我想在我的项目中使用FirebaseRecyclerAdapter,并在之前的Project中使用了此代码段
FirebaseRecyclerAdapter<ChatMessage,ChatMessageViewHolder> adapter = new FirebaseRecyclerAdapter<ChatMessage,ChatMessageViewHolder>(ChatMessage.class,android.R.layout.two_line_list_item,ChatMessageViewHolder.class,ref) {
public void populateViewHolder(ChatMessageViewHolder chatMessageViewHolder,ChatMessage chatMessage,int position) {
chatMessageViewHolder.nameText.setText(chatMessage.getName());
chatMessageViewHolder.messageText.setText(chatMessage.getMessage());
}
};
recycler.setAdapter(mAdapter);
并且它工作正常,但现在它不再起作用了,FirebaseUi的新版本中是否有任何更新,现在不允许我重用此代码？
我在我的项目中试过这个
@Override
protected void onStart() {
super.onStart();
FirebaseRecyclerAdapter<BlogModel,BlogListViewHolder> adapter = new FirebaseRecyclerAdapter<BlogModel,BlogListViewHolder>(BlogModel.class,BlogListViewHolder.class,mDatabaseReference) {
public void populateViewHolder(BlogListViewHolder blogListViewHolder,BlogModel blogModel,int position) {
blogListViewHolder.postTitle.setText(blogModel.getPostTitle());
blogListViewHolder.postDesc.setText(blogModel.getPostDesc());
}
};
mBlogList.setAdapter(adapter);
}
和Android Studio提供错误说你必须实现onCreateViewHolder,onBindViewHolder方法.
BlogListViewHolder类
public static class BlogListViewHolder extends RecyclerView.ViewHolder {
ImageView postImage;
TextView postTitle;
TextView postDesc;
public BlogListViewHolder(View view) {
super(view);
postImage = view.findViewById(R.id.blog_image_id);
postTitle = view.findViewById(R.id.blog_title_id);
postDesc = view.findViewById(R.id.blog_desc_id);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
}
}
我使用这个依赖项
dependencies {
compile fileTree(dir: 'libs',include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2',{
exclude group: 'com.android.support',module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:26.0.2'
compile 'com.google.firebase:firebase-auth:11.4.2'
compile 'com.google.firebase:firebase-database:11.4.2'
compile 'com.google.firebase:firebase-storage:11.4.2'
compile 'com.firebaseui:firebase-ui-database:3.1.0'
compile 'com.firebaseui:firebase-ui-firestore:3.1.0'
compile 'com.firebaseui:firebase-ui-auth:3.1.0'
compile 'com.firebaseui:firebase-ui-storage:3.1.0'
testCompile 'junit:junit:4.12'
compile 'com.squareup.picasso:picasso:2.5.2'
}
apply plugin: 'com.google.gms.google-services'
解决方法
语法已更改.概述电话的doc部分在这里：
https://github.com/firebase/FirebaseUI-Android/blob/master/database/README.md
以下是使用Firebase数据库和FirebaseUI版本的应用程序gradle文件：
// FirebaseUI for Firebase Realtime Database compile 'com.firebaseui:firebase-ui-database:3.1.0' compile 'com.google.firebase:firebase-database:11.4.2'
我定义了标准的ViewHolder和Model类.为了简洁,我会把它们留下来.
我的Fragment类顶部的实例变量：
private RecyclerView mPeopleRV; private FirebaseRecyclerAdapter<PersonModel,PeopleVH> mPeopleRVAdapter;
在我片段的onCreateView()中：
mPeopleRV = v.findViewById(R.id.peopleRV);
在我的片段的onActivityStarted()中是所有动作的所在.
onCreateViewHolder是行布局膨胀的地方.然后使用bindViewHolder()填充从Firebase获取的模型数据的行.
DatabaseReference personsRef = FirebaseDatabase.getInstance().getReference().child("People");
Query personsQuery = personsRef.orderByKey();
mPeopleRV.hasFixedSize();
mPeopleRV.setLayoutManager(new LinearLayoutManager(getActivity()));
FirebaseRecyclerOptions personsOptions = new FirebaseRecyclerOptions.Builder<PersonModel>().setQuery(personsQuery,PersonModel.class).build();
mPeopleRVAdapter = new FirebaseRecyclerAdapter<PersonModel,PeopleVH>(personsOptions) {
@Override
protected void onBindViewHolder(PeopleVH holder,int position,PersonModel model) {
holder.setPersonFirstName(model.getFirstName());
holder.setPersonLastName(model.getLastName());
}
@Override
public PeopleVH onCreateViewHolder(ViewGroup parent,int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.single_row_people_rv,parent,false);
return new PeopleVH(view);
}
};
mPeopleRV.setAdapter(mPeopleRVAdapter);
后来添加：
不要忘记在onStart()和onStop()中启动和停止适配器侦听器：
@Override
public void onStart() {
super.onStart();
mPeopleRVAdapter.startListening();
}
@Override
public void onStop() {
super.onStop();
mPeopleRVAdapter.stopListening();
}
