Android Implement Edit in place (autosave)

 

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package com.example.notekeeper;

import android.content.Intent;
import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.Spinner;

import java.util.List;

public class NoteActivity extends AppCompatActivity {

    public static final String NOTE_POSITION = "com.example.notekeeper.Note_POSITION";
    public static final int POSITION_NOT_SET = -1;
    private NoteInfo mNote;
    private boolean mIsNewNote;
    private Spinner mSpinnerCourses;
    private EditText mTextNoteTitle;
    private EditText mTextNoteText;
    private int mNotePosition;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_note);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        mSpinnerCourses = findViewById(R.id.spinner_course);
        List<CourseInfo> courses = DataManager.getInstance().getCourses();
        ArrayAdapter<CourseInfo> adapterCourses =
                new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, courses);
        adapterCourses.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        mSpinnerCourses.setAdapter(adapterCourses);

        readDisplayStateValues();

        mTextNoteTitle = findViewById(R.id.text_note_title);
        mTextNoteText = findViewById(R.id.text_note_text);

        if (!mIsNewNote){
            displayNote(mSpinnerCourses, mTextNoteTitle, mTextNoteText);
        }

    }

    private void displayNote(Spinner spinnerCourses, EditText textNoteTitle, EditText textNoteText) {


        List<CourseInfo> courses = DataManager.getInstance().getCourses();
        int courseIndex = courses.indexOf(mNote.getCourse());
        spinnerCourses.setSelection(courseIndex);

        textNoteTitle.setText(mNote.getTitle());
        textNoteText.setText(mNote.getText());


    }

    private void readDisplayStateValues() {
        Intent intent = getIntent();
        //mNote = intent.getParcelableExtra(NOTE_POSITION);
//        mIsNewNote = mNote == null;
        int position = intent.getIntExtra(NOTE_POSITION, POSITION_NOT_SET);
        mIsNewNote = position == POSITION_NOT_SET;

        if (mIsNewNote){
            createNewNotes();
        }else{
            mNote = DataManager.getInstance().getNotes().get(position);
        }
    }

    private void createNewNotes() {
        DataManager dm = DataManager.getInstance();
        mNotePosition= dm.createNewNote();
        mNote = dm.getNotes().get(mNotePosition);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_send_mail) {
            sendEmail();
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    protected void onPause() {
        super.onPause();
        saveNote();
    }

    private void saveNote() {
        mNote.setCourse((CourseInfo)mSpinnerCourses.getSelectedItem());
        mNote.setTitle(mTextNoteTitle.getText().toString());
        mNote.setTitle(mTextNoteText.getText().toString());

    }

    private void sendEmail() {

        CourseInfo course = (CourseInfo)  mSpinnerCourses.getSelectedItem();
        String subject = mTextNoteTitle.getText().toString();
        String text = "Checkout what I learned in the Pluralsight crouse \"" +
                        course.getTitle() + " \"\n" + mTextNoteText.getText();
        Intent intent = new Intent(Intent.ACTION_SEND);
        intent.setType("message/rfc2822");
        intent.putExtra(Intent.EXTRA_SUBJECT,subject );
        intent.putExtra(Intent.EXTRA_TEXT,text );
        startActivity(intent);


    }
}