Delete MainActivity.java

functionality/MainActivity.java

-package com.example.complaintapp;
-
-import android.content.Intent;
-import android.support.v7.app.AppCompatActivity;
-import android.os.Bundle;
-import android.view.View;
-import android.widget.Button;
-
-public class MainActivity extends AppCompatActivity {
-
-    Button button;
-
-
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        setContentView(R.layout.activity_main);
-        button = findViewById(R.id.btnSign);
-        button.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                Intent myIntent = new Intent(this, NextActivity.class);
-                myIntent.putExtra("key", value); //Optional parameters
-                CurrentActivity.this.startActivity(myIntent);
-            }
-        });
-    }
-
-}