嗨,我做了一個使用Firebase的登錄/註冊系統,出於某種原因 startActivity
只是不想工作。這裏是 主要活動(LoginScreen)StartActivity不起作用
package com.example.noam.photoupload;
import android.app.ProgressDialog;
import android.content.Intent;
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.TextView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.analytics.FirebaseAnalytics;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
public class LoginScreen extends AppCompatActivity implements
View.OnClickListener {
private ProgressDialog Loading;
private FirebaseAuth mFireAuth;
private Button Registar;
private EditText Email;
private EditText Passowrd;
private Button Signin;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login_screen);
Loading= new ProgressDialog(this);
Registar=(Button) findViewById(R.id.Register);
Email=(EditText)findViewById(R.id.EditEmail);
Passowrd=(EditText)findViewById(R.id.EditPassword);
Signin=(Button)findViewById(R.id.SignInlink);
Registar.setOnClickListener(this);
Signin.setOnClickListener(this);
mFireAuth= FirebaseAuth.getInstance();
if(mFireAuth.getCurrentUser() !=null){
finish();
startActivity(new Intent(getApplicationContext(),ProfileActive.class));
}
}
private void RegistarUser(){
String email=Email.getText().toString().trim();
String password=Passowrd.getText().toString().trim();
if(TextUtils.isEmpty(email)){
//email is empty
Toast.makeText(this,"Please enter email",Toast.LENGTH_SHORT).show();
return;
}
if(TextUtils.isEmpty(password)){
//Passowrd is empty
Toast.makeText(this,"Please enter Password",Toast.LENGTH_SHORT).show();
return;
}
Loading.setMessage("Reguistering user...");
Loading.show();
mFireAuth.createUserWithEmailAndPassword(email,password)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
Loading.dismiss();
if(task.isSuccessful()){
//user is Registerd ,and login
//add my start to the next screen
finish();
startActivity(new Intent(getApplicationContext(),ProfileActive.class));
}
else{
Toast.makeText(LoginScreen.this,"failed",Toast.LENGTH_SHORT).show();
}
}
});
}
@Override
public void onClick(View view) {
if(view ==Registar){
RegistarUser();
}
if(view == Signin){
//LoginInActivity
finish();
Intent i = new Intent(LoginScreen.this, SignIn.class);
startActivity(i);
}
}
主類XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
<Button
android:layout_margin="15dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/Register"
android:text="Register User"/>
<Button
android:layout_margin="15dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Already Registered? Sign in here"
android:id="@+id/SignInlink"
android:gravity="center"/>
</LinearLayout>
</RelativeLayout>
這是第二類(重要的是說,出於某種原因,這也給了我一個錯誤:
「java.lang.NullPointerException:試圖調用虛擬方法 '空隙 android.widget.Button.setOnClickListener(android.view.View $ OnClickListener)'
上的空對象引用」)
package com.example.noam.photoupload;
import android.app.ProgressDialog;
import android.content.Intent;
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.TextView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.analytics.FirebaseAnalytics;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
public class SignIn extends AppCompatActivity implements
View.OnClickListener {
private ProgressDialog Loading;
private FirebaseAuth mFireAuth;
private Button Login;
private EditText Email;
private EditText Passoword;
private TextView SignUp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);Loading= new ProgressDialog(this);
setContentView(R.layout.activity_login_screen);
Login=(Button) findViewById(R.id.login);
Email=(EditText)findViewById(R.id.EditEmail);
Passoword=(EditText)findViewById(R.id.EditPassword);
SignUp=(TextView)findViewById(R.id.Signuplink);
mFireAuth= FirebaseAuth.getInstance();
Login.setOnClickListener(this);
SignUp.setOnClickListener(this);
;
}
private void UserLogin(){
String email=Email.getText().toString().trim();
String password=Passoword.getText().toString().trim();
if(TextUtils.isEmpty(email)){
//email is empty
Toast.makeText(this,"Please enter email",Toast.LENGTH_SHORT).show();
return;
}
if(TextUtils.isEmpty(password)){
//Passowrd is empty
Toast.makeText(this,"Please enter Password",Toast.LENGTH_SHORT).show();
return;
}
Loading.setMessage("Reguistering user...");
Loading.show();
mFireAuth.signInWithEmailAndPassword(email,password)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
Loading.dismiss();
if(task.isSuccessful()){
//user is Registerd ,and login
//add my start to the next screen
finish();
startActivity(new Intent(getApplicationContext(),ProfileActive.class));
}
else{
Toast.makeText(SignIn.this,"failed",Toast.LENGTH_SHORT).show();
}
}
});
}
@Override
public void onClick(View view) {
if(view ==Login){
UserLogin();
}
if(view == SignUp){
//LoginInActivity
finish();
startActivity(new Intent(this,LoginScreen.class));
}
}
二等XML
<Button
android:layout_margin="15dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/login"
android:text="Login"/>
<TextView
android:layout_margin="15dp"
android:onClick="onClick"
android:clickable="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Don't have an account yet ? Signup here "
android:id="@+id/Signuplink"
android:gravity="center"/>
(嘗試建議的解決方案後): 更新1: 爲了檢查問題是否在SignIn內部,並且主類(LoginScreen)沒有啓動下一個活動,並且由於某種原因,它給了我「輸入電子郵件」Toast,意味着它「刪除了」SignIn代碼如果由於某種原因進入另一個(?)但是這次應用程序沒有崩潰!
更新2: 我manged地發現,調用RegisterUser()的錯誤,並修復它,但同樣,當我點擊「SignInLink」在Loginscreen同樣的錯誤,它崩潰的應用程序是否存在同樣的代碼在SignIn類中,所以我再次決定從SignIn類中「刪除」所有代碼(只留下xml視圖的類),現在當我按下SignInLink時,它只是再次調用mainclass而不運行(也許它調用登錄屏幕但不改變按鈕的視圖?我真的不知道!)
忘了說什麼心不是工作,當我按下 「SignInlink」 按鈕,它只是不動我出於某種原因去第二班。希望它現在更清晰 – user4825345