What is the error in this code ? ( Fundamentel Android)

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Android

Hi guys ,

Im new on Android App Development.

Its quite simple code in Android. When checkBox is checked , I will set text to textView control.

sendMessage method is launched with the button OnClick Method.


And also , how can i prevent "Android stopped launch" error ? And how can i show the error written in Code ?

Thans for your help

package com.example.myandroid;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

	Button btn = (Button)findViewById(R.id.button1);
	CheckBox cinsiyet = (CheckBox)findViewById(R.id.checkBox1);
	TextView text = (TextView)findViewById(R.id.textView1);
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}
	public void sendMessage(View v)
	{
	if(cinsiyet.isChecked()==true)	
		text.setText("Secili");
	else 
		text.setText("secili degil");
    

	}
}