src/com/android/settings/panel/PanelFragment.java - LeafOS-Project/android_packages_apps_Settings - Gitiles

 /*
  * Copyright (C) 2018 The Android Open Source Project
  *
  * 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.android.settings.panel;

 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.animation.ValueAnimator;
 import android.app.settings.SettingsEnums;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
 import android.text.TextUtils;
 import android.view.Gravity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewTreeObserver;
 import android.view.animation.DecelerateInterpolator;
 import android.widget.Button;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.ProgressBar;
 import android.widget.TextView;

 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.core.graphics.drawable.IconCompat;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentActivity;
 import androidx.lifecycle.LifecycleObserver;
 import androidx.lifecycle.LiveData;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 import androidx.slice.Slice;
 import androidx.slice.SliceMetadata;
 import androidx.slice.widget.SliceLiveData;

 import com.android.internal.annotations.VisibleForTesting;
 import com.android.settings.R;
 import com.android.settings.overlay.FeatureFactory;
 import com.android.settings.panel.PanelLoggingContract.PanelClosedKeys;
 import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
 import com.android.settingslib.utils.ThreadUtils;

 import com.google.android.setupdesign.DividerItemDecoration;

 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;

 public class PanelFragment extends Fragment {

     private static final String TAG = "PanelFragment";

     /**
      * Duration of the animation entering the screen, in milliseconds.
      */
     private static final int DURATION_ANIMATE_PANEL_EXPAND_MS = 250;

     /**
      * Duration of the animation exiting the screen, in milliseconds.
      */
     private static final int DURATION_ANIMATE_PANEL_COLLAPSE_MS = 200;

     /**
      * Duration of timeout waiting for Slice data to bind, in milliseconds.
      */
     private static final int DURATION_SLICE_BINDING_TIMEOUT_MS = 250;

     @VisibleForTesting
     View mLayoutView;
     private TextView mTitleView;
     private Button mSeeMoreButton;
     private Button mDoneButton;
     private RecyclerView mPanelSlices;
     private PanelContent mPanel;
     private MetricsFeatureProvider mMetricsProvider;
     private String mPanelClosedKey;
     private LinearLayout mPanelHeader;
     private ImageView mTitleIcon;
     private LinearLayout mTitleGroup;
     private LinearLayout mHeaderLayout;
     private TextView mHeaderTitle;
     private TextView mHeaderSubtitle;
     private int mMaxHeight;
     private boolean mPanelCreating;
     private ProgressBar mProgressBar;

     private final Map<Uri, LiveData<Slice>> mSliceLiveData = new LinkedHashMap<>();

     @VisibleForTesting
     PanelSlicesLoaderCountdownLatch mPanelSlicesLoaderCountdownLatch;

     private ViewTreeObserver.OnPreDrawListener mOnPreDrawListener = () -> {
         return false;
     };

     private final ViewTreeObserver.OnGlobalLayoutListener mPanelLayoutListener =
             new ViewTreeObserver.OnGlobalLayoutListener() {
                 @Override
                 public void onGlobalLayout() {
                     if (mLayoutView.getHeight() > mMaxHeight) {
                         final ViewGroup.LayoutParams params = mLayoutView.getLayoutParams();
                         params.height = mMaxHeight;
                         mLayoutView.setLayoutParams(params);
                     }
                 }
             };

     private final ViewTreeObserver.OnGlobalLayoutListener mOnGlobalLayoutListener =
             new ViewTreeObserver.OnGlobalLayoutListener() {
                 @Override
                 public void onGlobalLayout() {
                     animateIn();
                     if (mPanelSlices != null) {
                         mPanelSlices.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                     }
                     mPanelCreating = false;
                 }
             };

     private PanelSlicesAdapter mAdapter;

     @Nullable
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
             @Nullable Bundle savedInstanceState) {
         mLayoutView = inflater.inflate(R.layout.panel_layout, container, false);
         mLayoutView.getViewTreeObserver()
                 .addOnGlobalLayoutListener(mPanelLayoutListener);
         mMaxHeight = getResources().getDimensionPixelSize(R.dimen.output_switcher_slice_max_height);
         mPanelCreating = true;
         createPanelContent();
         return mLayoutView;
     }

     /**
      * Animate the old panel out from the screen, then update the panel with new content once the
      * animation is done.
      * <p>
      * Takes the entire panel and animates out from behind the navigation bar.
      * <p>
      * Call createPanelContent() once animation end.
      */
     void updatePanelWithAnimation() {
         mPanelCreating = true;
         final View panelContent = mLayoutView.findViewById(R.id.panel_container);
         final AnimatorSet animatorSet = buildAnimatorSet(mLayoutView,
                 0.0f /* startY */, panelContent.getHeight() /* endY */,
                 1.0f /* startAlpha */, 0.0f /* endAlpha */,
                 DURATION_ANIMATE_PANEL_COLLAPSE_MS);

