那些遇到过的问题

使用RecyclerView和GridLayoutManager的简单Android网格示例(就像旧的GridView一样)

Sur*_*gch 181 android gridview gridlayoutmanager android-recyclerview

我知道,RecyclerView已经取代了旧的功能ListView和GridView.我正在寻找一个非常基本的例子,它显示了使用的最小网格设置RecyclerView.我不是在寻找长篇教程风格的解释,只是一个最小的例子.我想最简单的模仿旧GridView的网格将包含以下功能:

  • 每行多个单元格
  • 每个单元格中的单个视图
  • 响应点击事件

Sur*_*gch 453

简短的回答

对于那些已经熟悉设置RecyclerView列表的人来说,好消息是制作网格基本相同.您只需在设置时使用a GridLayoutManager而不是a .LinearLayoutManagerRecyclerView

recyclerView.setLayoutManager(new GridLayoutManager(this, numberOfColumns));
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如果您需要更多帮助,请查看以下示例.

完整的例子

以下是一个最小的示例,如下图所示.

在此输入图像描述

从空活动开始.您将执行以下任务以添加RecyclerView网格.您需要做的就是复制并粘贴每个部分中的代码.稍后您可以自定义它以满足您的需求.

  • 将依赖项添加到gradle
  • 为活动和网格单元添加xml布局文件
  • 制作RecyclerView适配器
  • 在您的活动中初始化RecyclerView

更新Gradle依赖项

确保您的app gradle.build文件中包含以下依赖项:

compile 'com.android.support:appcompat-v7:27.1.1'
compile 'com.android.support:recyclerview-v7:27.1.1'
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您可以更新的版本号无论是最新的.

创建活动布局

添加RecyclerView到您的xml布局.

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

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

</RelativeLayout>
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创建网格单元格布局

我们RecyclerView网格中的每个单元格只有一个单元格TextView.创建一个新的布局资源文件.

recyclerview_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:padding="5dp"
    android:layout_width="50dp"
    android:layout_height="50dp">

        <TextView
            android:id="@+id/info_text"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:background="@color/colorAccent"/>

</LinearLayout>
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创建适配器

将RecyclerView需要一个适配器来填充每个单元中的意见与您的数据.创建一个新的java文件.

MyRecyclerViewAdapter.java

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

    private String[] mData;
    private LayoutInflater mInflater;
    private ItemClickListener mClickListener;

    // data is passed into the constructor
    MyRecyclerViewAdapter(Context context, String[] data) {
        this.mInflater = LayoutInflater.from(context);
        this.mData = data;
    }

    // inflates the cell layout from xml when needed
    @Override
    @NonNull 
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = mInflater.inflate(R.layout.recyclerview_item, parent, false);
        return new ViewHolder(view);
    }

    // binds the data to the TextView in each cell
    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        holder.myTextView.setText(mData[position]);
    }

    // total number of cells
    @Override
    public int getItemCount() {
        return mData.length;
    }


    // stores and recycles views as they are scrolled off screen
    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        TextView myTextView;

        ViewHolder(View itemView) {
            super(itemView);
            myTextView = itemView.findViewById(R.id.info_text);
            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View view) {
            if (mClickListener != null) mClickListener.onItemClick(view, getAdapterPosition());
        }
    }

    // convenience method for getting data at click position
    String getItem(int id) {
        return mData[id];
    }

    // allows clicks events to be caught
    void setClickListener(ItemClickListener itemClickListener) {
        this.mClickListener = itemClickListener;
    }

    // parent activity will implement this method to respond to click events
    public interface ItemClickListener {
        void onItemClick(View view, int position);
    }
}
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笔记

  • 虽然不是绝对必要,但我还包括了监听单元格上的点击事件的功能.这在旧版本中是可用的GridView并且是常见的需求.如果您不需要,可以删除此代码.

在Activity中初始化RecyclerView

将以下代码添加到主活动中.

MainActivity.java

public class MainActivity extends AppCompatActivity implements MyRecyclerViewAdapter.ItemClickListener {

    MyRecyclerViewAdapter adapter;

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

        // data to populate the RecyclerView with
        String[] data = {"1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "40", "41", "42", "43", "44", "45", "46", "47", "48"};

        // set up the RecyclerView
        RecyclerView recyclerView = findViewById(R.id.rvNumbers);
        int numberOfColumns = 6;
        recyclerView.setLayoutManager(new GridLayoutManager(this, numberOfColumns));
        adapter = new MyRecyclerViewAdapter(this, data);
        adapter.setClickListener(this);
        recyclerView.setAdapter(adapter);
    }

    @Override
    public void onItemClick(View view, int position) {
        Log.i("TAG", "You clicked number " + adapter.getItem(position) + ", which is at cell position " + position);
    }
}
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笔记

  • 请注意,该活动实现了ItemClickListener我们在适配器中定义的活动.这允许我们处理单元格点击事件onItemClick.

