Example usage for android.view ViewGroup getChildAt

Introduction

In this page you can find the example usage for android.view ViewGroup getChildAt.

Prototype

public View getChildAt(int index) 

Source Link

Document

Returns the view at the specified position in the group.

Usage

From source file:com.miuhouse.yourcompany.student.view.widget.LazyViewPager.java

/**
 * Tests scrollability within child views of v given a delta of dx.
 *
 * @param v/*  www.  j  av  a2 s.com*/
 *            View to test for horizontal scrollability
 * @param checkV
 *            Whether the view v passed should itself be checked for
 *            scrollability (true), or just its children (false).
 * @param dx
 *            Delta scrolled in pixels
 * @param x
 *            X coordinate of the active touch point
 * @param y
 *            Y coordinate of the active touch point
 * @return true if child views of v can be scrolled by delta of dx.
 */
protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {
    if (v instanceof ViewGroup) {
        final ViewGroup group = (ViewGroup) v;
        final int scrollX = v.getScrollX();
        final int scrollY = v.getScrollY();
        final int count = group.getChildCount();
        // Count backwards - let topmost views consume scroll distance
        // first.
        for (int i = count - 1; i >= 0; i--) {
            // This will not work for transformed views in Honeycomb+
            final View child = group.getChildAt(i);
            if (x + scrollX >= child.getLeft() && x + scrollX < child.getRight()
                    && y + scrollY >= child.getTop() && y + scrollY < child.getBottom() && canScroll(child,
                            true, dx, x + scrollX - child.getLeft(), y + scrollY - child.getTop())) {
                return true;
            }
        }
    }

    return checkV && ViewCompat.canScrollHorizontally(v, -dx);
}

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From source file:com.cnpeng.cnpeng_mydemosfrom2016_12.a_12_GetLocalFiles_VP_FM.CustomNoPreLoadViewPager.java

/**
 * Tests scrollability within child views of v given a delta of dx.
 *
 * @param v      View to test for horizontal scrollability
 * @param checkV Whether the view v passed should itself be checked for scrollability (true), or just its children
 *               (false).//ww  w .  j av a2 s . c o  m
 * @param dx     Delta scrolled in pixels
 * @param x      X coordinate of the active touch point
 * @param y      Y coordinate of the active touch point
 * @return true if child views of v can be scrolled by delta of dx.
 */
protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {
    if (v instanceof ViewGroup) {
        final ViewGroup group = (ViewGroup) v;
        final int scrollX = v.getScrollX();
        final int scrollY = v.getScrollY();
        final int count = group.getChildCount();
        // Count backwards - let topmost views consume scroll distance first.  
        for (int i = count - 1; i >= 0; i--) {
            // TODO: Add versioned support here for transformed views.  
            // This will not work for transformed views in Honeycomb+  
            final View child = group.getChildAt(i);
            if (x + scrollX >= child.getLeft() && x + scrollX < child.getRight()
                    && y + scrollY >= child.getTop() && y + scrollY < child.getBottom() && canScroll(child,
                            true, dx, x + scrollX - child.getLeft(), y + scrollY - child.getTop())) {
                return true;
            }
        }
    }

    return checkV && ViewCompat.canScrollHorizontally(v, -dx);
}

---

From source file:me.bemind.sidemenu.SideMenu.java

/**
 * Tests scrollability within child views of v given a delta of dx.
 *
 * @param v View to test for horizontal scrollability
 * @param checkV Whether the view v passed should itself be checked for scrollability (true),
 *               or just its children (false).
 * @param dx Delta scrolled in pixels/*from  ww w  .j a  va2s.  c om*/
 * @param x X coordinate of the active touch point
 * @param y Y coordinate of the active touch point
 * @return true if child views of v can be scrolled by delta of dx.
 */
protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {
    if (v instanceof ViewGroup) {
        final ViewGroup group = (ViewGroup) v;
        final int scrollX = v.getScrollX();
        final int scrollY = v.getScrollY();
        final int count = group.getChildCount();
        // Count backwards - let topmost views consume scroll distance first.
        for (int i = count - 1; i >= 0; i--) {
            // TODO: Add versioned support here for transformed views.
            // This will not work for transformed views in Honeycomb+
            final View child = group.getChildAt(i);
            if (x + scrollX >= child.getLeft() && x + scrollX < child.getRight()
                    && y + scrollY >= child.getTop() && y + scrollY < child.getBottom() && canScroll(child,
                            true, dx, x + scrollX - child.getLeft(), y + scrollY - child.getTop())) {
                return true;
            }
        }
    }