         final ValueAnimator animator = new ValueAnimator();
         animator.setFloatValues(0.0f, 1.0f);
         animatorSet.play(animator);
         animatorSet.addListener(new AnimatorListenerAdapter() {
             @Override
             public void onAnimationEnd(Animator animation) {
                 createPanelContent();
             }
         });
         animatorSet.start();
     }

     boolean isPanelCreating() {
         return mPanelCreating;
     }

     private void createPanelContent() {
         final FragmentActivity activity = getActivity();
         if (activity == null) {
             return;
         }

         if (mLayoutView == null) {
             activity.finish();
             return;
         }

         final ViewGroup.LayoutParams params = mLayoutView.getLayoutParams();
         params.height = ViewGroup.LayoutParams.WRAP_CONTENT;
         mLayoutView.setLayoutParams(params);

         mPanelSlices = mLayoutView.findViewById(R.id.panel_parent_layout);
         mSeeMoreButton = mLayoutView.findViewById(R.id.see_more);
         mDoneButton = mLayoutView.findViewById(R.id.done);
         mTitleView = mLayoutView.findViewById(R.id.panel_title);
         mPanelHeader = mLayoutView.findViewById(R.id.panel_header);
         mTitleIcon = mLayoutView.findViewById(R.id.title_icon);
         mTitleGroup = mLayoutView.findViewById(R.id.title_group);
         mHeaderLayout = mLayoutView.findViewById(R.id.header_layout);
         mHeaderTitle = mLayoutView.findViewById(R.id.header_title);
         mHeaderSubtitle = mLayoutView.findViewById(R.id.header_subtitle);
         mProgressBar = mLayoutView.findViewById(R.id.progress_bar);

         // Make the panel layout gone here, to avoid janky animation when updating from old panel.
         // We will make it visible once the panel is ready to load.
         mPanelSlices.setVisibility(View.GONE);
         // Remove the animator to avoid a RecyclerView crash.
         mPanelSlices.setItemAnimator(null);

         final Bundle arguments = getArguments();
         final String callingPackageName =
                 arguments.getString(SettingsPanelActivity.KEY_CALLING_PACKAGE_NAME);

         mPanel = FeatureFactory.getFactory(activity)
                 .getPanelFeatureProvider()
                 .getPanel(activity, arguments);

         if (mPanel == null) {
             activity.finish();
             return;
         }

         mPanel.registerCallback(new LocalPanelCallback());
         if (mPanel instanceof LifecycleObserver) {
             getLifecycle().addObserver((LifecycleObserver) mPanel);
         }

         mMetricsProvider = FeatureFactory.getFactory(activity).getMetricsFeatureProvider();

         updateProgressBar();

         mPanelSlices.setLayoutManager(new LinearLayoutManager((activity)));
         // Add predraw listener to remove the animation and while we wait for Slices to load.
         mLayoutView.getViewTreeObserver().addOnPreDrawListener(mOnPreDrawListener);

         // Start loading Slices. When finished, the Panel will animate in.
         loadAllSlices();

         final IconCompat icon = mPanel.getIcon();
         final CharSequence title = mPanel.getTitle();
         final CharSequence subtitle = mPanel.getSubTitle();

         if (icon != null || (subtitle != null && subtitle.length() > 0)) {
             enablePanelHeader(icon, title, subtitle);
         } else {
             enableTitle(title);
         }

         mSeeMoreButton.setOnClickListener(getSeeMoreListener());
         mDoneButton.setOnClickListener(getCloseListener());

         if (mPanel.isCustomizedButtonUsed()) {
             enableCustomizedButton();
         } else if (mPanel.getSeeMoreIntent() == null) {
             // If getSeeMoreIntent() is null hide the mSeeMoreButton.
             mSeeMoreButton.setVisibility(View.GONE);
         }

         // Log panel opened.
         mMetricsProvider.action(
                 0 /* attribution */,
                 SettingsEnums.PAGE_VISIBLE /* opened panel - Action */,
                 mPanel.getMetricsCategory(),
                 callingPackageName,
                 0 /* value */);
     }

     private void enablePanelHeader(IconCompat icon, CharSequence title, CharSequence subtitle) {
         mTitleView.setVisibility(View.GONE);
         mPanelHeader.setVisibility(View.VISIBLE);
         mPanelHeader.setAccessibilityPaneTitle(title);
         mHeaderTitle.setText(title);
         mHeaderSubtitle.setText(subtitle);
         mHeaderSubtitle.setAccessibilityPaneTitle(subtitle);
         if (icon != null) {
             mTitleGroup.setVisibility(View.VISIBLE);
             mHeaderLayout.setGravity(Gravity.LEFT);
             mTitleIcon.setImageIcon(icon.toIcon(getContext()));
             if (mPanel.getHeaderIconIntent() != null) {
                 mTitleIcon.setOnClickListener(getHeaderIconListener());
                 mTitleIcon.setLayoutParams(new LinearLayout.LayoutParams(
                         ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
             } else {
                 final int size = getResources().getDimensionPixelSize(
                         R.dimen.output_switcher_panel_icon_size);
                 mTitleIcon.setLayoutParams(new LinearLayout.LayoutParams(size, size));
             }
         } else {
             mTitleGroup.setVisibility(View.GONE);
             mHeaderLayout.setGravity(Gravity.CENTER_HORIZONTAL);
         }
     }

