add Done.java

Count/Done.java

+package com.example.count;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+
+public class Done extends Activity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.done_layout);
+        Button btn = findViewById(R.id.ok);
+
+        btn.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                startActivity(new Intent(Done.this, StudentID.class));
+
+            }
+        });
+    }
+}