com.drcosu.ndileber.utils.ActivityUtils.java Source code

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Here is the source code for com.drcosu.ndileber.utils.ActivityUtils.java

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/*
 * Copyright 2016, The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.drcosu.ndileber.utils;

import android.support.annotation.NonNull;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;

import com.orhanobut.logger.Logger;

/**
 * This provides methods to help Activities load their UI.
 */
public class ActivityUtils {

    /**
     * The {@code fragment} is added to the container view with id {@code frameId}. The operation is
     * performed by the {@code fragmentManager}.
     *
     */
    public static void addFragmentToActivity(@NonNull FragmentManager fragmentManager, @NonNull Fragment fragment,
            int frameId) {
        Check.checkNotNull(fragmentManager);
        Check.checkNotNull(fragment);
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        transaction.add(frameId, fragment);
        transaction.commit();
    }

    /**
     * fragment 
     * @param fragmentManager
     * @param fragmentId
     * @param myFragment
     * @param <T>
     * @return
     */
    public static <T extends Fragment> T getFragment(@NonNull FragmentManager fragmentManager,
            @NonNull int fragmentId, @NonNull T myFragment) {
        Check.checkNotNull(fragmentManager);
        Check.checkNotNull(fragmentId);
        Check.checkNotNull(myFragment);
        T fragment = (T) fragmentManager.findFragmentById(fragmentId);
        if (fragment == null) {
            fragment = myFragment;
            addFragmentToActivity(fragmentManager, fragment, fragmentId);
        }
        return fragment;
    }

    /**
     * ?fragment??,??,fragment???  {@link #switchFragment(FragmentManager, int, Fragment, Fragment)}  }
     * @param fragmentManager
     * @param fragmentId
     * @param myFragment
     * @param <T>
     * @return
     */
    public static <T extends Fragment> T replaceFragment(@NonNull FragmentManager fragmentManager,
            @NonNull int fragmentId, @NonNull T myFragment) {
        Check.checkNotNull(fragmentManager);
        Check.checkNotNull(fragmentId);
        Check.checkNotNull(myFragment);
        T fragment = (T) fragmentManager.findFragmentById(fragmentId);
        if (fragment == null) {
            fragment = myFragment;
            addFragmentToActivity(fragmentManager, fragment, fragmentId);
        } else {
            fragment = myFragment;
            FragmentTransaction transaction = fragmentManager.beginTransaction();
            transaction.replace(fragmentId, fragment);
            transaction.commit();
        }
        return fragment;
    }

    /**
     * ? fragment 
     * @param fragmentManager
     * @param fragmentId
     * @param from
     * @param to
     * @param <T1>
     * @param <T2>
     * @return
     */
    public static <T1 extends Fragment, T2 extends Fragment> T2 switchFragment(
            @NonNull FragmentManager fragmentManager, @NonNull int fragmentId, T1 from, @NonNull T2 to) {
        Check.checkNotNull(fragmentManager);
        Check.checkNotNull(fragmentId);
        Check.checkNotNull(to);
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        if (from == null) {
            if (!to.isAdded()) {
                transaction.add(fragmentId, to).commit();
            } else {
                transaction.show(to).commit();
            }
        } else {
            if (!to.isAdded()) {
                transaction.hide(from).add(fragmentId, to).commit();
            } else {
                transaction.hide(from).show(to).commit();
            }
        }
        return to;
    }

}