     private void enableTitle(CharSequence title) {
         mPanelHeader.setVisibility(View.GONE);
         mTitleView.setVisibility(View.VISIBLE);
         mTitleView.setAccessibilityPaneTitle(title);
         mTitleView.setText(title);
     }

     private void enableCustomizedButton() {
         final CharSequence customTitle = mPanel.getCustomizedButtonTitle();
         if (TextUtils.isEmpty(customTitle)) {
             mSeeMoreButton.setVisibility(View.GONE);
         } else {
             mSeeMoreButton.setVisibility(View.VISIBLE);
             mSeeMoreButton.setText(customTitle);
         }
     }

     private void updateProgressBar() {
         if (mPanel.isProgressBarVisible()) {
             mProgressBar.setVisibility(View.VISIBLE);
         } else {
             mProgressBar.setVisibility(View.GONE);
         }
     }

     private void loadAllSlices() {
         mSliceLiveData.clear();
         final List<Uri> sliceUris = mPanel.getSlices();
         mPanelSlicesLoaderCountdownLatch = new PanelSlicesLoaderCountdownLatch(sliceUris.size());

         for (Uri uri : sliceUris) {
             final LiveData<Slice> sliceLiveData = SliceLiveData.fromUri(getActivity(), uri,
                     (int type, Throwable source)-> {
                             removeSliceLiveData(uri);
                             mPanelSlicesLoaderCountdownLatch.markSliceLoaded(uri);
                     });

             // Add slice first to make it in order.  Will remove it later if there's an error.
             mSliceLiveData.put(uri, sliceLiveData);

             sliceLiveData.observe(getViewLifecycleOwner(), slice -> {

                 // If the Slice has already loaded, refresh list with slice data.
                 if (mPanelSlicesLoaderCountdownLatch.isSliceLoaded(uri)) {
                     if (mAdapter != null) {
                         int itemIndex = (new ArrayList<>(mSliceLiveData.keySet())).indexOf(uri);
                         mAdapter.notifyItemChanged(itemIndex);
                     }
                     return;
                 }

                 /**
                  * Watching for the {@link Slice} to load.
                  * <p>
                  *     If the Slice comes back {@code null} or with the Error attribute, if slice
                  *     uri is not in the allowlist, remove the Slice data from the list, otherwise
                  *     keep the Slice data.
                  * <p>
                  *     If the Slice has come back fully loaded, then mark the Slice as loaded.  No
                  *     other actions required since we already have the Slice data in the list.
                  * <p>
                  *     If the Slice does not match the above condition, we will still want to mark
                  *     it as loaded after 250ms timeout to avoid delay showing up the panel for
                  *     too long.  Since we are still having the Slice data in the list, the Slice
                  *     will show up later once it is loaded.
                  */
                 final SliceMetadata metadata = SliceMetadata.from(getActivity(), slice);
                 if (slice == null || metadata.isErrorSlice()) {
                     removeSliceLiveData(uri);
                     mPanelSlicesLoaderCountdownLatch.markSliceLoaded(uri);
                 } else if (metadata.getLoadingState() == SliceMetadata.LOADED_ALL) {
                     mPanelSlicesLoaderCountdownLatch.markSliceLoaded(uri);
                 } else {
                     Handler handler = new Handler();
                     handler.postDelayed(() -> {
                         mPanelSlicesLoaderCountdownLatch.markSliceLoaded(uri);
                         loadPanelWhenReady();
                     }, DURATION_SLICE_BINDING_TIMEOUT_MS);
                 }

                 loadPanelWhenReady();
             });
         }
     }

     private void removeSliceLiveData(Uri uri) {
         final List<String> allowList = Arrays.asList(
                 getResources().getStringArray(
                         R.array.config_panel_keep_observe_uri));
         if (!allowList.contains(uri.toString())) {
             mSliceLiveData.remove(uri);
         }
     }

     /**
      * When all of the Slices have loaded for the first time, then we can setup the
      * {@link RecyclerView}.
      * <p>
      * When the Recyclerview has been laid out, we can begin the animation with the
      * {@link mOnGlobalLayoutListener}, which calls {@link #animateIn()}.
      */
     private void loadPanelWhenReady() {
         if (mPanelSlicesLoaderCountdownLatch.isPanelReadyToLoad()) {
             mAdapter = new PanelSlicesAdapter(
                     this, mSliceLiveData, mPanel.getMetricsCategory());
             mPanelSlices.setAdapter(mAdapter);
             mPanelSlices.getViewTreeObserver()
                     .addOnGlobalLayoutListener(mOnGlobalLayoutListener);
             mPanelSlices.setVisibility(View.VISIBLE);

             final FragmentActivity activity = getActivity();
             if (activity == null) {
                 return;
             }
             final DividerItemDecoration itemDecoration = new DividerItemDecoration(activity);
             itemDecoration
                     .setDividerCondition(DividerItemDecoration.DIVIDER_CONDITION_BOTH);
             if (mPanelSlices.getItemDecorationCount() == 0) {
                 mPanelSlices.addItemDecoration(itemDecoration);
             }
         }
     }

