Note Taking App

Stores Notes And Displays Previously stored Notes in App

Author: Ashleshk

notetakingapp/MainActivity.java

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+package com.lenovo.notetakingapp;
+
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.support.v7.app.AlertDialog;
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.ListView;
+import android.widget.Toast;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+
+public class MainActivity extends AppCompatActivity {
+
+    static  ArrayList<String> notes = new ArrayList<>();
+    static ArrayAdapter arrayAdapter;
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        MenuInflater menuInflater = getMenuInflater();
+        menuInflater.inflate(R.menu.add_note_menu,menu);
+        return super.onCreateOptionsMenu(menu);
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        super.onOptionsItemSelected(item);
+        if(item.getItemId()==R.id.add_note)
+        {
+            Intent intent = new Intent(getApplicationContext(),NoteEditorActivity.class);
+            startActivity(intent);
+            return true;
+        }
+        return  false;
+
+    }
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        ListView listView = (ListView)findViewById(R.id.listView);
+        final SharedPreferences sharedPreferences = getApplicationContext().getSharedPreferences("com.lenovo.notetakingapp", Context.MODE_PRIVATE);
+        final HashSet<String> set = (HashSet<String>) sharedPreferences.getStringSet("notes",null);
+        if (set ==null)
+        {
+            notes.add("Example notes");
+
+        }
+        else
+        {
+            notes = new ArrayList(set);
+        }
+        arrayAdapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,notes);
+        listView.setAdapter(arrayAdapter);
+
+        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
+            @Override
+            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+                Intent intent = new Intent(getApplicationContext(),NoteEditorActivity.class);
+                intent.putExtra("noteId",position);
+                startActivity(intent);
+            }
+        });
+        listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener(){
+
+                @Override
+                public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {
+                    new AlertDialog.Builder(MainActivity.this)
+                            .setIcon(android.R.drawable.ic_dialog_alert)
+                            .setTitle("Are you Sure")
+                            .setMessage("Do you want to delete this note!!")
+                            .setPositiveButton("Yes",new DialogInterface.OnClickListener(){
+
+                                @Override
+                                public void onClick(DialogInterface dialog, int which) {
+                                     notes.remove(position);
+                                    arrayAdapter.notifyDataSetChanged();
+                                    HashSet<String> set = new HashSet<String>(MainActivity.notes);
+                                    sharedPreferences.edit().putStringSet("notes",set).apply();
+
+                                }
+                            })
+                            .setNegativeButton("No",null)
+                            .show();
+
+
+                    return true;
+                }
+            }
+         );
+    }
+}

notetakingapp/NoteEditorActivity.java

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+package com.lenovo.notetakingapp;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.text.Editable;
+import android.text.TextWatcher;
+import android.widget.EditText;
+
+import java.util.HashSet;
+
+public class NoteEditorActivity extends AppCompatActivity {
+
+     int noteid;
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_note_editor);
+
+        EditText editText =(EditText)findViewById(R.id.editText);
+        Intent intent = getIntent();
+        noteid= intent.getIntExtra("noteId",-1);
+        if(noteid !=-1)
+        {
+            editText.setText(MainActivity.notes.get(noteid));
+        }else
+        {
+            MainActivity.notes.add("");
+            noteid=MainActivity.notes.size()-1;
+            MainActivity.arrayAdapter.notifyDataSetChanged();
+        }
+
+        editText.addTextChangedListener(new TextWatcher() {
+            @Override
+            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start, int before, int count) {
+                    MainActivity.notes.set(noteid,String.valueOf(s));
+                MainActivity.arrayAdapter.notifyDataSetChanged();
+
+                SharedPreferences sharedPreferences = getApplicationContext().getSharedPreferences("com.lenovo.notetakingapp", Context.MODE_PRIVATE);
+                HashSet<String> set = new HashSet<String>(MainActivity.notes);
+                sharedPreferences.edit().putStringSet("notes",set).apply();
+
+            }
+
+            @Override
+            public void afterTextChanged(Editable s) {
+
+            }
+        });
+    }
+}