androidx.core.widget.NestedScrollView Java Examples

@Override
protected void onFinishInflate() {
    mBackground = (TransitionDrawable) getBackground();
    mBackground.startTransition(500);

    mBase = this.findViewById(R.id.home_search_layout);
    mCardView = this.findViewById(R.id.home_search_bar);
    NestedScrollView mRecycler = this.findViewById(R.id.home_search_bar_recycler);

    Animation searchBarAnimation = AnimationUtils.loadAnimation(mCardView.getContext(), R.anim.abc_fade_in);
    mCardView.startAnimation(searchBarAnimation);

    mInput = this.findViewById(R.id.home_search_input);

    super.onFinishInflate();
}
 

@NonNull
private FastScroller.ViewHelper getOrCreateViewHelper() {
    if (mViewHelper != null) {
        return mViewHelper;
    }
    if (mView instanceof ViewHelperProvider) {
        return ((ViewHelperProvider) mView).getViewHelper();
    } else if (mView instanceof RecyclerView) {
        return new RecyclerViewHelper((RecyclerView) mView, mPopupTextProvider);
    } else if (mView instanceof NestedScrollView) {
        throw new UnsupportedOperationException("Please use "
                + FastScrollNestedScrollView.class.getSimpleName() + " instead of "
                + NestedScrollView.class.getSimpleName() + "for fast scroll");
    } else if (mView instanceof ScrollView) {
        throw new UnsupportedOperationException("Please use "
                + FastScrollScrollView.class.getSimpleName() + " instead of "
                + ScrollView.class.getSimpleName() + "for fast scroll");
    } else if (mView instanceof WebView) {
        throw new UnsupportedOperationException("Please use "
                + FastScrollWebView.class.getSimpleName() + " instead of "
                + WebView.class.getSimpleName() + "for fast scroll");
    } else {
        throw new UnsupportedOperationException(mView.getClass().getSimpleName()
                + " is not supported for fast scroll");
    }
}
 

/**
 * 通过 NestedScrollView 绘制为 Bitmap
 * @param scrollView {@link NestedScrollView}
 * @param config     {@link Bitmap.Config}
 * @return {@link Bitmap}
 */
public static Bitmap snapshotByNestedScrollView(final NestedScrollView scrollView, final Bitmap.Config config) {
    if (scrollView == null || config == null) return null;
    try {
        View view = scrollView.getChildAt(0);
        int width = view.getWidth();
        int height = view.getHeight();

        Bitmap bitmap = Bitmap.createBitmap(width, height, config);
        Canvas canvas = new Canvas(bitmap);
        canvas.drawColor(BACKGROUND_COLOR);
        scrollView.layout(0, 0, scrollView.getMeasuredWidth(),
                scrollView.getMeasuredHeight());
        scrollView.draw(canvas);
        return bitmap;
    } catch (Exception e) {
        LogPrintUtils.eTag(TAG, e, "snapshotByNestedScrollView");
    }
    return null;
}
 

@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    if (isNewInstance()) {
        mFragmentView = inflater.inflate(R.layout.fragment_web, container, false);
        mFullscreenView = (ViewGroup) mFragmentView.findViewById(R.id.fullscreen);
        mScrollViewContent = (ViewGroup) mFragmentView.findViewById(R.id.scroll_view_content);
        mScrollView = (NestedScrollView) mFragmentView.findViewById(R.id.nested_scroll_view);
        mControls = (ViewSwitcher) mFragmentView.findViewById(R.id.control_switcher);
        mWebView = (WebView) mFragmentView.findViewById(R.id.web_view);
        mButtonRefresh = (ImageButton) mFragmentView.findViewById(R.id.button_refresh);
        mButtonMore = mFragmentView.findViewById(R.id.button_more);
        mButtonNext = mFragmentView.findViewById(R.id.button_next);
        mButtonNext.setEnabled(false);
        mEditText = (EditText) mFragmentView.findViewById(R.id.edittext);
        setUpWebControls(mFragmentView);
        setUpWebView(mFragmentView);
    }
    return mFragmentView;
}
 

