setImageResource

Question

int i = 1;
String IMG = "pic";
IMG = IMG + Integer.toString(i);
i = i + 1;   

imageview1.setImageResource(R.drawable.IMG);

R.drawable.IMG where IMG is a variable.

This is wrong. What would the right way? I want to change a imageview from pic1 to picN.

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int[] images = new int[]{R.drawable.pic1, R.drawable.pic2, R.drawable.pic3};

This is better, but How can I insert a vector element into a imageview? Sorry for my bad english level :)

Answer 1

This can be accomplished by using

int resourceId = getResources().getIdentifier("pic" + i, "drawable", getPackageName());

imageview1.setImageResource(resourceId);

This is proven to be fairly slow. A better option might be to keep an array of your drawable IDs and loop through that..

int[] drawables = new int[] { R.drawable.pic1, R.drawable.pic2 };

Answer 2

The identifiers that identify the resources in your app are not a series of sequential numbers. Create an array of the images you've added, eg

int[] images = new int[]{R.drawable.pic1, R.drawable.pic2, R.drawable.pic3};

and increment the index in that instead?

Answer 3

与@dymmeh提供的解决方案类似，您也可以使用Java Reflection来执行此操作，但是我怀疑它也可能很慢。

int resId = R.drawable.getClass().getField("pic" + i).getInt(R.drawable);