Temporary: Fix menu visibility when restoring state in the pager adapter
When restoring the state of the adapter, all the fragments' menu visibility were set to false, effectively disabling the menu from the user until he switched pages or another event that triggered the menu to be visible again happened. FragmentStatePagerAdapter is deprecated and should be replaced with its ViewPager2 counterpart, until then, this should do it.
This commit is contained in:
Mauricio Colli
parent
c6eaed76f3
commit
d8e83dabc6
2 changed files with 320 additions and 2 deletions
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@ -0,0 +1,318 @@
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/*
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* Copyright 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package androidx.fragment.app;
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import android.os.Bundle;
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import android.os.Parcelable;
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import android.util.Log;
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import android.view.View;
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import android.view.ViewGroup;
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import androidx.annotation.IntDef;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import androidx.lifecycle.Lifecycle;
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import androidx.viewpager.widget.PagerAdapter;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.util.ArrayList;
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// TODO: Replace this deprecated class with its ViewPager2 counterpart
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/**
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* This is a copy from {@link androidx.fragment.app.FragmentStatePagerAdapter}.
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* <p>
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* It includes a workaround to fix the menu visibility when the adapter is restored.
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* <p>
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* When restoring the state of this adapter, all the fragments' menu visibility were set to false,
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* effectively disabling the menu from the user until he switched pages or another event that triggered the
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* menu to be visible again happened.
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* <p>
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* <br><b>Check out the changes in:</b>
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* <ul>
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* <li>{@link #saveState()}</li>
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* <li>{@link #restoreState(Parcelable, ClassLoader)}</li>
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* </ul>
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*/
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@SuppressWarnings("deprecation")
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public abstract class FragmentStatePagerAdapterMenuWorkaround extends PagerAdapter {
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private static final String TAG = "FragmentStatePagerAdapt";
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private static final boolean DEBUG = false;
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@Retention(RetentionPolicy.SOURCE)
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@IntDef({BEHAVIOR_SET_USER_VISIBLE_HINT, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT})
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private @interface Behavior { }
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/**
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* Indicates that {@link Fragment#setUserVisibleHint(boolean)} will be called when the current
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* fragment changes.
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*
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* @deprecated This behavior relies on the deprecated
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* {@link Fragment#setUserVisibleHint(boolean)} API. Use
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* {@link #BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT} to switch to its replacement,
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* {@link FragmentTransaction#setMaxLifecycle}.
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* @see #FragmentStatePagerAdapterMenuWorkaround(FragmentManager, int)
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*/
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@Deprecated
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public static final int BEHAVIOR_SET_USER_VISIBLE_HINT = 0;
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/**
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* Indicates that only the current fragment will be in the {@link Lifecycle.State#RESUMED}
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* state. All other Fragments are capped at {@link Lifecycle.State#STARTED}.
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*
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* @see #FragmentStatePagerAdapterMenuWorkaround(FragmentManager, int)
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*/
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public static final int BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT = 1;
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private final FragmentManager mFragmentManager;
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private final int mBehavior;
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private FragmentTransaction mCurTransaction = null;
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private ArrayList<Fragment.SavedState> mSavedState = new ArrayList<Fragment.SavedState>();
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private ArrayList<Fragment> mFragments = new ArrayList<Fragment>();
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private Fragment mCurrentPrimaryItem = null;
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/**
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* Constructor for {@link FragmentStatePagerAdapterMenuWorkaround} that sets the fragment manager for the
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* adapter. This is the equivalent of calling
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* {@link #FragmentStatePagerAdapterMenuWorkaround(FragmentManager, int)} and passing in
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* {@link #BEHAVIOR_SET_USER_VISIBLE_HINT}.
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*
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* <p>Fragments will have {@link Fragment#setUserVisibleHint(boolean)} called whenever the
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* current Fragment changes.</p>
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*
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* @param fm fragment manager that will interact with this adapter
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* @deprecated use {@link #FragmentStatePagerAdapterMenuWorkaround(FragmentManager, int)} with
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* {@link #BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT}
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*/
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@Deprecated
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public FragmentStatePagerAdapterMenuWorkaround(@NonNull FragmentManager fm) {
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this(fm, BEHAVIOR_SET_USER_VISIBLE_HINT);
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}
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/**
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* Constructor for {@link FragmentStatePagerAdapterMenuWorkaround}.
