public class MainActivity extends AppCompatActivity implements OnClickListener{

Button btnSUB;
EditText et1,et2,et3,et4;
String validemail="[a-zA-Z0-9\+\.\_\%\-]{1,256}" +"\@" +"[a-zA-Z0-9][a-zA-Z0-9\-]{0,64}" +"(" +"\." +"[a-zA-Z0-9][a-zA-Z0-9\-]{0,25}" +")+";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btnSUB = (Button) findViewById(R.id.buttonSubmit);
    et1 = (EditText) findViewById(R.id.editTextEmail);
    et2 = (EditText) findViewById(R.id.editTextName);
    et3 = (EditText) findViewById(R.id.editTextPhoneNumber);
    et4 = (EditText) findViewById(R.id.editTextCnic);
    btnSUB.setOnClickListener(this);
}


@Override
public void onClick(View view){

    String email=et1.getText().toString();
    Matcher matcher=Pattern.compile(validemail).matcher(email);
    if(matcher.matches()){
      Toast.makeText(getApplicationContext(),"Success...",Toast.LENGTH_LONG).show();


      Intent intent=new Intent(this,Main2Activity.class);

        intent.putExtra("Uname",et2.getText().toString());
        intent.putExtra("Uemail",et1.getText().toString());
        intent.putExtra("Uphone",et3.getText().toString());
        intent.putExtra("Ucnic",et4.getText().toString());
        startActivity(intent);
    }
    else{
        Toast.makeText(getApplicationContext(),"Enter a valid email!",Toast.LENGTH_LONG).show();
    }

}

}