    /* special case ViewPagers, which don't properly implement the scrolling interface */
    return checkV && (ViewCompat.canScrollHorizontally(v, -dx) || draggedChild
            || ((v instanceof ViewPager) && canViewPagerScrollHorizontally((ViewPager) v, -dx)));

    //return checkV && ViewCompat.canScrollHorizontally(v, (isLayoutRtlSupport() ? dx : -dx));
}

---

From source file:android.support.v7.app.AppCompatDelegateImplV7.java

private void ensureSubDecor() {
    if (!mSubDecorInstalled) {
        final LayoutInflater inflater = LayoutInflater.from(mContext);

        if (!mWindowNoTitle) {
            if (mIsFloating) {
                // If we're floating, inflate the dialog title decor
                mSubDecor = (ViewGroup) inflater.inflate(R.layout.abc_dialog_title_material, null);
            } else if (mHasActionBar) {
                /**//from www.  ja  v  a  2 s. co m
                 * This needs some explanation. As we can not use the android:theme attribute
                 * pre-L, we emulate it by manually creating a LayoutInflater using a
                 * ContextThemeWrapper pointing to actionBarTheme.
                 */
                TypedValue outValue = new TypedValue();
                mContext.getTheme().resolveAttribute(R.attr.actionBarTheme, outValue, true);

                Context themedContext;
                if (outValue.resourceId != 0) {
                    themedContext = new ContextThemeWrapper(mContext, outValue.resourceId);
                } else {
                    themedContext = mContext;
                }

                // Now inflate the view using the themed context and set it as the content view
                mSubDecor = (ViewGroup) LayoutInflater.from(themedContext).inflate(R.layout.abc_screen_toolbar,
                        null);

                mDecorContentParent = (DecorContentParent) mSubDecor.findViewById(R.id.decor_content_parent);
                mDecorContentParent.setWindowCallback(getWindowCallback());

                /**
                 * Propagate features to DecorContentParent
                 */
                if (mOverlayActionBar) {
                    mDecorContentParent.initFeature(FEATURE_ACTION_BAR_OVERLAY);
                }
                if (mFeatureProgress) {
                    mDecorContentParent.initFeature(Window.FEATURE_PROGRESS);
                }
                if (mFeatureIndeterminateProgress) {
                    mDecorContentParent.initFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
                }
            }
        } else {
            if (mOverlayActionMode) {
                mSubDecor = (ViewGroup) inflater.inflate(R.layout.abc_screen_simple_overlay_action_mode, null);
            } else {
                mSubDecor = (ViewGroup) inflater.inflate(R.layout.abc_screen_simple, null);
            }

            if (Build.VERSION.SDK_INT >= 21) {
                // If we're running on L or above, we can rely on ViewCompat's
                // setOnApplyWindowInsetsListener
                ViewCompat.setOnApplyWindowInsetsListener(mSubDecor, new OnApplyWindowInsetsListener() {
                    @Override
                    public WindowInsetsCompat onApplyWindowInsets(View v, WindowInsetsCompat insets) {
                        final int top = insets.getSystemWindowInsetTop();
                        final int newTop = updateStatusGuard(top);

                        if (top != newTop) {
                            insets = insets.replaceSystemWindowInsets(insets.getSystemWindowInsetLeft(), newTop,
                                    insets.getSystemWindowInsetRight(), insets.getSystemWindowInsetBottom());
                        }