     /**
      * Animate a Panel onto the screen.
      * <p>
      * Takes the entire panel and animates in from behind the navigation bar.
      * <p>
      * Relies on the Panel being having a fixed height to begin the animation.
      */
     private void animateIn() {
         final View panelContent = mLayoutView.findViewById(R.id.panel_container);
         final AnimatorSet animatorSet = buildAnimatorSet(mLayoutView,
                 panelContent.getHeight() /* startY */, 0.0f /* endY */,
                 0.0f /* startAlpha */, 1.0f /* endAlpha */,
                 DURATION_ANIMATE_PANEL_EXPAND_MS);
         final ValueAnimator animator = new ValueAnimator();
         animator.setFloatValues(0.0f, 1.0f);
         animatorSet.play(animator);
         animatorSet.start();
         // Remove the predraw listeners on the Panel.
         mLayoutView.getViewTreeObserver().removeOnPreDrawListener(mOnPreDrawListener);
     }

     /**
      * Build an {@link AnimatorSet} to animate the Panel, {@param parentView} in or out of the
      * screen, based on the positional parameters {@param startY}, {@param endY}, the parameters
      * for alpha changes {@param startAlpha}, {@param endAlpha}, and the {@param duration} in
      * milliseconds.
      */
     @NonNull
     private static AnimatorSet buildAnimatorSet(@NonNull View parentView, float startY, float endY,
             float startAlpha, float endAlpha, int duration) {
         final View sheet = parentView.findViewById(R.id.panel_container);
         final AnimatorSet animatorSet = new AnimatorSet();
         animatorSet.setDuration(duration);
         animatorSet.setInterpolator(new DecelerateInterpolator());
         animatorSet.playTogether(
                 ObjectAnimator.ofFloat(sheet, View.TRANSLATION_Y, startY, endY),
                 ObjectAnimator.ofFloat(sheet, View.ALPHA, startAlpha, endAlpha));
         return animatorSet;
     }

     @Override
     public void onDestroyView() {
         super.onDestroyView();

         if (TextUtils.isEmpty(mPanelClosedKey)) {
             mPanelClosedKey = PanelClosedKeys.KEY_OTHERS;
         }

         if (mLayoutView != null) {
             mLayoutView.getViewTreeObserver().removeOnGlobalLayoutListener(mPanelLayoutListener);
         }
         if (mPanel != null) {
             mMetricsProvider.action(
                     0 /* attribution */,
                     SettingsEnums.PAGE_HIDE,
                     mPanel.getMetricsCategory(),
                     mPanelClosedKey,
                     0 /* value */);
         }
     }

     @VisibleForTesting
     View.OnClickListener getSeeMoreListener() {
         return (v) -> {
             mPanelClosedKey = PanelClosedKeys.KEY_SEE_MORE;
             final FragmentActivity activity = getActivity();
             if (mPanel.isCustomizedButtonUsed()) {
                 mPanel.onClickCustomizedButton(activity);
             } else {
                 activity.startActivityForResult(mPanel.getSeeMoreIntent(), 0);
                 activity.finish();
             }
         };
     }

     @VisibleForTesting
     View.OnClickListener getCloseListener() {
         return (v) -> {
             mPanelClosedKey = PanelClosedKeys.KEY_DONE;
             getActivity().finish();
         };
     }

     @VisibleForTesting
     View.OnClickListener getHeaderIconListener() {
         return (v) -> {
             final FragmentActivity activity = getActivity();
             activity.startActivity(mPanel.getHeaderIconIntent());
         };
     }

     int getPanelViewType() {
         return mPanel.getViewType();
     }

     class LocalPanelCallback implements PanelContentCallback {

         @Override
         public void onCustomizedButtonStateChanged() {
             ThreadUtils.postOnMainThread(() -> {
                 enableCustomizedButton();
             });
         }

         @Override
         public void onHeaderChanged() {
             ThreadUtils.postOnMainThread(() -> {
                 enablePanelHeader(mPanel.getIcon(), mPanel.getTitle(), mPanel.getSubTitle());
             });
         }

         @Override
         public void forceClose() {
             mPanelClosedKey = PanelClosedKeys.KEY_OTHERS;
             getFragmentActivity().finish();
         }

         @Override
         public void onTitleChanged() {
             ThreadUtils.postOnMainThread(() -> {
                 enableTitle(mPanel.getTitle());
             });
         }

         @Override
         public void onProgressBarVisibleChanged() {
             ThreadUtils.postOnMainThread(() -> {
                 updateProgressBar();
             });
         }

