Listener on Image View

Pushpa.Prakruthi · by **Pushpa.Prakruthi** » Sat Jan 12, 2008 8:53 am

Hi,
I wrote Program to display Image using Gallery and as i focus image through arrow keys I need to display there path in EditText Box (when Image is focusable).I done it, but it is not working on my expectation.Please let me now what i miss in my code.

And also,Is there any way to display multiple picture and when that images is clicked that path or image is loaded to particular file.
I attached my code

plusminus · by **plusminus** » Sat Jan 12, 2008 11:15 am

Hello Pushpa.Prakruthi,

your problem is the following line:

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str=i.getResources().getString(mImageIds[position]).toString();
Parsed in 0.029 seconds,  using GeSHi 1.0.8.4

Because getResources().getString(int) is awaiting the ID of a String-Resource :!:

it is not there to determine the FilePath of the ID passed.

The second thing is, that the images you place under "/res/drawable/" get compiled into you Application, and therefore there is no actual FilePath you can determine

Regards,
plusminus

Pushpa.Prakruthi · by **Pushpa.Prakruthi** » Sat Jan 12, 2008 11:26 am

Hi,

Thanks for your guidence,then how could i resolve my problem.
That is onclick on the focusable image i need to display the Image name and load that image to file.
It is similar as Browse for the image and attach(load) to the file.

plusminus · by **plusminus** » Sat Jan 12, 2008 5:19 pm

Pushpa.Prakruthi wrote: i need to display the Image name and load that image to file.

You meant like:

Displaying: "myImage.png" and >>save<< it to an 'external' file, like on SDCard :?:

I was not aware of a function returning the name (what is the filename without the file-ending) of a known resource (knowing only its ID), so I coded one myself:
Example-Call:

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// Example-Call:
String resName = getResourceNameFromClassByID(R.drawable.class, R.drawable.icon);
// resName would be 'icon'.
Parsed in 0.031 seconds,  using GeSHi 1.0.8.4

The Source:
Using the Java Reflection API this was not hard to do.

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        /**
         * Determines the Name of a Resource, 
         * by passing the <code>R.xyz.class</code> and 
         * the <code>resourceID</code> of the class to it.
         * @param aClass : like <code>R.drawable.class</code>
         * @param resourceID : like <code>R.drawable.icon</code>
         * @throws IllegalArgumentException if field is not found.
         * @throws NullPointerException if <code>aClass</code>-Parameter is null.
         * <br><br>
         * <b>Example-Call:</b><br> 
         * <code>String resName = getResourceNameFromClassByID(R.drawable.class, R.drawable.icon);</code><br>
         * Then <code>resName</code> would be '<b>icon</b>'.*/
        private String getResourceNameFromClassByID(Class<?> aClass, int resourceID) 
                                                throws IllegalArgumentException{
                /* Get all Fields from the class passed. */
                Field[] drawableFields = aClass.getFields();
                
                /* Loop through all Fields. */
                for(Field f : drawableFields){
                        try {
                                /* All fields within the subclasses of R 
                                 * are Integers, so we need no type-check here. */
                                
                                /* Compare to the resourceID we are searching. */
                                if (resourceID == f.getInt(null))
                                        return f.getName(); // Return the name.
                        } catch (Exception e) {
                                e.printStackTrace();
                        }
                }
                /* Throw Exception if nothing was found*/
                throw new IllegalArgumentException();
        }
Parsed in 0.037 seconds,  using GeSHi 1.0.8.4

So all you requested would be like the following:

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                try {
                        String resName = getResourceNameFromClassByID(R.drawable.class, R.drawable.icon);
                        
                        Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.icon);
                        bm.compress(Bitmap.CompressFormat.PNG, 100, openFileOutput(resName + ".png", MODE_WORLD_READABLE));
                } catch (FileNotFoundException e) {
                        e.printStackTrace();
                }
Parsed in 0.036 seconds,  using GeSHi 1.0.8.4

Let us know if it helped you

Regards,
plusminus

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