BackToolbarActivity.java

package com.materialdoc.ui.activity;

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

import com.materialdoc.R;

public class BackToolbarActivity extends AppCompatActivity {

    public static void start(@NonNull Activity activity) {
        Intent intent = new Intent(activity, BackToolbarActivity.class);
        activity.startActivity(intent);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.ac_back_toolbar);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onBackPressed();
            }
        });
    }
}