com.recurly.androidsdk.BaseActivity.java Source code

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Here is the source code for com.recurly.androidsdk.BaseActivity.java

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/*
 * The MIT License
 * Copyright (c) 2014-2015 Recurly, Inc.
    
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
    
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.recurly.androidsdk;

import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;

import com.recurly.androidsdk.fragment.BaseFragment;

import java.lang.reflect.Constructor;

/**
 * Basic activity class with fragment manager.  Abstracted out from Recurly specific calls for
 * developer clarity.
 *
 */
public class BaseActivity extends FragmentActivity implements FragmentManager.OnBackStackChangedListener {

    public BaseFragment pushFragment(Class fragmentClass) {

        FragmentManager fragmentManager = getSupportFragmentManager();

        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

        BaseFragment currentFragment = (BaseFragment) fragmentManager
                .findFragmentByTag("" + fragmentManager.getBackStackEntryCount());

        BaseFragment fragment = makeInstance(fragmentClass);

        if (currentFragment != null) {
            fragmentTransaction.hide(currentFragment);
        }
        fragmentTransaction.add(R.id.container, fragment, "" + (fragmentManager.getBackStackEntryCount() + 1));

        // add new fragment to the back stack
        fragmentTransaction.addToBackStack(fragmentClass.getName());

        fragmentTransaction.commit();

        return fragment;
    }

    protected BaseFragment makeInstance(Class<? extends BaseFragment> className) {
        try {
            Constructor<? extends BaseFragment> constructor = className.getConstructor(new Class[] {});

            BaseFragment fragment = constructor.newInstance(new Object[] {});
            return fragment;

        } catch (Exception e) {
            throw new IllegalStateException("Error instantiating class", e);
        }
    }

    @Override
    public void onBackPressed() {
        popFragment();
    }

    protected void popFragment() {
        FragmentManager fragmentManager = getSupportFragmentManager();

        int backStackEntryCount = fragmentManager.getBackStackEntryCount();

        if (backStackEntryCount >= 1) {
            // remove existing fragment
            fragmentManager.executePendingTransactions();

            FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
            BaseFragment currentFragment = (BaseFragment) fragmentManager
                    .findFragmentByTag("" + fragmentManager.getBackStackEntryCount());

            BaseFragment nextFragment = (BaseFragment) fragmentManager
                    .findFragmentByTag("" + (fragmentManager.getBackStackEntryCount() - 1));

            if (nextFragment == null) {
                // no more fragments, so exit
                finish();
                return;
            }

            fragmentTransaction.remove(currentFragment);

            fragmentTransaction.show(nextFragment);

            fragmentManager.popBackStack();

            fragmentTransaction.commit();

        } else {
            // going to exit..
            super.onBackPressed();
        }
    }

    @Override
    public void onBackStackChanged() {

    }
}