ADD week 5
This commit is contained in:
@@ -0,0 +1,514 @@
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package androidx.viewpager2.adapter;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.Looper;
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import android.os.Parcelable;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.ViewParent;
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import android.widget.FrameLayout;
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import androidx.collection.ArraySet;
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import androidx.collection.LongSparseArray;
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import androidx.core.util.Preconditions;
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import androidx.core.view.ViewCompat;
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import androidx.fragment.app.Fragment;
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import androidx.fragment.app.FragmentActivity;
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import androidx.fragment.app.FragmentManager;
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import androidx.fragment.app.FragmentTransaction;
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import androidx.lifecycle.Lifecycle;
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import androidx.lifecycle.LifecycleEventObserver;
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import androidx.lifecycle.LifecycleOwner;
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import androidx.recyclerview.widget.RecyclerView;
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import androidx.viewpager2.widget.ViewPager2;
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import java.util.Iterator;
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/* loaded from: classes.dex */
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public abstract class FragmentStateAdapter extends RecyclerView.Adapter<FragmentViewHolder> implements StatefulAdapter {
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private static final long GRACE_WINDOW_TIME_MS = 10000;
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private static final String KEY_PREFIX_FRAGMENT = "f#";
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private static final String KEY_PREFIX_STATE = "s#";
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final FragmentManager mFragmentManager;
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private FragmentMaxLifecycleEnforcer mFragmentMaxLifecycleEnforcer;
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final LongSparseArray<Fragment> mFragments;
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private boolean mHasStaleFragments;
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boolean mIsInGracePeriod;
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private final LongSparseArray<Integer> mItemIdToViewHolder;
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final Lifecycle mLifecycle;
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private final LongSparseArray<Fragment.SavedState> mSavedStates;
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public abstract Fragment createFragment(int i);
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@Override // androidx.recyclerview.widget.RecyclerView.Adapter
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public long getItemId(int i) {
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return i;
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}
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@Override // androidx.recyclerview.widget.RecyclerView.Adapter
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public final boolean onFailedToRecycleView(FragmentViewHolder fragmentViewHolder) {
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return true;
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}
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public FragmentStateAdapter(FragmentActivity fragmentActivity) {
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this(fragmentActivity.getSupportFragmentManager(), fragmentActivity.getLifecycle());
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}
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public FragmentStateAdapter(Fragment fragment) {
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this(fragment.getChildFragmentManager(), fragment.getLifecycle());
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}
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public FragmentStateAdapter(FragmentManager fragmentManager, Lifecycle lifecycle) {
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this.mFragments = new LongSparseArray<>();
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this.mSavedStates = new LongSparseArray<>();
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this.mItemIdToViewHolder = new LongSparseArray<>();
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this.mIsInGracePeriod = false;
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this.mHasStaleFragments = false;
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this.mFragmentManager = fragmentManager;
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this.mLifecycle = lifecycle;
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super.setHasStableIds(true);
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}
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@Override // androidx.recyclerview.widget.RecyclerView.Adapter
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public void onAttachedToRecyclerView(RecyclerView recyclerView) {
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Preconditions.checkArgument(this.mFragmentMaxLifecycleEnforcer == null);
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FragmentMaxLifecycleEnforcer fragmentMaxLifecycleEnforcer = new FragmentMaxLifecycleEnforcer();
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this.mFragmentMaxLifecycleEnforcer = fragmentMaxLifecycleEnforcer;
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fragmentMaxLifecycleEnforcer.register(recyclerView);
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}
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@Override // androidx.recyclerview.widget.RecyclerView.Adapter
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public void onDetachedFromRecyclerView(RecyclerView recyclerView) {
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this.mFragmentMaxLifecycleEnforcer.unregister(recyclerView);
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this.mFragmentMaxLifecycleEnforcer = null;
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}
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@Override // androidx.recyclerview.widget.RecyclerView.Adapter
