First Update

app/src/main/java/com/zadanie1/mw/FormPassword.java

@@ -0,0 +1,17 @@
+package com.zadanie1.mw;
+
+import android.os.Bundle;
+import android.app.Activity;
+
+public class FormPassword extends Activity {
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_form_password);
+
+
+
+
+    }
+}

app/src/main/java/com/zadanie1/mw/MainActivity.java

@@ -0,0 +1,57 @@
+package com.zadanie1.mw;
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.Manifest;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.Environment;
+import android.view.View;
+import android.widget.Button;
+import android.view.View.OnClickListener;
+import android.widget.EditText;
+import android.widget.TextView;
+
+import java.io.File;
+
+public class MainActivity extends AppCompatActivity {
+
+
+    TextView response;
+    Button button;
+    Button restartpassword;
+    private EditText textPassword;
+    private View viewPassword;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        response = (TextView) findViewById(R.id.textView);
+        button = (Button) findViewById(R.id.button);
+        restartpassword = (Button) findViewById(R.id.restartpassword);
+        textPassword = findViewById(R.id.editText);
+
+        restartpassword.setOnClickListener(new OnClickListener() {
+            public void onClick(View arg0) {
+                Intent myIntent = new Intent(MainActivity.this,
+                        FormPassword.class);
+                startActivity(myIntent);
+                finish();
+            }
+        });
+
+        button.setOnClickListener(new OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                response.setText(textPassword.getText());
+                if (textPassword.getText().toString().equals("123")) {
+                    Intent myIntent2 = new Intent(MainActivity.this,
+                            Noto.class);
+                    startActivity(myIntent2);
+                    finish();
+                }
+            }
+        });
+    }
+}

app/src/main/java/com/zadanie1/mw/Noto.java

@@ -0,0 +1,88 @@
+package com.zadanie1.mw;
+
+import androidx.appcompat.app.AppCompatActivity;
+import android.app.Activity;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedReader;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+
+public class Noto extends AppCompatActivity {
+    EditText ChangeNote;
+    Button SaveNote;
+
+    private static final String FILE_NAME = "notes.txt";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_noto);
+
+        ChangeNote = (EditText) findViewById(R.id.changeNote);
+        SaveNote = (Button) findViewById(R.id.SaveNote);
+                FileInputStream fis = null;
+
+                try {
+                    fis = openFileInput(FILE_NAME);
+                    InputStreamReader isr = new InputStreamReader(fis);
+                    BufferedReader br = new BufferedReader(isr);
+                    StringBuffer sb = new StringBuffer();
+                    String text;
+
+                    while ((text = br.readLine()) != null) {
+                        sb.append(text).append("\n");
+                    }
+
+                    if (sb.toString() != null) {
+                        ChangeNote.setText(sb.toString());
+                    }
+                } catch (FileNotFoundException e) {
+                    e.printStackTrace();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                } finally {
+                    if (fis != null){
+                        try {
+                            fis.close();
+                        } catch (IOException e) {
+                            e.printStackTrace();
+                        }
+                    }
+                }
+    }
+
+
+    public void save (View v) throws IOException {
+
+        String text = ChangeNote.getText().toString();
+        FileOutputStream fos = null;
+
+        try {
+            fos = openFileOutput(FILE_NAME, MODE_PRIVATE);
+            fos.write(text.getBytes());
+
+            ChangeNote.getText().clear();
+            Toast.makeText(this, "Saved to " + getFilesDir() + "/" + FILE_NAME, Toast.LENGTH_LONG).show();
+
+        } catch (FileNotFoundException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        } finally {
+            if (fos != null){
+                fos.close();
+            }
+        }
+    }
+}