[英]RecyclerView inside nestedscrollview with bottom sheet behavior
我正在制作一个应用程序,显示不同用户(如 facebook)的帖子活动。 我制作了 postList Activity,其中会显示用户名、他的帖子图片和帖子文本。 还想在我的应用中实现点赞和评论功能。 在评论文本视图上,底部表格将显示不同用户的评论列表。
问题是我使用了具有底表行为的嵌套滚动视图。 在nestedscroll 视图中,有recycler 视图。
这是我的底部表单的 xml 布局
<android.support.v4.widget.NestedScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/bottom_sheet1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/darker_gray"
android:fillViewport="true"
android:orientation="vertical"
app:behavior_hideable="true"
app:behavior_peekHeight="80dp"
app:layout_behavior="android.support.design.widget.BottomSheetBehavior">
<android.support.v7.widget.RecyclerView
android:id="@+id/commentList"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v4.widget.NestedScrollView>
这是帖子列表 xml
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/main_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="16dp">
<android.support.v7.widget.RecyclerView
android:id="@+id/post_list"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<android.support.design.widget.FloatingActionButton
android:id="@+id/addNewPost"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true" />
</RelativeLayout>
</ScrollView>
<include layout="@layout/bottom_sheet" />
这是 postlist 适配器
public class CustomAdapter extends RecyclerView.Adapter<ViewHolder> {
NestedScrollView bottom_sheet;
CoordinatorLayout mainLayout;
private BottomSheetBehavior mBottomSheetBehavior;
public CustomAdapter(Context context, ArrayList<Post> posts,NestedScrollView
bottom_sheet,CoordinatorLayout mainLayout) {
this.posts = posts;
this.context = context;
this.bottom_sheet=bottom_sheet;
this.mainLayout=mainLayout;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.post_layout, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
mBottomSheetBehavior = BottomSheetBehavior.from(bottom_sheet);
mBottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
@Override
public void onStateChanged(@NonNull View bottomSheet, int newState) {
switch (newState) {
case BottomSheetBehavior.STATE_HIDDEN:
break;
case BottomSheetBehavior.STATE_EXPANDED: {
}
break;
case BottomSheetBehavior.STATE_COLLAPSED: {
}
break;
case BottomSheetBehavior.STATE_DRAGGING:
break;
case BottomSheetBehavior.STATE_SETTLING:
break;
}
}
@Override
public void onSlide(@NonNull View bottomSheet, float slideOffset) {
}
});
holder.comment.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (mBottomSheetBehavior.getState() != BottomSheetBehavior.STATE_EXPANDED) {
mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
} else {
mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
}
}
});
}
@Override
public int getItemCount() {
return posts.size();
}
}
这是评论的适配器
public class CommentAdapter extends RecyclerView.Adapter<CommentViewHolder> {
Context context;
public CommentAdapter(Context context,ArrayList<Comment> comments) {
this.comments = comments;
this.context=context;
}
@Override
public CommentViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.comment_layout, parent, false);
CommentViewHolder viewHolder = new CommentViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(CommentViewHolder holder, int position) {
firebaseDatabase = FirebaseDatabase.getInstance();
commentReference = firebaseDatabase.getReference().child("Comments");
mAuth = FirebaseAuth.getInstance();
uId = mAuth.getCurrentUser().getUid();
final Comment comment = comments.get(position);
holder.commentUName.setText("Numrah");
holder.commentText.setText("hello");
holder.addCommentBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(context, "comment", Toast.LENGTH_SHORT).show();
}
});
}
@Override
public int getItemCount() {
return comments.size();
}
}
帖子列表活动
公共类 PostList 扩展 AppCompatActivity {
RecyclerView recyclerView;
ArrayList<Post> posts;
CustomAdapter customAdapter;
FloatingActionButton addPost;
FirebaseDatabase firebaseDatabase;
DatabaseReference postReference;
DatabaseReference likeReference;
DatabaseReference commentReference;
NestedScrollView bottomSheet;
CoordinatorLayout mainLayout;
private BottomSheetBehavior mBottomSheetBehavior;
RecyclerView commentRecyclerView;
ArrayList<Comment> comments;
CommentAdapter commentAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_post_list);
bottomSheet = (NestedScrollView) findViewById(R.id.bottom_sheet1);
mainLayout = (CoordinatorLayout) findViewById(R.id.main_layout);
commentRecyclerView=bottomSheet.findViewById(R.id.commentList);
comments = new ArrayList<>();
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
//layoutManager.setAutoMeasureEnabled(true);
commentRecyclerView.setLayoutManager(layoutManager);
commentRecyclerView.setNestedScrollingEnabled(false);
commentAdapter = new CommentAdapter(this, comments);
commentRecyclerView.setAdapter(commentAdapter);
firebaseDatabase = FirebaseDatabase.getInstance();
postReference = firebaseDatabase.getReference("Post");
likeReference = firebaseDatabase.getReference("Likes");
commentReference = firebaseDatabase.getReference("Comments");
posts = new ArrayList<>();
addPost = (FloatingActionButton) findViewById(R.id.addNewPost);
recyclerView = (RecyclerView) findViewById(R.id.post_list);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
customAdapter = new CustomAdapter(this, posts, bottomSheet, mainLayout);
recyclerView.setAdapter(customAdapter);
addPost.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(PostList.this, AddPost.class));
}
});
postReference.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
Post post = dataSnapshot.getValue(Post.class);
posts.add(post);
customAdapter.notifyDataSetChanged();
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
Post post = dataSnapshot.getValue(Post.class);
int indexOfItem = posts.indexOf(post);
if (indexOfItem >= 0) {
posts.set(indexOfItem, post);
}
customAdapter.notifyDataSetChanged();
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
@Override
public void onBackPressed() {
mBottomSheetBehavior = BottomSheetBehavior.from(bottomSheet);
if (mBottomSheetBehavior.getState() != BottomSheetBehavior.STATE_EXPANDED) {
super.onBackPressed();
} else {
mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
}
}
}
当你的ArrayList的comments
是空的(comments.size()为0)的getItemCount()
你的CommentAdapter
将返回0
。 因此零行将被夸大并且您的 recyclerView 将是空白的。 所以你的测试用例不会被执行要执行你的测试用例在你的CommentAdapter 中试试这个:-
@Override
public int getItemCount() {
return 5; // returning static no of items
}
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