试试这个:

myrecyclerview.setLayoutManager(
        new LinearLayoutManager(getActivity(),
                                LinearLayoutManager.HORIZONTAL,false));
myrecyclerview.setAdapter(recyclerAdapter);

只是以防你有一个带有碎片的回收视图。

XML文件

<HorizontalScrollView
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    
    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal"
        android:scrollbars="vertical|horizontal" />

</HorizontalScrollView>

Code

import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.content.ContextWrapper;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;

public class MainActivity extends AppCompatActivity{

    ImageView mImageView1;
    Bitmap bitmap;
    String mSavedInfo;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mImageView1 = (ImageView) findViewById(R.id.image);
    }
    public Bitmap getBitmapFromURL(String src) {
        try {
            java.net.URL url = new java.net.URL(src);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoInput(true);
            connection.connect();
            InputStream input = connection.getInputStream();
            Bitmap myBitmap = BitmapFactory.decodeStream(input);
            return myBitmap;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }
    public void button2(View view) {
        new DownloadImageFromTherad().execute();
    }
    private class DownloadImageFromTherad extends AsyncTask<String, Integer, String> {
        @Override
        protected String doInBackground(String... params) {
            bitmap = getBitmapFromURL("https://cdn.pixabay.com/photo/2016/08/08/09/17/avatar-1577909_960_720.png");
            return null;
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            File sdCardDirectory = Environment.getExternalStorageDirectory();
            File image = new File(sdCardDirectory, "test.png");
            boolean success = false;
            FileOutputStream outStream;
            mSavedInfo = saveToInternalStorage(bitmap);
            if (success) {
                Toast.makeText(getApplicationContext(), "Image saved with success", Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(getApplicationContext(), "Error during image saving" + mSavedInfo, Toast.LENGTH_LONG).show();
            }
        }
    }
    private String saveToInternalStorage(Bitmap bitmapImage) {
        ContextWrapper cw = new ContextWrapper(getApplicationContext());
        // path to /data/data/yourapp/app_data/imageDir
        File directory = cw.getDir("imageDir", Context.MODE_PRIVATE);
        File mypath = new File(directory, "profile.jpg");
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(mypath);
            bitmapImage.compress(Bitmap.CompressFormat.PNG, 100, fos);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                fos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return directory.getAbsolutePath();
    }
    private void loadImageFromStorage(String path) {
        try {
            File f = new File(path, "profile.jpg");
            Bitmap b = BitmapFactory.decodeStream(new FileInputStream(f));
            mImageView1.setImageBitmap(b);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
    public void showImage(View view) {
        loadImageFromStorage(mSavedInfo);
    }
    
}

如果你想使用RecyclerView和GridLayoutManager，这是实现水平滚动的方法。

recyclerView.setLayoutManager(
new GridLayoutManager(recyclerView.getContext(), rows, GridLayoutManager.HORIZONTAL, false));

水平方向和垂直方向都适用。

RecyclerView recyclerView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_recycler);
    recyclerView = (RecyclerView)findViewById(R.id.recyclerViewId);

    RecyclAdapter adapter = new RecyclAdapter();

    //Vertical RecyclerView
    RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
    recyclerView.setLayoutManager(mLayoutManager);

    //Horizontal RecyclerView
    //recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext(),LinearLayoutManager.HORIZONTAL,false));

    recyclerView.setAdapter(adapter);

}

试图构建一个水平的ListView花费了太多的时间。我用两种方法解决了这个问题。

通过使用一个ViewPager，它的适配器扩展自PagerAdapter。 通过像上面一样使用RecyclerView。我们需要像下面的代码一样应用LayoutManager: LinearLayoutManager layoutManager = new LinearLayoutManager(这个，LinearLayoutManager。水平,假); RecyclerView myList = (RecyclerView) findViewById(R.id.my_recycler_view); myList.setLayoutManager (layoutManager);

有一个名为HorizontalGridView的RecyclerView子类。你可以用它来表示水平方向。 垂直方向的VerticalGridView。