CODEWITHSUNDEEP
android
A Khan
A Khan

Reputation: 131

android: Variable passed for R.drawable.variableValue

    iv.setImageResource(R.drawable.icon);

this line is working good for me

can I pass a variable value instead of icon like if i have 10 images in drawable and i want to decide on runtime which image to show can i pass the value through a variable and work it like

    String variableValue = imageName;
    iv.setImageResource(R.drawable.variableValue);

Upvotes: 12

Views: 17533

Answers (3)

iForests
iForests

Reputation: 6949

Resources.getIdentifier() can solve your problem.

String variableValue = imageName;
iv.setImageResource(getResources().getIdentifier(variableValue, "drawable", getPackageName()));

Upvotes: 22

rekaszeru
rekaszeru

Reputation: 19220

No, it won't work that way.

In your first line icon is a generated static final member of the static final class R.drawable so trying to concatenate it up like it was a String would give you a compiler error.

But you could try using 

iv.setImageURI(uri);

where uri is the URI to your image, so you can use a string value here.
Also, according to the api documentation, it would be a better solution to use setImageBitmap: you should consider it based on your resources.

APIDocs:

public void setImageURI (Uri uri)

Since: API Level 1

Sets the content of this ImageView to the specified Uri.

This does Bitmap reading and decoding on the UI thread, which can cause a latency hiccup. If that's a concern, consider using setImageDrawable(Drawable) or setImageBitmap(Bitmap) and BitmapFactory instead.

Parameters
uri The Uri of an image

Upvotes: 0

RoflcoptrException
RoflcoptrException

Reputation: 52247

You could use an array to define your drawables:

int[] images = new int[2];
images[0] = R.drawables.image1;
images[1] = R.drawables.image2;

And then you can use this array to set a image at runtime:

lv.setImageResource(images[i]);

Where is is in this case either 0 to point to the first image or 1 to point to the second image of the array.

Upvotes: 5

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