我使用LinearLayoutManager来调整我的RecyclerView，当我添加mLayoutManager.setReverseLayout(true);和mLayoutManager.setStackFromEnd(true);时，情况良好。但是当我更改为GridLayoutManager时，我无法使用mLayoutManager.setStackFromEnd(true);，这会让我新添加的项目显示在底部..
无论如何都要克服这个问题吗？
以下是我的Java代码：
public class HomeActivity extends Fragment {
private RecyclerView mBlogList;
private LinearLayoutManager mLayoutManager;
private FirebaseAuth mAuth;
private DatabaseReference mDatabase;
private DatabaseReference mDatabaseLike;
private DatabaseReference mUsername;
private boolean mProcessLike = false;
Activity context;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_home, container, false);
context=getActivity();
mAuth = FirebaseAuth.getInstance();
mDatabaseLike = FirebaseDatabase.getInstance().getReferenceFromUrl("https://my-gg-app.firebaseio.com").child("Likes");
mDatabaseLike.keepSynced(true);
mUsername = FirebaseDatabase.getInstance().getReferenceFromUrl("https://my-gg-app.firebaseio.com").child("Users");
mUsername.keepSynced(true);
mDatabase = FirebaseDatabase.getInstance().getReferenceFromUrl("https://my-gg-app.firebaseio.com").child("Blog");;
mDatabase.keepSynced(true);
mBlogList = (RecyclerView)rootView.findViewById(R.id.blog_list);
mBlogList.setHasFixedSize(true);
mLayoutManager = new GridLayoutManager(context.getApplicationContext(),2);
mLayoutManager.setReverseLayout(true);
mLayoutManager.setStackFromEnd(true);
mBlogList.setLayoutManager(mLayoutManager);
FirebaseRecyclerAdapter<bLOG,BlogViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<bLOG, BlogViewHolder>(
bLOG.class,
R.layout.blog_row,
BlogViewHolder.class,
mDatabase
) {
@Override
protected void populateViewHolder(BlogViewHolder viewHolder, bLOG model, int position) {
final String post_key = getRef(position).getKey();
viewHolder.setTitle(model.getTitle());
viewHolder.setDesc(model.getDesc());
viewHolder.setUsername(model.getUsername());
viewHolder.setImage(context.getApplicationContext(),model.getImage());
viewHolder.setuserImage(context.getApplicationContext(),post_key);
viewHolder.setLikeBtn(post_key);
viewHolder.post_image.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent singleblogintent = new Intent(context, SinglePost.class);
singleblogintent.putExtra("blog_id",post_key);
startActivity(singleblogintent);
}
});
viewHolder.mLikebtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mProcessLike = true;
mDatabaseLike.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (mProcessLike) {
if (dataSnapshot.child(post_key).hasChild(mAuth.getCurrentUser().getUid())) {
mDatabaseLike.child(post_key).child(mAuth.getCurrentUser().getUid()).removeValue();
mProcessLike = false;
} else {
mDatabaseLike.child(post_key).child(mAuth.getCurrentUser().getUid()).setValue("RandomValue");
mProcessLike = false;
}
}
}
@Override
public void onCancelled (DatabaseError databaseError){
}
});
}
});
}
};
mBlogList.setAdapter(firebaseRecyclerAdapter);
return rootView;
}
public static class BlogViewHolder extends RecyclerView.ViewHolder{
View mView;
ImageButton mLikebtn;
TextView post_username;
ImageView post_image;
CircleImageView post_userimage;
DatabaseReference mDatabaseLike,mUsername;
FirebaseAuth mAuth;
public BlogViewHolder(View itemView) {
super(itemView);
mView = itemView;
post_image = (ImageView) mView.findViewById(R.id.postImage);
post_userimage = (CircleImageView) mView.findViewById(R.id.userimage);
mLikebtn = (ImageButton) mView.findViewById(R.id.likeBtn);
post_username = (TextView)mView.findViewById(R.id.postName);
post_username.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.v("MainACTIVITY", "Some Text");
}
});
mDatabaseLike = FirebaseDatabase.getInstance().getReferenceFromUrl("https://my-gg-app.firebaseio.com").child("Likes");
mDatabaseLike.keepSynced(true);
mUsername = FirebaseDatabase.getInstance().getReferenceFromUrl("https://my-gg-app.firebaseio.com").child("Users");
mUsername.keepSynced(true);
mAuth = FirebaseAuth.getInstance();
}
public void setLikeBtn(final String post_key){
mDatabaseLike.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.child(post_key).hasChild(mAuth.getCurrentUser().getUid())) {
mLikebtn.setImageResource(R.drawable.like_red);
} else {
mLikebtn.setImageResource(R.drawable.like_white);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public void setuserImage(final Context ctx, final String post_key){
mUsername.child(post_key).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
String imagedata = (String) dataSnapshot.child("image").getValue();
if (imagedata != null && imagedata.equals("default")) {
post_userimage.setImageResource(R.mipmap.profilepic);
}
else{
}
Picasso.with(ctx).load(imagedata).into(post_userimage);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public void setTitle(String title){
TextView post_title = (TextView)mView.findViewById(R.id.postTitle);
post_title.setText(title);
}
public void setDesc(String desc){
TextView post_desc = (TextView)mView.findViewById(R.id.postDescrip);
post_desc.setText(desc);
}
public void setUsername(String username){
TextView post_username = (TextView)mView.findViewById(R.id.postName);
post_username.setText(username);
}
public void setImage(Context ctx, String image){
//ImageView post_image = (ImageView)mView.findViewById(R.id.postImage);
Picasso.with(ctx).load(image).fit().centerCrop().into(post_image);
}
}