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*
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* If {@link #BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT} is passed in, then only the current
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* Fragment is in the {@link Lifecycle.State#RESUMED} state, while all other fragments are
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* capped at {@link Lifecycle.State#STARTED}. If {@link #BEHAVIOR_SET_USER_VISIBLE_HINT} is
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* passed, all fragments are in the {@link Lifecycle.State#RESUMED} state and there will be
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* callbacks to {@link Fragment#setUserVisibleHint(boolean)}.
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*
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* @param fm fragment manager that will interact with this adapter
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* @param behavior determines if only current fragments are in a resumed state
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*/
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public FragmentStatePagerAdapterMenuWorkaround(@NonNull FragmentManager fm,
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@Behavior int behavior) {
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mFragmentManager = fm;
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mBehavior = behavior;
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}
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/**
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* Return the Fragment associated with a specified position.
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*/
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@NonNull
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public abstract Fragment getItem(int position);
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@Override
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public void startUpdate(@NonNull ViewGroup container) {
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if (container.getId() == View.NO_ID) {
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throw new IllegalStateException("ViewPager with adapter " + this
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+ " requires a view id");
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}
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}
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@SuppressWarnings("deprecation")
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@NonNull
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@Override
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public Object instantiateItem(@NonNull ViewGroup container, int position) {
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// If we already have this item instantiated, there is nothing
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// to do. This can happen when we are restoring the entire pager
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// from its saved state, where the fragment manager has already
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// taken care of restoring the fragments we previously had instantiated.
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if (mFragments.size() > position) {
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Fragment f = mFragments.get(position);
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if (f != null) {
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return f;
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}
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}
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if (mCurTransaction == null) {
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mCurTransaction = mFragmentManager.beginTransaction();
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}
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Fragment fragment = getItem(position);
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if (DEBUG) Log.v(TAG, "Adding item #" + position + ": f=" + fragment);
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if (mSavedState.size() > position) {
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Fragment.SavedState fss = mSavedState.get(position);
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if (fss != null) {
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fragment.setInitialSavedState(fss);
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}
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}
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while (mFragments.size() <= position) {
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mFragments.add(null);
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}
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fragment.setMenuVisibility(false);
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if (mBehavior == BEHAVIOR_SET_USER_VISIBLE_HINT) {
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fragment.setUserVisibleHint(false);
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}
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mFragments.set(position, fragment);
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mCurTransaction.add(container.getId(), fragment);
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if (mBehavior == BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) {
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mCurTransaction.setMaxLifecycle(fragment, Lifecycle.State.STARTED);
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}
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return fragment;
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}
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@Override
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public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
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Fragment fragment = (Fragment) object;
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if (mCurTransaction == null) {
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mCurTransaction = mFragmentManager.beginTransaction();
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}
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if (DEBUG) Log.v(TAG, "Removing item #" + position + ": f=" + object
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+ " v=" + ((Fragment)object).getView());
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while (mSavedState.size() <= position) {
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mSavedState.add(null);
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}
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mSavedState.set(position, fragment.isAdded()
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? mFragmentManager.saveFragmentInstanceState(fragment) : null);
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mFragments.set(position, null);
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mCurTransaction.remove(fragment);
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if (fragment == mCurrentPrimaryItem) {
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mCurrentPrimaryItem = null;
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}
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}
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@Override
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@SuppressWarnings({"ReferenceEquality", "deprecation"})
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public void setPrimaryItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
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Fragment fragment = (Fragment)object;
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if (fragment != mCurrentPrimaryItem) {
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if (mCurrentPrimaryItem != null) {
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mCurrentPrimaryItem.setMenuVisibility(false);
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if (mBehavior == BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) {
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if (mCurTransaction == null) {
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mCurTransaction = mFragmentManager.beginTransaction();
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}
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mCurTransaction.setMaxLifecycle(mCurrentPrimaryItem, Lifecycle.State.STARTED);
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} else {
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mCurrentPrimaryItem.setUserVisibleHint(false);
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}
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}
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fragment.setMenuVisibility(true);
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if (mBehavior == BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) {
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if (mCurTransaction == null) {
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mCurTransaction = mFragmentManager.beginTransaction();
