Android - Open Resource from @Drawable String

Android - Open resource from @drawable String

If you really need to work with a string, try something like this:

private void showImage() {
    String uri = "drawable/icon";

    // int imageResource = R.drawable.icon;
    int imageResource = getResources().getIdentifier(uri, null, getPackageName());

    ImageView imageView = (ImageView) findViewById(R.id.myImageView);
    Drawable image = getResources().getDrawable(imageResource);
    imageView.setImageDrawable(image);
}

Else I would recommend you to work with R.* references like this:

int imageResource = R.drawable.icon;
Drawable image = getResources().getDrawable(imageResource);

Open drawable resource from string

use getResources().getIdentifier for getting drawable id using string name as :

int drwableid = ctx.getResources().getIdentifier("image1", 
                                         "drawable", ctx.getPackageName());
InputStream is = ctx.getResources().openRawResource(drwableid);

Find drawable by string

Yes, you can look it up by name using Resources.getIdentifier().

Context context = imageView.getContext();
int id = context.getResources().getIdentifier("picture0001", "drawable", context.getPackageName());
imageView.setImageResource(id);

It's not efficient, but it works to look up occasional resources.

Open a resource file just with specific String variable

private void showImage() {
    String uri = "drawable/icon";

    // int imageResource = R.drawable.icon;
    int imageResource = getResources().getIdentifier(uri, null, getPackageName());

    ImageView imageView = (ImageView) findViewById(R.id.myImageView);
    Drawable image = getResources().getDrawable(imageResource);
    imageView.setImageDrawable(image);
}

Else I would recommend you to work with R.* references like this:

int imageResource = R.drawable.icon;
  Drawable image = getResources().getDrawable(imageResource);

Reference -> Android - Open resource from @drawable String

how to access the drawable resources by name in android

Note that your approach is almost always the wrong way to do things (better to pass the context into the object itself that is using the drawable than keeping a static Context somewhere).

Given that, if you want to do dynamic drawable loading, you can use getIdentifier:

Resources resources = context.getResources();
final int resourceId = resources.getIdentifier(name, "drawable", 
   context.getPackageName());
return resources.getDrawable(resourceId);

how get Drawable from String path?

The method getDrawable() is deprecated and the alternative is

ContextCompat.getDrawable(context, R.drawable.***);

But if you have a String name of the Image. Then here is what you have to do:

getResources().getIdentifier("image_name_in_drawable_folder", "drawable", getActivity().getPackageName());

Do not put the full path from the Uri. Just put the identifier name only the image name only.

Add drawable in resources string.xml

You can do so by providing text using Spannable string just like that

//your drawable    
ImageSpan is = new ImageSpan(context, R.drawable.arrow);

//your spannable text "Lorem.... amet"
SpannableString spannableText= new SpannableString("Lorem ipsum dolor sit amet");

//apply image to spannable text 
//0 is the flag
//start and end are the index length where you wantg to put the image
spannableText.setSpan(is, startIndex, End index, 0);

//then, you can  apply this tspannable text to textview
yourTextView.setText(spannableText);

How to replace R.drawable.someString

this is not a right syntax, and you must getting compiler time error, before altering image resource you must know that, all resources provided an id, these ids are stored into R.java file. Ids are stored into integer format, and in your application you can fetch all these resources by these id, not by name, so you need to fetch id of resource at first, by:

String mDrawableName = "myimg";
int resID = getResources().getIdentifier(mDrawableName , "drawable", getPackageName());

and then use this resID.

Android, getting resource ID from string?

@EboMike: I didn't know that Resources.getIdentifier() existed.

In my projects I used the following code to do that:

public static int getResId(String resName, Class<?> c) {

    try {
        Field idField = c.getDeclaredField(resName);
        return idField.getInt(idField);
    } catch (Exception e) {
        e.printStackTrace();
        return -1;
    } 
}

It would be used like this for getting the value of R.drawable.icon resource integer value

int resID = getResId("icon", R.drawable.class); // or other resource class

I just found a blog post saying that Resources.getIdentifier() is slower than using reflection like I did. Check it out.

How to access res/drawable/folder

No, Android does not allow subfolders under /res/drawable: Can the Android drawable directory contain subdirectories?

You can however, add all image files under /drawable and then access them programmatically via:

int drawableID = context.getResources().getIdentifier("drawableName", "drawable", getPackageName());
iv.setImageResource(drawableID);

Where drawableName is a name of the drawable file, i.e. myimage if image file is myimage.jpg.

The code above will get image resource with id R.drawable.drawableName.

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