store the note in database instead of shared prefs

app/src/main/java/com/simplemobiletools/notes/activities/MainActivity.java

@@ -2,7 +2,6 @@ package com.simplemobiletools.notes.activities;
 
 import android.content.Context;
 import android.content.Intent;
-import android.content.SharedPreferences;
 import android.content.res.Resources;
 import android.os.Bundle;
 import android.util.TypedValue;
@@ -11,9 +10,10 @@ import android.view.MenuItem;
 import android.view.inputmethod.InputMethodManager;
 import android.widget.EditText;
 
-import com.simplemobiletools.notes.Constants;
 import com.simplemobiletools.notes.R;
 import com.simplemobiletools.notes.Utils;
+import com.simplemobiletools.notes.databases.DBHelper;
+import com.simplemobiletools.notes.models.Note;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
@@ -21,7 +21,8 @@ import butterknife.ButterKnife;
 public class MainActivity extends SimpleActivity {
     @BindView(R.id.notes_view) EditText mNotesView;
 
-    private SharedPreferences mPrefs;
+    private DBHelper mDb;
+    private Note mCurrentNote;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -29,8 +30,9 @@ public class MainActivity extends SimpleActivity {
         setContentView(R.layout.activity_main);
         ButterKnife.bind(this);
 
-        mPrefs = getSharedPreferences(Constants.PREFS_KEY, Context.MODE_PRIVATE);
+        mDb = DBHelper.newInstance(getApplicationContext());
-        mNotesView.setText(getSavedNote());
+        mCurrentNote = mDb.getGeneralNote();
+        mNotesView.setText(mCurrentNote.getValue());
     }
 
     @Override
@@ -77,12 +79,13 @@ public class MainActivity extends SimpleActivity {
 
     private void saveText() {
         final String newText = getCurrentNote();
-        final String oldText = mPrefs.getString(Constants.TEXT, "");
+        final String oldText = mCurrentNote.getValue();
         if (!newText.equals(oldText)) {
             Utils.showToast(getApplicationContext(), R.string.note_saved);
+            mCurrentNote.setValue(newText);
+            mDb.updateNote(mCurrentNote);
         }
 
-        mPrefs.edit().putString(Constants.TEXT, newText).apply();
         hideKeyboard();
         Utils.updateWidget(getApplicationContext());
     }
@@ -108,10 +111,6 @@ public class MainActivity extends SimpleActivity {
         return mNotesView.getText().toString().trim();
     }
 
-    private String getSavedNote() {
-        return mPrefs.getString(Constants.TEXT, "");
-    }
-
     private void hideKeyboard() {
         final InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
         imm.hideSoftInputFromWindow(mNotesView.getWindowToken(), 0);

app/src/main/java/com/simplemobiletools/notes/databases/DBHelper.java

@@ -3,6 +3,7 @@ package com.simplemobiletools.notes.databases;
 import android.content.ContentValues;
 import android.content.Context;
 import android.content.SharedPreferences;
+import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteOpenHelper;
 
@@ -12,12 +13,12 @@ import com.simplemobiletools.notes.models.Note;
 public class DBHelper extends SQLiteOpenHelper {
     private static final String DB_NAME = "notes.db";
     private static final int DB_VERSION = 1;
-    private static final String TABLE = "notes";
+    private static final String TABLE_NAME = "notes";
     private static final String NOTE = "General note";
 
     private static final String COL_ID = "id";
-    private static final String COL_NAME = "name";
+    private static final String COL_TITLE = "title";
-    private static final String COL_TEXT = "value";
+    private static final String COL_VALUE = "value";
 
     private Context mContext;
     private SQLiteDatabase mDb;
@@ -34,10 +35,10 @@ public class DBHelper extends SQLiteOpenHelper {
 
     @Override
     public void onCreate(SQLiteDatabase db) {
-        db.execSQL("CREATE TABLE " + TABLE + " (" +
+        db.execSQL("CREATE TABLE " + TABLE_NAME + " (" +
                 COL_ID + " INTEGER PRIMARY KEY, " +
-                COL_NAME + " TEXT, " +
+                COL_TITLE + " TEXT UNIQUE, " +
-                COL_TEXT + " TEXT" +
+                COL_VALUE + " TEXT" +
                 ")"
         );
 
@@ -52,24 +53,51 @@ public class DBHelper extends SQLiteOpenHelper {
     private void insertFirstNote(SQLiteDatabase db) {
         final SharedPreferences prefs = mContext.getSharedPreferences(Constants.PREFS_KEY, Context.MODE_PRIVATE);
         final String text = prefs.getString(Constants.TEXT, "");
-        final Note note = new Note(0, NOTE, text);
+        final Note note = new Note(1, NOTE, text);
         insertNote(note, db);
     }
 
     private void insertNote(Note note, SQLiteDatabase db) {
         final ContentValues values = fillContentValues(note);
-        db.insert(TABLE, null, values);
+        db.insert(TABLE_NAME, null, values);
     }
 
     public void insertNote(Note note) {
         final ContentValues values = fillContentValues(note);
-        mDb.insert(TABLE, null, values);
+        mDb.insert(TABLE_NAME, null, values);
     }
 
     private ContentValues fillContentValues(Note note) {
         final ContentValues values = new ContentValues();
-        values.put(COL_NAME, note.getName());
+        values.put(COL_TITLE, note.getTitle());
-        values.put(COL_TEXT, note.getText());
+        values.put(COL_VALUE, note.getValue());
         return values;
     }
+
+    public void updateNote(Note note) {
+        final ContentValues values = fillContentValues(note);
+        final String selection = COL_ID + " = ?";
+        final String selectionArgs[] = new String[]{String.valueOf(note.getId())};
+        mDb.update(TABLE_NAME, values, selection, selectionArgs);
+    }
+
+    public Note getGeneralNote() {
+        final String cols[] = {COL_ID, COL_TITLE, COL_VALUE};
+        final String selection = COL_TITLE + " = ?";
+        final String selectionArgs[] = {NOTE};
+        Cursor cursor = mDb.query(TABLE_NAME, cols, selection, selectionArgs, null, null, null);
+        if (cursor == null)
+            return null;
+
+        if (cursor.moveToFirst()) {
+            final int id = cursor.getInt(cursor.getColumnIndex(COL_ID));
+            final String name = cursor.getString(cursor.getColumnIndex(COL_TITLE));
+            final String text = cursor.getString(cursor.getColumnIndex(COL_VALUE));
+            cursor.close();
+            return new Note(id, name, text);
+        }
+
+        cursor.close();
+        return null;
+    }
 }

app/src/main/java/com/simplemobiletools/notes/models/Note.java

@@ -2,24 +2,41 @@ package com.simplemobiletools.notes.models;
 
 public class Note {
     private int mId;
-    private String mName;
+    private String mTitle;
-    private String mText;
+    private String mValue;
 
-    public Note(int id, String name, String text) {
+    public Note(int id, String title, String value) {
         mId = id;
-        mName = name;
+        mTitle = title;
-        mText = text;
+        mValue = value;
     }
 
     public int getId() {
         return mId;
     }
 
-    public String getName() {
+    public String getTitle() {
-        return mName;
+        return mTitle;
     }
 
-    public String getText() {
+    public String getValue() {
-        return mText;
+        return mValue;
+    }
+
+    public void setValue(String value) {
+        mValue = value;
+    }
+
+    public void setTitle(String title) {
+        mTitle = title;
+    }
+
+    @Override
+    public String toString() {
+        return "Note {" +
+                "id=" + getId() +
+                ", title=" + getTitle() +
+                ", value=" + getValue() +
+                "}";
     }
 }