How do I call my NoteMain class when I click on the "Notes" Button in my android app

Question

As above. I'm to sure what I'm doing wrong. Here is the code for the MainActivity.java and the code for the NoteMain.java When I click on the Notes button on the home screen when the app loads it says Unfortunately,(app name) has stopped.

I don't know why? Any help is appreciated.

Thanks in advance

MainActivity:

package com.qub.buildersbuddy;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

    Button buttonConverter; 
    Button buttonCalculator;
    Button buttonNotePad;



    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        Button ConvertBtn = (Button) findViewById(R.id.butonConverter);
        ConvertBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,CentInch.class);
                startActivity(intent);

            }
        });


        Button CalcBtn = (Button) findViewById(R.id.buttonCalc);
        CalcBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,Calculator.class);
                startActivity(intent);

            }
        });

        Button NoteBtn = (Button) findViewById(R.id.buttonNotes);
        NoteBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,NoteMain.class);
                startActivity(intent);

            }
        });
    }

    public void setupConverterButton(){
        buttonConverter = (Button) findViewById(R.id.butonConverter);
        // Button messageButton = (Button) findViewById(R.id.butonConverter);

}

    public void CentToInch(){
        buttonConverter.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                //opening the
                try{
                    Class centClass = Class
                            .forName("com.qub.buildersbuddy.CentInch");
                    Intent myintent = new Intent(MainActivity.this,centClass);
            startActivity(myintent);
                }catch (ClassNotFoundException e){
                    e.printStackTrace();

                }

            }
    });

}


public void setupCalculatorButton(){
    buttonCalculator = (Button) findViewById(R.id.buttonCalc);
    // Button messageButton = (Button) findViewById(R.id.butonConverter);

}

public void Calculator(){
    buttonCalculator.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            //opening the
            try{
                Class calcClass = Class
                        .forName("com.qub.buildersbuddy.Calculator");
                Intent myintent = new Intent(MainActivity.this,calcClass);
        startActivity(myintent);
            }catch (ClassNotFoundException e){
                e.printStackTrace();

            }

        }
});

}

public void setupNotesButton(){
    buttonNotePad = (Button) findViewById(R.id.buttonNotes);
    // Button messageButton = (Button) findViewById(R.id.butonConverter);

}

public void Notes(){
    buttonNotePad.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            //opening the
            try{
                Class NoteMain = Class
                        .forName("com.qub.buildersbuddy.NoteMain");
                Intent myintent = new Intent(MainActivity.this,NoteMain);
        startActivity(myintent);
            }catch (ClassNotFoundException e){
                e.printStackTrace();

            }

        }
});

}

}

NoteMain

package com.qub.buildersbuddy;


import java.util.ArrayList;
import java.util.Map;
import java.util.Map.Entry;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.ListView;

public class NoteMain extends Activity implements OnItemClickListener, OnClickListener {

    private SharedPreferences spNotes;
    private ArrayList<Note> notes;
    private Button addNote;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_note_main);

        this.addNote = (Button) findViewById(R.id.addNoteButton);
        this.addNote.setOnClickListener(this);
        spNotes = getSharedPreferences("notes", Context.MODE_PRIVATE);

    }

  @Override
    protected void onResume() {
        super.onResume();
        showNotes();
        ListView list = (ListView) findViewById(R.id.listNotes);
        CustomAdapter aa = new CustomAdapter(this, getLayoutInflater(), this.notes, spNotes);
        list.setAdapter(aa);
        list.setOnItemClickListener(this);
    }

    private void showNotes() {
        this.notes = new ArrayList<Note>();
        Map map = spNotes.getAll();
        for (Object o : map.entrySet()) {
            Entry e = (Entry<String, String>) o;
            this.notes.add(new Note((String)e.getKey(), (String)e.getValue()));
        }
    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int position, long id) {
        Intent intent = new Intent(this, NoteActivity.class);
        intent.putExtra("title", this.notes.get(position).getTitle());
        intent.putExtra("text", this.notes.get(position).getText());
        startActivity(intent);
    }


    @Override
    public void onClick(View arg0) {
        Intent intent = new Intent(this, NoteActivity.class);
        startActivity(intent);
    }

}

AndroidManifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.qub.buildersbuddy"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.qub.buildersbuddy.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.qub.buildersbuddy.CentInch"
            android:label="@string/title_activity_cent_inch" >
        </activity>
        <activity
            android:name="com.qub.buildersbuddy.Calculator"
            android:label="@string/title_activity_calculator" >
        </activity>
         <activity
            android:name="com.qub.buildersbuddy.NotePad"
            android:label="@string/title_activity_note" >
        </activity>



    </application>

</manifest>

Answer 1

Its probably because you don't have the NoteMain activity defined in your Manifest.

<activity
    android:name="com.qub.buildersbuddy.NoteMain"
    android:label="@string/title_activity_note" >
</activity>