Sms app code not working take in account I'm a beginner

Hi i'm trying to make a messaging app in java but running into a few problems, please help!

 @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_activity2, menu);

    no=(EditText)findViewById(R.id.editText);
    msg=(EditText)findViewById(R.id.editText2);
    btnsendSms=(Button)findViewById(R.id.button1);

    bntSendsms.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {

            sendSms();
        }
    });
    return true;
}
    protected void sendSms(){
    string number=no.gettext().toString();
    string message=msg.getText().toString();

    SmsManager manager= SmsManager.getDefault();
    manager.sendTextMessage(number, null, message, null, null);
    Toast.makeText(getApplicationContext(), "send succesfully", Toast.LENGTH_LONG).show();
}