java - Firebase 检索发布图像的日期并计算开始日期和当前日期之间的天数
问题描述
所以这是我的设计，我想要的时间的文本视图在左下角，这是我正在查看我的 x 天的地方，它在默认状态下目前它没有正常计算天数。
因此，我在检索已发布图像的日期并为每个帖子独立计算开始日期和当前日期之间的 x 天时遇到问题。
所以我试图在一个方法中获取时间戳差异日期，试图将该方法调用到另一个方法，以在我的 TextView 中设置开始日期和当前日期之间的天数差异。我尝试了几种方法，我只得到默认结果，也许我用错了？
public class PostAdapter extends RecyclerView.Adapter<PostAdapter.ImageViewHolder> {
private Context mContext;
private List<Post> mPosts;
private Post post;
private FirebaseUser firebaseUser;
public PostAdapter(Context context, List<Post> posts){
mContext = context;
mPosts = posts;
}
@NonNull
@Override
public PostAdapter.ImageViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(R.layout.post_item, parent, false);
return new PostAdapter.ImageViewHolder(view);
}
@Override
public void onBindViewHolder( final PostAdapter.ImageViewHolder holder, final int position) {
firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
final Post post = mPosts.get(position);
if(post.getPostimage() != null) {
Glide.with(mContext.getApplicationContext()).load(post.getPostimage())
.apply(new RequestOptions().placeholder(R.drawable.placeholder))
.into(holder.post_image);
}
else
{
Glide.with(mContext.getApplicationContext()).load("https://firebasestorage.googleapis.com/v0/b/araba-92732.appspot.com/o/placeholder.png?alt=media&token=b98a5c60-1ebf-4d14-bad4-b4e707c59d56")
.apply(new RequestOptions().placeholder(R.drawable.placeholder))
.into(holder.post_image);
}
if (post.getCarType() == null
&& post.getPrice() == null
&& post.getModel() == null
&& post.getDistance() == null
&& post.getColor() == null
&& post.getLocation() == null){
holder.carType2.setVisibility(View.GONE);
holder.price.setVisibility(View.GONE);
holder.model.setVisibility(View.GONE);
holder.distance.setVisibility(View.GONE);
holder.color.setVisibility(View.GONE);
holder.tvLocation.setVisibility(View.GONE);
}
else {
holder.carType2.setVisibility(View.VISIBLE);
holder.carType2.setText(post.getCarType());
holder.price.setVisibility(View.VISIBLE);
holder.price.setText(post.getPrice());
holder.model.setVisibility(View.VISIBLE);
holder.model.setText(post.getModel());
holder.distance.setVisibility(View.VISIBLE);
holder.distance.setText(post.getDistance());
holder.color.setVisibility(View.VISIBLE);
holder.color.setText(post.getColor());
holder.tvLocation.setVisibility(View.VISIBLE);
holder.tvLocation.setText(post.getLocation());
}
publisherInfo(holder.image_profile, holder.tvPublisher, post.getPublisher());
isLiked(post.getPostid(), holder.like);
isSaved(post.getPostid(), holder.save);
nrLikes(holder.likes, post.getPostid());
if(firebaseUser != null) {
holder.like.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (holder.like.getTag().equals("like")) {
FirebaseDatabase.getInstance().getReference().child("Likes").child(post.getPostid())
.child(firebaseUser.getUid()).setValue(true);
addNotification(post.getPublisher(), post.getPostid());
} else {
FirebaseDatabase.getInstance().getReference().child("Likes").child(post.getPostid())
.child(firebaseUser.getUid()).removeValue();
}
}
});
holder.save.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (holder.save.getTag().equals("save")) {
FirebaseDatabase.getInstance().getReference().child("Saves").child(firebaseUser.getUid())
.child(post.getPostid()).setValue(true);
} else {
FirebaseDatabase.getInstance().getReference().child("Saves").child(firebaseUser.getUid())
.child(post.getPostid()).removeValue();
}
}
});
}
holder.image_profile.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
SharedPreferences.Editor editor = mContext.getSharedPreferences("PREFS", MODE_PRIVATE).edit();
editor.putString("profileid", post.getPublisher());
editor.apply();
((FragmentActivity)mContext).getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new ProfileFragment()).commit();
}
});
holder.post_image.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
SharedPreferences.Editor editor = mContext.getSharedPreferences("PREFS", MODE_PRIVATE).edit();
editor.putString("postid", post.getPostid());
editor.apply();
((FragmentActivity) mContext).getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new PostDetailFragment()).commit();
}
});
holder.likes.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(mContext, FollowersActivity.class);
intent.putExtra("id", post.getPostid());
intent.putExtra("title", "likes");
mContext.startActivity(intent);
}
});
holder.more.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
PopupMenu popupMenu = new PopupMenu(mContext, view);
popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem menuItem) {
switch (menuItem.getItemId()){
case R.id.edit:
editPost(post.getPostid());
return true;
case R.id.delete:
final String id = post.getPostid();
FirebaseDatabase.getInstance().getReference("Posts")
.child(post.getPostid()).removeValue()
.addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if (task.isSuccessful()){
deleteNotifications(id, firebaseUser.getUid());
}
}
});
return true;
case R.id.report:
Toast.makeText(mContext, "Reported clicked!", Toast.LENGTH_SHORT).show();
return true;
default:
return false;
}
}
});
popupMenu.inflate(R.menu.post_menu);
if (!post.getPublisher().equals(firebaseUser.getUid())){
popupMenu.getMenu().findItem(R.id.edit).setVisible(false);
popupMenu.getMenu().findItem(R.id.delete).setVisible(false);
}
else if (post.getPublisher().equals(firebaseUser.getUid())){
popupMenu.getMenu().findItem(R.id.report).setVisible(false);
}
popupMenu.show();
}
});
}
@Override
public int getItemCount() {
return mPosts.size();
}
class ImageViewHolder extends RecyclerView.ViewHolder {
ImageView image_profile, post_image, like, save, more;
TextView carType2, likes, carType, price, model, distance, color, tvLocation, tvPublisher, iTP;