/**
 * 滚动到指定位置 ( 有滚动过程 ) - 相对于上次移动的最后位置移动
 * @param view {@link View}
 * @param x    X 轴开始坐标
 * @param y    Y 轴开始坐标
 * @param <T>  泛型
 * @return {@link View}
 */
public static <T extends View> T smoothScrollBy(final T view, final int x, final int y) {
    if (view != null) {
        if (view instanceof NestedScrollView) {
            ((NestedScrollView) view).smoothScrollBy(x, y);
        } else if (view instanceof ScrollView) {
            ((ScrollView) view).smoothScrollBy(x, y);
        } else if (view instanceof HorizontalScrollView) {
            ((HorizontalScrollView) view).smoothScrollBy(x, y);
        } else if (view instanceof RecyclerView) {
            ((RecyclerView) view).smoothScrollBy(x, y);
        } else if (view instanceof ListView) {
            ((ListView) view).smoothScrollBy(y, 200); // PositionScroller.SCROLL_DURATION
        } else if (view instanceof GridView) {
            ((GridView) view).smoothScrollBy(y, 200);
        }
    }
    return view;
}
 

/**
 * Look into the CoordiantorLayout for the {@link BottomSheetBehaviorGoogleMapsLike}
 * @param coordinatorLayout with app:layout_behavior= {@link BottomSheetBehaviorGoogleMapsLike}
 */
private void getBottomSheetBehavior(@NonNull CoordinatorLayout coordinatorLayout) {

    for (int i = 0; i < coordinatorLayout.getChildCount(); i++) {
        View child = coordinatorLayout.getChildAt(i);

        if (child instanceof NestedScrollView) {

            try {
                BottomSheetBehaviorGoogleMapsLike temp = BottomSheetBehaviorGoogleMapsLike.from(child);
                mBottomSheetBehaviorRef = new WeakReference<>(temp);
                break;
            }
            catch (IllegalArgumentException e){}
        }
    }
}
 

/**
 * Look into the CoordiantorLayout for the {@link BottomSheetBehaviorGoogleMapsLike}
 * @param coordinatorLayout with app:layout_behavior= {@link BottomSheetBehaviorGoogleMapsLike}
 */
private void getBottomSheetBehavior(@NonNull CoordinatorLayout coordinatorLayout) {

    for (int i = 0; i < coordinatorLayout.getChildCount(); i++) {
        View child = coordinatorLayout.getChildAt(i);

        if (child instanceof NestedScrollView) {

            try {
                BottomSheetBehaviorGoogleMapsLike temp = BottomSheetBehaviorGoogleMapsLike.from(child);
                mBottomSheetBehaviorRef = new WeakReference<>(temp);
                break;
            }
            catch (IllegalArgumentException e){}
        }
    }
}
 

/**
 * Initialize nested scroll view fields so that we can access them via reflection.
 */
private static void initializeNestedScrollViewFields() {
    if (F_NESTED_SCROLL_VIEW_EDGE_GLOW_TOP != null
            && F_NESTED_SCROLL_VIEW_EDGE_GLOW_BOTTOM != null) {
        F_NESTED_SCROLL_VIEW_EDGE_GLOW_TOP.setAccessible(true);
        F_NESTED_SCROLL_VIEW_EDGE_GLOW_BOTTOM.setAccessible(true);

        return;
    }

    Class<?> clazz = NestedScrollView.class;
    for (Field field : clazz.getDeclaredFields()) {
        switch (field.getName()) {
            case "mEdgeGlowTop":
                field.setAccessible(true);
                F_NESTED_SCROLL_VIEW_EDGE_GLOW_TOP = field;
                break;
            case "mEdgeGlowBottom":
                field.setAccessible(true);
                F_NESTED_SCROLL_VIEW_EDGE_GLOW_BOTTOM = field;
                break;
        }
    }
}
 

/**
 * Look into the CoordiantorLayout for the {@link BottomSheetBehaviorGoogleMapsLike}
 * @param coordinatorLayout with app:layout_behavior= {@link BottomSheetBehaviorGoogleMapsLike}
 */
private void getBottomSheetBehavior(@NonNull CoordinatorLayout coordinatorLayout) {

    for (int i = 0; i < coordinatorLayout.getChildCount(); i++) {
        View child = coordinatorLayout.getChildAt(i);

        if (child instanceof NestedScrollView) {

            try {
                BottomSheetBehaviorGoogleMapsLike temp = BottomSheetBehaviorGoogleMapsLike.from(child);
                mBottomSheetBehaviorRef = new WeakReference<>(temp);
                break;
            }
            catch (IllegalArgumentException e){}
        }
    }
}
 

