Android：如何检查字符串是否为 Base64 编码？

Question

I am not sure how to check if a String is Base64 encoded or not using android.Base64 . I know in standard Java using java.util.Base64 calling Base64.getDecoder().decode() would through an IllegalArgumentException if the String wasn't already in Base64, but on android I get no such error, so how can I check if it is Base64 encoded?

Answer 1

Add to Gradle:

implementation 'commons-codec:commons-codec:1.9'

Add to your code:

if (Base64.isBase64(yourString)) {
   //do stuff
} else {
   //do other stuff
}

Answer 2

try this:

   try{
     Base64.encode("thestringyouwanttocheck".getBytes(),Base64.DEFAULT);
   }catch(IllegalArgumentException e){
      Toast toast=Toast.makeText(context,"Illigal Input",duration);
      toast.show();
   }