初始化Firebase身份验证对象错误 [英] Initializing Firebase auth object error
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问题描述
这里是.java类:
package com.safariagaming.flix;
导入android.app.ProgressDialog;
导入android.support.annotation.NonNull;
导入android.support.v7.app.AppCompatActivity;
导入android.os.Bundle;
导入android.text.TextUtils;
导入android.view.View;
导入android.widget.Button;
导入android.widget.EditText;
导入android.widget.Toast;
import com.google.android.gms.tasks.OnCompleteListener;
导入com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
导入com.google.firebase.auth.FirebaseAuth;
public class SignUpScreen extends AppCompatActivity implements View.OnClickListener {
//定义视图对象
private EditText editTextEmail;
private EditText editTextPassword;
私人按钮buttonSignup;
私人ProgressDialog progressDialog;
//定义firebaseauth对象
private FirebaseAuth firebaseAuth;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sign_up_screen);
//初始化firebase auth对象
firebaseAuth = FirebaseAuth.getInstance();
//初始化视图
editTextEmail =(EditText)findViewById(R.id.editTextEmail);
editTextPassword =(EditText)findViewById(R.id.editTextPassword);
buttonSignup =(Button)findViewById(R.id.buttonSignup);
progressDialog = new ProgressDialog(this);
//将侦听器附加到按钮
buttonSignup.setOnClickListener(this);
$ b private void registerUser(){
//从编辑文本中获取电子邮件和密码
String email = editTextEmail.getText()。toString ()。修剪();
String password = editTextPassword.getText()。toString()。trim();
//检查电子邮件和密码是否为空
if(TextUtils.isEmpty(email)){
Toast.makeText(this,Please enter email,Toast.LENGTH_LONG )。显示();
return;
if(TextUtils.isEmpty(password)){
Toast.makeText(this,Please enter password,Toast.LENGTH_LONG).show();
return;
}
//如果电子邮件和密码不为空
//显示进度对话框
progressDialog.setMessage(正在注册请等待。 ..);
//创建新用户
firebaseAuth.createUserWithEmailAndPassword(email,password)
.addOnCompleteListener(this,new OnCompleteListener< AuthResult>(){
@Override
public void onComplete(@NonNull Task< AuthResult> task){
//检查是否成功
if(task.isSuccessful()){
//在这里显示一些消息
Toast.makeText(SignUpScreen.this,成功注册,Toast.LENGTH_LONG).show();
} else {
//在这里显示一些消息
Toast.makeText(SignUpScreen ();
}
progressDialog.dismiss();
}
});
$ b $
$ b @Override
public void onClick(View view){
//点击$ b $ registerEser()调用注册方法。
$ b我认为这个错误是因为我不是正确地初始化firebase auth对象)
这是我的XML类
android:paddingRight =@ dimen / activity_horizontal_margin
android:paddingTop =@ dimen / activity_vertical_margin
>
< LinearLayout
android:layout_centerVertical =true
android:layout_width =match_parent
android:layout_height =wrap_content
android:取向= 垂直 >
编辑文本
android:id =@ + id / editTextEmail
android:layout_width =match_parent
android:layout_height =wrap_content
android:layout_margin =15dp
android:hint =输入电子邮件
android:inputType =textEmailAddress/>
编辑文本
android:id =@ + id / editTextPassword
android:layout_width =match_parent
android:layout_height =wrap_content
android:layout_margin =15dp
android:hint =输入密码
android:inputType =textPassword/>
android:id =@ + id / buttonSignup
android:layout_width =match_parent
android:layout_height =wrap_content
android:layout_margin =15dp
android:text =Signup/>
< / LinearLayout>
这是我的错误讯息我正遇到
03-29 18:14:49.700 9230-9230 / com.safariagaming.flix E / AndroidRuntime:FATAL EXCEPTION :main
进程:com.safariagaming.flix,PID:9230
java.lang.NullPointerException:试图调用虚拟方法com.google.android.gms.tasks.Task com.google.firebase。 auth.FirebaseAuth.createUserWithEmailAndPassword(java.lang.String)'null对象引用
at com.safariagaming.flix.SignUpScreen.registerUser(SignUpScreen.java:72)
at com.safariagaming.flix.SignUpScreen.onClick(SignUpScreen.java:93)
在android.view.View.performClick(View.java:5637)
在android.view.View $ PerformClick.run(View.java:22429)
在android.os.Handler.handleCallback(处理程序.java:751)
在android.os.Handler.dispatchMessage(Handler.java:95)
在android.os.Looper.loop(Looper.java:154)
在android。 (Native方法)
at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit()方法)
(java.lang.reflect.Method.invoke) .java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
解决方案 您应该定义变量电子邮件
和密码
以外方法 registerUser()
。看来你的Button也没有正确设置。
package com.safariagaming.flix;
$ b / **
*导入...
* /
公共类SignUpScreen扩展AppCompatActivity实现View.OnClickListener {
private String email = null;
private String password = null;
私有FirebaseAuth.AuthStateListener mAuthListener;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sign_up_screen);
$ b / **
* Inits and code ...
