Java 从特定帖子的Firebase获取密钥
我在Java中仍然存在这个问题。 我的目标是输入'Likes'键,而不是图片'MauaeiPS2zQBUnto9AM'中的随机id,贴子'SqlbzURdOaNQOr5hpEg9z1oczE3020520211309',但它变得有点棘手,因为该id来自另一个活动,所以我无法'轻松地获取它。 我知道问题在于post_键,它给了我一个随机码而不是POSTID,但是我如何从firebase获得它呢 这是我来自MyAdapter.Java的代码Java 从特定帖子的Firebase获取密钥,java,android,firebase,class,post,Java,Android,Firebase,Class,Post,我在Java中仍然存在这个问题。 我的目标是输入'Likes'键,而不是图片'MauaeiPS2zQBUnto9AM'中的随机id,贴子'SqlbzURdOaNQOr5hpEg9z1oczE3020520211309',但它变得有点棘手,因为该id来自另一个活动,所以我无法'轻松地获取它。 我知道问题在于post_键,它给了我一个随机码而不是POSTID,但是我如何从firebase获得它呢 这是我来自MyAdapter.Java的代码 package com.example.scrapbas
package com.example.scrapbase11;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.google.firebase.auth.FirebaseAuth;
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.ValueEventListener;
import java.util.ArrayList;
import java.util.HashMap;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
ArrayList<Model> mList;
Context context;
public MyAdapter(Context context, ArrayList<Model> mList){
this.mList = mList;
this.context = context;
}
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(context).inflate(R.layout.item , parent , false);
return new MyViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
Model model = mList.get(position);
holder.nickname.setText(model.getNickname());
holder.date.setText(model.getDate());
holder.time.setText(model.getTime());
holder.post.setText(model.getPost());
}
@Override
public int getItemCount() {
return mList.size();
}
public static class MyViewHolder extends RecyclerView.ViewHolder{
ImageButton like;
Boolean likechecker = false;
String currentUserID;
FirebaseAuth mAuth;
TextView date, time, nickname, post, liketextview;
DatabaseReference LikesRef, PostsRef;
DatabaseReference Database = FirebaseDatabase.getInstance().getReference();
Integer countlikes;
public MyViewHolder(@NonNull View itemView) {
super(itemView);
date = itemView.findViewById(R.id.date_text);
time = itemView.findViewById(R.id.time_text);
post = itemView.findViewById(R.id.post_text);
nickname = itemView.findViewById(R.id.nickname_text);
like = itemView.findViewById(R.id.like_btn);
mAuth = FirebaseAuth.getInstance();
currentUserID = mAuth.getCurrentUser().getUid();
LikesRef = (FirebaseDatabase.getInstance().getReference().child("Likes"));
PostsRef = (FirebaseDatabase.getInstance().getReference().child("Posts"));
final String post_key = Database.push().getKey();
setlikebuttonstatus(post_key);
like.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
likechecker = true;
LikesRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
if(likechecker.equals(true)){
if (snapshot.child(post_key).hasChild(currentUserID)){
LikesRef.child(post_key).child(currentUserID).removeValue();
likechecker = false;
}
else {
LikesRef.child(post_key).child(currentUserID).setValue(true);
likechecker = false;
}
}
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
});
}
public void setlikebuttonstatus(final String post_key) {
post = itemView.findViewById(R.id.post_text);
liketextview = itemView.findViewById(R.id.like_textview);
LikesRef = (FirebaseDatabase.getInstance().getReference().child("Likes"));
mAuth = FirebaseAuth.getInstance();
currentUserID = mAuth.getCurrentUser().getUid();
LikesRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
if(snapshot.child(post_key).hasChild(currentUserID)){
countlikes = (int) snapshot.child(post_key).getChildrenCount();
like.setImageResource(R.drawable.like);
liketextview.setText(Integer.toString(countlikes) + " Likes");}
else {
