Android-检查文件扩展名是否为.mp4

Question

I want to check if the user entered the extension .mp4 and if it was entered correctly. I know I can do something like this:

if (Rename[0].indexOf(".") > 0) {

}

But the problem with this is that it just checks if there is more than one character entered, so if .mp5 has been entered or any incorrect extension, it would be accepted.

here is the context in which I want to use it:

alertDialogBuilder.setCancelable(false)
    .setPositiveButton("OK", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            Rename[0] = editText.getEditableText().toString();

            if (Rename[0] != null){

            //This is where I want to check if the extension has been correctly entered

            }
}

So my question is:

How can I get the text from Rename{0} , this has already been done, and check if the file extension .mp4 has been entered correctly, if it has not, then add it, else if it was entered (correctly) ignore it?

Answer 1

Try this

if (Rename[0].endsWith(".mp4")) {

        }

Answer 2

do this by below code :

alertDialogBuilder.setCancelable(false)
    .setPositiveButton("OK", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            Rename[0] = editText.getEditableText().toString();

            if (Rename[0] != null){

              if(Rename[0].contains(".mp4"){
             //do what you want to do here
             }

            }
}