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BaseFragment.java
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BaseFragment.java
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/*
* Copyright 2017 Vandolf Estrellado
*
* 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.vestrel00.daggerbutterknifemvp.ui.common.view;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.Context;
import android.os.Bundle;
import android.support.annotation.IdRes;
import android.support.annotation.Nullable;
import android.view.View;
import javax.inject.Inject;
import javax.inject.Named;
import butterknife.ButterKnife;
import butterknife.Unbinder;
import dagger.android.AndroidInjection;
import dagger.android.AndroidInjector;
import dagger.android.DispatchingAndroidInjector;
import dagger.android.HasFragmentInjector;
/**
* Abstract Fragment for all Fragments and child Fragments to extend. This contains some boilerplate
* dependency injection code and activity {@link Context}.
* <p>
* <b>DEPENDENCY INJECTION</b>
* We could extend {@link dagger.android.DaggerFragment} so we can get the boilerplate
* dagger code for free. However, we want to avoid inheritance (if possible and it is in this case)
* so that we have to option to inherit from something else later on if needed.
* <p>
* <b>VIEW BINDING</b>
* This fragment handles view bind and unbinding.
*/
public abstract class BaseFragment extends Fragment implements HasFragmentInjector {
@Inject
protected Context activityContext;
// Note that this should not be used within a child fragment.
@Inject
@Named(BaseFragmentModule.CHILD_FRAGMENT_MANAGER)
protected FragmentManager childFragmentManager;
@Inject
DispatchingAndroidInjector<Fragment> childFragmentInjector;
@Nullable
private Unbinder viewUnbinder;
@Override
public void onAttach(Context context) {
AndroidInjection.inject(this);
super.onAttach(context);
}
@Override
public void onViewStateRestored(Bundle savedInstanceState) {
super.onViewStateRestored(savedInstanceState);
View view = getView();
if (view != null) {
/*
* Bind the views here instead of in onViewCreated so that view state changed listeners
* are not invoked automatically without user interaction.
*
* If we bind before this method (e.g. onViewCreated), then any checked changed
* listeners bound by ButterKnife will be invoked during fragment recreation.
*
* The lifecycle order is as follows (same if added via xml or java
* or if retain instance is true):
*
* onAttach
* onCreateView
* onActivityCreated
* onViewStateRestored
* onResume
*/
viewUnbinder = ButterKnife.bind(this, view);
}
}
@Override
public void onDestroyView() {
if (viewUnbinder != null) {
viewUnbinder.unbind();
}
super.onDestroyView();
}
@Override
public final AndroidInjector<Fragment> fragmentInjector() {
return childFragmentInjector;
}
protected final void addChildFragment(@IdRes int containerViewId, Fragment fragment) {
childFragmentManager.beginTransaction()
.add(containerViewId, fragment)
.commit();
}
}