Android setting images inside listView

Question

So i have this listview with my custom XML file that i made for it.

In the file, there is an image with no source set that has a fixed id.

I want to change this image source to one of my resources in drawable folder.

Here is my XML:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<LinearLayout 
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<ImageView 
 android:id="@+id/listImage"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:contentDescription="protection image"
 android:layout_marginTop="10dp"
/>
<LinearLayout 
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginLeft="10dp"
>
<TextView android:id="@+id/text1" 
android:textSize="20dp"  
android:textStyle="bold"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
<TextView android:id="@+id/text2"
android:textSize="12dp" 
android:layout_marginTop="5dp"
android:layout_width="wrap_content" 
android:layout_height="fill_parent"/>
</LinearLayout>
</LinearLayout>

</LinearLayout>

This is what i have tried so far, and it crashes:

        adapter=new SimpleAdapter(this, listItems, R.layout.custom_row_view,new String[]{"name", "current"},  new int[] {R.id.text1, R.id.text2});
    ImageView img;
    img = (ImageView) findViewById(R.id.listImage);
    Drawable d = getResources().getDrawable(R.drawable.opened);
    img.setImageDrawable(d);
    setListAdapter(adapter);

do u want to set same images all list items or different images for each list item ? — KMI
– KMI, Commented May 10, 2012 at 13:47
I have two images, and i need to decide which items gets what image — rel-s
– rel-s, Commented May 10, 2012 at 13:48
its not here, the condition is a simple if statement. i haven't done that yet because i want to see if setting the image even works! — rel-s
– rel-s, Commented May 10, 2012 at 13:51

Andro Selva · Accepted Answer · 2012-05-10 13:50:10Z

1

ImageView img;
    img = (ImageView) findViewById(R.id.listImage);

This means that you are referring to a object with is present in the layout which you could have used for your Activity's setContentView().But your ImageView is not present in that layout.

And here you are trying to refer this with a ListView. So obviously you are getting the null pointer exception.

You have to make use of a Custom Adapter as well as. Try the one from the below link.

http://www.ezzylearning.com/tutorial.aspx?tid=1763429&q=customizing-android-listview-items-with-custom-arrayadapter

http://www.mkyong.com/android/android-listview-example/

answered May 10, 2012 at 13:50

Andro Selva

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8 Comments

rel-s Over a year ago

Im not sure i understand these examples.. Isn't there any simple way just to change the image if i have the id?

Andro Selva Over a year ago

No. Not possible with a Custom Listview. You have to make use of Custom Adapter only.

rel-s Over a year ago

Well, but my listview has two lines. is it possible to adapt this too?

Andro Selva Over a year ago

Yes, with custom listview anything is possible. Give it a try. I can't be done this simple.

rel-s Over a year ago

But i dont know how to do this with two lines. any examples?

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