我正在开发一个博客应用程序,在那里我创建了card_view,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,除了一件事时间和日期,一切都很好。这是一件花了很多时间研究的事情,但问题是我的工作没有得到解决。
1.工作到现在的时间和日期
我的post_时间在我的POJO中很长,并成功地存储在我的数据库中
在我的博客片段中,我正在检索我的详细信息。
2.博客。JAVA
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));
}
我在跟踪了大量有关Stackoverflow的代码后完成了上述代码,但从未得到解决方案。
我的解决方案搜索:
修复日期格式上的nullpointerexception的步骤
Java日期格式的非法参数
火基。时间戳文档
与日期类一起工作
在listview中以人类可读的形式填充日期和时间
为了将时间戳格式转换为人类可读的格式,我又做了一件事,如下所示:
将时间戳格式转换为小时和日期格式
当我在博客中实现上述代码时,我在我的logcat中得到了错误。JAVA
3.LogCat
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)
W/DynamiteModule:com的本地模块描述符类。谷歌。火基。找不到身份验证。
数据库快照
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());
}
请帮助我,因为这对我来说非常重要,会让我的应用程序看起来更加用户友好。
使现代化
@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);
}
使现代化
新闻博客。JAVA
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;
}}
Blog.java
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);
}}
试试这个
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 = new Date(post_time);
} catch (ParseException e) {
e.printStackTrace();
}
time.setText(dateFormat.format(date));
}
您只需通过传入long int来创建一个日期对象
请让我知道这是否有效。
public void setPost_time(Long post_time){
TextView time = (TextView) mView.findViewById(R.id.post_time);
SimpleDateFormat sfd = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
try {
time.setText(sfd.format(new Date(post_time)));
} catch (ParseException e) {
e.printStackTrace();
}
}
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