成品

而已.您应该能够立即运行项目并获得与顶部图像类似的内容.

继续

圆角

自动拟合列

进一步研究

  • 未来的读者,让我省你一些时间,关键是`recyclerView.setLayoutManager(new GridLayoutManager(this,numberOfColumns));` (7认同)
  • @MarianPaździoch，是的，我只是举了一个最小的例子。它肯定可以使用一些美化工作。我将在以后的某个时间尝试更新此答案。 (2认同)

Ham*_*tah 16

这是仅来自 XML 的简单方法

spanCount列数

用于使其网格或线性（垂直或水平）的布局管理器

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/personListRecyclerView"
    android:layout_width="0dp"
    android:layout_height="0dp"
    app:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
    app:spanCount="2" />
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小智 9

您应该将您的设置设置RecyclerView LayoutManager为 Gridlayout 模式。当您想设置您的时，只需更改您的代码RecyclerView LayoutManager：

recyclerView.setLayoutManager(new GridLayoutManager(getActivity(), numberOfColumns));
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jon*_*era 7

虽然我喜欢并欣赏Suragch的回答,但我想留言,因为我发现编译 Adapter(MyRecyclerViewAdapter)以定义和公开Listener方法onItemClick并不是最好的方法,因为没有使用类封装正确.所以我的建议是让Adapter完全处理Listening操作(这是他的目的!)并将它们与使用Adapter(MainActivity)的Activity分开.这就是我设置Adapter类的方法:

MyRecyclerViewAdapter.java

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

    private String[] mData = new String[0];
    private LayoutInflater mInflater;

    // Data is passed into the constructor
    public MyRecyclerViewAdapter(Context context, String[] data) {
        this.mInflater = LayoutInflater.from(context);
        this.mData = data;
    }

    // Inflates the cell layout from xml when needed
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = mInflater.inflate(R.layout.recyclerview_item, parent, false);
        ViewHolder viewHolder = new ViewHolder(view);
        return viewHolder;
    }

    // Binds the data to the textview in each cell
    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        String animal = mData[position];
        holder.myTextView.setText(animal);
    }

    // Total number of cells
    @Override
    public int getItemCount() {
        return mData.length;
    }

    // Stores and recycles views as they are scrolled off screen
    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        public TextView myTextView;

        public ViewHolder(View itemView) {
            super(itemView);
            myTextView = (TextView) itemView.findViewById(R.id.info_text);
            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View view) {
            onItemClick(view, getAdapterPosition());
        }
    }

    // Convenience method for getting data at click position
    public String getItem(int id) {
        return mData[id];
    }

    // Method that executes your code for the action received
    public void onItemClick(View view, int position) {
        Log.i("TAG", "You clicked number " + getItem(position).toString() + ", which is at cell position " + position);
    }
}
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请注意onItemClick现在定义的方法MyRecyclerViewAdapter是您希望为收到的事件/操作编写任务的位置.

完成此转换只需要做一些小改动:Activity不再需要实现MyRecyclerViewAdapter.ItemClickListener,因为现在完全由适配器完成.这将是最后的修改:

MainActivity.java

public class MainActivity extends AppCompatActivity {

    MyRecyclerViewAdapter adapter;

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

        // data to populate the RecyclerView with
        String[] data = {"1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "40", "41", "42", "43", "44", "45", "46", "47", "48"};

        // set up the RecyclerView
        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.rvNumbers);
        int numberOfColumns = 6;
        recyclerView.setLayoutManager(new GridLayoutManager(this, numberOfColumns));
        adapter = new MyRecyclerViewAdapter(this, data);
        adapter.setClickListener(this);
        recyclerView.setAdapter(adapter);
    }
}
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  • 如果活动确实需要收听点击事件,该怎么办？例如,将数据传递给演示者,根据点击的项目,跟踪等做一些逻辑. (3认同)

小智 5 

    There are 2 ways to achieve this 
    
    - In Xml
     <androidx.recyclerview.widget.RecyclerView
                            android:id="@+id/list_amenities"
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_marginTop="@dimen/_8sdp"
                            android:nestedScrollingEnabled="false"                 
 app:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
                            app:spanCount="2"
app:layout_constraintEnd_toEndOf="@+id/text_parking_lot_amenities"                       app:layout_constraintStart_toStartOf="@+id/text_parking_lot_amenities"                  app:layout_constraintTop_toBottomOf="@id/text_parking_lot_amenities" />
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跨度计数用于网格列
- 在活动中

 listAmenities.layoutManager = GridLayoutManager(this, TWO)
 here TWO indicates number of grid columns
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