Set image dynamically by retrieving image name from a data source in android...

    Sometimes there may be situation,where we have the images in our project's drawable folder.But we have to set the images by getting the image name from a data source.In normal condition we can use "R.drawable.imageName"  and the image is set. But in this as we get the image name at run time,we have to set the images dynamically.
     So in this situation first we have to retrieve the image name from the data source(It can be a SQLite database or any other data source).Store it in a string variable.Note here,we have to store  the image name here(not with the extension).So if the data source gives you image name with extension then cut the name from the extension.We need "imageName" here,not "imageName.png".So follow the code below...
try {                
                Class<drawable> res = R.drawable.class;
                if(str!=null){                                    
                Field field = res.getField(str);
                int drawableId = field.getInt(null);
                bengalidaypng.setImageResource(drawableId);               
                }
            }
            catch (Exception e) {
                      System.out.println("Image not found in drawable folder");
            }
         Here "str" is the string variable that hold the imageName retrieved from a data source.If the image with desired name not found in the project's drawable folder then the "catch" block will execute.Hope it is very easy to understand.Feel free to make a comment if you have a doubt.
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4 comments:

  1. AvikJune 13, 2012 at 12:53 PM

    thanks :) nice one

    ReplyDelete
  2. LuizJune 26, 2012 at 6:46 AM

    I used the code but I cant get the image to be shown. Here's the code...

    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    ImageView card1 = new ImageButton(this);
    String str = "drawable/b0";

    try {
    Class res = R.drawable.class;
    if (str != null) {
    Field field = res.getField(str);
    int drawableId = field.getInt(null);
    card1.setImageResource(drawableId);
    setContentView(card1);
    }
    } catch (Exception e) {
    System.out.println("Image not found in drawable folder");
    }

    }

    What am I missing?

    Thanks in advance

    ReplyDelete
  3. BratinJune 26, 2012 at 10:42 PM

    Hi, Luiz...
    Please use String str = "image_name";
    not the drawable/b0.Also don't use the extension with the image name.Only the image name without extension is needed here.Thanks...

    ReplyDelete
  4. AkshayJuly 25, 2012 at 6:46 AM

    thanxx code work like:-
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    ImageView card1 = new ImageButton(this);
    String str = "pic_4";

    try {
    Class res = R.drawable.class;
    if (str != null) {
    Field field = res.getField(str);
    int drawableId = field.getInt(null);
    card1.setImageResource(drawableId);
    setContentView(card1);
    }
    } catch (Exception e) {
    System.out.println("Image not found in drawable folder");
    }

    }

    ReplyDelete