Added login and registration integration with Firebase

app/build.gradle

@@ -25,7 +25,7 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
-    implementation 'com.google.firebase:firebase-auth:17.0.0'
+    implementation 'com.google.firebase:firebase-auth:19.1.0'
     implementation 'com.firebaseui:firebase-ui-auth:4.3.1'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test:runner:1.2.0'

app/google-services.json

@@ -1,42 +1,42 @@
 {
   "project_info": {
-    "project_number": "441201864216",
-    "firebase_url": "https://invenapp-f8264.firebaseio.com",
-    "project_id": "invenapp-f8264",
-    "storage_bucket": "invenapp-f8264.appspot.com"
+    "project_number": "457897063191",
+    "firebase_url": "https://inventory-f3c06.firebaseio.com",
+    "project_id": "inventory-f3c06",
+    "storage_bucket": "inventory-f3c06.appspot.com"
   },
   "client": [
     {
       "client_info": {
-        "mobilesdk_app_id": "1:441201864216:android:b76b311dc543976733dd6d",
+        "mobilesdk_app_id": "1:457897063191:android:91e121ab61b37fdf9c3d52",
         "android_client_info": {
           "package_name": "com.example.tablayout"
         }
       },
       "oauth_client": [
         {
-          "client_id": "441201864216-k672vcv14riolc2vl622etkce613tdqp.apps.googleusercontent.com",
+          "client_id": "457897063191-alejo8f0psmm8r3f4l55fr7hfmd8ibd5.apps.googleusercontent.com",
           "client_type": 1,
           "android_info": {
             "package_name": "com.example.tablayout",
-            "certificate_hash": "6d0edd4fb84cd8516074053e7f73361a13385a81"
+            "certificate_hash": "bdf6c94e9b3565c0417d70d717426a46effdab03"
           }
         },
         {
-          "client_id": "441201864216-ttgujha0qg7u1tm35qqhd96cl3du0jnr.apps.googleusercontent.com",
+          "client_id": "457897063191-fhd3j1gl3me9o2fkj47o9hqu5imsmvel.apps.googleusercontent.com",
           "client_type": 3
         }
       ],
       "api_key": [
         {
-          "current_key": "AIzaSyCeZws5AxIAyuvR2oVoQ82usRbz4zC8RJ4"
+          "current_key": "AIzaSyDb5lp3Z_VaGjo5BBXjrAsLk8DP4j-oni8"
         }
       ],
       "services": {
         "appinvite_service": {
           "other_platform_oauth_client": [
             {
-              "client_id": "441201864216-ttgujha0qg7u1tm35qqhd96cl3du0jnr.apps.googleusercontent.com",
+              "client_id": "457897063191-fhd3j1gl3me9o2fkj47o9hqu5imsmvel.apps.googleusercontent.com",
               "client_type": 3
             }
           ]

app/src/main/java/com/example/tablayout/Login.java

@@ -1,39 +1,122 @@
 package com.example.tablayout;
 
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 
 import android.content.Context;
 import android.content.Intent;
 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.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;
 
 
 public class Login extends AppCompatActivity {
+
+    private FirebaseAuth mAuth;
+
+    private EditText EmailField;
+    private EditText PasswordField;
+
     Button b,r;
-    Context context;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_login);
-
-        b=findViewById(R.id.logbtn);
-        r=findViewById(R.id.regbtn);
+        mAuth = FirebaseAuth.getInstance();
+        onStart();
+        EmailField = findViewById(R.id.email);
+        PasswordField = findViewById(R.id.pass);
+        b = findViewById(R.id.logbtn);
+        r = findViewById(R.id.regbtn);
         r.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
-                Intent i = new Intent(getApplicationContext() ,Register.class);
+                Intent i = new Intent(getApplicationContext(), Register.class);
                 startActivity(i);
             }
         });
 
         b.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
-                Intent i = new Intent(getApplicationContext() ,MainActivity.class);
-                startActivity(i);
+                signIn(EmailField.getText().toString(), PasswordField.getText().toString());
+
             }
         });
     }
-}
+
+        @Override
+        public void onStart() {
+            super.onStart();
+            // Check if user is signed in (non-null) and update UI accordingly.
+            FirebaseUser currentUser = mAuth.getCurrentUser();
+            if(currentUser!=null) {
+                Intent i = new Intent(getApplicationContext(), MainActivity.class);
+                startActivity(i);
+            }
+        }
+
+    private void signIn(String email, String password) {
+        if (!validateForm()) {
+            return;
+        }
+
+
+        // [START sign_in_with_email]
+        mAuth.signInWithEmailAndPassword(email, password)
+                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
+                    @Override
+                    public void onComplete(@NonNull Task<AuthResult> task) {
+                        if (task.isSuccessful()) {
+                            // Sign in success, update UI with the signed-in user's information
+                            Intent i = new Intent(getApplicationContext(), MainActivity.class);
+                            startActivity(i);
+                        } else {
+                            // If sign in fails, display a message to the user.
+
+                            Toast.makeText(Login.this, "Authentication failed.",
+                                    Toast.LENGTH_SHORT).show();
+
+
+                        }
+
+                        // [START_EXCLUDE]
+
+                    }
+                });
+        // [END sign_in_with_email]
+    }
+    private boolean validateForm() {
+        boolean valid = true;
+
+        String email = EmailField.getText().toString();
+        if (TextUtils.isEmpty(email)) {
+            EmailField.setError("Required.");
+            valid = false;
+        } else {
+            EmailField.setError(null);
+        }
+
+        String password = PasswordField.getText().toString();
+        if (TextUtils.isEmpty(password)) {
+            PasswordField.setError("Required.");
+            valid = false;
+        } else {
+            PasswordField.setError(null);
+        }
+
+        return valid;
+    }
+    }
+