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2024-04-05 10:00:05

简单的Android网格示例，使用RecyclerView和GridLayoutManager(像旧的GridView)

我知道RecyclerView已经取代了旧的ListView和GridView的功能。我正在寻找一个非常基本的例子，显示了一个最小的网格设置使用RecyclerView。我并不是在寻找冗长的教程风格的解释，只是一个简单的例子。我想象最简单的网格，模仿旧的GridView将包括以下功能:

每行多个单元格 每个单元格中的单个视图 响应点击事件

当前回答

虽然我喜欢并欣赏Suragch的回答，但我想留下一个提示，因为我发现编码适配器(MyRecyclerViewAdapter)来定义和公开监听器方法onItemClick并不是最好的方法，因为没有正确使用类封装。因此，我的建议是让适配器单独处理监听操作(这是他的目的!)，并将这些操作与使用适配器的活动(MainActivity)分开。这就是我如何设置Adapter类:

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);
    }
}

请注意，现在在MyRecyclerViewAdapter中定义的onItemClick方法是您想要为接收到的事件/操作编码任务的地方。

为了完成这个转换，只需要做一个小的更改:Activity不需要实现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);
    }
}
2017-08-21 00:23:13

其他回答

简短的回答

对于那些已经熟悉设置RecyclerView来制作列表的人来说，好消息是制作网格在很大程度上是相同的。当你设置RecyclerView时，你只是使用GridLayoutManager而不是LinearLayoutManager。

recyclerView.setLayoutManager(new GridLayoutManager(this, numberOfColumns));

如果你需要更多的帮助，那么看看下面的例子。

完整的示例

下面是一个类似下图的最小示例。

从一个空活动开始。您将执行以下任务来添加RecyclerView网格。您所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。

向gradle添加依赖项 为活动和网格单元格添加xml布局文件 制作RecyclerView适配器 初始化活动中的RecyclerView

更新Gradle依赖项

确保以下依赖项在你的应用程序gradle中。构建文件:

compile 'com.android.support:appcompat-v7:27.1.1'
compile 'com.android.support:recyclerview-v7:27.1.1'

您可以将版本号更新为最新的版本号。

创建活动布局

将RecyclerView添加到xml布局中。

activity_main.xml

<?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>

创建网格单元格布局

在我们的RecyclerView网格中的每个单元格只会有一个单一的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>

创建适配器

RecyclerView需要一个适配器来用您的数据填充每个单元格中的视图。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);
    }
}

笔记

虽然不是严格必要的，但我包含了监听单元格上的单击事件的功能。这在旧的GridView中是可用的，是一个常见的需求。如果不需要，可以删除此代码。

在Activity中初始化RecyclerView

将以下代码添加到您的主活动中。

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);
    }
}

笔记

注意，该活动实现了我们在适配器中定义的ItemClickListener。这允许我们在onItemClick中处理单元格单击事件。

完成了

就是这样。您现在应该能够运行您的项目，并获得与顶部图像类似的内容。

发生了

圆角

使用CardView

Auto-fitting列

GridLayoutManager -如何自动适合列?

进一步的研究

Android RecyclerView与GridView GridLayoutManager示例教程 Android RecyclerView网格布局示例 通过Android中的一个例子学习RecyclerView RecyclerView:带标题的网格 Android GridLayoutManager与材质设计中的RecyclerView Android上的RecyclerView和CardView

2016-11-14 11:02:32

这是一种仅使用XML的简单方法

spanCount表示列数

layoutManager使它成为网格或线性(垂直或水平)

<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"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
2020-10-14 14:07:07

虽然我喜欢并欣赏Suragch的回答，但我想留下一个提示，因为我发现编码适配器(MyRecyclerViewAdapter)来定义和公开监听器方法onItemClick并不是最好的方法，因为没有正确使用类封装。因此，我的建议是让适配器单独处理监听操作(这是他的目的!)，并将这些操作与使用适配器的活动(MainActivity)分开。这就是我如何设置Adapter类:

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);
    }
}

请注意，现在在MyRecyclerViewAdapter中定义的onItemClick方法是您想要为接收到的事件/操作编码任务的地方。

为了完成这个转换，只需要做一个小的更改:Activity不需要实现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);
    }
}
2017-08-21 00:23:13 
    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" />

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
2022-02-09 11:03:08

在MainActivity中，也就是你分配回收器视图的地方，使用这段代码。

recyclerView = findViewById(R.id.recycler_view);
    recyclerView.setHasFixedSize(true);
    //recyclerView.setLayoutManager(new LinearLayoutManager(this));
    recyclerView.setLayoutManager(new GridLayoutManager(this, 2));
2021-11-20 10:04:43

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