Android 以人类可读的形式在FireBaseRecyclerView适配器中填充日期和时间
我正在开发一个博客应用程序，我在其中创建了card_视图，其中显示用户名、个人资料图片、发布时间和其他详细信息。到目前为止，除了时间和日期之外，一切都很好。现在这是一件需要花费大量时间进行研究的事情，但问题是我的工作没有得到解决 1。按时间和日期工作到现在Android 以人类可读的形式在FireBaseRecyclerView适配器中填充日期和时间,android,datetime,firebase,firebase-realtime-database,Android,Datetime,Firebase,Firebase Realtime Database,我正在开发一个博客应用程序，我在其中创建了card_视图，其中显示用户名、个人资料图片、发布时间和其他详细信息。到目前为止，除了时间和日期之外，一切都很好。现在这是一件需要花费大量时间进行研究的事情，但问题是我的工作没有得到解决 1。按时间和日期工作到现在 我所做的是在时间戳中保存了用户发布时间 现在，为了实现我的目标，即以人类可读的形式检索post_时间，我做了大量研究，研究如何将数据从时间戳格式更改为非时间和年、小时格式 我的post\u时间在我的POJO中很长，并已成功存储在我的数据库
- 我所做的是在时间戳中保存了用户发布时间
- 现在，为了实现我的目标，即以人类可读的形式检索post_时间，我做了大量研究，研究如何将数据从时间戳格式更改为非时间和年、小时格式
public void setPost_time(Long post_time){
TextView time = (TextView) mView.findViewById(R.id.post_time);
DateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
Date date = null;
try {
date = dateFormat.parse(post_time.toString());
} catch (ParseException e) {
e.printStackTrace();
}
time.setText(dateFormat.format(date));
}
public class NewsBlog {
String image;
String desc;
String title;
String username;
Long post_time;
String userpic;
public NewsBlog(){
}
public NewsBlog(String image, String desc, String title, String username,
String userpic, Long post_time) {
this.image = image;
this.desc = desc;
this.title = title;
this.post_time = post_time;
this.username = username;
this.userpic = userpic;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Long getPost_time() {
return post_time;
}
public void setPost_time(Long post_time) {
this.post_time = post_time;
}
public String getUserpic() {
return userpic;
}
public void setUserpic(String userpic) {
this.userpic = userpic;
}}
public class Blog extends Fragment {
private RecyclerView mBlogList;
private DatabaseReference mDatabse,mChildRef;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private DatabaseReference mDatabaseUsers,mChildUsers;
public Blog() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_blog, container, false);
mDatabse = FirebaseDatabase.getInstance().getReference();
mChildRef = mDatabse.child("Blog");
mChildRef.keepSynced(true);
mDatabaseUsers = FirebaseDatabase.getInstance().getReference();
mChildUsers = mDatabaseUsers.child("Users");
mChildUsers.keepSynced(true);
mBlogList = (RecyclerView) view.findViewById(R.id.blog_list);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
linearLayoutManager.setReverseLayout(true);
linearLayoutManager.setStackFromEnd(true);
mBlogList.setHasFixedSize(true);
mBlogList.setLayoutManager(linearLayoutManager);
return view;
}
@Override
public void onStart() {
super.onStart();
FirebaseRecyclerAdapter<NewsBlog, BlogViewHolder> firebaseRecyclerAdapter =
new FirebaseRecyclerAdapter<NewsBlog, BlogViewHolder>(
NewsBlog.class,
R.layout.blog_row,
BlogViewHolder.class,
mChildRef) {
@Override
protected void populateViewHolder(BlogViewHolder viewHolder, NewsBlog model, int position) {
viewHolder.setTitle(model.getTitle());
viewHolder.setImage(getContext(),model.getImage());
viewHolder.setDesc(model.getDesc());
viewHolder.setUsername(model.getUsername());
viewHolder.setPost_time(model.getPost_time());
viewHolder.setUserpic(getContext(),model.getUserpic());
}
};
mBlogList.setAdapter(firebaseRecyclerAdapter);
}
public static class BlogViewHolder extends RecyclerView.ViewHolder{
View mView;
public BlogViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setTitle(String title){
TextView post_title = (TextView) mView.findViewById(R.id.post_title);
post_title.setText(title);
}
public void setImage(Context ctx, String image){
ImageView post_image = (ImageView) mView.findViewById(R.id.post_image);
Picasso.with(ctx).load(image).into(post_image);
}
public void setDesc(String desc){
TextView post_desc = (TextView) mView.findViewById(R.id.post_desc);
post_desc.setText(desc);
}
public void setUsername(String username){
TextView mUsername = (TextView) mView.findViewById(R.id.post_username);
mUsername.setText(username);
}
public void setPost_time(Long post_time){
TextView time = (TextView) mView.findViewById(R.id.post_time);
DateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
Date date = null;
try {
date = dateFormat.parse(post_time.toString());
} catch (ParseException e) {
