在Recyclerview Android中从Firebase检索日期 _recyclerview

不飞则已，一飞冲天；不鸣则已，一鸣惊人。这篇文章主要讲述在Recyclerview Android中从Firebase检索日期相关的知识，希望能为你提供帮助。
我想创建一个程序，显示Firebase实时数据库中引入的日期。目前我的程序显示的是三个字符串，这些变量是RecyclerView中的字符串。我想获取Firebase中引入的日期，然后将其与今天的日期进行比较。
我告诉你我的代码：
主要活动：

public class Documentation extends AppCompatActivity {FirebaseDatabase firebaseDatabase; FirebaseAuth mAuth; FirebaseUser user; DatabaseReference reference; RecyclerView recyclerView; ArrayList< Balloon> list; MyAdapterDoc adapterDoc; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ; recyclerView=(RecyclerView)findViewById(R.id.recycler_view); recyclerView.setLayoutManager(new LinearLayoutManager(this)); list=new ArrayList< Balloon> (); firebaseDatabase=FirebaseDatabase.getInstance(); mAuth=FirebaseAuth.getInstance(); user=mAuth.getCurrentUser(); //txt_user.setText(user.getEmail()); reference= FirebaseDatabase.getInstance().getReference().child(user.getUid()); reference.addValueEventListener(new ValueEventListener() { @Override public void onDataChange(@NonNull DataSnapshot dataSnapshot) { for(DataSnapshot dataSnapshot1:dataSnapshot.getChildren()){ Balloon b=dataSnapshot1.getValue(Balloon.class); list.add(b); } adapterDoc=new MyAdapterDoc(Documentation.this,list); recyclerView.setAdapter(adapterDoc); }@Override public void onCancelled(@NonNull DatabaseError databaseError) { Log.w("Ch3","Failed to read value.", databaseError.toException()); } }); }

MyAdapter：

public class MyAdapterDoc extends RecyclerView.Adapter< MyAdapterDoc.MyViewHolder> {Context context; ArrayList< Balloon> balloons; public MyAdapterDoc(Context c,ArrayList< Balloon> b){ context=c; balloons=b; }@NonNull @Override public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) { return new MyViewHolder(LayoutInflater.from(context).inflate(R.layout.balloon_item,viewGroup,false)); }@Override public void onBindViewHolder(@NonNull MyViewHolder myViewHolder, int i) { myViewHolder.license.setText(balloons.get(i).getLicense()); myViewHolder.cda.setText(balloons.get(i).getCda()); myViewHolder.cdm.setText(balloons.get(i).getCdm()); }@Override public int getItemCount() { return balloons.size(); }class MyViewHolder extends RecyclerView.ViewHolder{ TextView license,cdm,cda,insurance; public MyViewHolder(@NonNull View itemView){ super(itemView); license=(TextView)itemView.findViewById(R.id.txt_license); cda=(TextView)itemView.findViewById(R.id.txt_cda); cdm=(TextView)itemView.findViewById(R.id.txt_cdm); } }

}
气球课。在这段代码中，我添加了对象保险，这是一个日期，但不确定它是否正确：

public class Balloon { private String license,cda,cdm; //private boolean cda,cdm; private Date insurance; public Balloon() { }public Balloon(String license, String cda, String cdm) { this.license = license; this.cda = cda; this.cdm = cdm; this.insurance = insurance; }public String getLicense() { return license; }public void setLicense(String license) { this.license = license; }public String getCda() { return cda; }public void setCda(String cda) { this.cda = cda; }public String getCdm() { return cdm; }public void setCdm(String cdm) { this.cdm = cdm; }public Date getInsurance() { return insurance; }public void setInsurance(Date insurance) { this.insurance = insurance; }

在firebase中，我的JSON文档如下所示：here
谢谢：）
答案最好使用Date的时间戳。但是，如果您仍然使用String，那么您应该像SimpleDateFormat一样将其转换为正确的日期格式。

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd", Locale.ENGLISH); Date date = sdf.parse(insurance); //pass insurance date String here //Now compare this date to current date

另一答案