ValidateEmail MainActivity.java

public class MainActivity extends AppCompatActivity {
    private EditText edtPassword;
    private EditText edtEmail;
    private Button btnLogin;

    private String email;
    private String password;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        edtEmail = (EditText) findViewById(R.id.edt_email);
        edtPassword = (EditText) findViewById(R.id.edt_password);
        btnLogin = (Button) findViewById(R.id.button_password);
        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                email = edtEmail.getText().toString();
                password = edtEmail.getText().toString();
                getValidText(email, password);
            }
        });
    }
    public void getValidText(String email, String password) {
        if (email.trim().length() > 0 && password.trim().length() > 0) {
            if (isValidEmailAddress(email)) {
                Toast.makeText(getApplicationContext(),
                        "Email and Password Validation is Valid", Toast.LENGTH_LONG)
                        .show();
            }
            else {
                Toast.makeText(getApplicationContext(),
                        "Email Validation is Wrong", Toast.LENGTH_LONG)
                        .show();
            }
        }
        else {
            Toast.makeText(getApplicationContext(),"Please Input Your Email and Password",Toast.LENGTH_LONG).show();
        }

    }

    public boolean isValidEmailAddress(String email) {
        String ePattern = "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\])|(([a-zA-Z\\-0-9]+\\.)+[a-zA-Z]{2,}))$";
        java.util.regex.Pattern p = java.util.regex.Pattern.compile(ePattern);
        java.util.regex.Matcher m = p.matcher(email);
        return m.matches();
    }

}