Android dynamically change checkbox problem

Question

I'm trying to change my checkbox dynamically. for some reason the app throw my an exception. what am I doing wrong? this is my java code:

package com.school.commtest;

import android.app.Activity; 
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.TableLayout;
import android.widget.TableRow;

public class OtherPlacesMenu extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    CheckBox c1 = (CheckBox)this.findViewById(R.id.schools);

    c1.setChecked(true);

    setContentView(R.layout.otherplacesmenu);
}

}

and this is the xml:

<?xml version="1.0" encoding="utf-8"?>
<TableLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:id="@+id/table">
   <TableRow android:layout_height="fill_parent" android:layout_width="wrap_content"  android:id="@+id/tableRow1">
    <CheckBox android:text="School" android:id="@+id/schools" android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox>
</TableRow>
<TableRow android:layout_height="fill_parent" android:layout_width="wrap_content" android:id="@+id/tableRow2">

    <CheckBox android:text="Supermaker" android:layout_height="wrap_content" android:id="@+id/supermarkets" android:layout_width="wrap_content"></CheckBox>
</TableRow>
<TableRow android:layout_height="fill_parent" android:layout_width="wrap_content" android:id="@+id/tableRow3">

    <CheckBox android:text="Gardens" android:layout_height="wrap_content" android:id="@+id/gardens" android:layout_width="wrap_content"></CheckBox>
 </TableRow>
</TableLayout>

I'm sure its a simple question, but I cannot find the answer anywhere. p.s. I can't set the value of the checkbox to be true at the xml because I would later want to change the checkbox from the user setting. 10x!

adamp · Accepted Answer · 2011-05-07 15:48:10Z

1

Usually you should post the exception message when asking a question like this, but it looks like your problem is that you're trying to findViewById before you setContentView. Your view doesn't exist to be found when you look for it.

answered May 7, 2011 at 15:48

adamp

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1 Comment

doron Over a year ago

i knew it was an easy question :)

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