【发布时间】：2018-03-11 20:30:01
【问题描述】：
Image of DB in firebase console
我真的不知道这里出了什么问题，我可以在其他活动中添加数据。我收到错误“java.lang.NullPointerException: Can't pass null for argument 'pathString' in child()”并且不知道如何解决。还创建了 3 个其他类，只有一个是向 Firebase 实时数据库存储添加数据。
package com.example.akshay.katiroll.FirstScreen;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.example.akshay.katiroll.R;
import com.example.akshay.katiroll.SecondScreen.welcome;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
public class Profile extends AppCompatActivity {
EditText fName, lName, PhNo, BDay, Zip;
Button svBtn;
DatabaseReference mDataReference;
String keyUser;
String fNameStr, lNameStr, PhNoStr, BDayStr, ZipStr;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profile);
keyUser = getIntent().getStringExtra("USER_KEY");
mDataReference = FirebaseDatabase.getInstance().getReference().child("Users").child(keyUser);//error in this line
fName = (EditText) findViewById(R.id.fName);
lName = (EditText) findViewById(R.id.lName);
PhNo = (EditText) findViewById(R.id.phno);
BDay = (EditText) findViewById(R.id.bday);
Zip = (EditText) findViewById(R.id.zip);
svBtn = (Button) findViewById(R.id.svBtn);
svBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
fNameStr = fName.getText().toString();
lNameStr = lName.getText().toString();
PhNoStr = PhNo.getText().toString();
BDayStr = BDay.getText().toString();
ZipStr = Zip.getText().toString();
if(!TextUtils.isEmpty(fNameStr) && !TextUtils.isEmpty(lNameStr) && !TextUtils.isEmpty(PhNoStr)) {
DatabaseReference mDataRef = mDataReference.child("Users").push();
mDataRef.child("firstName").setValue(""+fNameStr);
mDataRef.child("lastName").setValue(""+lNameStr);
mDataRef.child("phoneNumber").setValue(""+PhNoStr);
mDataRef.child("isVerified").setValue("verified");
if(!TextUtils.isEmpty(BDayStr)){
mDataRef.child("birthday").setValue(""+BDayStr);
}else{
mDataRef.child("birthday").setValue("null");
}
if(!TextUtils.isEmpty(ZipStr)){
mDataRef.child("zipcode").setValue("ZipStr");
}else{
mDataRef.child("zipcode").setValue("null");
}
Toast.makeText(Profile.this, "User profile added", Toast.LENGTH_LONG).show();
startActivity(new Intent(Profile.this, welcome.class));
}else{
Toast.makeText(Profile.this, "Failed to create User Account", Toast.LENGTH_LONG).show();
}
}
});
}
}
package com.example.akshay.katiroll.FirstScreen;
import android.content.Intent;
import android.graphics.Color;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.example.akshay.katiroll.R;
import com.example.akshay.katiroll.SecondScreen.welcome;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
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.ValueEventListener;
import java.util.Iterator;
public class katiRoll extends AppCompatActivity {
EditText userEdit;
EditText passEdit;
String sUser, sPass;
Button sign;
Button reg;
Boolean signInVLogIn;
FirebaseAuth mAuth;
FirebaseAuth.AuthStateListener mAuthListener;
DatabaseReference mDatabaseRef;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_kati_roll);
float Re = 255;
float Gr = 148;
float Bl = 0;
userEdit = (EditText)findViewById(R.id.user);
passEdit = (EditText)findViewById(R.id.pass);
sign = (Button) findViewById(R.id.sign);
reg = (Button) findViewById(R.id.reg);
userEdit.setTextColor(Color.rgb(Re,Gr,Bl));
passEdit.setTextColor(Color.rgb(Re,Gr,Bl));
sign.setTextColor(Color.rgb(Re,Gr,Bl));
reg.setTextColor(Color.rgb(Re,Gr,Bl));
mAuth = FirebaseAuth.getInstance();
mDatabaseRef = FirebaseDatabase.getInstance().getReference().child("Users");
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = firebaseAuth.getCurrentUser();
if(!TextUtils.isEmpty(sUser) && !TextUtils.isEmpty(sPass)){
signInVLogIn = true;
}else{
signInVLogIn = false;
}
if(user != null && signInVLogIn) {
}else{
//Toast.makeText(katiRoll.this, "Log In Failed", Toast.LENGTH_LONG).show();
}
}
};
