使用 FlexboxLayoutManager 将 RecyclerView 项目居中 [英] Centering RecyclerView items with FlexboxLayoutManager

问题描述

如何使用 FlexboxLayoutManager 将所有 RecyclerView 项目居中?我需要项目像这样居中:

我试过没有成功:

我设置布局管理器的代码:

val layoutManager = FlexboxLayoutManager(this)layoutManager.setFlexWrap(FlexWrap.WRAP)layoutManager.setFlexDirection(FlexDirection.ROW)layoutManager.setJustifyContent(JustifyContent.FLEX_START)layoutManager.setAlignItems(AlignItems.FLEX_START)val 适配器 = TagAdapter(tags)tagRecyclerView.adapter = 适配器tagRecyclerView.layoutManager = layoutManager

(我尝试将 layoutManager.setAlignItems(AlignItems.FLEX_START) 设置为 layoutManager.setAlignItems(AlignItems.CENTER) 但它没有用...

解决方案

试试这个

<块引用>

活动代码

public class TestActivity extends AppCompatActivity {RecyclerView recyclerView;ArrayListarrayList = 新的 ArrayList<>();FlexboxAdapter 适配器；@覆盖protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_test);recyclerView = findViewById(R.id.recyclerView);initArray();FlexboxLayoutManager layoutManager = new FlexboxLayoutManager(this);layoutManager.setFlexDirection(FlexDirection.ROW);layoutManager.setJustifyContent(JustifyContent.CENTER);layoutManager.setAlignItems(AlignItems.CENTER);recyclerView.setLayoutManager(layoutManager);适配器 = 新的 FlexboxAdapter(this, arrayList);recyclerView.setAdapter(适配器)；}私有无效initArray(){arrayList.add("Nileshfgfdgfdgfdggfgfgfdgvcb");arrayList.add("Nilesh");arrayList.add("Nilesh");arrayList.add("Nilesh");arrayList.add("Nileshfgfdgfdgfdggfgcvbcvb");arrayList.add("Nilesh");arrayList.add("Nilesh");arrayList.add("Nilesh");arrayList.add("Nileshfgfdgfdgfdggfgfdgdfgcvb");arrayList.add("Nilesh");arrayList.add("Nilesh");arrayList.add("Nilesh");arrayList.add("Nilesh");arrayList.add("Nilesh");arrayList.add("Nileshfgfdgfdgfdggfgcvb");arrayList.add("Nilesh");arrayList.add("Nilesh");arrayList.add("Nilesh");arrayList.add("Nilesh");arrayList.add("Nilesh");arrayList.add("Nilesh");arrayList.add("Nileshfgfdgfdgfdggfgdfgdfgcvb");arrayList.add("Nilesh");arrayList.add("Nilesh");arrayList.add("Nilesh");arrayList.add("Nileshfgfdgfdgfdggfgdfgcvb");arrayList.add("Nilesh");arrayList.add("Nilesh");}}

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适配器代码

public class FlexboxAdapter extends RecyclerView.Adapter{上下文上下文；ArrayListarrayList = 新的 ArrayList<>();公共 FlexboxAdapter(上下文上下文，ArrayList arrayList){this.context = 上下文；this.arrayList = arrayList;}@覆盖公共 FlexboxAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {视图视图 = LayoutInflater.from(context).inflate(R.layout.custom_layout, parent, false);返回新的 ViewHolder(view);}@覆盖public void onBindViewHolder(FlexboxAdapter.ViewHolder holder, int position) {holder.title.setText(arrayList.get(position));}@覆盖公共 int getItemCount() {返回 arrayList.size();}公共类 ViewHolder 扩展 RecyclerView.ViewHolder {文本视图标题；公共 ViewHolder(查看 itemView){超级(项目视图)；标题 = itemView.findViewById(R.id.tvTitle);}}}

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自定义布局

<文本视图android:id="@+id/tvTitle"android:layout_width="wrap_content"android:layout_height="wrap_content"机器人:layout_gravity="中心"机器人:重力=中心"机器人:填充=5dp"机器人:文本=尼罗河"android:textColor="#000"android:textSize="20sp"android:textStyle="粗体"/></LinearLayout>

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活动布局

<android.support.v7.widget.RecyclerViewandroid:id="@+id/recyclerView"android:layout_width="match_parent"android:layout_height="wrap_content"/></LinearLayout>

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输出

How do I center all my RecyclerView items using the FlexboxLayoutManager? I need the items to be centered like this:

I tried without success:

My code where I set the layout manager:

val layoutManager = FlexboxLayoutManager(this)
        layoutManager.setFlexWrap(FlexWrap.WRAP)
        layoutManager.setFlexDirection(FlexDirection.ROW)
        layoutManager.setJustifyContent(JustifyContent.FLEX_START)
        layoutManager.setAlignItems(AlignItems.FLEX_START)

        val adapter = TagAdapter(tags)
        tagRecyclerView.adapter = adapter
        tagRecyclerView.layoutManager = layoutManager

(I tried to set layoutManager.setAlignItems(AlignItems.FLEX_START) to layoutManager.setAlignItems(AlignItems.CENTER) however it did not work...

解决方案

Try this

ACTIVITY CODE

public class TestActivity extends AppCompatActivity {


    RecyclerView recyclerView;
    ArrayList<String> arrayList = new ArrayList<>();
    FlexboxAdapter adapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test);


        recyclerView = findViewById(R.id.recyclerView);
        initArray();
        FlexboxLayoutManager layoutManager = new FlexboxLayoutManager(this);
        layoutManager.setFlexDirection(FlexDirection.ROW);
        layoutManager.setJustifyContent(JustifyContent.CENTER);
        layoutManager.setAlignItems(AlignItems.CENTER);
        recyclerView.setLayoutManager(layoutManager);
        adapter = new FlexboxAdapter(this, arrayList);
        recyclerView.setAdapter(adapter);

    }

    private void initArray() {

        arrayList.add("Nileshfgfdgfdgfdggfgfgfdgvcb");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");
        arrayList.add("Nileshfgfdgfdgfdggfgcvbcvb");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");
        arrayList.add("Nileshfgfdgfdgfdggfgfdgdfgcvb");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");
        arrayList.add("Nileshfgfdgfdgfdggfgcvb");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");
        arrayList.add("Nileshfgfdgfdgfdggfgdfgdfgcvb");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");
        arrayList.add("Nileshfgfdgfdgfdggfgdfgcvb");
        arrayList.add("Nilesh");
        arrayList.add("Nilesh");


    }
}

ADAPTER CODE

public class FlexboxAdapter extends RecyclerView.Adapter<FlexboxAdapter.ViewHolder> {

    Context context;
    ArrayList<String> arrayList = new ArrayList<>();

    public FlexboxAdapter(Context context, ArrayList<String> arrayList) {
        this.context = context;
        this.arrayList = arrayList;
    }

    @Override
    public FlexboxAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.custom_layout, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(FlexboxAdapter.ViewHolder holder, int position) {

        holder.title.setText(arrayList.get(position));


    }

    @Override
    public int getItemCount() {
        return arrayList.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        TextView title;

        public ViewHolder(View itemView) {
            super(itemView);
            title = itemView.findViewById(R.id.tvTitle);
        }
    }
}

CUSTOM LAYOUT

<?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"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center">


    <TextView
        android:id="@+id/tvTitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:gravity="center"
        android:padding="5dp"
        android:text="Nilesh"
        android:textColor="#000"
        android:textSize="20sp"
        android:textStyle="bold" />

</LinearLayout>

ACTIVITY LAYOUT

<?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:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".TestActivity">

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


</LinearLayout>

OUTPUT

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