AS5/main/java/com/example/test1/User_Activity.java

package com.example.test1;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.content.Intent;
import android.widget.Button;
import android.widget.*;

public class User_Activity extends Activity{
    Button button = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.content_user);

        button = (Button)findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setClass(User_Activity.this,LoginActivity.class);
                startActivity(intent);
            }
        });

        button = (Button)findViewById(R.id.p1);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setClass(User_Activity.this,Fragment.class);
                startActivity(intent);
            }
        });
    }

}