/**
 * Look into the CoordiantorLayout for the {@link BottomSheetBehaviorGoogleMapsLike}
 * @param coordinatorLayout with app:layout_behavior= {@link BottomSheetBehaviorGoogleMapsLike}
 */
private void getBottomSheetBehavior(@NonNull CoordinatorLayout coordinatorLayout) {

    for (int i = 0; i < coordinatorLayout.getChildCount(); i++) {
        View child = coordinatorLayout.getChildAt(i);

        if (child instanceof NestedScrollView) {

            try {
                BottomSheetBehaviorGoogleMapsLike temp = BottomSheetBehaviorGoogleMapsLike.from(child);
                mBottomSheetBehaviorRef = new WeakReference<>(temp);
                break;
            }
            catch (IllegalArgumentException e){}
        }
    }
}
 

private ViewTooltip(MyContext myContext, View view) {
    this.view = view;
    this.tooltip_view = new TooltipView(myContext.getContext());
    final NestedScrollView scrollParent = findScrollParent(view);
    if (scrollParent != null) {
        scrollParent.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
            @Override
            public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
                tooltip_view.setTranslationY(tooltip_view.getTranslationY() - (scrollY - oldScrollY));
            }
        });
    }
}
 

private ViewTooltip(MyContext myContext, View rootView, View view) {
    this.rootView = rootView;
    this.view = view;
    this.tooltip_view = new TooltipView(myContext.getContext());
    final NestedScrollView scrollParent = findScrollParent(view);
    if (scrollParent != null) {
        scrollParent.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
            @Override
            public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
                tooltip_view.setTranslationY(tooltip_view.getTranslationY() - (scrollY - oldScrollY));
            }
        });
    }
}
 

private NestedScrollView findScrollParent(View view) {
    if (view.getParent() == null || !(view.getParent() instanceof View)) {
        return null;
    } else if (view.getParent() instanceof NestedScrollView) {
        return ((NestedScrollView) view.getParent());
    } else {
        return findScrollParent(((View) view.getParent()));
    }
}
 

@Override
public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {
    if (dependency instanceof NestedScrollView) {
        try {
            BottomSheetBehaviorGoogleMapsLike.from(dependency);
            return true;
        }
        catch (IllegalArgumentException e){}
    }
    return false;
}
 

@Override
public boolean layoutDependsOn(CoordinatorLayout parent, FloatingActionButton child, View dependency) {
    if (dependency instanceof NestedScrollView) {
        try {
            BottomSheetBehaviorGoogleMapsLike.from(dependency);
            return true;
        }
        catch (IllegalArgumentException e){}
    }
    return false;
}
 

@Override
public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {
    if (dependency instanceof NestedScrollView) {
        try {
            BottomSheetBehaviorGoogleMapsLike.from(dependency);
            return true;
        }
        catch (IllegalArgumentException e){}
    }
    return false;
}
 

@Override
public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {
    if (dependency instanceof NestedScrollView) {
        try {
            BottomSheetBehaviorGoogleMapsLike.from(dependency);
            return true;
        }
        catch (IllegalArgumentException e){}
    }
    return false;
}
 

public static boolean isScrollableView(View mView) {
    return mView instanceof ScrollView
            || mView instanceof HorizontalScrollView
            || mView instanceof NestedScrollView
            || mView instanceof AbsListView
            || mView instanceof RecyclerView
            || mView instanceof ViewPager
            || mView instanceof WebView;
}
 

@Test
@SmallTest
public void testFindScrollingChildEnabled() {
  Context context = activityTestRule.getActivity();
  NestedScrollView disabledParent = new NestedScrollView(context);
  disabledParent.setNestedScrollingEnabled(false);
  NestedScrollView enabledChild = new NestedScrollView(context);
  enabledChild.setNestedScrollingEnabled(true);
  disabledParent.addView(enabledChild);

  View scrollingChild = getBehavior().findScrollingChild(disabledParent);
  assertThat(scrollingChild, is((View) enabledChild));
}
 

@Config(shadows = ShadowNestedScrollView.class)
@Test
public void testScrollToTop() {
    NestedScrollView scrollView = activity.findViewById(R.id.nested_scroll_view);
    scrollView.smoothScrollTo(0, 1);
    assertThat(customShadowOf(scrollView).getSmoothScrollY()).isEqualTo(1);
    activity.fragment.scrollToTop();
    assertThat(customShadowOf(scrollView).getSmoothScrollY()).isEqualTo(0);

