src/com/android/incallui/BaseFragment.java

/*
 * Copyright (C) 2013 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.android.incallui;

import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;

/**
 * Parent for all fragments that use Presenters and Ui design.
 */
public abstract class BaseFragment<T extends Presenter<U>, U extends Ui> extends Fragment {

    private static final String KEY_FRAGMENT_HIDDEN = "key_fragment_hidden";

    private T mPresenter;

    public abstract T createPresenter();

    public abstract U getUi();

    protected BaseFragment() {
        mPresenter = createPresenter();
    }

    /**
     * Presenter will be available after onActivityCreated().
     *
     * @return The presenter associated with this fragment.
     */
    public T getPresenter() {
        return mPresenter;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        mPresenter.onUiReady(getUi());
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (savedInstanceState != null) {
            mPresenter.onRestoreInstanceState(savedInstanceState);
            if (savedInstanceState.getBoolean(KEY_FRAGMENT_HIDDEN)) {
                getFragmentManager().beginTransaction().hide(this).commit();
            }
        }
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        mPresenter.onUiDestroy(getUi());
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        mPresenter.onSaveInstanceState(outState);
        outState.putBoolean(KEY_FRAGMENT_HIDDEN, isHidden());
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        ((FragmentDisplayManager) activity).onFragmentAttached(this);
    }
}