Creating a 2-column list or table on the fly

iaindownie · by **iaindownie** » Mon Jan 18, 2010 1:07 pm

Hi,
I have an application that does some calculations based on input to a form, which takes up about 1/2 a screen. I want to populate a ListView or some sort of table in the bottom half of the screen depending on the choices in the top half.

At the moment I'm getting static data output when I hit submit using the following:

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Using java Syntax Highlighting

        public void setSplits() {
 
                lv = (ListView) findViewById(R.id.ListView01);
 
                ListAdapter birds = (ListAdapter) ArrayAdapter.createFromResource(this,
 
                                R.array.species, android.R.layout.simple_list_item_1);
 
                lv.setAdapter(birds);
 
                lv.setTextFilterEnabled(true);/**/
 
        }
 
Parsed in 0.049 seconds,  using GeSHi 1.0.8.4

Syntax: [ Download ] [ Hide ]

Using xml Syntax Highlighting

                <ListView android:id="@+id/ListView01"
 
                android:layout_width="wrap_content"
 
                android:layout_height="wrap_content"
 
                android:layout_below="@+id/EditText03a" />
 
Parsed in 0.001 seconds,  using GeSHi 1.0.8.4

This creates a nice, scrollable ListView in the bottom half of the screen which wasn't there when app loaded, but it's from a resource (xml array). I need it to take values I feed the ListView from an ArrayList after calculations from the form, or some other similar Java container which is empty to begin with.

1. Any sample code of populating a ListView NOT from "createFromResource"
2. Anyone recommend a better View for this rather than a ListView? I want it to be two equal columns, each column left justified with text only, and scrollable.

Thanks in advance
Iain

iaindownie · by **iaindownie** » Tue Jan 19, 2010 5:06 pm

Update on my miserable attempts to fix this:

I tried to get the ListView showing a String Array using

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Using java Syntax Highlighting

        public void setSplits() {
 
                lv = (ListView) findViewById(R.id.ListView01);
 
                String[] mStrings = new String[]{"Android", "Google", "Eclipse"};
 
                ArrayAdapter a = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mStrings);
 
                lv.setAdapter((ListAdapter)a);
 
                lv.setTextFilterEnabled(true);
 
        }
 
Parsed in 0.032 seconds,  using GeSHi 1.0.8.4

instead of getting the data from an XML like (this works):

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Using java Syntax Highlighting

        public void setSplits() {
 
                lv = (ListView) findViewById(R.id.ListView01);
 
                ListAdapter birds = (ListAdapter) ArrayAdapter.createFromResource(this,
 
                                R.array.species, android.R.layout.simple_list_item_1);
 
                lv.setAdapter(birds);
 
                lv.setTextFilterEnabled(true);
 
        }
 
Parsed in 0.036 seconds,  using GeSHi 1.0.8.4

but I get the following error:

01-19 15:55:38.811: ERROR/AndroidRuntime(811): java.lang.RuntimeException: Unable to start activity ComponentInfo{bto.android/bto.android.PaceCalc}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'

Can anyone help me work out what I'm doing wrong? Do I have to have the lv object created originally in onCreate method? This isn't needed for the second, resource populated method.

Really struggling, hope someone can help.
Iain

iaindownie · by **iaindownie** » Tue Jan 19, 2010 5:39 pm

OK, cracked populating a ListView on the fly from an ArrayList rather than an XML file.

Will continue to think on a better, scrollable view than basic ListView.

Cheers
Iain

Creating a 2-column list or table on the fly

Creating a 2-column list or table on the fly

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