         @VisibleForTesting
         FragmentActivity getFragmentActivity() {
             return getActivity();
         }
     }
 }
	/*
	* Copyright (C) 2018 The Android Open Source Project
	*
	* 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.android.settings.panel;

	import android.animation.Animator;
	import android.animation.AnimatorListenerAdapter;
	import android.animation.AnimatorSet;
	import android.animation.ObjectAnimator;
	import android.animation.ValueAnimator;
	import android.app.settings.SettingsEnums;
	import android.net.Uri;
	import android.os.Bundle;
	import android.os.Handler;
	import android.text.TextUtils;
	import android.view.Gravity;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.view.ViewTreeObserver;
	import android.view.animation.DecelerateInterpolator;
	import android.widget.Button;
	import android.widget.ImageView;
	import android.widget.LinearLayout;
	import android.widget.ProgressBar;
	import android.widget.TextView;

	import androidx.annotation.NonNull;
	import androidx.annotation.Nullable;
	import androidx.core.graphics.drawable.IconCompat;
	import androidx.fragment.app.Fragment;
	import androidx.fragment.app.FragmentActivity;
	import androidx.lifecycle.LifecycleObserver;
	import androidx.lifecycle.LiveData;
	import androidx.recyclerview.widget.LinearLayoutManager;
	import androidx.recyclerview.widget.RecyclerView;
	import androidx.slice.Slice;
	import androidx.slice.SliceMetadata;
	import androidx.slice.widget.SliceLiveData;

	import com.android.internal.annotations.VisibleForTesting;
	import com.android.settings.R;
	import com.android.settings.overlay.FeatureFactory;
	import com.android.settings.panel.PanelLoggingContract.PanelClosedKeys;
	import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
	import com.android.settingslib.utils.ThreadUtils;

	import com.google.android.setupdesign.DividerItemDecoration;

	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.LinkedHashMap;
	import java.util.List;
	import java.util.Map;

	public class PanelFragment extends Fragment {

	private static final String TAG = "PanelFragment";

	/**
	* Duration of the animation entering the screen, in milliseconds.
	*/
	private static final int DURATION_ANIMATE_PANEL_EXPAND_MS = 250;

	/**
	* Duration of the animation exiting the screen, in milliseconds.
	*/
	private static final int DURATION_ANIMATE_PANEL_COLLAPSE_MS = 200;

	/**
	* Duration of timeout waiting for Slice data to bind, in milliseconds.
	*/
	private static final int DURATION_SLICE_BINDING_TIMEOUT_MS = 250;

	@VisibleForTesting
	View mLayoutView;
	private TextView mTitleView;
	private Button mSeeMoreButton;
	private Button mDoneButton;
	private RecyclerView mPanelSlices;
	private PanelContent mPanel;
	private MetricsFeatureProvider mMetricsProvider;
	private String mPanelClosedKey;
	private LinearLayout mPanelHeader;
	private ImageView mTitleIcon;
	private LinearLayout mTitleGroup;
	private LinearLayout mHeaderLayout;
	private TextView mHeaderTitle;
	private TextView mHeaderSubtitle;
	private int mMaxHeight;
	private boolean mPanelCreating;
	private ProgressBar mProgressBar;

	private final Map<Uri, LiveData<Slice>> mSliceLiveData = new LinkedHashMap<>();

	@VisibleForTesting
	PanelSlicesLoaderCountdownLatch mPanelSlicesLoaderCountdownLatch;

	private ViewTreeObserver.OnPreDrawListener mOnPreDrawListener = () -> {
	return false;
	};

	private final ViewTreeObserver.OnGlobalLayoutListener mPanelLayoutListener =
	new ViewTreeObserver.OnGlobalLayoutListener() {
	@Override
	public void onGlobalLayout() {
	if (mLayoutView.getHeight() > mMaxHeight) {
	final ViewGroup.LayoutParams params = mLayoutView.getLayoutParams();
	params.height = mMaxHeight;
	mLayoutView.setLayoutParams(params);
	}
	}
	};

	private final ViewTreeObserver.OnGlobalLayoutListener mOnGlobalLayoutListener =
	new ViewTreeObserver.OnGlobalLayoutListener() {
	@Override
	public void onGlobalLayout() {
	animateIn();
	if (mPanelSlices != null) {
	mPanelSlices.getViewTreeObserver().removeOnGlobalLayoutListener(this);
	}
	mPanelCreating = false;
	}
	};

	private PanelSlicesAdapter mAdapter;

	@Nullable
	@Override
	public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
	@Nullable Bundle savedInstanceState) {
	mLayoutView = inflater.inflate(R.layout.panel_layout, container, false);
	mLayoutView.getViewTreeObserver()
	.addOnGlobalLayoutListener(mPanelLayoutListener);
	mMaxHeight = getResources().getDimensionPixelSize(R.dimen.output_switcher_slice_max_height);
	mPanelCreating = true;
	createPanelContent();
	return mLayoutView;
	}