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public final FragmentViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
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return FragmentViewHolder.create(viewGroup);
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}
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@Override // androidx.recyclerview.widget.RecyclerView.Adapter
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public final void onBindViewHolder(final FragmentViewHolder fragmentViewHolder, int i) {
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long itemId = fragmentViewHolder.getItemId();
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int id = fragmentViewHolder.getContainer().getId();
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Long itemForViewHolder = itemForViewHolder(id);
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if (itemForViewHolder != null && itemForViewHolder.longValue() != itemId) {
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removeFragment(itemForViewHolder.longValue());
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this.mItemIdToViewHolder.remove(itemForViewHolder.longValue());
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}
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this.mItemIdToViewHolder.put(itemId, Integer.valueOf(id));
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ensureFragment(i);
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final FrameLayout container = fragmentViewHolder.getContainer();
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if (ViewCompat.isAttachedToWindow(container)) {
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if (container.getParent() != null) {
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throw new IllegalStateException("Design assumption violated.");
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}
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container.addOnLayoutChangeListener(new View.OnLayoutChangeListener() { // from class: androidx.viewpager2.adapter.FragmentStateAdapter.1
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@Override // android.view.View.OnLayoutChangeListener
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public void onLayoutChange(View view, int i2, int i3, int i4, int i5, int i6, int i7, int i8, int i9) {
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if (container.getParent() != null) {
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container.removeOnLayoutChangeListener(this);
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FragmentStateAdapter.this.placeFragmentInViewHolder(fragmentViewHolder);
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}
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}
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});
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}
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gcFragments();
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}
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void gcFragments() {
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if (!this.mHasStaleFragments || shouldDelayFragmentTransactions()) {
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return;
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}
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ArraySet arraySet = new ArraySet();
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for (int i = 0; i < this.mFragments.size(); i++) {
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long keyAt = this.mFragments.keyAt(i);
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if (!containsItem(keyAt)) {
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arraySet.add(Long.valueOf(keyAt));
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this.mItemIdToViewHolder.remove(keyAt);
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}
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}
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if (!this.mIsInGracePeriod) {
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this.mHasStaleFragments = false;
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for (int i2 = 0; i2 < this.mFragments.size(); i2++) {
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long keyAt2 = this.mFragments.keyAt(i2);
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if (!isFragmentViewBound(keyAt2)) {
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arraySet.add(Long.valueOf(keyAt2));
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}
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}
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}
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Iterator<E> it = arraySet.iterator();
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while (it.hasNext()) {
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removeFragment(((Long) it.next()).longValue());
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}
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}
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private boolean isFragmentViewBound(long j) {
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View view;
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if (this.mItemIdToViewHolder.containsKey(j)) {
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return true;
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}
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Fragment fragment = this.mFragments.get(j);
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return (fragment == null || (view = fragment.getView()) == null || view.getParent() == null) ? false : true;
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}
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private Long itemForViewHolder(int i) {
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Long l = null;
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for (int i2 = 0; i2 < this.mItemIdToViewHolder.size(); i2++) {
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if (this.mItemIdToViewHolder.valueAt(i2).intValue() == i) {
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if (l != null) {
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throw new IllegalStateException("Design assumption violated: a ViewHolder can only be bound to one item at a time.");
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}
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l = Long.valueOf(this.mItemIdToViewHolder.keyAt(i2));
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}
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}
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return l;
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}
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private void ensureFragment(int i) {