}
 

@Config(shadows = ShadowNestedScrollView.class)
@Test
public void testScroll() {
    ShadowNestedScrollView shadowScrollView =
            customShadowOf((NestedScrollView) activity.findViewById(R.id.nested_scroll_view));
    WebFragment fragment = (WebFragment) activity.getSupportFragmentManager()
            .findFragmentByTag(WebFragment.class.getName());
    fragment.scrollToNext();
    assertThat(shadowScrollView.getLastScrollDirection()).isEqualTo(View.FOCUS_DOWN);
    fragment.scrollToPrevious();
    assertThat(shadowScrollView.getLastScrollDirection()).isEqualTo(View.FOCUS_UP);
    fragment.scrollToTop();
    assertThat(shadowScrollView.getSmoothScrollY()).isEqualTo(0);
}
 

@Override
public boolean dispatchTouchEvent(@NonNull MotionEvent ev) {
    Float y = ev.getY();
    NestedScrollView v = this.findViewById(R.id.contacts_nested);

    switch (ev.getActionMasked()) {
        case MotionEvent.ACTION_DOWN:
            mInitialMotionY = y;
            break;
        case MotionEvent.ACTION_MOVE:
            break;
        case MotionEvent.ACTION_UP:
            double dy = mInitialMotionY - y;
            if (dy > 0) {
                if (mDragOffset < 0.5 && !scrollActive) {
                    smoothSlideTo(0.f);
                    scrollActive = true;
                    mStatusBar.setVisibility(View.VISIBLE);
                    mStatusBar.bringToFront();
                    scrollTop = v.getBottom();
                }
            } else {
                if (!scrollActive && Math.abs(dy) > 20) {
                    if (mDragOffset > 0.5f) {
                        finish();
                    } else {
                        smoothSlideTo(0.5f);
                        mStatusBar.setVisibility(View.INVISIBLE);
                    }
                } else {
                    if (v.getBottom() >= scrollTop) {
                        scrollActive = false;
                    }
                }
            }
    }
    return super.dispatchTouchEvent(ev);
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (mCustomContentViewId != 0)
        setContentView(mCustomContentViewId);
    else
        setContentView(R.layout.activity_setup_big_header);

    AppBarLayout appBar = findViewById(R.id.appbar);

    CollapsingToolbarLayout toolbarLayout = findViewById(R.id.toolbar_layout);

    Toolbar toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    mLayout = findViewById(R.id.layout);
    mLayout.getViewTreeObserver().addOnGlobalLayoutListener(() -> {
        int height = mLayout.getHeight();
        CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams)
                appBar.getLayoutParams();
        params.height = height / 3;
        appBar.setLayoutParams(params);

        int childHeight = (mContentView != null ? mContentView.getHeight() : 0);
        if (mContentView instanceof NestedScrollView)
            childHeight = ((NestedScrollView) mContentView).getChildAt(0).getHeight();
        boolean needsScroll = (mContentView != null && childHeight > height - params.height);

        AppBarLayout.LayoutParams paramsToolbar = (AppBarLayout.LayoutParams) toolbarLayout.getLayoutParams();
        paramsToolbar.setScrollFlags(needsScroll
                ? (AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED)
                : 0);
        toolbarLayout.setLayoutParams(paramsToolbar);
    });
}
 

@Override
public void onScrollChange(NestedScrollView view, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
    if (scrollY == 0) {
        mCanScroll = false;
    } else {
        mCanScroll = true;
    }
}
 

@Override
public final View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    if (payload == null) {
        dismissAllowingStateLoss();
        return null;
    }

    LayoutInflater themedInflater = createLayoutInflater(requireContext(), payload);
    if (themedInflater != null) inflater = themedInflater;

    layout = (CoordinatorLayout) inflater.inflate(R.layout.modal_bottom_sheet, container, false);
    layout.addOnLayoutChangeListener((v, left, top, right, bottom, oldLeft, oldTop, oldRight, oldBottom) -> {
        if ((oldTop != top || oldBottom != bottom) && behavior != null) heightChanged();
    });

    header = layout.findViewById(R.id.modalBottomSheet_header);
    body = layout.findViewById(R.id.modalBottomSheet_body);
    loading = layout.findViewById(R.id.modalBottomSheet_loading);
    action = layout.findViewById(R.id.modalBottomSheet_action);

    onCreateHeader(inflater, header, payload);
    onCreateBody(inflater, body, payload);

    NestedScrollView scrollable = layout.findViewById(R.id.modalBottomSheet_scrollable);
    scrollable.setVisibility(hasBody ? View.VISIBLE : View.GONE);

