With R.drawable.test, can test be changed using a for loop?-CodePudding

I am trying to make it so that if a char is '1' then a drawable image of 1 will be shown. If the char is '2' then a 2 image will display.

This will 100% work but it's inefficient

These two are the general idea, but it doesn't work

CodePudding user response：

You could reduce the used ifs and cleanup the code of the first example. Then you do not have to duplicate the if statements (have a look at the DRY principle).

However, you still need a separate drawable for every number:

val mapping = mapOf(
   "1" to R.drawable.rating1,
   "2" to R.drawable.rating2,
   "3" to R.drawable.rating3,
   "4" to R.drawable.rating4,
   ...
   "10" to R.drawable.rating10,
)

val number = parseItem.getImageUrl().charAt(34)
val drawableId = mapping[number]

Picasso
    .get()
    .load(drawableUrl)
    .fit()
    .centerInside()
    .into(holder.imageView)

CodePudding user response：

Use"R.drawable.rating "String.valueOf(i) ".png"

Instead of "R.drawable.rating1.png" in your second attempt

Or just use a switch statement instead.

Let me know if you want switch statement explained