Confused on "shake" and now it won't run.

<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/ball01" />
<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/imageView1"
android:layout_alignLeft="@+id/imageView1"
android:text="Enlighten Me!"
android:textColor="#3f0f7f"
android:textSize="24sp"
android:textStyle="bold|italic"
android:typeface="serif" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:weightSum="1" >
<View
android:id="@+id/view1"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_weight="0.2" />
<TextView
android:id="@+id/textView1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.6"
android:gravity="center_horizontal"
android:shadowColor="@android:color/white"
android:shadowRadius="10"
android:textColorLink="@android:color/white"
android:textSize="32sp" />
<View
android:id="@+id/View2"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_weight="0.2" />
</LinearLayout>
</RelativeLayout>

package com.example.crystal.ball;
import android.app.Activity;
import android.graphics.drawable.AnimationDrawable;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.animation.AlphaAnimation;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
publicclass MainActivity extends Activity {
private CrystalBall mCrystalBall = new CrystalBall();
private TextView mAnswerLabel;
private Button mGgetAnswerButton;
private ImageView mCrystalBallImage;
//private SensorManager mSensorManager;
//private Sensor mAccelerometer;
//private ShakeDetector mShakeDetector;
@Override
publicvoid onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Assign the Views from the layout file
mAnswerLabel = (TextView) findViewById(R.id.textView1);
mGgetAnswerButton = (Button) findViewById(R.id.button1);
mCrystalBallImage = (ImageView) findViewById(R.id.imageView1);
//mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
//mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
//mShakeDetector = new ShakeDetector(new OnShakeListener() {
// @Override
//public void onShake() {
//handleNewAnswer();
// }
//});
//@Override
//public void onResume() {
//super.onResume();
//mSensorManager.registerListener(mShakeDetector, mAccelerometer,
// SensorManager.SENSOR_DELAY_UI);
//}
//@Override
//public void onPause() {
//super.onPause();
//mSensorManager.unregisterListener(mShakeDetector);
}
{
mGgetAnswerButton.setOnClickListener(new View.OnClickListener() {
publicvoid onClick(View v) {
String answer = mCrystalBall.getAnAnswer();
//Update the label with our dynamic answer
mAnswerLabel.setText(answer);
animateCrystalBall();
animateAnswer();
playSound();
}
});
}
publicvoid onClick(View v) {
handleNewAnswer();
}
privatevoid handleNewAnswer() {
// TODO Auto-generated method stub
}
privatevoid animateCrystalBall() {
mCrystalBallImage.setImageResource(R.drawable.ball_animation);
AnimationDrawable ballAnimation = (AnimationDrawable) mCrystalBallImage.getDrawable();
if (ballAnimation.isRunning()) {
ballAnimation.stop();
}
ballAnimation.start();
}
privatevoid animateAnswer() {
AlphaAnimation fadeInAnimation = new AlphaAnimation(0, 1);
fadeInAnimation.setDuration(1500);
fadeInAnimation.setFillAfter(true);
mAnswerLabel.setAnimation(fadeInAnimation);
}
privatevoid playSound() {
MediaPlayer player = MediaPlayer.create(this, R.raw.crystal_ball);
player.start();
player.setOnCompletionListener(new OnCompletionListener() {
@Override
publicvoid onCompletion(MediaPlayer mp) {
mp.release();
}
});
}
@Override
publicboolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
returntrue;
}
}

package com.example.crystal.ball;
import java.util.Random;
publicclass CrystalBall {
//Member variables (properties about the object)
public String[] mAnswers = {
"It is certain",
"It is decidedly so",
"All signs say YES",
"The stars are not aligned",
"My reply is no",
"It is doubtful",
"Better not tell you now",
"Concentrate and ask again",
"Unable to answer now",
"It is hard to say" };
//Methods (abilities: things the object can do)
public String getAnAnswer() {
String answer = "";
//Randomly select one of three answers: Yes, No, or Maybe
Random randomGenerator = new Random(); // Construct a new Random number generator
int randomNumber = randomGenerator.nextInt(mAnswers.length);
answer = mAnswers[randomNumber];
return answer;
}
}