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}
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mCurTransaction.setMaxLifecycle(fragment, Lifecycle.State.RESUMED);
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} else {
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fragment.setUserVisibleHint(true);
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}
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mCurrentPrimaryItem = fragment;
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}
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}
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@Override
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public void finishUpdate(@NonNull ViewGroup container) {
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if (mCurTransaction != null) {
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mCurTransaction.commitNowAllowingStateLoss();
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mCurTransaction = null;
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}
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}
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@Override
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public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
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return ((Fragment)object).getView() == view;
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}
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//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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private final String SELECTED_FRAGMENT = "selected_fragment";
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//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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@Override
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@Nullable
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public Parcelable saveState() {
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Bundle state = null;
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if (mSavedState.size() > 0) {
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state = new Bundle();
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Fragment.SavedState[] fss = new Fragment.SavedState[mSavedState.size()];
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mSavedState.toArray(fss);
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state.putParcelableArray("states", fss);
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}
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for (int i=0; i<mFragments.size(); i++) {
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Fragment f = mFragments.get(i);
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if (f != null && f.isAdded()) {
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if (state == null) {
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state = new Bundle();
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}
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String key = "f" + i;
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mFragmentManager.putFragment(state, key, f);
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//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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// Check if it's the same fragment instance
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if (f == mCurrentPrimaryItem) {
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state.putString(SELECTED_FRAGMENT, key);
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}
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//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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}
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}
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return state;
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}
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@Override
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public void restoreState(@Nullable Parcelable state, @Nullable ClassLoader loader) {
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if (state != null) {
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Bundle bundle = (Bundle)state;
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bundle.setClassLoader(loader);
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Parcelable[] fss = bundle.getParcelableArray("states");
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mSavedState.clear();
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mFragments.clear();
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if (fss != null) {
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for (int i=0; i<fss.length; i++) {
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mSavedState.add((Fragment.SavedState)fss[i]);
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}
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}
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Iterable<String> keys = bundle.keySet();
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for (String key: keys) {
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if (key.startsWith("f")) {
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int index = Integer.parseInt(key.substring(1));
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Fragment f = mFragmentManager.getFragment(bundle, key);
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if (f != null) {
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while (mFragments.size() <= index) {
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mFragments.add(null);
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}
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//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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final boolean wasSelected = bundle.getString(SELECTED_FRAGMENT, "").equals(key);
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f.setMenuVisibility(wasSelected);
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//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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mFragments.set(index, f);
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} else {
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Log.w(TAG, "Bad fragment at key " + key);
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}
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}
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}
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}
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}
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}
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@ -16,7 +16,7 @@ import androidx.appcompat.app.ActionBar;
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import androidx.appcompat.app.AppCompatActivity;
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import androidx.appcompat.app.AppCompatActivity;
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import androidx.fragment.app.Fragment;
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import androidx.fragment.app.Fragment;
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import androidx.fragment.app.FragmentManager;
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import androidx.fragment.app.FragmentManager;
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import androidx.fragment.app.FragmentStatePagerAdapter;
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import androidx.fragment.app.FragmentStatePagerAdapterMenuWorkaround;
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import androidx.viewpager.widget.ViewPager;
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import androidx.viewpager.widget.ViewPager;
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import com.google.android.material.tabs.TabLayout;
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import com.google.android.material.tabs.TabLayout;
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@ -185,7 +185,7 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
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updateTitleForTab(tab.getPosition());
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updateTitleForTab(tab.getPosition());
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}
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}
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private static class SelectedTabsPagerAdapter extends FragmentStatePagerAdapter {
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private static class SelectedTabsPagerAdapter extends FragmentStatePagerAdapterMenuWorkaround {
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private final Context context;
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private final Context context;
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private final List<Tab> internalTabsList;
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private final List<Tab> internalTabsList;
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Reference in a new issue