e.printStackTrace();
}
time.setText(dateFormat.format(date));
}
public void setUserpic(Context ctx, String userpic){
ImageView userImage = (ImageView) mView.findViewById(R.id.post_userpic);
Picasso.with(ctx).load(userpic).into(userImage);
}
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.blog_menu, menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if(id == R.id.blog_items1){
//for checking whether the user has logged in or not
mAuth = FirebaseAuth.getInstance();
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
if(firebaseAuth.getCurrentUser() == null){
((AppCompatActivity)getActivity()).getSupportActionBar().setTitle("Login");
Login login = new Login();
android.support.v4.app.FragmentTransaction fragmentTransaction =
getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, login);
fragmentTransaction.commit();
} else {
((AppCompatActivity)getActivity()).getSupportActionBar().setTitle("AddBlog");
PostActivity postActivity = new PostActivity();
android.support.v4.app.FragmentTransaction fragmentTransaction =
getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, postActivity);
fragmentTransaction.commit();
}
}
};
mAuth.addAuthStateListener(mAuthListener);
mAuth.removeAuthStateListener(mAuthListener);
}else if(id == R.id.logout) {
//logout action
mAuth = FirebaseAuth.getInstance();
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
if(firebaseAuth.getCurrentUser() != null){
mAuth.signOut();
Toast.makeText(getContext()," Successfully Logged Out!",Toast.LENGTH_SHORT)
.show();
((AppCompatActivity)getActivity()).getSupportActionBar().setTitle("Login");
Login login = new Login();
android.support.v4.app.FragmentTransaction fragmentTransaction =
getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, login);
fragmentTransaction.commit();
}else{
Toast.makeText(getContext(),"Log in first!",Toast.LENGTH_SHORT)
.show();
}
}
};
mAuth.addAuthStateListener(mAuthListener);
mAuth.removeAuthStateListener(mAuthListener);
}
return super.onOptionsItemSelected(item);
}}
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.aadarshkumarsingh.project1, PID: 10460
com.google.firebase.database.DatabaseException: Failed to convert a value of type java.lang.String to long
at com.google.android.gms.internal.zzbqi.zzaA(Unknown Source)
at com.google.android.gms.internal.zzbqi.zzc(Unknown Source)
at com.google.android.gms.internal.zzbqi.zzb(Unknown Source)
at com.google.android.gms.internal.zzbqi.zza(Unknown Source)
at com.google.android.gms.internal.zzbqi.zzb(Unknown Source)
at com.google.android.gms.internal.zzbqi$zza.zze(Unknown Source)
at com.google.android.gms.internal.zzbqi$zza.zzaG(Unknown Source)
at com.google.android.gms.internal.zzbqi.zze(Unknown Source)
at com.google.android.gms.internal.zzbqi.zzb(Unknown Source)
at com.google.android.gms.internal.zzbqi.zza(Unknown Source)
at com.google.firebase.database.DataSnapshot.getValue(Unknown Source)
at com.firebase.ui.database.FirebaseRecyclerAdapter.parseSnapshot(FirebaseRecyclerAdapter.java:151)
at com.firebase.ui.database.FirebaseRecyclerAdapter.getItem(FirebaseRecyclerAdapter.java:140)
at com.firebase.ui.database.FirebaseRecyclerAdapter.onBindViewHolder(FirebaseRecyclerAdapter.java:183)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5825)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5858)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5094)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4970)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2029)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1414)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1377)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:578)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3315)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3124)
at android.support.v7.widget.RecyclerView.consumePendingUpdateOperations(RecyclerView.java:1549)
at android.support.v7.widget.RecyclerView$1.run(RecyclerView.java:305)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871)
at android.view.Choreographer.doCallbacks(Choreographer.java:683)
at android.view.Choreographer.doFrame(Choreographer.java:616)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
