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app/src/main/AndroidManifest.xml

@@ -10,10 +10,14 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
+        <activity
+            android:name=".NotebookActivity"
+            android:label="@string/title_activity_notebook"
+            android:theme="@style/AppTheme.NoActionBar"></activity>
         <activity
             android:name=".SetPasswordActivity"
             android:label="@string/title_activity_set_password"
-            android:theme="@style/AppTheme.NoActionBar"></activity>
+            android:theme="@style/AppTheme.NoActionBar" />
         <activity
             android:name=".MainActivity"
             android:label="@string/app_name"

app/src/main/java/com/example/encryptednotebook/NotebookActivity.java

@@ -0,0 +1,38 @@
+package com.example.encryptednotebook;
+
+import android.os.Bundle;
+
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+import com.google.android.material.snackbar.Snackbar;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.widget.Toolbar;
+
+import android.preference.PreferenceManager;
+import android.view.View;
+import android.widget.EditText;
+
+public class NotebookActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_notebook);
+        Toolbar toolbar = findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+
+        FloatingActionButton fab = findViewById(R.id.fab);
+        fab.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                EditText text = findViewById(R.id.text);
+                String textValue = text.getText().toString();
+                PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).edit().putString("TEXT", textValue).apply();
+
+                Snackbar.make(view, "Udało się zapisać", Snackbar.LENGTH_LONG)
+                        .setAction("Action", null).show();
+            }
+        });
+    }
+
+}

app/src/main/res/layout/activity_notebook.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".NotebookActivity">
+
+    <com.google.android.material.appbar.AppBarLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:theme="@style/AppTheme.AppBarOverlay">
+
+        <androidx.appcompat.widget.Toolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="?attr/actionBarSize"
+            android:background="?attr/colorPrimary"
+            app:popupTheme="@style/AppTheme.PopupOverlay" />
+
+    </com.google.android.material.appbar.AppBarLayout>
+
+    <include layout="@layout/content_notebook" />
+
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
+        android:id="@+id/fab"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="bottom|end"
+        android:layout_margin="@dimen/fab_margin"
+        app:srcCompat="@android:drawable/ic_dialog_email" />
+
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

app/src/main/res/layout/content_notebook.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    app:layout_behavior="@string/appbar_scrolling_view_behavior"
+    tools:context=".NotebookActivity"
+    tools:showIn="@layout/activity_notebook">
+
+
+    <EditText
+        android:id="@+id/text"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:ems="10"
+        android:gravity="start|top"
+        android:inputType="textMultiLine"/>
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -2,4 +2,5 @@
     <string name="app_name">Encrypted Notebook</string>
     <string name="action_settings">Settings</string>
     <string name="title_activity_set_password">SetPasswordActivity</string>
+    <string name="title_activity_notebook">NotebookActivity</string>
 </resources>