	/**
	* Animate the old panel out from the screen, then update the panel with new content once the
	* animation is done.
	* <p>
	* Takes the entire panel and animates out from behind the navigation bar.
	* <p>
	* Call createPanelContent() once animation end.
	*/
	void updatePanelWithAnimation() {
	mPanelCreating = true;
	final View panelContent = mLayoutView.findViewById(R.id.panel_container);
	final AnimatorSet animatorSet = buildAnimatorSet(mLayoutView,
	0.0f /* startY /, panelContent.getHeight() / endY */,
	1.0f /* startAlpha /, 0.0f / endAlpha */,
	DURATION_ANIMATE_PANEL_COLLAPSE_MS);

	final ValueAnimator animator = new ValueAnimator();
	animator.setFloatValues(0.0f, 1.0f);
	animatorSet.play(animator);
	animatorSet.addListener(new AnimatorListenerAdapter() {
	@Override
	public void onAnimationEnd(Animator animation) {
	createPanelContent();
	}
	});
	animatorSet.start();
	}

	boolean isPanelCreating() {
	return mPanelCreating;
	}

	private void createPanelContent() {
	final FragmentActivity activity = getActivity();
	if (activity == null) {
	return;
	}

	if (mLayoutView == null) {
	activity.finish();
	return;
	}

	final ViewGroup.LayoutParams params = mLayoutView.getLayoutParams();
	params.height = ViewGroup.LayoutParams.WRAP_CONTENT;
	mLayoutView.setLayoutParams(params);

	mPanelSlices = mLayoutView.findViewById(R.id.panel_parent_layout);
	mSeeMoreButton = mLayoutView.findViewById(R.id.see_more);
	mDoneButton = mLayoutView.findViewById(R.id.done);
	mTitleView = mLayoutView.findViewById(R.id.panel_title);
	mPanelHeader = mLayoutView.findViewById(R.id.panel_header);
	mTitleIcon = mLayoutView.findViewById(R.id.title_icon);
	mTitleGroup = mLayoutView.findViewById(R.id.title_group);
	mHeaderLayout = mLayoutView.findViewById(R.id.header_layout);
	mHeaderTitle = mLayoutView.findViewById(R.id.header_title);
	mHeaderSubtitle = mLayoutView.findViewById(R.id.header_subtitle);
	mProgressBar = mLayoutView.findViewById(R.id.progress_bar);

	// Make the panel layout gone here, to avoid janky animation when updating from old panel.
	// We will make it visible once the panel is ready to load.
	mPanelSlices.setVisibility(View.GONE);
	// Remove the animator to avoid a RecyclerView crash.
	mPanelSlices.setItemAnimator(null);

	final Bundle arguments = getArguments();
	final String callingPackageName =
	arguments.getString(SettingsPanelActivity.KEY_CALLING_PACKAGE_NAME);

	mPanel = FeatureFactory.getFactory(activity)
	.getPanelFeatureProvider()
	.getPanel(activity, arguments);

	if (mPanel == null) {
	activity.finish();
	return;
	}

	mPanel.registerCallback(new LocalPanelCallback());
	if (mPanel instanceof LifecycleObserver) {
	getLifecycle().addObserver((LifecycleObserver) mPanel);
	}

	mMetricsProvider = FeatureFactory.getFactory(activity).getMetricsFeatureProvider();

	updateProgressBar();

	mPanelSlices.setLayoutManager(new LinearLayoutManager((activity)));
	// Add predraw listener to remove the animation and while we wait for Slices to load.
	mLayoutView.getViewTreeObserver().addOnPreDrawListener(mOnPreDrawListener);

	// Start loading Slices. When finished, the Panel will animate in.
	loadAllSlices();

	final IconCompat icon = mPanel.getIcon();
	final CharSequence title = mPanel.getTitle();
	final CharSequence subtitle = mPanel.getSubTitle();

	if (icon != null \|\| (subtitle != null && subtitle.length() > 0)) {
	enablePanelHeader(icon, title, subtitle);
	} else {
	enableTitle(title);
	}

	mSeeMoreButton.setOnClickListener(getSeeMoreListener());
	mDoneButton.setOnClickListener(getCloseListener());

	if (mPanel.isCustomizedButtonUsed()) {
	enableCustomizedButton();
	} else if (mPanel.getSeeMoreIntent() == null) {
	// If getSeeMoreIntent() is null hide the mSeeMoreButton.
	mSeeMoreButton.setVisibility(View.GONE);
	}

	// Log panel opened.
	mMetricsProvider.action(
	0 /* attribution */,
	SettingsEnums.PAGE_VISIBLE /* opened panel - Action */,
	mPanel.getMetricsCategory(),
	callingPackageName,
	0 /* value */);
	}

	private void enablePanelHeader(IconCompat icon, CharSequence title, CharSequence subtitle) {
	mTitleView.setVisibility(View.GONE);
	mPanelHeader.setVisibility(View.VISIBLE);
	mPanelHeader.setAccessibilityPaneTitle(title);
	mHeaderTitle.setText(title);
	mHeaderSubtitle.setText(subtitle);
	mHeaderSubtitle.setAccessibilityPaneTitle(subtitle);
	if (icon != null) {
	mTitleGroup.setVisibility(View.VISIBLE);
	mHeaderLayout.setGravity(Gravity.LEFT);
	mTitleIcon.setImageIcon(icon.toIcon(getContext()));
	if (mPanel.getHeaderIconIntent() != null) {
	mTitleIcon.setOnClickListener(getHeaderIconListener());
	mTitleIcon.setLayoutParams(new LinearLayout.LayoutParams(
	ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
	} else {
	final int size = getResources().getDimensionPixelSize(
	R.dimen.output_switcher_panel_icon_size);
	mTitleIcon.setLayoutParams(new LinearLayout.LayoutParams(size, size));
	}
	} else {
	mTitleGroup.setVisibility(View.GONE);
	mHeaderLayout.setGravity(Gravity.CENTER_HORIZONTAL);
	}
	}