countlikes = (int) snapshot.child(post_key).getChildrenCount();
like.setImageResource(R.drawable.notlike);
liketextview.setText(Integer.toString(countlikes) + " Likes");
}
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
}
}
package com.example.scrapbase11;
导入android.content.Context;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.ImageButton;
导入android.widget.TextView;
导入androidx.annotation.NonNull;
导入androidx.recyclerview.widget.recyclerview;
导入com.google.firebase.auth.FirebaseAuth;
导入com.google.firebase.database.DataSnapshot;
导入com.google.firebase.database.DatabaseError;
导入com.google.firebase.database.DatabaseReference;
导入com.google.firebase.database.FirebaseDatabase;
导入com.google.firebase.database.ValueEventListener;
导入java.util.ArrayList;
导入java.util.HashMap;
公共类MyAdapter扩展了RecyclerView.Adapter{
阵列列表;
语境;
公共MyAdapter(上下文上下文,ArrayList mList){
this.mList=mList;
this.context=上下文;
}
@非空
@凌驾
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup父级,int-viewType){
视图v=LayoutFlater.from(上下文)。充气(R.layout.item,父项,false);
返回新的MyViewHolder(v);
}
@凌驾
public void onBindViewHolder(@NonNull MyViewHolder,int位置){
Model Model=mList.get(位置);
holder.nickname.setText(model.getNickname());
holder.date.setText(model.getDate());
holder.time.setText(model.getTime());
holder.post.setText(model.getPost());
}
@凌驾
public int getItemCount(){
返回mList.size();
}
公共静态类MyViewHolder扩展了RecyclerView.ViewHolder{
图像按钮状;
布尔likechecker=false;
字符串currentUserID;
FirebaseAuth mAuth;
TextView日期、时间、昵称、帖子,如TextView;
数据库参考,如ESREF、PostsRef;
DatabaseReference Database=FirebaseDatabase.getInstance().getReference();
整数类;
公共MyViewHolder(@NonNull View itemView){
超级(项目视图);
日期=itemView.findViewById(R.id.date\u text);
时间=itemView.findViewById(R.id.time\u text);
post=itemView.findviewbyd(R.id.post\u text);
昵称=itemView.findViewById(R.id.昵称\文本);
like=itemView.findviewbyd(R.id.like_btn);
mAuth=FirebaseAuth.getInstance();
currentUserID=mAuth.getCurrentUser().getUid();
LikesRef=(FirebaseDatabase.getInstance().getReference().child(“Likes”);
PostsRef=(FirebaseDatabase.getInstance().getReference().child(“Posts”));
最后一个字符串post_key=Database.push().getKey();
setlikebuttonstatus(post_键);
like.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
likechecker=true;
像ref.addValueEventListener(新的ValueEventListener(){
@凌驾
public void onDataChange(@NonNull DataSnapshot snapshot snapshot){
如果(likechecker.equals(true)){
if(snapshot.child(post_key).hasChild(currentUserID)){
比如ref.child(post_key).child(currentUserID).removeValue();
likechecker=false;
}
否则{
比如ref.child(post_key).child(currentUserID).setValue(true);
likechecker=false;
}
}
}
@凌驾
已取消公共void(@NonNull DatabaseError){
}
});
}
});
}
public void setlikebuttonstatus(最后一个字符串后置键){
post=itemView.findviewbyd(R.id.post\u text);
liketextview=itemView.findviewbyd(R.id.like\u textview);
LikesRef=(FirebaseDatabase.getInstance().getReference().child(“Likes”);
mAuth=FirebaseAuth.getInstance();
currentUserID=mAuth.getCurrentUser().getUid();
像ref.addValueEventListener(新的ValueEventListener(){
@凌驾
public void onDataChange(@NonNull DataSnapshot snapshot snapshot){
if(snapshot.child(post_key).hasChild(currentUserID)){
countlikes=(int)snapshot.child(post_键).getChildrenCount();
like.setImageResource(R.drawable.like);
liketextview.setText(Integer.toString(countlikes)+“Likes”);}
否则{
countlikes=(int)snapshot.child(post_键).getChildrenCount();
like.setImageResource(R.drawable.notlike);
liketextview.setText(Integer.toString(countlikes)+“Likes”);
}
}
@凌驾
已取消公共void(@NonNull DatabaseError){
}
});
}
}
}