                        // Now apply the insets on our view
                        return ViewCompat.onApplyWindowInsets(v, insets);
                    }
                });
            } else {
                // Else, we need to use our own FitWindowsViewGroup handling
                ((FitWindowsViewGroup) mSubDecor)
                        .setOnFitSystemWindowsListener(new FitWindowsViewGroup.OnFitSystemWindowsListener() {
                            @Override
                            public void onFitSystemWindows(Rect insets) {
                                insets.top = updateStatusGuard(insets.top);
                            }
                        });
            }
        }

        if (mSubDecor == null) {
            throw new IllegalArgumentException("AppCompat does not support the current theme features");
        }

        if (mDecorContentParent == null) {
            mTitleView = (TextView) mSubDecor.findViewById(R.id.title);
        }

        // Make the decor optionally fit system windows, like the window's decor
        ViewUtils.makeOptionalFitsSystemWindows(mSubDecor);

        final ViewGroup decorContent = (ViewGroup) mWindow.findViewById(android.R.id.content);
        final ViewGroup abcContent = (ViewGroup) mSubDecor.findViewById(R.id.action_bar_activity_content);

        // There might be Views already added to the Window's content view so we need to
        // migrate them to our content view
        while (decorContent.getChildCount() > 0) {
            final View child = decorContent.getChildAt(0);
            decorContent.removeViewAt(0);
            abcContent.addView(child);
        }

        // Now set the Window's content view with the decor
        mWindow.setContentView(mSubDecor);

        // Change our content FrameLayout to use the android.R.id.content id.
        // Useful for fragments.
        decorContent.setId(View.NO_ID);
        abcContent.setId(android.R.id.content);

        // The decorContent may have a foreground drawable set (windowContentOverlay).
        // Remove this as we handle it ourselves
        if (decorContent instanceof FrameLayout) {
            ((FrameLayout) decorContent).setForeground(null);
        }

        // If a title was set before we installed the decor, propogate it now
        CharSequence title = getTitle();
        if (!TextUtils.isEmpty(title)) {
            onTitleChanged(title);
        }

        applyFixedSizeWindow();

        onSubDecorInstalled(mSubDecor);

        mSubDecorInstalled = true;

        // Invalidate if the panel menu hasn't been created before this.
        // Panel menu invalidation is deferred avoiding application onCreateOptionsMenu
        // being called in the middle of onCreate or similar.
        // A pending invalidation will typically be resolved before the posted message
        // would run normally in order to satisfy instance state restoration.
        PanelFeatureState st = getPanelState(FEATURE_OPTIONS_PANEL, false);
        if (!isDestroyed() && (st == null || st.menu == null)) {
            invalidatePanelMenu(FEATURE_ACTION_BAR);
        }
    }
}

---

From source file:cn.bingoogolapple.swipebacklayout.BGASwipeBackLayout.java

/**
 * Tests scrollability within child views of v given a delta of dx.
 *
 * @param v      View to test for horizontal scrollability
 * @param checkV Whether the view v passed should itself be checked for scrollability (true),
 *               or just its children (false).
 * @param dx     Delta scrolled in pixels
 * @param x      X coordinate of the active touch point
 * @param y      Y coordinate of the active touch point
 * @return true if child views of v can be scrolled by delta of dx.
 *///w w  w . ja  va  2 s.  c o  m
protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {
    if (v instanceof ViewGroup) {
        final ViewGroup group = (ViewGroup) v;
        final int scrollX = v.getScrollX();
        final int scrollY = v.getScrollY();
        final int count = group.getChildCount();
        // Count backwards - let topmost views consume scroll distance first.
        for (int i = count - 1; i >= 0; i--) {
            // TODO: Add versioned support here for transformed views.
            // This will not work for transformed views in Honeycomb+
            final View child = group.getChildAt(i);
            if (x + scrollX >= child.getLeft() && x + scrollX < child.getRight()
                    && y + scrollY >= child.getTop() && y + scrollY < child.getBottom() && canScroll(child,
                            true, dx, x + scrollX - child.getLeft(), y + scrollY - child.getTop())) {
                return true;
            }
        }
    }

    return checkV && ViewCompat.canScrollHorizontally(v, (isLayoutRtlSupport() ? dx : -dx));
}