	private void enableTitle(CharSequence title) {
	mPanelHeader.setVisibility(View.GONE);
	mTitleView.setVisibility(View.VISIBLE);
	mTitleView.setAccessibilityPaneTitle(title);
	mTitleView.setText(title);
	}

	private void enableCustomizedButton() {
	final CharSequence customTitle = mPanel.getCustomizedButtonTitle();
	if (TextUtils.isEmpty(customTitle)) {
	mSeeMoreButton.setVisibility(View.GONE);
	} else {
	mSeeMoreButton.setVisibility(View.VISIBLE);
	mSeeMoreButton.setText(customTitle);
	}
	}

	private void updateProgressBar() {
	if (mPanel.isProgressBarVisible()) {
	mProgressBar.setVisibility(View.VISIBLE);
	} else {
	mProgressBar.setVisibility(View.GONE);
	}
	}

	private void loadAllSlices() {
	mSliceLiveData.clear();
	final List<Uri> sliceUris = mPanel.getSlices();
	mPanelSlicesLoaderCountdownLatch = new PanelSlicesLoaderCountdownLatch(sliceUris.size());

	for (Uri uri : sliceUris) {
	final LiveData<Slice> sliceLiveData = SliceLiveData.fromUri(getActivity(), uri,
	(int type, Throwable source)-> {
	removeSliceLiveData(uri);
	mPanelSlicesLoaderCountdownLatch.markSliceLoaded(uri);
	});

	// Add slice first to make it in order. Will remove it later if there's an error.
	mSliceLiveData.put(uri, sliceLiveData);

	sliceLiveData.observe(getViewLifecycleOwner(), slice -> {

	// If the Slice has already loaded, refresh list with slice data.
	if (mPanelSlicesLoaderCountdownLatch.isSliceLoaded(uri)) {
	if (mAdapter != null) {
	int itemIndex = (new ArrayList<>(mSliceLiveData.keySet())).indexOf(uri);
	mAdapter.notifyItemChanged(itemIndex);
	}
	return;
	}

	/**
	* Watching for the {@link Slice} to load.
	* <p>
	* If the Slice comes back {@code null} or with the Error attribute, if slice
	* uri is not in the allowlist, remove the Slice data from the list, otherwise
	* keep the Slice data.
	* <p>
	* If the Slice has come back fully loaded, then mark the Slice as loaded. No
	* other actions required since we already have the Slice data in the list.
	* <p>
	* If the Slice does not match the above condition, we will still want to mark
	* it as loaded after 250ms timeout to avoid delay showing up the panel for
	* too long. Since we are still having the Slice data in the list, the Slice
	* will show up later once it is loaded.
	*/
	final SliceMetadata metadata = SliceMetadata.from(getActivity(), slice);
	if (slice == null \|\| metadata.isErrorSlice()) {
	removeSliceLiveData(uri);
	mPanelSlicesLoaderCountdownLatch.markSliceLoaded(uri);
	} else if (metadata.getLoadingState() == SliceMetadata.LOADED_ALL) {
	mPanelSlicesLoaderCountdownLatch.markSliceLoaded(uri);
	} else {
	Handler handler = new Handler();
	handler.postDelayed(() -> {
	mPanelSlicesLoaderCountdownLatch.markSliceLoaded(uri);
	loadPanelWhenReady();
	}, DURATION_SLICE_BINDING_TIMEOUT_MS);
	}

	loadPanelWhenReady();
	});
	}
	}

	private void removeSliceLiveData(Uri uri) {
	final List<String> allowList = Arrays.asList(
	getResources().getStringArray(
	R.array.config_panel_keep_observe_uri));
	if (!allowList.contains(uri.toString())) {
	mSliceLiveData.remove(uri);
	}
	}

	/**
	* When all of the Slices have loaded for the first time, then we can setup the
	* {@link RecyclerView}.
	* <p>
	* When the Recyclerview has been laid out, we can begin the animation with the
	* {@link mOnGlobalLayoutListener}, which calls {@link #animateIn()}.
	*/
	private void loadPanelWhenReady() {
	if (mPanelSlicesLoaderCountdownLatch.isPanelReadyToLoad()) {
	mAdapter = new PanelSlicesAdapter(
	this, mSliceLiveData, mPanel.getMetricsCategory());
	mPanelSlices.setAdapter(mAdapter);
	mPanelSlices.getViewTreeObserver()
	.addOnGlobalLayoutListener(mOnGlobalLayoutListener);
	mPanelSlices.setVisibility(View.VISIBLE);

	final FragmentActivity activity = getActivity();
	if (activity == null) {
	return;
	}
	final DividerItemDecoration itemDecoration = new DividerItemDecoration(activity);
	itemDecoration
	.setDividerCondition(DividerItemDecoration.DIVIDER_CONDITION_BOTH);
	if (mPanelSlices.getItemDecorationCount() == 0) {
	mPanelSlices.addItemDecoration(itemDecoration);
	}
	}
	}