sign.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
sUser = userEdit.getText().toString().trim();
sPass = passEdit.getText().toString().trim();
if(!TextUtils.isEmpty(sUser) && !TextUtils.isEmpty(sPass))
{
mAuth.signInWithEmailAndPassword(sUser, sPass).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if(task.isSuccessful()){
mDatabaseRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
checkUserValidation(dataSnapshot, sUser);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}else{
Toast.makeText(katiRoll.this, "User Login Doesn't Exist" , Toast.LENGTH_LONG).show();
}
}
});
}
}
});
reg.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(katiRoll.this, signUp.class));
}
});
}
private void checkUserValidation(DataSnapshot dataSnapshot, String emailForVer) {
Iterator iterator = dataSnapshot.getChildren().iterator();
while (iterator.hasNext())
{
DataSnapshot dataUser = (DataSnapshot)iterator.next();
if (dataUser.child("emailUser").getValue().toString().equals(emailForVer)){
if(dataUser.child("isVerified").getValue().toString().equals("unverified"))
{
Intent in = new Intent(katiRoll.this, Profile.class);
in.putExtra("USER KEY", dataUser.child("userKey").getValue().toString());
startActivity(in);
Log.d("USERKEY",dataUser.child("userKey").getValue().toString());
}
else{
startActivity(new Intent(katiRoll.this, welcome.class));
}
}
}
}
@Override
protected void onStart() {
super.onStart();
mAuth.addAuthStateListener(mAuthListener);
}
@Override
protected void onStop() {
super.onStop();
if(mAuthListener !=null){
mAuth.removeAuthStateListener(mAuthListener);
}
}
}
package com.example.akshay.katiroll.FirstScreen;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.InputType;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.Toast;
import com.example.akshay.katiroll.SecondScreen.welcome;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
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.example.akshay.katiroll.R;
import com.google.firebase.database.ValueEventListener;
import java.util.Iterator;
public class signUp extends AppCompatActivity {
EditText nUser, nPass;
Button registerBtn, backToMain;
ImageButton passVis;
FirebaseAuth mAuth;
FirebaseAuth.AuthStateListener mAuthListener;
DatabaseReference mDatabaseRef, mUserCheckData;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sign_up);
nUser = (EditText) findViewById(R.id.nUser);
nPass = (EditText) findViewById(R.id.nPass);
registerBtn = (Button) findViewById(R.id.registerBtn);
backToMain = (Button) findViewById(R.id.backToMain);
passVis = (ImageButton)findViewById(R.id.passVis);
passVis.setImageResource(R.drawable.open);
passVis.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Drawable drawable = passVis.getDrawable();
if(drawable.getConstantState().equals(getResources().getDrawable(R.drawable.open,null).getConstantState())){
passVis.setImageResource(R.drawable.closed);
nPass.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
}else{
passVis.setImageResource(R.drawable.open);
nPass.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_WEB_PASSWORD);
}
}
});
float Re = 255;
float Gr = 148;
float Bl = 0;
nUser.setTextColor(Color.rgb(Re, Gr, Bl));
nPass.setTextColor(Color.rgb(Re, Gr, Bl));
registerBtn.setTextColor(Color.rgb(Re, Gr, Bl));
backToMain.setTextColor(Color.rgb(Re, Gr, Bl));
mAuth = FirebaseAuth.getInstance();
mDatabaseRef = FirebaseDatabase.getInstance().getReference();
mUserCheckData = FirebaseDatabase.getInstance().getReference().child("User");
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = firebaseAuth.getCurrentUser();
if (user != null) {
final String emailForVer = user.getEmail();
mUserCheckData.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
checkForValidation(dataSnapshot, emailForVer);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
} else {
Log.d("TAG", "onAuthStateChanged:signed_out");