mDatabaseUsers.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
//now getting the title,desc and image inside the specified field in our
//databse
newPost.child("title").setValue(title_val);
newPost.child("desc").setValue(title_desc);
newPost.child("image").setValue(downloadUrl.toString());
//for future purpose if we want the app to have a feature of
//visiting the user's profile
newPost.child("uid").setValue(mCurrentUser.getUid());
newPost.child("post_time").setValue(ServerValue.TIMESTAMP);
//returns the data from the users database object
newPost.child("username").setValue(dataSnapshot.child("name").getValue());
newPost.child("userpic").setValue(dataSnapshot.child("image").getValue());
}
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.aadarshkumarsingh.project1, PID: 10460
com.google.firebase.database.DatabaseException: Failed to convert a value of type java.lang.String to long
at com.google.android.gms.internal.zzbqi.zzaA(Unknown Source)
at com.google.android.gms.internal.zzbqi.zzc(Unknown Source)
at com.google.android.gms.internal.zzbqi.zzb(Unknown Source)
at com.google.android.gms.internal.zzbqi.zza(Unknown Source)
at com.google.android.gms.internal.zzbqi.zzb(Unknown Source)
at com.google.android.gms.internal.zzbqi$zza.zze(Unknown Source)
at com.google.android.gms.internal.zzbqi$zza.zzaG(Unknown Source)
at com.google.android.gms.internal.zzbqi.zze(Unknown Source)
at com.google.android.gms.internal.zzbqi.zzb(Unknown Source)
at com.google.android.gms.internal.zzbqi.zza(Unknown Source)
at com.google.firebase.database.DataSnapshot.getValue(Unknown Source)
at com.firebase.ui.database.FirebaseRecyclerAdapter.parseSnapshot(FirebaseRecyclerAdapter.java:151)
at com.firebase.ui.database.FirebaseRecyclerAdapter.getItem(FirebaseRecyclerAdapter.java:140)
at com.firebase.ui.database.FirebaseRecyclerAdapter.onBindViewHolder(FirebaseRecyclerAdapter.java:183)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5825)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5858)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5094)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4970)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2029)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1414)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1377)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:578)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3315)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3124)
at android.support.v7.widget.RecyclerView.consumePendingUpdateOperations(RecyclerView.java:1549)
at android.support.v7.widget.RecyclerView$1.run(RecyclerView.java:305)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871)
at android.view.Choreographer.doCallbacks(Choreographer.java:683)
at android.view.Choreographer.doFrame(Choreographer.java:616)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
mDatabaseUsers.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
//now getting the title,desc and image inside the specified field in our
//databse
newPost.child("title").setValue(title_val);
newPost.child("desc").setValue(title_desc);
newPost.child("image").setValue(downloadUrl.toString());
//for future purpose if we want the app to have a feature of
//visiting the user's profile
newPost.child("uid").setValue(mCurrentUser.getUid());
newPost.child("post_time").setValue(ServerValue.TIMESTAMP);
//returns the data from the users database object
newPost.child("username").setValue(dataSnapshot.child("name").getValue());
newPost.child("userpic").setValue(dataSnapshot.child("image").getValue());
}
@Override
public void onStart() {
super.onStart();
FirebaseRecyclerAdapter<NewsBlog, BlogViewHolder> firebaseRecyclerAdapter =
new FirebaseRecyclerAdapter<NewsBlog, BlogViewHolder>(
NewsBlog.class,
R.layout.blog_row,
BlogViewHolder.class,
mChildRef) {
@Override
protected void populateViewHolder(BlogViewHolder viewHolder, NewsBlog model, int position) {
viewHolder.setTitle(model.getTitle());
viewHolder.setImage(getContext(),model.getImage());
viewHolder.setDesc(model.getDesc());
viewHolder.setUsername(model.getUsername());
viewHolder.setPost_time(model.getPost_time());
viewHolder.setUserpic(getContext(),model.getUserpic());
