android.support.v7.widget.RecyclerView.AdapterDataObserver#org.chromium.chrome.browser.ntp.cards.NewTabPageAdapter源码实例Demo

public void init(
        UiConfig uiConfig, ContextMenuManager contextMenuManager, NewTabPageAdapter adapter) {
    mUiConfig = uiConfig;
    mContextMenuManager = contextMenuManager;
    setAdapter(adapter);
}
 

public NewTabPageAdapter getNewTabPageAdapter() {
    return (NewTabPageAdapter) getAdapter();
}
 

public SuggestionsBottomSheetContent(final ChromeActivity activity, final BottomSheet sheet,
        TabModelSelector tabModelSelector, SnackbarManager snackbarManager) {
    Profile profile = Profile.getLastUsedProfile();
    SuggestionsNavigationDelegate navigationDelegate =
            new SuggestionsNavigationDelegateImpl(activity, profile, sheet, tabModelSelector);
    mTileGroupDelegate = new TileGroupDelegateImpl(
            activity, profile, tabModelSelector, navigationDelegate, snackbarManager);
    mSuggestionsUiDelegate = createSuggestionsDelegate(
            profile, navigationDelegate, sheet, activity.getReferencePool());

    mView = LayoutInflater.from(activity).inflate(
            R.layout.suggestions_bottom_sheet_content, null);
    mRecyclerView = (SuggestionsRecyclerView) mView.findViewById(R.id.recycler_view);

    TouchEnabledDelegate touchEnabledDelegate = new TouchEnabledDelegate() {
        @Override
        public void setTouchEnabled(boolean enabled) {
            activity.getBottomSheet().setTouchEnabled(enabled);
        }
    };
    mContextMenuManager =
            new ContextMenuManager(activity, navigationDelegate, touchEnabledDelegate);
    activity.getWindowAndroid().addContextMenuCloseListener(mContextMenuManager);
    mSuggestionsUiDelegate.addDestructionObserver(new DestructionObserver() {
        @Override
        public void onDestroy() {
            activity.getWindowAndroid().removeContextMenuCloseListener(mContextMenuManager);
        }
    });

    UiConfig uiConfig = new UiConfig(mRecyclerView);

    final NewTabPageAdapter adapter = new NewTabPageAdapter(mSuggestionsUiDelegate,
            /* aboveTheFoldView = */ null, uiConfig, OfflinePageBridge.getForProfile(profile),
            mContextMenuManager, mTileGroupDelegate);
    mRecyclerView.init(uiConfig, mContextMenuManager, adapter);

    mBottomSheetObserver = new SuggestionsSheetVisibilityChangeObserver(this, activity) {
        @Override
        public void onSheetOpened() {
            mRecyclerView.scrollToPosition(0);
            adapter.refreshSuggestions();
            mSuggestionsUiDelegate.getEventReporter().onSurfaceOpened();
            mRecyclerView.getScrollEventReporter().reset();

            if (ChromeFeatureList.isEnabled(
                        ChromeFeatureList.CONTEXTUAL_SUGGESTIONS_CAROUSEL)
                    && sheet.getActiveTab() != null) {
                updateContextualSuggestions(sheet.getActiveTab().getUrl());
            }

            super.onSheetOpened();
        }

        @Override
        public void onContentShown() {
            SuggestionsMetrics.recordSurfaceVisible();
        }

        @Override
        public void onContentHidden() {
            SuggestionsMetrics.recordSurfaceHidden();
        }

        @Override
        public void onContentStateChanged(@BottomSheet.SheetState int contentState) {
            if (contentState == BottomSheet.SHEET_STATE_HALF) {
                SuggestionsMetrics.recordSurfaceHalfVisible();
            } else if (contentState == BottomSheet.SHEET_STATE_FULL) {
                SuggestionsMetrics.recordSurfaceFullyVisible();
            }
        }
    };

    mShadowView = (FadingShadowView) mView.findViewById(R.id.shadow);
    mShadowView.init(
            ApiCompatibilityUtils.getColor(mView.getResources(), R.color.toolbar_shadow_color),
            FadingShadow.POSITION_TOP);

    mRecyclerView.addOnScrollListener(new OnScrollListener() {
        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            boolean shadowVisible = mRecyclerView.canScrollVertically(-1);
            mShadowView.setVisibility(shadowVisible ? View.VISIBLE : View.GONE);
        }
    });

    final LocationBar locationBar = (LocationBar) sheet.findViewById(R.id.location_bar);
    mRecyclerView.setOnTouchListener(new View.OnTouchListener() {
        @Override
        @SuppressLint("ClickableViewAccessibility")
        public boolean onTouch(View view, MotionEvent motionEvent) {
            if (locationBar != null && locationBar.isUrlBarFocused()) {
                locationBar.setUrlBarFocus(false);
            }

            // Never intercept the touch event.
            return false;
        }
    });
}