}
}
};
registerBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
final String nUserString, nPassString;
nUserString = (nUser.getText().toString().trim());
nPassString = (nPass.getText().toString().trim());
if(nPassString.length()>=6){
if (!TextUtils.isEmpty(nUserString) && !TextUtils.isEmpty(nPassString)) {
mAuth.createUserWithEmailAndPassword(nUserString, nPassString).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()) {
DatabaseReference mChildDatabase = mDatabaseRef.child("Users").push();
String key_user = mChildDatabase.getKey();
mChildDatabase.child("isVerified").setValue("unverified");
mChildDatabase.child("userKey").setValue(key_user);
mChildDatabase.child("EmailUser").setValue(nUserString);
mChildDatabase.child("PasswordUser").setValue(nPassString);
Toast.makeText(signUp.this, "User Account Created, Check Email For Confirmation", Toast.LENGTH_LONG).show();
FirebaseUser user = mAuth.getCurrentUser();
if (user != null) {
user.sendEmailVerification();
}
startActivity(new Intent(signUp.this, Profile.class));
} else {
Toast.makeText(signUp.this, "Failed to create User Account", Toast.LENGTH_LONG).show();
}
}
});
} else {
Toast.makeText(signUp.this, "Failed to create User Account", Toast.LENGTH_LONG).show();
}
}else {
Toast.makeText(signUp.this, "Failed to create User Account", Toast.LENGTH_LONG).show();
}
}
});
backToMain.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(signUp.this, katiRoll.class));
}
});
}
private void checkForValidation(DataSnapshot dataSnapshot, String emailForVer) {
Iterator iterator = dataSnapshot.getChildren().iterator();
while (iterator.hasNext())
{
DataSnapshot dataUser = (DataSnapshot)iterator.next();
if (dataUser.child("emailUser").getValue().toString().equals(emailForVer)){
if(dataUser.child("isVerified").getValue().toString().equals("unverified"))
{
Intent in = new Intent(signUp.this, Profile.class);
in.putExtra("USER KEY", dataUser.child("userKey").getValue().toString());
startActivity(in);
Log.d("USERKEY",dataUser.child("userKey").getValue().toString());
}
else{
startActivity(new Intent(signUp.this, welcome.class));
}
}
}
}
protected void onStart() {
super.onStart();
mAuth.addAuthStateListener(mAuthListener);
}
@Override
protected void onStop() {
super.onStop();
if(mAuthListener !=null){
mAuth.removeAuthStateListener(mAuthListener);
}
}
}
package com.example.akshay.katiroll.SecondScreen;
import android.content.Intent;
import android.graphics.Color;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import com.example.akshay.katiroll.FirstScreen.katiRoll;
import com.example.akshay.katiroll.R;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
public class welcome extends AppCompatActivity {
Button logOutBtn;
FirebaseAuth mAuth;
FirebaseAuth.AuthStateListener mAuthListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_welcome);
float Re = 255;
float Gr = 148;
float Bl = 0;
logOutBtn = (Button)findViewById(R.id.logOutBtn);
logOutBtn.setTextColor(Color.rgb(Re,Gr,Bl));
mAuth = FirebaseAuth.getInstance();
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = firebaseAuth.getCurrentUser();
if(user !=null) {
}else{
}
}
};
logOutBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mAuth.signOut();
finish();
startActivity(new Intent(welcome.this, katiRoll.class));
}
});
}
@Override
protected void onStart() {
super.onStart();
mAuth.addAuthStateListener(mAuthListener);
}
@Override
protected void onStop() {
super.onStop();
mAuth.removeAuthStateListener(mAuthListener);
}
}
【问题讨论】：
-
能否请您发布您的数据库结构？还是它的照片？
-
keyUserisnull -
发布你正在做的地方 putExtra("USER_KEY");
-
我刚刚在 katiRoll.java 和 signUp.java 文件的底部做了
-
问题出在你的getExtras，只需做一个简单的Log.e("NullCheck",""+keyUser);并检查它何时抛出错误是否为空，如果该值为 null 是因为您在 checkForValidation() 方法中将该值错误，或者您在 Profile.class 中错误，请查看下面我的答案，它可能帮助！
标签： java android firebase firebase-realtime-database