ImageViewHolder(View itemView) {
super(itemView);
image_profile = itemView.findViewById(R.id.image_profile);
carType2 = itemView.findViewById(R.id.carType2);
post_image = itemView.findViewById(R.id.post_image);
like = itemView.findViewById(R.id.like);
save = itemView.findViewById(R.id.save);
likes = itemView.findViewById(R.id.likes);
carType = itemView.findViewById(R.id.carType);
price = itemView.findViewById(R.id.price);
model = itemView.findViewById(R.id.model);
distance = itemView.findViewById(R.id.distance);
color = itemView.findViewById(R.id.color);
tvLocation = itemView.findViewById(R.id.tvLocation);
tvPublisher = itemView.findViewById(R.id.tvPublisher);
iTP = itemView.findViewById(R.id.image_time_posted);
more = itemView.findViewById(R.id.more);
}
private void setupWidgets(){
String timestampDiff = getTimestampDifference();
if(!timestampDiff.equals("0")){
iTP.setText(timestampDiff + " DAYS AGO");
}else{
iTP.setText("TODAY");
}
}
private String getTimestampDifference(){
String difference = "";
Calendar c = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.GERMAN);
sdf.setTimeZone(TimeZone.getTimeZone("German"));//google 'android list of timezones'
Date today = c.getTime();
sdf.format(today);
Date timestamp;
final String photoTimestamp = post.getPostimage();
try {
timestamp = sdf.parse(photoTimestamp);
difference = String.valueOf(Math.round(((today.getTime() - timestamp.getTime()) / 1000 / 60 / 60 / 24)));
} catch (ParseException e) {
difference = "0";
}
return difference;
}
}
这是我的主页片段，其中包含帖子的 RV
package com.capstone.araba.Fragments;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import com.capstone.araba.Adapter.PostAdapter;
import com.capstone.araba.Model.Post;
import com.capstone.araba.R;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;
import com.google.firebase.database.ValueEventListener;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Objects;
import java.util.TimeZone;
public class HomeFragment extends Fragment
{
private PostAdapter postAdapter;
private List<Post> postList;
private FirebaseUser firebaseUser;
private List<String> followingList;
private ProgressBar progress_circular;
private EditText search_bar, search_bar2;
private TextView iTP;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_home_fragment, container, false);
RecyclerView recyclerView = view.findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
LinearLayoutManager mLayoutManager = new LinearLayoutManager(getContext());
mLayoutManager.setReverseLayout(true);
mLayoutManager.setStackFromEnd(true);
recyclerView.setLayoutManager(mLayoutManager);
search_bar = view.findViewById(R.id.search_bar);
search_bar2 = view.findViewById(R.id.search_bar2);
postList = new ArrayList<>();
postAdapter = new PostAdapter(getContext(), postList);
recyclerView.setAdapter(postAdapter);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext(),
LinearLayoutManager.HORIZONTAL, false);
progress_circular = view.findViewById(R.id.progress_circular);
search_bar.clearFocus();
search_bar2.clearFocus();
checkFollowing();
readPostsSearch();
search_bar.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
searchPosts(charSequence.toString(),"carType");
}
@Override
public void afterTextChanged(Editable editable) {
}
});
search_bar2.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
searchPosts(charSequence.toString(),"location");
}
@Override
public void afterTextChanged(Editable editable) {
}
});
return view;
}
private void searchPosts(String s, String type){
final Query query = FirebaseDatabase.getInstance().getReference("Posts").orderByChild(type)
.startAt(s.toUpperCase())
.endAt(s.toLowerCase() + "\uf8ff");
query.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
postList.clear();
for (DataSnapshot snapshot : dataSnapshot.getChildren()){
Post post = snapshot.getValue(Post.class);
postList.add(post);
}
postAdapter.notifyDataSetChanged();
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
private void readPostsSearch() {
final FirebaseUser firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Posts");
reference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (search_bar.getText().toString().equals("") || search_bar2.getText().toString().equals("")) {
postList.clear();
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
Post post = snapshot.getValue(Post.class);
progress_circular.setVisibility(View.GONE);
postList.add(post);
}
postAdapter.notifyDataSetChanged();
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
private void checkFollowing(){
firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
assert firebaseUser != null;
followingList = new ArrayList<>();
if(firebaseUser != null) {
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Follow")
.child(Objects.requireNonNull(FirebaseAuth.getInstance().getCurrentUser()).getUid())
.child("following");
reference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
followingList.clear();
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
followingList.add(snapshot.getKey());
}
readPosts();
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
}
private void readPosts(){
firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Posts");
reference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
postList.clear();
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
Post post = snapshot.getValue(Post.class);
// for (String id : followingList){
// if (post.getPublisher().equals(id)){
postList.add(post);
progress_circular.setVisibility(View.GONE);
// }
// }
}
postAdapter.notifyDataSetChanged();
progress_circular.setVisibility(View.GONE);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
}
解决方案
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