At this point of the code A and B are null:
iA = Integer.parseInt(A.trim());
iB = Integer.parseInt(B.trim());
The computation part should be in your onClick method.
On Tue, Jun 15, 2010 at 6:30 PM, Aaron <amd2...@gmail.com> wrote:
> Trying to get my first android app up and running. It's a basic GCF
> calculator, but I can't get it to run. Can anyone help me out?
>
>
> package com.example.GCF;
>
> import java.util.Arrays;
>
> import android.app.Activity;
> import android.os.Bundle;
> import android.view.View;
> import android.view.View.OnClickListener;
> import android.widget.Button;
> import android.widget.EditText;
> import android.widget.TextView;
>
> public class GCF extends Activity {
> private TextView mAnswer;
> private EditText mA, mB;
> private Button ok;
> private String A, B;
> private int iA, iB;
>
> @Override
> public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> setContentView(R.layout.main);
>
> mA = (EditText) findViewById(R.id.entry);
> mB = (EditText) findViewById(R.id.entry1);
> ok = (Button) findViewById(R.id.ok);
> mAnswer = (TextView) findViewById(R.id.answer1);
>
> ok.setOnClickListener(new OnClickListener() {
> public void onClick(View v)
> {
> A = mA.getText().toString();
> B = mB.getText().toString();
> }
> });
>
> // the String to int conversion happens here
> iA = Integer.parseInt(A.trim());
> iB = Integer.parseInt(B.trim());
>
> while (iA != iB) {
> int[] nums={ iA, iB, Math.abs(iA-iB) };
> Arrays.sort(nums);
> iA=nums[0];
> iB=nums[1];
> }
> updateDisplay();
> }
> private void updateDisplay() {
> mAnswer.setText(
> new StringBuilder().append(iA));
>
> }
>
> }
>
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--
YuviDroid
http://android.yuvalsharon.net
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