BaseActivity.java

package com.khmelenko.lab.varis.activity;

import android.support.annotation.IdRes;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;

/**
 * Base activity
 *
 * @author Dmytro Khmelenko
 */
public abstract class BaseActivity extends AppCompatActivity {

    /**
     * Adds new fragment
     *
     * @param containerViewId ID of the container view for fragment
     * @param fragment        Fragment instance
     * @param fragmentTag     Fragment tag
     */
    protected void addFragment(@IdRes int containerViewId,
                               @NonNull Fragment fragment,
                               @NonNull String fragmentTag) {
        if (!fragment.isAdded()) {
            getSupportFragmentManager()
                    .beginTransaction()
                    .add(containerViewId, fragment, fragmentTag)
                    .disallowAddToBackStack()
                    .commit();
        }
    }

    /**
     * Replaces fragment
     *
     * @param containerViewId    ID of the container view for fragment
     * @param fragment           Fragment instance
     * @param fragmentTag        Fragment tag
     * @param backStackStateName Name in back stack
     */
    protected void replaceFragment(@IdRes int containerViewId,
                                   @NonNull Fragment fragment,
                                   @NonNull String fragmentTag,
                                   @Nullable String backStackStateName) {
        getSupportFragmentManager()
                .beginTransaction()
                .replace(containerViewId, fragment, fragmentTag)
                .addToBackStack(backStackStateName)
                .commit();
    }

    /**
     * Replaces fragment
     *
     * @param containerViewId ID of the container view for fragment
     * @param fragment        Fragment instance
     * @param fragmentTag     Fragment tag
     */
    protected void replaceFragment(@IdRes int containerViewId,
                                   @NonNull Fragment fragment,
                                   @NonNull String fragmentTag) {
        getSupportFragmentManager()
                .beginTransaction()
                .replace(containerViewId, fragment, fragmentTag)
                .commit();
    }

    /**
     * Detaches fragment
     *
     * @param fragment Fragment
     */
    protected void detachFragment(Fragment fragment) {
        getSupportFragmentManager()
                .beginTransaction()
                .detach(fragment)
                .commit();
    }


}