	/**
	* Animate a Panel onto the screen.
	* <p>
	* Takes the entire panel and animates in from behind the navigation bar.
	* <p>
	* Relies on the Panel being having a fixed height to begin the animation.
	*/
	private void animateIn() {
	final View panelContent = mLayoutView.findViewById(R.id.panel_container);
	final AnimatorSet animatorSet = buildAnimatorSet(mLayoutView,
	panelContent.getHeight() /* startY /, 0.0f / endY */,
	0.0f /* startAlpha /, 1.0f / endAlpha */,
	DURATION_ANIMATE_PANEL_EXPAND_MS);
	final ValueAnimator animator = new ValueAnimator();
	animator.setFloatValues(0.0f, 1.0f);
	animatorSet.play(animator);
	animatorSet.start();
	// Remove the predraw listeners on the Panel.
	mLayoutView.getViewTreeObserver().removeOnPreDrawListener(mOnPreDrawListener);
	}

	/**
	* Build an {@link AnimatorSet} to animate the Panel, {@param parentView} in or out of the
	* screen, based on the positional parameters {@param startY}, {@param endY}, the parameters
	* for alpha changes {@param startAlpha}, {@param endAlpha}, and the {@param duration} in
	* milliseconds.
	*/
	@NonNull
	private static AnimatorSet buildAnimatorSet(@NonNull View parentView, float startY, float endY,
	float startAlpha, float endAlpha, int duration) {
	final View sheet = parentView.findViewById(R.id.panel_container);
	final AnimatorSet animatorSet = new AnimatorSet();
	animatorSet.setDuration(duration);
	animatorSet.setInterpolator(new DecelerateInterpolator());
	animatorSet.playTogether(
	ObjectAnimator.ofFloat(sheet, View.TRANSLATION_Y, startY, endY),
	ObjectAnimator.ofFloat(sheet, View.ALPHA, startAlpha, endAlpha));
	return animatorSet;
	}

	@Override
	public void onDestroyView() {
	super.onDestroyView();

	if (TextUtils.isEmpty(mPanelClosedKey)) {
	mPanelClosedKey = PanelClosedKeys.KEY_OTHERS;
	}

	if (mLayoutView != null) {
	mLayoutView.getViewTreeObserver().removeOnGlobalLayoutListener(mPanelLayoutListener);
	}
	if (mPanel != null) {
	mMetricsProvider.action(
	0 /* attribution */,
	SettingsEnums.PAGE_HIDE,
	mPanel.getMetricsCategory(),
	mPanelClosedKey,
	0 /* value */);
	}
	}

	@VisibleForTesting
	View.OnClickListener getSeeMoreListener() {
	return (v) -> {
	mPanelClosedKey = PanelClosedKeys.KEY_SEE_MORE;
	final FragmentActivity activity = getActivity();
	if (mPanel.isCustomizedButtonUsed()) {
	mPanel.onClickCustomizedButton(activity);
	} else {
	activity.startActivityForResult(mPanel.getSeeMoreIntent(), 0);
	activity.finish();
	}
	};
	}

	@VisibleForTesting
	View.OnClickListener getCloseListener() {
	return (v) -> {
	mPanelClosedKey = PanelClosedKeys.KEY_DONE;
	getActivity().finish();
	};
	}

	@VisibleForTesting
	View.OnClickListener getHeaderIconListener() {
	return (v) -> {
	final FragmentActivity activity = getActivity();
	activity.startActivity(mPanel.getHeaderIconIntent());
	};
	}

	int getPanelViewType() {
	return mPanel.getViewType();
	}

	class LocalPanelCallback implements PanelContentCallback {

	@Override
	public void onCustomizedButtonStateChanged() {
	ThreadUtils.postOnMainThread(() -> {
	enableCustomizedButton();
	});
	}

	@Override
	public void onHeaderChanged() {
	ThreadUtils.postOnMainThread(() -> {
	enablePanelHeader(mPanel.getIcon(), mPanel.getTitle(), mPanel.getSubTitle());
	});
	}

	@Override
	public void forceClose() {
	mPanelClosedKey = PanelClosedKeys.KEY_OTHERS;
	getFragmentActivity().finish();
	}

	@Override
	public void onTitleChanged() {
	ThreadUtils.postOnMainThread(() -> {
	enableTitle(mPanel.getTitle());
	});
	}

	@Override
	public void onProgressBarVisibleChanged() {
	ThreadUtils.postOnMainThread(() -> {
	updateProgressBar();
	});
	}

	@VisibleForTesting
	FragmentActivity getFragmentActivity() {
	return getActivity();
	}
	}
	}