BaseContainerActivity.java

/*
 * Copyright (c) 2014-2015 Sean Liu.
 *
 * 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.github.baoti.pioneer.ui.common.base;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;

/**
 * Created by liuyedong on 14-12-18.
 */
public abstract class BaseContainerActivity<F extends Fragment> extends FragmentActivity {
    public static final int TRANSITION_INIT_FRAGMENT = FragmentTransaction.TRANSIT_NONE;

    public static final String TAG_CONTENT_FRAGMENT = "app:content_fragment";

    protected F contentFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        onCreateContentView(savedInstanceState);

        initContentFragment(savedInstanceState);
    }

    protected void onCreateContentView(Bundle savedInstanceState) {

    }

    protected void initContentFragment(Bundle savedInstanceState) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        if (savedInstanceState == null) {
            contentFragment = createContentFragment();
            if (contentFragment.getArguments() == null) {
                contentFragment.setArguments(getIntent().getExtras());
            }
            // SHOULD BE TRANSIT_NONE
            fragmentManager.beginTransaction()
                    .setTransition(TRANSITION_INIT_FRAGMENT)
                    .add(fragmentContainerId(), contentFragment, TAG_CONTENT_FRAGMENT)
                    .commit();
        } else {
            //noinspection unchecked
            contentFragment = (F) fragmentManager.findFragmentByTag(TAG_CONTENT_FRAGMENT);
        }
    }

    protected void replaceContentFragment(boolean addToBackStack) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        contentFragment = createContentFragment();
        if (contentFragment.getArguments() == null) {
            contentFragment.setArguments(getIntent().getExtras());
        }
        // SHOULD BE TRANSIT_NONE
        FragmentTransaction transaction = fragmentManager.beginTransaction()
                .setTransition(TRANSITION_INIT_FRAGMENT)
                .replace(fragmentContainerId(), contentFragment, TAG_CONTENT_FRAGMENT);
        if (addToBackStack) {
            transaction.addToBackStack(null).commit();
        } else {
            transaction.commit();
        }
    }

    protected int fragmentContainerId() {
        return android.R.id.content;
    }

    protected abstract F createContentFragment();
}