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long itemId = getItemId(i);
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if (this.mFragments.containsKey(itemId)) {
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return;
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}
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Fragment createFragment = createFragment(i);
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createFragment.setInitialSavedState(this.mSavedStates.get(itemId));
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this.mFragments.put(itemId, createFragment);
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}
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@Override // androidx.recyclerview.widget.RecyclerView.Adapter
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public final void onViewAttachedToWindow(FragmentViewHolder fragmentViewHolder) {
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placeFragmentInViewHolder(fragmentViewHolder);
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gcFragments();
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}
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void placeFragmentInViewHolder(final FragmentViewHolder fragmentViewHolder) {
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Fragment fragment = this.mFragments.get(fragmentViewHolder.getItemId());
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if (fragment == null) {
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throw new IllegalStateException("Design assumption violated.");
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}
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FrameLayout container = fragmentViewHolder.getContainer();
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View view = fragment.getView();
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if (!fragment.isAdded() && view != null) {
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throw new IllegalStateException("Design assumption violated.");
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}
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if (fragment.isAdded() && view == null) {
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scheduleViewAttach(fragment, container);
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return;
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}
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if (fragment.isAdded() && view.getParent() != null) {
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if (view.getParent() != container) {
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addViewToContainer(view, container);
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}
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} else {
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if (fragment.isAdded()) {
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addViewToContainer(view, container);
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return;
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}
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if (!shouldDelayFragmentTransactions()) {
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scheduleViewAttach(fragment, container);
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this.mFragmentManager.beginTransaction().add(fragment, "f" + fragmentViewHolder.getItemId()).setMaxLifecycle(fragment, Lifecycle.State.STARTED).commitNow();
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this.mFragmentMaxLifecycleEnforcer.updateFragmentMaxLifecycle(false);
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return;
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}
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if (this.mFragmentManager.isDestroyed()) {
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return;
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}
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this.mLifecycle.addObserver(new LifecycleEventObserver() { // from class: androidx.viewpager2.adapter.FragmentStateAdapter.2
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@Override // androidx.lifecycle.LifecycleEventObserver
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public void onStateChanged(LifecycleOwner lifecycleOwner, Lifecycle.Event event) {
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if (FragmentStateAdapter.this.shouldDelayFragmentTransactions()) {
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return;
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}
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lifecycleOwner.getLifecycle().removeObserver(this);
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if (ViewCompat.isAttachedToWindow(fragmentViewHolder.getContainer())) {
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FragmentStateAdapter.this.placeFragmentInViewHolder(fragmentViewHolder);
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}
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}
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});
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}
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}
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private void scheduleViewAttach(final Fragment fragment, final FrameLayout frameLayout) {
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this.mFragmentManager.registerFragmentLifecycleCallbacks(new FragmentManager.FragmentLifecycleCallbacks() { // from class: androidx.viewpager2.adapter.FragmentStateAdapter.3
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@Override // androidx.fragment.app.FragmentManager.FragmentLifecycleCallbacks
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public void onFragmentViewCreated(FragmentManager fragmentManager, Fragment fragment2, View view, Bundle bundle) {
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if (fragment2 == fragment) {
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fragmentManager.unregisterFragmentLifecycleCallbacks(this);
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FragmentStateAdapter.this.addViewToContainer(view, frameLayout);
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}
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}
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}, false);
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}
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void addViewToContainer(View view, FrameLayout frameLayout) {
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if (frameLayout.getChildCount() > 1) {
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throw new IllegalStateException("Design assumption violated.");
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}
