MainActivity

package smaa.smaa;

import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends Activity {
    EditText ET_NAME, ET_PASS;
    String login_name, login_pass;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ET_NAME = (EditText)findViewById(R.id.user_name);
        ET_PASS = (EditText)findViewById(R.id.user_pass);
    }
    public void userReg(View view) {

        startActivity(new Intent(this, Register.class));
    }
    public void userLogin(View view) {
        login_name = ET_NAME.getText().toString();
        login_pass = ET_PASS.getText().toString();

        String method = "login";
        BackgroundTask backgroundTask = new BackgroundTask(this);
        backgroundTask.execute(method, login_name, login_pass);
    }
}