Trying to get drawable resource ID from its name in Android

Issue

I have a resource file like this:

strings.xml

<string name="category01">My Category 01</string>
<string name="category02">My Category 02</string>
<string name="category03">My Category 03</string>

<string-array name="array_category_01">
    <item name="title">@string/category01</item>
    <item name="image">@drawable/img01</item>
</string-array>

<string-array name="array_category_02">
    <item name="title">@string/category02</item>
    <item name="image">@drawable/img02</item>
</string-array>

<string-array name="array_category_03">
    <item name="title">@string/category03</item>
    <item name="image">@drawable/img03</item>
</string-array>

<string-array name="categories_array">
    <item>@array/array_category_01</item>
    <item>@array/array_category_02</item>
    <item>@array/array_category_03</item>
</string-array>

Note: @drawable/img01, @drawable/img02 and @drawable/img03 are png images locates at res\drawable folder

Later I perform below iteration to retrieve category-images pairs:

    Resources res = this.context.getResources();
    TypedArray ta = res.obtainTypedArray(R.array.categories_array);
    int n = ta.length();
    String[][] array = new String[n][];
    for (int i = 0; i < n; ++i) {
        int id = ta.getResourceId(i, 0);
        if (id > 0) {
            array[i] = res.getStringArray(id);
        } else {
            // something wrong with the XML
        }
    }
    ta.recycle();

so for example at the end I get an array which contents are:

array[0]
  |
  ---> [0] "My Category 01"
  |
  ---> [1] "res/drawable-xxhdpi-v4/img01.png"

array[1]
  |
  ---> [0] "My Category 02"
  |
  ---> [1] "res/drawable-xxhdpi-v4/img02.png"

array[2]
  |
  ---> [0] "My Category 03"
  |
  ---> [1] "res/drawable-xxhdpi-v4/img03.png"

It is just what I am expected to get, no problem until here.

Later in my code, I need to get the resource ID of one of the categories contained in the above array in order for set the content of an ImageView object so I perform below (let's say I want the image for category 2):

ImageView imageView = (ImageView) rowView.findViewById(R.id.categoryicon);

int resID = this.context.getResources().getIdentifier(array[1][1] , "drawable", this.context.getPackageName());
imageView.setImageResource(resID);

My problem is that resID is zero so it means drawable resource has not been found...

In order to work I need image names in the array to be img01, img02, img03 instead of "res/drawable-xxhdpi-v4/img01.png", "res/drawable-xxhdpi-v4/img02.png" and "res/drawable-xxhdpi-v4/img03.png" respectively so when I pass the names to getIdentifier through array[x][y] it works.

How can I get rid of this?

Solution

One simple solution would be to parse the string and get only the image name as below.

String[] Image1 = array[1][1].split("/");
String s = Image1[Image1.length-1].replace(".png","").trim();

int resID = this.context.getResources().getIdentifier(s , "drawable", this.context.getPackageName());

Answered By - Prem