawable/eight"
        android:scaleType="centerCrop" />

    <TextView
        android:id="@+id/country_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="13sp"
        android:text="@string/country_name"
        android:textColor="@color/textColor"
        android:gravity="center"
        android:layout_below="@+id/country_photo"
        android:paddingBottom="4dp"
        android:paddingTop="4dp"
        android:layout_alignParentBottom="true"
        android:background="@color/white"/>

</RelativeLayout>

content_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="groups.wtz.bluewine.com.miyo.MainActivity"
    tools:showIn="@layout/app_bar_main">

    <LinearLayout 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:background="@color/white"
        android:orientation="vertical">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:padding="4dp"
            tools:context=".MainActivity">

            <android.support.v7.widget.RecyclerView
                android:id="@+id/recycler_view"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                 />

        </RelativeLayout>

    </LinearLayout>

</android.support.constraint.ConstraintLayout>

xml 的哪一部分使此下划线，我可以更新它

Answer 1

下线制造麻烦。因为您正在为您的元素添加装饰。这将为您的 View 添加分隔线。只需注释掉下面这一行即可。

recyclerView.addItemDecoration(new DividerItemDecoration(this,  LinearLayoutManager.VERTICAL));

你能提供你的DividerItemDecoration.java类吗？