    FrameLayout bodyNoScroll = layout.findViewById(R.id.modalBottomSheet_bodyNoScroll);
    hasNoScroll = onCreateNoScrollBody(inflater, bodyNoScroll, payload);
    bodyNoScroll.setVisibility(hasNoScroll ? View.VISIBLE : View.GONE);

    if (!hasBody && !hasNoScroll)
        throw new IllegalStateException();

    invalidateAction();
    header.setCloseOnClickListener(v -> dismiss());

    return layout;
}
 

/**
 * 滚动到指定位置 ( 有滚动过程 ) - 相对于初始位置移动
 * @param view {@link View}
 * @param x    X 轴开始坐标
 * @param y    Y 轴开始坐标
 * @param <T>  泛型
 * @return {@link View}
 */
public static <T extends View> T smoothScrollTo(final T view, final int x, final int y) {
    if (view != null) {
        if (view instanceof NestedScrollView) {
            ((NestedScrollView) view).smoothScrollTo(x, y);
        } else if (view instanceof ScrollView) {
            ((ScrollView) view).smoothScrollTo(x, y);
        } else if (view instanceof HorizontalScrollView) {
            ((HorizontalScrollView) view).smoothScrollTo(x, y);
        }
    }
    return view;
}
 

/**
 * 滚动方向 ( 有滚动过程 )
 * @param view      {@link View}
 * @param direction 滚动方向 如: View.FOCUS_UP、View.FOCUS_DOWN
 * @param <T>       泛型
 * @return {@link View}
 */
public static <T extends View> T fullScroll(final T view, final int direction) {
    if (view != null) {
        if (view instanceof NestedScrollView) {
            ((NestedScrollView) view).fullScroll(direction);
        } else if (view instanceof ScrollView) {
            ((ScrollView) view).fullScroll(direction);
        } else if (view instanceof HorizontalScrollView) {
            ((HorizontalScrollView) view).fullScroll(direction);
        }
    }
    return view;
}
 

/**
 * Set edge effect or glow color for nested scroll view.
 *
 * @param nestedScrollView The nested scroll view to set the edge effect color.
 * @param color The edge effect color to be set.
 */
public static void setEdgeEffectColor(
        @NonNull NestedScrollView nestedScrollView, @ColorInt int color) {
    initializeNestedScrollViewFields();

    try {
        Object edgeEffect =
                F_NESTED_SCROLL_VIEW_EDGE_GLOW_TOP.get(nestedScrollView);
        setEdgeEffectColor(edgeEffect, color);
        edgeEffect =
                F_NESTED_SCROLL_VIEW_EDGE_GLOW_BOTTOM.get(nestedScrollView);
        setEdgeEffectColor(edgeEffect, color);
    } catch (Exception ignored) {
    }
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_web_detail);
    ButterKnife.bind(this);

    backupRendType = GSYVideoType.getRenderType();

    //设置为Surface播放模式，注意此设置是全局的
    GSYVideoType.setRenderType(GSYVideoType.SUFRACE);

    resolveNormalVideoUI();

    initVideoBuilderMode();


    webPlayer.setLockClickListener(new LockClickListener() {
        @Override
        public void onClick(View view, boolean lock) {
            if (orientationUtils != null) {
                //配合下方的onConfigurationChanged
                orientationUtils.setEnable(!lock);
                webPlayer.getCurrentPlayer().setRotateViewAuto(!lock);
            }
        }
    });


    WebSettings settings = webView.getSettings();
    settings.setJavaScriptEnabled(true);
    webView.loadUrl("https://www.baidu.com");


    orientationUtils.setRotateWithSystem(false);

    webTopLayout.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
        @Override
        public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
            if (!webPlayer.isIfCurrentIsFullscreen() && scrollY >= 0 && isPlay) {
                if (scrollY > webPlayer.getHeight()) {
                    //如果是小窗口就不需要处理
                    if (!isSmall) {
                        isSmall = true;
                        int size = CommonUtil.dip2px(WebDetailActivity.this, 150);
                        webPlayer.showSmallVideo(new Point(size, size), true, true);
                        orientationUtils.setEnable(false);
                    }
                } else {
                    if (isSmall) {
                        isSmall = false;
                        orientationUtils.setEnable(true);
                        //必须
                        webTopLayoutVideo.postDelayed(new Runnable() {
                            @Override
                            public void run() {
                                webPlayer.hideSmallVideo();
                            }
                        }, 50);
                    }
                }
                webTopLayoutVideo.setTranslationY((scrollY <= webTopLayoutVideo.getHeight()) ? -scrollY : -webTopLayoutVideo.getHeight());
            }
        }
    });

}
 

void onScrollChanged(NestedScrollView who, int l, int t, int oldl,
int oldt);