}
};
mBlogList.setAdapter(firebaseRecyclerAdapter);
}
public void setPost_time(Long post_time){
TextView time = (TextView) mView.findViewById(R.id.post_time);
DateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
Date date = null;
try {
date = dateFormat.parse(post_time.toString());
} catch (ParseException e) {
e.printStackTrace();
}
time.setText(dateFormat.format(date));
}
public class NewsBlog {
String image;
String desc;
String title;
String username;
Long post_time;
String userpic;
public NewsBlog(){
}
public NewsBlog(String image, String desc, String title, String username,
String userpic, Long post_time) {
this.image = image;
this.desc = desc;
this.title = title;
this.post_time = post_time;
this.username = username;
this.userpic = userpic;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Long getPost_time() {
return post_time;
}
public void setPost_time(Long post_time) {
this.post_time = post_time;
}
public String getUserpic() {
return userpic;
}
public void setUserpic(String userpic) {
this.userpic = userpic;
}}
public class Blog extends Fragment {
private RecyclerView mBlogList;
private DatabaseReference mDatabse,mChildRef;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private DatabaseReference mDatabaseUsers,mChildUsers;
public Blog() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_blog, container, false);
mDatabse = FirebaseDatabase.getInstance().getReference();
mChildRef = mDatabse.child("Blog");
mChildRef.keepSynced(true);
mDatabaseUsers = FirebaseDatabase.getInstance().getReference();
mChildUsers = mDatabaseUsers.child("Users");
mChildUsers.keepSynced(true);
mBlogList = (RecyclerView) view.findViewById(R.id.blog_list);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
linearLayoutManager.setReverseLayout(true);
linearLayoutManager.setStackFromEnd(true);
mBlogList.setHasFixedSize(true);
mBlogList.setLayoutManager(linearLayoutManager);
return view;
}
@Override
public void onStart() {
super.onStart();
FirebaseRecyclerAdapter<NewsBlog, BlogViewHolder> firebaseRecyclerAdapter =
new FirebaseRecyclerAdapter<NewsBlog, BlogViewHolder>(
NewsBlog.class,
R.layout.blog_row,
BlogViewHolder.class,
mChildRef) {
@Override
protected void populateViewHolder(BlogViewHolder viewHolder, NewsBlog model, int position) {
viewHolder.setTitle(model.getTitle());
viewHolder.setImage(getContext(),model.getImage());
viewHolder.setDesc(model.getDesc());
viewHolder.setUsername(model.getUsername());
viewHolder.setPost_time(model.getPost_time());
viewHolder.setUserpic(getContext(),model.getUserpic());
}
};
mBlogList.setAdapter(firebaseRecyclerAdapter);
}
public static class BlogViewHolder extends RecyclerView.ViewHolder{
View mView;
public BlogViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setTitle(String title){
TextView post_title = (TextView) mView.findViewById(R.id.post_title);
post_title.setText(title);
}
public void setImage(Context ctx, String image){
ImageView post_image = (ImageView) mView.findViewById(R.id.post_image);
Picasso.with(ctx).load(image).into(post_image);
}
public void setDesc(String desc){
TextView post_desc = (TextView) mView.findViewById(R.id.post_desc);
post_desc.setText(desc);
}
public void setUsername(String username){
TextView mUsername = (TextView) mView.findViewById(R.id.post_username);
mUsername.setText(username);
}
public void setPost_time(Long post_time){
TextView time = (TextView) mView.findViewById(R.id.post_time);
DateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
Date date = null;
try {
date = dateFormat.parse(post_time.toString());
} catch (ParseException e) {
e.printStackTrace();
}
time.setText(dateFormat.format(date));
}
public void setUserpic(Context ctx, String userpic){
ImageView userImage = (ImageView) mView.findViewById(R.id.post_userpic);
Picasso.with(ctx).load(userpic).into(userImage);
}
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.blog_menu, menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if(id == R.id.blog_items1){
//for checking whether the user has logged in or not
mAuth = FirebaseAuth.getInstance();
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
if(firebaseAuth.getCurrentUser() == null){
