我想要一个RecyclerView,在其中我们有垂直滚动的项目列表。从这个可滚动的项目列表中,一些人应该能够在水平方向上滚动。如下图所示
有谁能指导我怎么做吗?
谢谢。
发布于 2016-07-20 06:12:47
由于这似乎是一个常见的问题,我想我将分享我的简单实现。使用RecyclerView可以很容易地实现这一点。当使用设备相机拍摄照片时,我在尝试创建可滚动图像的水平列表时执行此操作。我已经粘贴了适配器的相关部分。
我使用的RecyclerView使用的是方向设置为水平的LinearLayoutManager。
适配器本身非常简单,并且是(请注意,这里只有相关的部分):
import android.content.Context;
import android.graphics.Bitmap;
import android.media.Image;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import com.ebay.lockers.R;
import com.ebay.lockers.utils.AsyncDrawable;
import com.ebay.lockers.utils.BitmapUtils;
import com.ebay.lockers.utils.BitmapWorkerTask;
import java.io.File;
import java.util.List;
/**
* Created by Sunil on 6/17/2016.
*/
public class ImagesHorizontalListAdapter extends RecyclerView.Adapter<ImagesHorizontalListAdapter.ImagesViewHolder> {
private Context context;
private List<File> imageFiles;
public ImagesHorizontalListAdapter(Context context, List<File> imageFiles) {
this.context = context;
this.imageFiles = imageFiles;
}
@Override
public ImagesHorizontalListAdapter.ImagesViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View layout = LayoutInflater.from(context).inflate(R.layout.simple_image_view, parent, false);
ImagesViewHolder viewHolder = new ImagesViewHolder(layout);
return viewHolder;
}
@Override
public void onBindViewHolder(final ImagesHorizontalListAdapter.ImagesViewHolder holder, final int position) {
int availableWidth = context.getResources().getDisplayMetrics().widthPixels;
int imageWidth = availableWidth/4; // Number of images to be shown by default
int imageHeight = imageWidth*4/3;
final int minDimenForScaling = Math.min(imageWidth, imageHeight);
holder.image.post(new Runnable() {
@Override
public void run() {
loadBitmap(imageFiles.get(position), holder.image, minDimenForScaling, minDimenForScaling);
}
});
}
@Override
public int getItemCount() {
return imageFiles.size();
}
public void loadBitmap(File file, ImageView imageView, int reqWidth, int reqHeight) {
if(BitmapUtils.cancelPotentialWork(file, imageView)) {
final BitmapWorkerTask task = new BitmapWorkerTask(imageView, reqWidth, reqHeight);
// The second Bitmap parameter is a placeholder image
// Should consider animation; TO DO --
final AsyncDrawable asyncDrawable = new AsyncDrawable(context.getResources(), null, task);
imageView.setImageDrawable(asyncDrawable);
task.execute(file);
}
}
public static class ImagesViewHolder extends RecyclerView.ViewHolder {
// each data item is an image
ImageView image;
public ImagesViewHolder(View layout) {
super(layout);
this.image = (ImageView) layout.findViewById(R.id.image);
}
}
}
https://stackoverflow.com/questions/31129702
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