已经尝试过类似问题的所有答案，但无法解决问题，请提供此代码的指导。
我正在尝试将内容从一个活动传递到另一个活动；内容已传递，但ref.child(domain)中的change_password无法获取路径。
打包com.example.sdl;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
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;
public class MainActivity extends AppCompatActivity {
private Button Login;
EditText domain,pass,subdomain,profession,branch,rollno;
FirebaseDatabase database=FirebaseDatabase.getInstance();
public String sdomain,ssubdomain,sprofession,sbranch,srollno,spass;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Login=(Button) findViewById(R.id.Login);
domain = (EditText) findViewById((R.id.domain));
pass=(EditText)findViewById(R.id.pass);
subdomain = (EditText)findViewById(R.id.subdomain);
profession = (EditText)findViewById(R.id.profession);
branch = (EditText)findViewById(R.id.branch);
rollno = (EditText)findViewById(R.id.rollno);
Login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
openadmin();
}
});
}
public void openadmin(){
sdomain=domain.getText().toString();
ssubdomain=subdomain.getText().toString();
sprofession=profession.getText().toString();
sbranch=branch.getText().toString();
srollno=rollno.getText().toString();
spass=pass.getText().toString();
DatabaseReference ref=database.getReference().child(sdomain).child(ssubdomain).child(sprofession).child(sbranch).child(srollno);
ref.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
String saved_pass= dataSnapshot.child("password").getValue().toString();
if (sprofession.equals("admin")) {
if (saved_pass.equals(spass)) {
open_admin();
} else {
Toast.makeText(MainActivity.this, "PASSWORD IS WRONG", Toast.LENGTH_SHORT).show();
}
}
if (sprofession.equals("student")){
if (saved_pass.equals(spass)) {
open_student();
}
else{
Toast.makeText(MainActivity.this, "PASSWORD IS WRONG", Toast.LENGTH_SHORT).show();
}
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
Toast.makeText(MainActivity.this, "NO USER FOUND", Toast.LENGTH_SHORT).show();
}
});
}
public void open_admin(){
Intent login = new Intent(this, main_admin.class);
startActivity(login);
}
public void open_student(){
Intent login =new Intent(this, Student.class);
login.putExtra("domain",sdomain);
login.putExtra("subdomain",ssubdomain);
login.putExtra("profession",sprofession);
login.putExtra("branch",sbranch);
login.putExtra("rollno",srollno);
login.putExtra("pass",spass);
startActivity(login);
}
}
package com.example.sdl;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
public class Student extends AppCompatActivity {
TextView student_text;
Button change_pass;
String sdomain,ssubdomain,sprofession,sbranch,srollno,spass;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_student);
student_text= (TextView) findViewById(R.id.student_text);
change_pass=(Button) findViewById(R.id.change_pass);
Toast.makeText(this, ssubdomain, Toast.LENGTH_SHORT).show();
change_pass.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
change_pass();
}
});
}
public void change_pass(){
sdomain=getIntent().getExtras().getString("domain");
ssubdomain=getIntent().getExtras().getString("subdomain");
sprofession=getIntent().getExtras().getString("profession");
sbranch=getIntent().getExtras().getString("branch");
srollno=getIntent().getExtras().getString("rollno");
spass=getIntent().getExtras().getString("pass");
Intent change = new Intent(this,changepass.class);
change.putExtra("domain",sdomain);
change.putExtra("subdomain",ssubdomain);
change.putExtra("profession",sprofession);
change.putExtra("branch",sbranch);
change.putExtra("rollno",srollno);
change.putExtra("pass",spass);
startActivity(change);
}
}
package com.example.sdl;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import androidx.appcompat.app.AppCompatActivity;
import com.google.firebase.database.FirebaseDatabase;
public class changepass extends AppCompatActivity {
FirebaseDatabase database=FirebaseDatabase.getInstance();
EditText oldpass,newpass;
Button changepas;
String sdomain,ssubdomain,sprofession,sbranch,srollno,spass;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_changepass);
oldpass= (EditText)findViewById(R.id.oldpass);
newpass=(EditText)findViewById(R.id.newpass);
changepas= (Button) findViewById(R.id.changepas);
changepas.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
verify_change();
}
});
}
public void verify_change(){
final String voldpass=oldpass.getText().toString();
final String vnewpass=newpass.getText().toString();
sdomain=getIntent().getExtras().getString("domain");
ssubdomain=getIntent().getExtras().getString("subdomian");
sprofession=getIntent().getExtras().getString("profession");
sbranch=getIntent().getExtras().getString("branch");
srollno=getIntent().getExtras().getString("rollno");
spass=getIntent().getExtras().getString("pass");
change_password cp= new change_password(sdomain,ssubdomain,sprofession,sbranch,srollno,spass,vnewpass,voldpass);
}
}
package com.example.sdl;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
public class change_password {
FirebaseDatabase database=FirebaseDatabase.getInstance();
private String domain;
private String subdomain,profession,branch,rollno,pass,newpass,oldpass;
public change_password() {
}
public change_password( String domain, String subdomain, String profession, String branch, String rollno, String pass, String newpass, String oldpass) {
this.domain = domain;
this.subdomain = subdomain;
this.profession = profession;
this.branch = branch;
this.rollno = rollno;
this.pass = pass;
this .newpass=newpass;
this.oldpass= oldpass;
DatabaseReference ref=database.getReference();
ref.child(domain).child(subdomain).child(profession).child(branch).child(rollno).child("password").setValue(newpass);
}
public String getDomain() {
return domain;
}
public void setDomain(String domain) {
this.domain = domain;
}
public String getSubdomain() {
return subdomain;
}
public void setSubdomain(String subdomain) {
this.subdomain = subdomain;
}
public String getProfession() {
return profession;
}
public void setProfession(String profession) {
this.profession = profession;
}
public String getBranch() {
return branch;
}
public void setBranch(String branch) {
this.branch = branch;
}
public String getRollno() {
return rollno;
}
public void setRollno(String rollno) {
this.rollno = rollno;
}
public String getPass() {
return pass;
}
public void setPass(String pass) {
this.pass = pass;
}
public String getNewpass() {
return newpass;
}
public void setNewpass(String newpass) {
this.newpass = newpass;
}
public String getOldpass() {
return oldpass;
}
public void setOldpass(String oldpass) {
this.oldpass = oldpass;
}
}