Button click=unfortunately app has stopped
<p>Hi im new to android programming and this code produces an error when the button is clicked... It shows unfortunately the application has stopped can anybody check? :( </p>

<pre><code>protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.compute);
    aButton = (Button) this.findViewById(R.id.Button06);

    //get intent
    Intent i = getIntent();
    Bundle extras = i.getExtras(); // get the parameters

    density = getBaseContext().getResources().getDisplayMetrics().density;
    int textViewSizeDp = (int)(200 * density);
    int textFieldSizeDp = (int)(50 * density);

    FieldsLayout = (LinearLayout) findViewById(R.id.FieldsLayout);
    if(extras!=null){
        items = (extras.getString("items")).split(",");
        rows = new LinearLayout[items.length];
        labels = new TextView[items.length];
        fields = new EditText[items.length];

        for (int ctr=0;ctr&lt;items.length;ctr++){
            rows[ctr] = new LinearLayout(Compute.this);
            rows[ctr].setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL);
            rows[ctr].setOrientation(LinearLayout.HORIZONTAL);
            rows[ctr].setLayoutParams(new LayoutParams (LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
            FieldsLayout.addView(rows[ctr]);

            labels[ctr] = new TextView(Compute.this);
            labels[ctr].setText(items[ctr]);
            labels[ctr].setMinimumWidth(textViewSizeDp);
            rows[ctr].addView(labels[ctr]);

            fields[ctr] = new EditText(Compute.this);
            fields[ctr].setMinimumWidth(textFieldSizeDp);
            rows[ctr].addView(fields[ctr]);

        }
    }
    else{
        finish();
    }



    aButton.setOnClickListener(new OnClickListener() {  


        public void onClick(View v) {   

              Intent i = new Intent(Compute.this, Total.class);
              //I believe this causes the error
                for(int ctr=0;ctr&lt;fields.length;ctr++){
                    itemName[ctr] = labels[ctr].getText().toString();
                    }

                for(int ctr=0;ctr&lt;fields.length;ctr++){
                    itemHour[ctr] = Integer.parseInt(fields[ctr].getText().toString());
                    }
                //until here
              i.putExtra("hours",itemHour);
              i.putExtra("items",itemName);
              startActivity(i);
              }});     

}
</code></pre>

<p>here's the error log: (or is this it?)</p>

<pre><code>01-14 09:37:16.047: W/Trace(768): Unexpected value from nativeGetEnabledTags: 0
01-14 09:37:16.187: E/AndroidRuntime(768): FATAL EXCEPTION: main
01-14 09:37:16.187: E/AndroidRuntime(768): java.lang.NullPointerException
01-14 09:37:16.187: E/AndroidRuntime(768):  at com.example.mpc.Compute$1.onClick(Compute.java:82)
01-14 09:37:16.187: E/AndroidRuntime(768):  at android.view.View.performClick(View.java:4202)
01-14 09:37:16.187: E/AndroidRuntime(768):  at android.view.View$PerformClick.run(View.java:17340)
01-14 09:37:16.187: E/AndroidRuntime(768):  at android.os.Handler.handleCallback(Handler.java:725)
01-14 09:37:16.187: E/AndroidRuntime(768):  at android.os.Handler.dispatchMessage(Handler.java:92)
01-14 09:37:16.187: E/AndroidRuntime(768):  at android.os.Looper.loop(Looper.java:137)
01-14 09:37:16.187: E/AndroidRuntime(768):  at android.app.ActivityThread.main(ActivityThread.java:5039)
01-14 09:37:16.187: E/AndroidRuntime(768):  at java.lang.reflect.Method.invokeNative(Native Method)
01-14 09:37:16.187: E/AndroidRuntime(768):  at java.lang.reflect.Method.invoke(Method.java:511)
01-14 09:37:16.187: E/AndroidRuntime(768):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
01-14 09:37:16.187: E/AndroidRuntime(768):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
01-14 09:37:16.187: E/AndroidRuntime(768):  at dalvik.system.NativeStart.main(Native Method)
</code></pre>
