android - StaggeredGridLayoutManager 和移动项目

Question

我创建了一个非常简单的项目，用 recyclerview 的 StaggeredGridLayoutManager 显示 28 张图像。但是当我滚动回收 View 时，它会例如从左到右移动项目或交换左右列。

代码:

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;


public class MainActivity extends Activity {


    String mImageDir;
    private RecyclerView mRecyclerView;
    private StaggeredGridLayoutManager mLayoutManager;



    MyRecyclerAdapter myRecyclerAdapter;
    List<ImageModel> mImageList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);   
        mRecyclerView = (RecyclerView)findViewById(R.id.recyclerview_rootview);
        mLayoutManager = new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL);     
        mLayoutManager.setGapStrategy(StaggeredGridLayoutManager.GAP_HANDLING_MOVE_ITEMS_BETWEEN_SPANS);        
        mRecyclerView.setLayoutManager(mLayoutManager);
        mRecyclerView.setHasFixedSize(false);
        mImageList = new ArrayList<ImageModel>();
        for (int i = 1; i < 29 ; i++) {
            ImageModel img = new ImageModel();
            img.setTitle("Image No " + i);
            int drawableResourceId = this.getResources().getIdentifier("image"+String.valueOf(i), "drawable", this.getPackageName());
            img.setResId(drawableResourceId);
            mImageList.add(img);

        }
        myRecyclerAdapter = new MyRecyclerAdapter(MainActivity.this,mImageList);        
        mRecyclerView.setAdapter(myRecyclerAdapter);

    }

} 

还有适配器:

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


    private List<ImageModel> mItems;
    Context mContext;

    public MyRecyclerAdapter(Context context,List<ImageModel> objects) {
        mContext = context;
        mItems = objects;

    }

    static class ViewHolder extends RecyclerView.ViewHolder{
        public  ImageView mImageView;
        public  TextView mTextView;
        public View rootView;
        public ViewHolder(View itemView) {
            super(itemView);
            rootView = itemView;
            mImageView =(ImageView)itemView.findViewById(R.id.image);
            mTextView =(TextView)itemView.findViewById(R.id.title);
        }
    }

    @Override
    public int getItemCount() {

        return mItems.size();
    }

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

        ImageModel item = mItems.get(position); 
        Picasso.with(mContext).load(item.getResId()).into(holder.mImageView);
        holder.mTextView.setText(item.getTitle());
    }


    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int arg1) {
        LayoutInflater inflater =    
                (LayoutInflater) mContext.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        View convertView = inflater.inflate(R.layout.item, parent, false);
        return new ViewHolder(convertView);

    }

}

和一个移动项目示例:

http://i.imgur.com/FUapm2K.gif?1

如果你玩(上下滚动)你会发现更多有趣的动画:-)

如何防止这种情况并像普通 ListView 一样拥有稳定的布局？

编辑

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

    ImageModel item = mItems.get(position);
    RelativeLayout.LayoutParams rlp = (RelativeLayout.LayoutParams)holder.mImageView.getLayoutParams();
    float ratio = item.getHeight()/item.getWidth();
    rlp.height = (int)(rlp.width * ratio);
    holder.mImageView.setLayoutParams(rlp);
    Picasso.with(mContext).load(item.getResId()).into(holder.mImageView);
    holder.mTextView.setText(item.getTitle());
}

Answer 1

对我有用的是在使用 StaggeredGridLayoutManager 时禁用回收 View 上的所有动画。

mRecyclerView.setItemAnimator(null);

如果您只想限制移动动画并保留添加和删除项目动画，您可以创建自己的动画师。