How to handle try catch exception android

Question

I am using a method getBitmap to display images. As I am using this as a method,if it returns bitmap display an image but if it returns null,catch an exception. But if url e

Answer 1

Check your catch expressions

catch (IOException e) {
        e.printStackTrace(); 
        Log.e("IO","IO"+e);
        return null;
    } 
    catch(OutOfMemoryError e1) {
         e1.printStackTrace();  
         Log.e("Memory exceptions","exceptions"+e1);
         return null;
    }

Here you are returning null in both exceptions, My suggestion is initialize a variable in these catch clauses and in your activity method check the value of that variable.

Like this

 String exceptionName="";
 catch (IOException e) {
            e.printStackTrace(); 
            Log.e("IO","IO"+e);
            exceptionName="IOException";
            return null;

        } 
        catch(OutOfMemoryError e1) {
             e1.printStackTrace();  
             Log.e("Memory exceptions","exceptions"+e1);
             exceptionName="OutOfMemoryError";
             return null;
        }

Now in your activity

 Bitmap filename=service.getBitmap(url_box.getText().toString());
    if(file_name!=null)
        {
          displaybitmap(file_name);
        } 
    else
       {  //Toast.makeText("Memory Error");
       //my question is how to handle two exception in UI where memory error and also 
      // when entered url is wrong, file not found exceptions also to handle.

        if (exceptionName.equals("OutOfMemoryError")) {
            // Handle here  
        }
    else{
      // Handle here

        }

        }