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if (view.getParent() == frameLayout) {
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return;
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}
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if (frameLayout.getChildCount() > 0) {
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frameLayout.removeAllViews();
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}
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if (view.getParent() != null) {
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((ViewGroup) view.getParent()).removeView(view);
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}
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frameLayout.addView(view);
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}
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@Override // androidx.recyclerview.widget.RecyclerView.Adapter
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public final void onViewRecycled(FragmentViewHolder fragmentViewHolder) {
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Long itemForViewHolder = itemForViewHolder(fragmentViewHolder.getContainer().getId());
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if (itemForViewHolder != null) {
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removeFragment(itemForViewHolder.longValue());
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this.mItemIdToViewHolder.remove(itemForViewHolder.longValue());
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}
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}
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private void removeFragment(long j) {
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ViewParent parent;
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Fragment fragment = this.mFragments.get(j);
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if (fragment == null) {
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return;
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}
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if (fragment.getView() != null && (parent = fragment.getView().getParent()) != null) {
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((FrameLayout) parent).removeAllViews();
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}
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if (!containsItem(j)) {
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this.mSavedStates.remove(j);
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}
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if (!fragment.isAdded()) {
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this.mFragments.remove(j);
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return;
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}
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if (shouldDelayFragmentTransactions()) {
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this.mHasStaleFragments = true;
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return;
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}
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if (fragment.isAdded() && containsItem(j)) {
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this.mSavedStates.put(j, this.mFragmentManager.saveFragmentInstanceState(fragment));
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}
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this.mFragmentManager.beginTransaction().remove(fragment).commitNow();
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this.mFragments.remove(j);
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}
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boolean shouldDelayFragmentTransactions() {
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return this.mFragmentManager.isStateSaved();
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}
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public boolean containsItem(long j) {
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return j >= 0 && j < ((long) getItemCount());
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}
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@Override // androidx.recyclerview.widget.RecyclerView.Adapter
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public final void setHasStableIds(boolean z) {
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throw new UnsupportedOperationException("Stable Ids are required for the adapter to function properly, and the adapter takes care of setting the flag.");
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}
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@Override // androidx.viewpager2.adapter.StatefulAdapter
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public final Parcelable saveState() {
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Bundle bundle = new Bundle(this.mFragments.size() + this.mSavedStates.size());
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for (int i = 0; i < this.mFragments.size(); i++) {
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long keyAt = this.mFragments.keyAt(i);
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Fragment fragment = this.mFragments.get(keyAt);
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if (fragment != null && fragment.isAdded()) {
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this.mFragmentManager.putFragment(bundle, createKey(KEY_PREFIX_FRAGMENT, keyAt), fragment);
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}
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}
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for (int i2 = 0; i2 < this.mSavedStates.size(); i2++) {
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long keyAt2 = this.mSavedStates.keyAt(i2);
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if (containsItem(keyAt2)) {
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bundle.putParcelable(createKey(KEY_PREFIX_STATE, keyAt2), this.mSavedStates.get(keyAt2));
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}
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}
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return bundle;
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}
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@Override // androidx.viewpager2.adapter.StatefulAdapter
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public final void restoreState(Parcelable parcelable) {
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if (!this.mSavedStates.isEmpty() || !this.mFragments.isEmpty()) {
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throw new IllegalStateException("Expected the adapter to be 'fresh' while restoring state.");
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}
