Problema com mudança de tela Android

MainActivity.java

package br.com.aplicacao.app;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;


public class MainActivity extends Activity {

	Button Votar;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.inicio);
		Votar = (Button) findViewById(R.id.btVotar);
	}

	public void Votar(View v) {
		Intent troca = new Intent(IntensaoActivity.this, Votar.class);
		startActivity(troca);
		finish();
	}

}

Manifest.xml

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

    <uses-sdk
        android:minSdkVersion="7"
        android:targetSdkVersion="7" />

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="br.com.aplicacao.app.MainActivity"
            android:label="@string/app_name"
            android:theme="@android:style/Theme.Light.NoTitleBar.Fullscreen" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="br.com.aplicacao.app.Login"
            android:label="@string/app_name"
            android:theme="@android:style/Theme.Light.NoTitleBar.Fullscreen" >
        </activity>
    </application>

</manifest>

Votar.java

package br.com.aplicacao.app;
import android.app.Activity;
import android.os.Bundle;

public class Login extends Activity {

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

}