Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;

public class Main {
    public static <T extends Fragment> T attach(Activity activity, Class<T> fragmentType, String tag) {
        return attach(activity, 0, fragmentType, tag);
    }

    @SuppressWarnings("unchecked")
    public static <T extends Fragment> T attach(Activity activity, int containerId, Class<T> fragmentType,
            String tag) {
        if (activity == null) {
            throw new IllegalArgumentException("activity is null");
        }
        if (fragmentType == null) {
            throw new IllegalArgumentException("fragmentType is null");
        }
        if (tag == null) {
            throw new IllegalArgumentException("tag is null");
        }

        T result;

        FragmentManager manager = activity.getFragmentManager();
        Fragment fragment = manager.findFragmentByTag(tag);

        if (fragment == null) {
            try {
                result = fragmentType.newInstance();
            } catch (InstantiationException e) {
                throw new IllegalArgumentException(
                        "fragmentType cannot be instantiated (default constructor is not visible)", e);
            } catch (IllegalAccessException e) {
                throw new IllegalArgumentException(
                        "fragmentType cannot be instantiated (instance could not be created)", e);
            }

            manager.beginTransaction().add(containerId, result, tag).commit();
        } else {
            if (!fragmentType.isInstance(fragment)) {
                throw new IllegalArgumentException("Different fragmentType for tag");
            }

            result = (T) fragment;
        }

        return result;
    }
}