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Bundle bundle = (Bundle) parcelable;
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if (bundle.getClassLoader() == null) {
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bundle.setClassLoader(getClass().getClassLoader());
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}
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for (String str : bundle.keySet()) {
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if (isValidKey(str, KEY_PREFIX_FRAGMENT)) {
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this.mFragments.put(parseIdFromKey(str, KEY_PREFIX_FRAGMENT), this.mFragmentManager.getFragment(bundle, str));
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} else if (isValidKey(str, KEY_PREFIX_STATE)) {
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long parseIdFromKey = parseIdFromKey(str, KEY_PREFIX_STATE);
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Fragment.SavedState savedState = (Fragment.SavedState) bundle.getParcelable(str);
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if (containsItem(parseIdFromKey)) {
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this.mSavedStates.put(parseIdFromKey, savedState);
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}
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} else {
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throw new IllegalArgumentException("Unexpected key in savedState: " + str);
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}
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}
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if (this.mFragments.isEmpty()) {
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return;
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}
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this.mHasStaleFragments = true;
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this.mIsInGracePeriod = true;
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gcFragments();
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scheduleGracePeriodEnd();
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}
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private void scheduleGracePeriodEnd() {
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final Handler handler = new Handler(Looper.getMainLooper());
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final Runnable runnable = new Runnable() { // from class: androidx.viewpager2.adapter.FragmentStateAdapter.4
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@Override // java.lang.Runnable
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public void run() {
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FragmentStateAdapter.this.mIsInGracePeriod = false;
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FragmentStateAdapter.this.gcFragments();
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}
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};
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this.mLifecycle.addObserver(new LifecycleEventObserver() { // from class: androidx.viewpager2.adapter.FragmentStateAdapter.5
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@Override // androidx.lifecycle.LifecycleEventObserver
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public void onStateChanged(LifecycleOwner lifecycleOwner, Lifecycle.Event event) {
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if (event == Lifecycle.Event.ON_DESTROY) {
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handler.removeCallbacks(runnable);
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lifecycleOwner.getLifecycle().removeObserver(this);
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}
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}
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});
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handler.postDelayed(runnable, GRACE_WINDOW_TIME_MS);
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}
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private static String createKey(String str, long j) {
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return str + j;
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}
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private static boolean isValidKey(String str, String str2) {
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return str.startsWith(str2) && str.length() > str2.length();
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}
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private static long parseIdFromKey(String str, String str2) {
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return Long.parseLong(str.substring(str2.length()));
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}
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class FragmentMaxLifecycleEnforcer {
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private RecyclerView.AdapterDataObserver mDataObserver;
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private LifecycleEventObserver mLifecycleObserver;
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private ViewPager2.OnPageChangeCallback mPageChangeCallback;
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private long mPrimaryItemId = -1;
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private ViewPager2 mViewPager;
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FragmentMaxLifecycleEnforcer() {
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}
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void register(RecyclerView recyclerView) {
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this.mViewPager = inferViewPager(recyclerView);
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ViewPager2.OnPageChangeCallback onPageChangeCallback = new ViewPager2.OnPageChangeCallback() { // from class: androidx.viewpager2.adapter.FragmentStateAdapter.FragmentMaxLifecycleEnforcer.1
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@Override // androidx.viewpager2.widget.ViewPager2.OnPageChangeCallback
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public void onPageScrollStateChanged(int i) {
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FragmentMaxLifecycleEnforcer.this.updateFragmentMaxLifecycle(false);
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}
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@Override // androidx.viewpager2.widget.ViewPager2.OnPageChangeCallback
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public void onPageSelected(int i) {
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FragmentMaxLifecycleEnforcer.this.updateFragmentMaxLifecycle(false);
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}
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};