((AppCompatActivity)getActivity()).getSupportActionBar().setTitle("Login");
Login login = new Login();
android.support.v4.app.FragmentTransaction fragmentTransaction =
getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, login);
fragmentTransaction.commit();
} else {
((AppCompatActivity)getActivity()).getSupportActionBar().setTitle("AddBlog");
PostActivity postActivity = new PostActivity();
android.support.v4.app.FragmentTransaction fragmentTransaction =
getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, postActivity);
fragmentTransaction.commit();
}
}
};
mAuth.addAuthStateListener(mAuthListener);
mAuth.removeAuthStateListener(mAuthListener);
}else if(id == R.id.logout) {
//logout action
mAuth = FirebaseAuth.getInstance();
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
if(firebaseAuth.getCurrentUser() != null){
mAuth.signOut();
Toast.makeText(getContext()," Successfully Logged Out!",Toast.LENGTH_SHORT)
.show();
((AppCompatActivity)getActivity()).getSupportActionBar().setTitle("Login");
Login login = new Login();
android.support.v4.app.FragmentTransaction fragmentTransaction =
getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, login);
fragmentTransaction.commit();
}else{
Toast.makeText(getContext(),"Log in first!",Toast.LENGTH_SHORT)
.show();
}
}
};
mAuth.addAuthStateListener(mAuthListener);
mAuth.removeAuthStateListener(mAuthListener);
}
return super.onOptionsItemSelected(item);
}}
public类Blog扩展了片段{
私人回收站查看mBlogList；
私有数据库参考mDatabse，mChildRef；
私人消防队；
私有FirebaseAuth.AuthStateListener mAuthListener；
私有数据库参考mDatabaseUsers，mChildUsers；
公共博客（）{
//必需的空公共构造函数
}
@凌驾
创建视图上的公共视图（布局、充气机、视图组容器、，
Bundle savedInstanceState）{
//为该碎片膨胀布局
视图=充气机。充气（R.layout.fragment\u blog，container，false）；
mDatabse=FirebaseDatabase.getInstance（）.getReference（）；
mChildRef=mDatabse.child（“博客”）；
mChildRef.保持同步（正确）；
mDatabaseUsers=FirebaseDatabase.getInstance（）.getReference（）；
mChildUsers=mDatabaseUsers.child（“用户”）；
mChildUsers.保持同步（真）；
mBlogList=（RecyclerView）view.findviewbyd（R.id.blog_list）；
LinearLayoutManager LinearLayoutManager=新的LinearLayoutManager（getContext（））；
linearLayoutManager.setReverseLayout（true）；
linearLayoutManager.setStackFromEnd（true）；
mBlogList.setHasFixedSize（true）；
mBlogList.setLayoutManager（linearLayoutManager）；
返回视图；
}
@凌驾
public void onStart（）{
super.onStart（）；
FirebaseRecyclerAdapter FirebaseRecyclerAdapter=
新型FirebaseRecyclerAdapter(
NewsBlog.class，
R.layout.blog_行，
BlogViewHolder.class，
麦克希尔德雷夫）{
@凌驾
受保护的void populateViewHolder（BlogViewHolder、NewsBlog模型、int位置）{
setTitle（model.getTitle（））；
setImage（getContext（），model.getImage（））；
setDesc（model.getDesc（））；
viewHolder.setUsername（model.getUsername（））；
viewHolder.setPost_time（model.getPost_time（））；
setUserpic（getContext（），model.getUserpic（））；
}
};
mBlogList.setAdapter（firebaseRecyclerAdapter）；
}
公共静态类BlogViewHolder扩展了RecyclerView.ViewHolder{
视图视图；
公共BlogViewHolder（查看项目视图）{
超级（项目视图）；
mView=项目视图；
}
公共无效集合标题（字符串标题）{
TextView post_title=（TextView）mView.findViewById（R.id.post_title）；
post_title.setText（title）；
}
公共void setImage（上下文ctx，字符串图像）{
ImageView post_image=（ImageView）mView.findviewbyd（R.id.post_image）；
毕加索.with（ctx）.load（image）.into（post_image）；
}
公共void setDesc（字符串desc）{
TextView post_desc=（TextView）mView.findViewById（R.id.post_desc）；
后描述设置文本（描述）；
}
public void setUsername（字符串用户名）{
TextView mUsername=（TextView）mView.findViewById（R.id.post_用户名）；
mUsername.setText（用户名）；
}
公共无效设置post_时间（长post_时间）{
TextView时间=（TextView）mView.findviewbyd（R.id.post_时间）；
DateFormat DateFormat=新的SimpleDateFormat（“dd-MM-yyyy-HH:MM:ss”）；
日期=空；
试一试{
date=dateFormat.parse（post_time.toString（））；
}捕获（解析异常）{
e、 printStackTrace（）；
}
time.setText（dateFormat.format（date））；
}
public void setUserpic（上下文ctx，字符串userpic）{
ImageView userImage=（ImageView）mView.findviewbyd（R.id.post_userpic）；
毕加索.with（ctx）.load（userpic）.into（userImage）；
}
}
@凌驾
ActivityCreated上的公共无效（@Nullable Bundle savedinStateCState）{
super.onActivityCreated（savedInstanceState）；
设置选项菜单（真）；
}
@凌驾
创建选项菜单（菜单菜单，菜单充气机）{
充气器。充气（右菜单。右菜单，菜单）；
}
@凌驾
公共布尔值onOptionsItemSelected（菜单项项）{
int id=item.getItemId（）；
if（id==R.id.blog_items1）{
//用于检查用户是否已登录
mAuth=FirebaseAuth.getInstance（）；
mAuthListener=new FirebaseAuth.AuthStateListener（）{
@凌驾
公共空间