* /
//监听器上的注册按钮
buttonSignup.setOnClickListener( new View.OnClickListener(){
@Override
public void onClick(View view){
email = editTextEmail.getText()。toString()。trim();
password = editTextPassword.getText()。toString()。trim();
//验证
if(TextUtils.isEmpty(email)){
Toast.makeText(LoginActivity。这个,R.string.empty_email,Toast.LENGTH_SHORT).show();
return;
}
if(!Patterns.EMAIL_ADDRESS.matcher(email).matches( )){
Toast.makeText(LoginActivity.this,R.string.wrong_email,Toast.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(password)){
Toast.makeText(LoginActivity.this,R.string.empty_password,Toast.LENGTH_SHORT).show();
}
/ /验证用户
mAuth.createUserWithEmailAndPassword(email,password)
.addOnCompleteListener(LoginActivity.this,new OnCompleteListener< AuthResult>(){
@Override $ b $ public void onComplete(@NonNull Task< ; AuthResult>任务){
if(!task.isSuccessful()){
Toast.makeText(LoginActivity.this,R.string.wrong_credentials,Toast.LENGTH_SHORT).show );
} else {
goDashboard();
finish();
}
}
});
}
});
// onStart()状态监听器
@Override
public void onStart(){
super.onStart();
mAuth.addAuthStateListener(mAuthListener);
@Override
public void onStop(){
super.onStop();
if(mAuthListener!= null){
mAuth.removeAuthStateListener(mAuthListener);
}
}
}
I am getting an error whenever I try to run the app:
Here is .java class:
package com.safariagaming.flix;
import android.app.ProgressDialog;
import android.support.annotation.NonNull;
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.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
public class SignUpScreen extends AppCompatActivity implements View.OnClickListener{
//defining view objects
private EditText editTextEmail;
private EditText editTextPassword;
private Button buttonSignup;
private ProgressDialog progressDialog;
//defining firebaseauth object
private FirebaseAuth firebaseAuth;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sign_up_screen);
//initializing firebase auth object
firebaseAuth = FirebaseAuth.getInstance();
//initializing views
editTextEmail = (EditText) findViewById(R.id.editTextEmail);
editTextPassword = (EditText) findViewById(R.id.editTextPassword);
buttonSignup = (Button) findViewById(R.id.buttonSignup);
progressDialog = new ProgressDialog(this);
//attaching listener to button
buttonSignup.setOnClickListener(this);
}
private void registerUser(){
//getting email and password from edit texts
String email = editTextEmail.getText().toString().trim();
String password = editTextPassword.getText().toString().trim();
//checking if email and passwords are empty
if(TextUtils.isEmpty(email)){
Toast.makeText(this,"Please enter email",Toast.LENGTH_LONG).show();
return;
}
if(TextUtils.isEmpty(password)){
Toast.makeText(this,"Please enter password",Toast.LENGTH_LONG).show();
return;
}
//if the email and password are not empty
//displaying a progress dialog
progressDialog.setMessage("Registering Please Wait...");
//creating a new user
firebaseAuth.createUserWithEmailAndPassword(email, password)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
//checking if success
if(task.isSuccessful()){
//display some message here
Toast.makeText(SignUpScreen.this,"Successfully registered",Toast.LENGTH_LONG).show();
}else{
//display some message here
Toast.makeText(SignUpScreen.this,"Registration Error",Toast.LENGTH_LONG).show();
}
progressDialog.dismiss();
}
});
}
@Override
public void onClick(View view) {
//calling register method on click
registerUser();
}
}
(I think that the error happens because I am not initializing firebase auth object correctly)
Here is my XML class
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
>
<LinearLayout
android:layout_centerVertical="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<EditText
android:id="@+id/editTextEmail"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="15dp"
android:hint="Enter email"
android:inputType="textEmailAddress" />
<EditText
android:id="@+id/editTextPassword"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="15dp"
android:hint="Enter password"
android:inputType="textPassword" />
<Button
android:id="@+id/buttonSignup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="15dp"
android:text="Signup" />
</LinearLayout>
Here is my error message that I am encountering
03-29 18:14:49.700 9230-9230/com.safariagaming.flix E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.safariagaming.flix, PID: 9230
java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.tasks.Task com.google.firebase.auth.FirebaseAuth.createUserWithEmailAndPassword(java.lang.String, java.lang.String)' on a null object reference
at com.safariagaming.flix.SignUpScreen.registerUser(SignUpScreen.java:72)
at com.safariagaming.flix.SignUpScreen.onClick(SignUpScreen.java:93)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
解决方案 You should have defined the variables email
and password
outside the method registerUser()
. It seems that your Button is not correctly set as well.
package com.safariagaming.flix;
/**
* Imports...
*/
public class SignUpScreen extends AppCompatActivity implements View.OnClickListener {
private String email = null;
private String password = null;
private FirebaseAuth.AuthStateListener mAuthListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sign_up_screen);
/**
* Inits and code...
*/
// Signup button on listener
buttonSignup.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
email = editTextEmail.getText().toString().trim();
password = editTextPassword.getText().toString().trim();
// Verifications
if (TextUtils.isEmpty(email)) {
Toast.makeText(LoginActivity.this, R.string.empty_email, Toast.LENGTH_SHORT).show();
return;
}
if (!Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
Toast.makeText(LoginActivity.this, R.string.wrong_email, Toast.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(password)) {
Toast.makeText(LoginActivity.this, R.string.empty_password, Toast.LENGTH_SHORT).show();
}
// Authenticating user
mAuth.createUserWithEmailAndPassword(email, password)
.addOnCompleteListener(LoginActivity.this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (!task.isSuccessful()) {
Toast.makeText(LoginActivity.this, R.string.wrong_credentials, Toast.LENGTH_SHORT).show();
} else {
goDashboard();
finish();
}
}
});
}
});
}
// onStart() state listener
@Override
public void onStart() {
super.onStart();
mAuth.addAuthStateListener(mAuthListener);
}
@Override
public void onStop() {
super.onStop();
if (mAuthListener != null) {
mAuth.removeAuthStateListener(mAuthListener);
}
}
}
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