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this.mPageChangeCallback = onPageChangeCallback;
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this.mViewPager.registerOnPageChangeCallback(onPageChangeCallback);
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DataSetChangeObserver dataSetChangeObserver = new DataSetChangeObserver() { // from class: androidx.viewpager2.adapter.FragmentStateAdapter.FragmentMaxLifecycleEnforcer.2
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@Override // androidx.viewpager2.adapter.FragmentStateAdapter.DataSetChangeObserver, androidx.recyclerview.widget.RecyclerView.AdapterDataObserver
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public void onChanged() {
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FragmentMaxLifecycleEnforcer.this.updateFragmentMaxLifecycle(true);
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}
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};
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this.mDataObserver = dataSetChangeObserver;
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FragmentStateAdapter.this.registerAdapterDataObserver(dataSetChangeObserver);
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this.mLifecycleObserver = new LifecycleEventObserver() { // from class: androidx.viewpager2.adapter.FragmentStateAdapter.FragmentMaxLifecycleEnforcer.3
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@Override // androidx.lifecycle.LifecycleEventObserver
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public void onStateChanged(LifecycleOwner lifecycleOwner, Lifecycle.Event event) {
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FragmentMaxLifecycleEnforcer.this.updateFragmentMaxLifecycle(false);
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}
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};
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FragmentStateAdapter.this.mLifecycle.addObserver(this.mLifecycleObserver);
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}
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void unregister(RecyclerView recyclerView) {
|
||||
inferViewPager(recyclerView).unregisterOnPageChangeCallback(this.mPageChangeCallback);
|
||||
FragmentStateAdapter.this.unregisterAdapterDataObserver(this.mDataObserver);
|
||||
FragmentStateAdapter.this.mLifecycle.removeObserver(this.mLifecycleObserver);
|
||||
this.mViewPager = null;
|
||||
}
|
||||
|
||||
void updateFragmentMaxLifecycle(boolean z) {
|
||||
int currentItem;
|
||||
Fragment fragment;
|
||||
if (FragmentStateAdapter.this.shouldDelayFragmentTransactions() || this.mViewPager.getScrollState() != 0 || FragmentStateAdapter.this.mFragments.isEmpty() || FragmentStateAdapter.this.getItemCount() == 0 || (currentItem = this.mViewPager.getCurrentItem()) >= FragmentStateAdapter.this.getItemCount()) {
|
||||
return;
|
||||
}
|
||||
long itemId = FragmentStateAdapter.this.getItemId(currentItem);
|
||||
if ((itemId != this.mPrimaryItemId || z) && (fragment = FragmentStateAdapter.this.mFragments.get(itemId)) != null && fragment.isAdded()) {
|
||||
this.mPrimaryItemId = itemId;
|
||||
FragmentTransaction beginTransaction = FragmentStateAdapter.this.mFragmentManager.beginTransaction();
|
||||
Fragment fragment2 = null;
|
||||
for (int i = 0; i < FragmentStateAdapter.this.mFragments.size(); i++) {
|
||||
long keyAt = FragmentStateAdapter.this.mFragments.keyAt(i);
|
||||
Fragment valueAt = FragmentStateAdapter.this.mFragments.valueAt(i);
|
||||
if (valueAt.isAdded()) {
|
||||
if (keyAt != this.mPrimaryItemId) {
|
||||
beginTransaction.setMaxLifecycle(valueAt, Lifecycle.State.STARTED);
|
||||
} else {
|
||||
fragment2 = valueAt;
|
||||
}
|
||||
valueAt.setMenuVisibility(keyAt == this.mPrimaryItemId);
|
||||
}
|
||||
}
|
||||
if (fragment2 != null) {
|
||||
beginTransaction.setMaxLifecycle(fragment2, Lifecycle.State.RESUMED);
|
||||
}
|
||||
if (beginTransaction.isEmpty()) {
|
||||
return;
|
||||
}
|
||||
beginTransaction.commitNow();
|
||||
}
|
||||
}
|
||||
|
||||
private ViewPager2 inferViewPager(RecyclerView recyclerView) {
|
||||
ViewParent parent = recyclerView.getParent();
|
||||
if (parent instanceof ViewPager2) {
|
||||
return (ViewPager2) parent;
|
||||
}
|
||||
throw new IllegalStateException("Expected ViewPager2 instance. Got: " + parent);
|
||||
}
|
||||
}
|
||||
|
||||
private static abstract class DataSetChangeObserver extends RecyclerView.AdapterDataObserver {
|
||||
@Override // androidx.recyclerview.widget.RecyclerView.AdapterDataObserver
|
||||
public abstract void onChanged();
|
||||
|
||||
private DataSetChangeObserver() {
|
||||
}
|
||||
|
||||
@Override // androidx.recyclerview.widget.RecyclerView.AdapterDataObserver
|
||||
public final void onItemRangeChanged(int i, int i2) {
|
||||
onChanged();
|
||||
}
|
||||
|
||||
@Override // androidx.recyclerview.widget.RecyclerView.AdapterDataObserver
|
||||
public final void onItemRangeChanged(int i, int i2, Object obj) {
|
||||
onChanged();
|
||||
}
|
||||
|
||||
@Override // androidx.recyclerview.widget.RecyclerView.AdapterDataObserver
|
||||
public final void onItemRangeInserted(int i, int i2) {
|
||||
onChanged();
|
||||
}
|
||||
|
||||
@Override // androidx.recyclerview.widget.RecyclerView.AdapterDataObserver
|
||||
public final void onItemRangeRemoved(int i, int i2) {
|
||||
onChanged();
|
||||
}
|
||||
|
||||
@Override // androidx.recyclerview.widget.RecyclerView.AdapterDataObserver
|
||||
public final void onItemRangeMoved(int i, int i2, int i3) {
|
||||
onChanged();
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,25 @@
|
||||
package androidx.viewpager2.adapter;
|
||||
|
||||
import android.view.ViewGroup;
|
||||
import android.widget.FrameLayout;
|
||||
import androidx.core.view.ViewCompat;
|
||||
import androidx.recyclerview.widget.RecyclerView;
|
||||
|
||||
/* loaded from: classes.dex */
|
||||
public final class FragmentViewHolder extends RecyclerView.ViewHolder {
|
||||
private FragmentViewHolder(FrameLayout frameLayout) {
|
||||
super(frameLayout);
|
||||
}
|
||||
|
||||
static FragmentViewHolder create(ViewGroup viewGroup) {
|
||||
FrameLayout frameLayout = new FrameLayout(viewGroup.getContext());
|
||||
frameLayout.setLayoutParams(new ViewGroup.LayoutParams(-1, -1));
|
||||
frameLayout.setId(ViewCompat.generateViewId());
|
||||
frameLayout.setSaveEnabled(false);
|
||||
return new FragmentViewHolder(frameLayout);
|
||||
}
|
||||
|
||||
FrameLayout getContainer() {
|
||||
return (FrameLayout) this.itemView;
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,10 @@
|
||||
package androidx.viewpager2.adapter;
|
||||
|
||||
import android.os.Parcelable;
|
||||
|
||||
/* loaded from: classes.dex */
|
||||
public interface StatefulAdapter {
|
||||
void restoreState(Parcelable parcelable);
|
||||
|
||||
Parcelable saveState();
|
||||
}
|
||||
Reference in New Issue
Block a user