I added ImageButtons and listener, now emulator crashes

Here is my code below. When I just had the EditText Box code, it loaded fine. When I added the ImageButtons and listeners, it will not run at all. I do not want to add method code until I can get it to at least run. I am running on API 7

package org.chrome9.golfCalc;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.TextView;

public class launchCalculator extends Activity  {

       private EditText txtEditScore;
       private EditText txtEditRating;
       private EditText txtEditSlope;

       private ImageButton btnCalc;
       private ImageButton btnNext;
       private ImageButton btnBack;
       private ImageButton btnReset; 
       private ImageButton btnCourseHandicap;

       private TextView txtHeader;
       private TextView txtEnterScore;
       private TextView txtEnterRating;
       private TextView txtEnterSlope;
       private TextView txtBottom;


    // Variables in the application

    int[] Score = new int[20];
    double[] Rating = new double[20];
    double[] Slope = new double[20];

    double CourseHandicapResult = 0;

    /** Called when the activity is first created. */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        btnCalc = (ImageButton)findViewById(R.id.btnCalc);
        btnCalc.setEnabled(false);
        btnCalc.setOnClickListener(calcListener);

        btnNext=(ImageButton)findViewById(R.id.btnNext);
        btnNext.setEnabled(false);
        btnNext.setOnClickListener(nextListener);

        btnBack=(ImageButton)findViewById(R.id.btnBack);
        btnBack.setEnabled(false);
        btnBack.setOnClickListener(backListener);

        btnReset=(ImageButton)findViewById(R.id.btnReset);
        btnReset.setEnabled(false);
        btnReset.setOnClickListener(resetListener);

        btnCourseHandicap=(ImageButton)findViewById(R.id.btnCourseHandicap);
        btnCourseHandicap.setEnabled(false);
        btnCourseHandicap.setOnClickListener(courseHandicapListener);

        txtHeader = (TextView) findViewById(R.id.txtHeader);
        txtHeader = (TextView) findViewById(R.id.txtEnterScore);
        txtHeader = (TextView) findViewById(R.id.txtEnterRating);
        txtHeader = (TextView) findViewById(R.id.txtEnterSlope);
        txtHeader = (TextView) findViewById(R.id.txtBottom);

        txtEditScore = (EditText)findViewById(R.id.txtEditScore);
        txtEditScore.requestFocus();
        txtEditScore.setText("0");

        txtEditRating = (EditText) findViewById(R.id.txtEditRating);
        txtEditRating.setText("0");

        txtEditSlope = (EditText) findViewById(R.id.txtEditSlope);
        txtEditSlope.setText("0");

    }


    private OnClickListener calcListener=new OnClickListener()
    {
        public void onClick(View v)
        {

        }
    };

    private OnClickListener nextListener=new OnClickListener()
    {
        public void onClick(View v)
        {

        }
    };

    private OnClickListener backListener=new OnClickListener()
    {
        public void onClick(View v)
        {

        }
    };

    private OnClickListener resetListener=new OnClickListener()
    {
        public void onClick(View v)
        {

        }
    };

    private OnClickListener courseHandicapListener=new OnClickListener()
    {
        public void onClick(View v)
        {

        }
    };

}

Main XML

<?xml version="1.0" encoding="utf-8"?>

<TableLayout android:id="@+id/tblLayout"
    android:layout_width="fill_parent" android:layout_height="fill_parent"
    android:background="@color/background" xmlns:android="http://schemas.android.com/apk/res/android">

    /* Row 1: This is the Row for the header */
    <TableRow>
        <TextView android:id="@+id/txtHeader" android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:layout_column="0"
            android:layout_span="4" android:typeface="serif" android:textSize="18px"
            android:textColor="@color/darkblue" android:paddingBottom="15px"
            android:paddingTop="5px" android:text="      The Chrome9 Calculator v1.0" />
    </TableRow>

    /* Row 2: This is the Row for Entering the score */

    <TableRow>
        <TextView android:id="@+id/txtEnterScore"
            android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:layout_column="0" android:layout_span="2" android:textSize="18px"
            android:textColor="@color/black" android:text=" Enter Your Score:     " />

        <EditText android:id="@+id/txtEditScore"
            android:layout_height="wrap_content" android:numeric="integer"
            android:layout_column="2" android:layout_span="1" />
    </TableRow>

    /* Row 3: This is the Row for entering the Course rating */

    <TableRow>
        <TextView android:id="@+id/txtEnterRating"
            android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:layout_column="0" android:layout_marginRight="30px"
            android:textSize="18px" android:textColor="@color/black"
            android:text=" Enter Course Rating" />
        <EditText android:id="@+id/txtEditRating"
            android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:numeric="decimal" android:layout_column="2"
            android:layout_span="1" />
    </TableRow>

    /* Row 4: The row for entering the course slope */

    <TableRow>
        <TextView android:id="@+id/txtEnterSlope"
            android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:layout_column="0" android:textSize="18px" android:textColor="@color/black"
            android:text=" Enter Course Slope" />
        <EditText android:id="@+id/txtEditSlope"
            android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:numeric="decimal" android:layout_column="2"
            android:layout_span="1" />
    </TableRow>

    /* This separator view is used to separate
    the area below the buttons which will display the
    calculation results */
    开发者_开发问答<View android:layout_height="2px" android:background="#DDFFDD"
        android:layout_marginTop="5dip" android:layout_marginBottom="5dip" />

    // Row 5 contains a text at column 2

    <TableRow>
        <TextView android:id="@+id/txtHandicap" android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:textSize="18px"
            android:textColor="@color/black" android:text="Handicap:"
            android:layout_column="2" android:layout_span="1" />
    </TableRow>

    /* Row 6: Is the calcuation button and the textbox for the
    results of the handicap calculation*/

    <TableRow>
        <ImageButton android:id="@+id/btnCalc" android:src="@drawable/calculator32"
            android:layout_width="wrap_content" android:layout_height="wrap_content"/>
        <EditText android:id="@+id/txtHandicap" android:layout_width="fill_parent"
            android:layout_height="wrap_content" android:numeric="decimal"
            android:layout_column="2" android:layout_span="1" />
    </TableRow>

    /* Row 7: Back button */
    <TableRow>
        <ImageButton android:id="@+id/btnBack" android:src="@drawable/back32"
            android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:layout_column="0" android:layout_span="1" />
        <Button android:id="@+id/btnCourseHandicap"
            android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:layout_column="2" android:text="Course" android:textSize="18px" />
    </TableRow>

    /* Row 8: The forward and reset/edit buttons */

    <TableRow>
        <ImageButton android:id="@+id/btnNext" android:src="@drawable/forward32"
            android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:layout_column="0" />
        <ImageButton android:id="@+id/btnReset"
            android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:layout_column="2" android:src="@drawable/edit32" />
    </TableRow>

    /* Row 9: This is just a row for the plug of the company */

    <TableRow android:paddingBottom="10dip" android:paddingTop="5dip">

        <TextView android:id="@+id/txtBottom" android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:layout_column="0"
            android:textSize="14px" android:textColor="@color/darkblue"
            android:text="                         www.chrome9.org" />
    </TableRow>

    // End of all rows and widgets

</TableLayout>

Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="org.chrome9.golfCalc"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon">
        <activity android:name=".launchCalculator"
                  >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

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

</manifest>