add has login shared preference

android/.idea/misc.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8 (1)" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8 (1)" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">

android/app/src/main/java/com/chatman/AuthActivity.java

@@ -40,6 +40,7 @@ public class AuthActivity extends AppCompatActivity {
     private TextView switchTextView;
     private ImageView authImageView;
     private Context context;
+    private TextView authTextView;
 
 
     // activity state
@@ -48,10 +49,15 @@ public class AuthActivity extends AppCompatActivity {
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        setContentView(R.layout.activity_auth);
-        bindView();
-        switchToLogin();
-        context = this;
+        if (PreferencesHelper.getHasLogin(this)){
+            finish();
+            startActivity(new Intent(this, MainActivity.class));
+        } else {
+            setContentView(R.layout.activity_auth);
+            bindView();
+            switchToLogin();
+            context = this;
+        }
     }
 
     // bind all component view with it's xml
@@ -65,6 +71,7 @@ public class AuthActivity extends AppCompatActivity {
         registerButton = findViewById(R.id.auth_register);
         switchTextView = findViewById(R.id.auth_switch);
         authImageView = findViewById(R.id.auth_logo);
+        authTextView = findViewById(R.id.auth_word);
         Glide.with(this).load(getImage("logo")).fitCenter().into(authImageView);
     }
 
@@ -95,6 +102,8 @@ public class AuthActivity extends AppCompatActivity {
             if (user.getEmail().equals(email) && user.getPassword().equals(md5(password))) {
                 PreferencesHelper.setUserFirebaseKey(this, ds.getKey());
                 PreferencesHelper.setUserName(this, user.getName());
+                PreferencesHelper.setHasLogin(this, true);
+                finish();
                 startActivity(new Intent(this, MainActivity.class));
                 return true;
             }
@@ -149,12 +158,13 @@ public class AuthActivity extends AppCompatActivity {
                 public void onCancelled(@NonNull DatabaseError databaseError) { }
             });
 
-            if (emailUnique[0]) {
+            if (emailUnique[0] && !name.equals("") && !email.equals("") && !password.equals("") && !confirm.equals("") ) {
                 String key = FirebaseHelper.dbUser.push().getKey();
                 User user = new User(key, name, email, md5(password));
                 user.setKey(key);
                 PreferencesHelper.setUserFirebaseKey(this, key);
                 PreferencesHelper.setUserName(this, user.getName());
+                PreferencesHelper.setHasLogin(this, true);
 
                 FirebaseHelper.dbUser.child(key).setValue(user);
 
@@ -185,6 +195,7 @@ public class AuthActivity extends AppCompatActivity {
         confirmEditText.setVisibility(View.GONE);
         loginButton.setVisibility(View.VISIBLE);
         registerButton.setVisibility(View.GONE);
+        authTextView.setText(R.string.register_word);
         switchTextView.setText(getString(R.string.register));
     }
 
@@ -195,6 +206,8 @@ public class AuthActivity extends AppCompatActivity {
         loginButton.setVisibility(View.GONE);
         registerButton.setVisibility(View.VISIBLE);
         switchTextView.setText(getString(R.string.login));
+        authTextView.setText(getString(R.string.login_word));
+
     }
 
     public int getImage(String imageName) {

android/app/src/main/java/com/chatman/MainActivity.java

@@ -90,6 +90,8 @@ public class MainActivity extends AppCompatActivity
             navigationBarIntent = new Intent(MainActivity.this, AuthActivity.class);
             PreferencesHelper.setUserFirebaseKey(this, "");
             PreferencesHelper.setUserName(this,"");
+            PreferencesHelper.setHasLogin(this, false);
+
             finish();
             startActivity(navigationBarIntent);
         }

android/app/src/main/java/com/chatman/helper/PreferencesHelper.java

@@ -8,6 +8,7 @@ public class PreferencesHelper {
 
     public static final String USER_FIREBASE_KEY = "user_firebase_key";
     public static final String USER_NAME = "user_name";
+    public static final String HAS_LOGIN = "has_login";
 
     private static void setBooleanPreferences(Context context, String key, boolean value) {
         SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
@@ -62,4 +63,12 @@ public class PreferencesHelper {
     }
 
 
+    public static void setHasLogin(Context context, boolean value) {
+        setBooleanPreferences(context, HAS_LOGIN, value);
+    }
+
+    public static boolean getHasLogin(Context context) {
+        return getBooleanPreferences(context, HAS_LOGIN);
+    }
+
 }

android/app/src/main/res/values/strings.xml

@@ -15,5 +15,6 @@
     <string name="login">Masuk</string>
     <string name="register">Daftar</string>
     <string name="register_word">Belum punya akun?</string>
+    <string name="login_word">Sudah memiliki akun?</string>
 </resources>