Android - 问题 getResources() 和 getPackageName()

Question

I try to use setImageResources() with a way to set a R.drawable. variable_image_file . I have no idea how to do it, so I searched a little and i found this on many forums:

int resID = getResources().getIdentifier(character.getBmppath(), "drawable", getPackageName());
holder.pictureView.setImageResource(resID);

But here is my problem, Android Studio seems to not recognize getResources() and getPackageName() :

(in this code, 'domas.png' is stored in the drawable folder)

I don't find a solution online, can you please help to figure this out ?

Answer 1

Pass a Context to your class and then use getResources on it.

context.getResources().getIdentifier("domas", "drawable", context.getPackageName());

I would suggest you setting image this way

    holder.pictureView.setImageDrawable(
        ContextCompat.getDrawable(
            context,
            R.drawable.domas
        )
    )

Answer 2

如果您的适配器中没有上下文，请尝试此操作。

int resId =holder.firstNameView.getContext().getResources().getIdentifier("domas", "drawable", holder.firstNameView.getContext().getPackageName());

Answer 3

If it is in your drawable folder, you don't need to do anything fancy, this should work after providing a Context (I assume you can easily convert the below to Java from Kotlin):

context?.let {
     if (Build.VERSION.SDK_INT == Build.VERSION_CODES.M) {
           AppCompatResources.getDrawable(it, R.drawable.domas)
     } else {
           it.resources.getDrawable(R.drawable.domas, null)
     }