---

From source file:android.car.ui.provider.CarDrawerLayout.java

/**
 * Open the drawer view by animating it into view.
 *///from  w  w  w.  j  a v  a  2s .  c  om
public void openDrawer() {
    ViewGroup drawerView = (ViewGroup) findDrawerView();
    mStartedOpen = false;

    if (hasWindowFocus()) {
        int left;
        LayoutParams drawerLp = (LayoutParams) drawerView.getLayoutParams();
        if (checkDrawerViewAbsoluteGravity(drawerView, Gravity.LEFT)) {
            left = drawerLp.getMarginStart();
        } else {
            left = drawerLp.getMarginStart() + getWidth() - drawerView.getWidth();
        }
        mDragger.smoothSlideViewTo(drawerView, left, drawerView.getTop());
        dispatchOnDrawerOpening(drawerView);
    } else {
        final LayoutParams lp = (LayoutParams) drawerView.getLayoutParams();
        lp.onScreen = 1.f;
        dispatchOnDrawerOpened(drawerView);
    }

    ViewGroup contentView = (ViewGroup) findContentView();
    contentView.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
    drawerView.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);

    View focusable = drawerView.getChildAt(0);
    if (focusable != null) {
        focusable.requestFocus();
    }
    invalidate();
}

---

From source file:com.juick.android.MainActivity.java

private static void restyleViewGroup(ViewGroup view, ColorsTheme.ColorTheme colorTheme, boolean pressed,
        boolean selected, boolean dontBackground) {
    ViewGroup parent = view;
    if (parent.getId() == R.id.navigation_panel)
        return;/*from www  . ja v a 2  s.  co m*/
    int childCount = parent.getChildCount();
    int background = colorTheme.getBackground(pressed);
    int foreground = colorTheme.getForeground(pressed);
    if (selected) {
        background = calculatePressedBackground(background, foreground);
    }
    if (!dontBackground) {
        boolean skipDraw = false;
        if ((view instanceof LinearLayout || view instanceof FrameLayout || view instanceof RelativeLayout)) {
            Context context = view.getContext();
            if (context instanceof MainActivity || context instanceof MessagesActivity
                    || context instanceof ThreadActivity) {
                // no unneeded background in given scrolling activities
                skipDraw = true;
                if (view.getBackground() != null) {
                    // but enable for layouts that with color
                    skipDraw = false;
                }
                if (!skipDraw && view.getClass().getName().toLowerCase().contains("decorview")) {
                    // given activities manage themselves
                    skipDraw = true;
                }
            }
        }
        if (!skipDraw)
            parent.setBackgroundColor(background);
    }
    if (view instanceof ListView)
        dontBackground = true;
    for (int i = 0; i < childCount; i++) {
        View child = parent.getChildAt(i);
        restyleChildrenOrWidget(child, dontBackground);
    }
}

---

From source file:com.chenglong.muscle.ui.LazyViewPager.java

/**
 * Tests scrollability within child views of v given a delta of dx.
 *
 * @param v      View to test for horizontal scrollability
 * @param checkV Whether the view v passed should itself be checked for
 *               scrollability (true), or just its children (false).
 * @param dx     Delta scrolled in pixels
 * @param x      X coordinate of the active touch point
 * @param y      Y coordinate of the active touch point
 * @return true if child views of v can be scrolled by delta of dx.
 *///from   w  ww. j a  va  2 s . c  o  m
protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {
    if (v instanceof ViewGroup) {
        final ViewGroup group = (ViewGroup) v;
        final int scrollX = v.getScrollX();
        final int scrollY = v.getScrollY();
        final int count = group.getChildCount();
        // Count backwards - let topmost views consume scroll distance
        // first.
        for (int i = count - 1; i >= 0; i--) {
            // TODO: Add versioned support here for transformed views.
            // This will not work for transformed views in Honeycomb+
            final View child = group.getChildAt(i);
            if (x + scrollX >= child.getLeft() && x + scrollX < child.getRight()
                    && y + scrollY >= child.getTop() && y + scrollY < child.getBottom() && canScroll(child,
                            true, dx, x + scrollX - child.getLeft(), y + scrollY - child.getTop())) {
                return true;
            }
        }
    }
    return checkV && ViewCompat.canScrollHorizontally(v, -dx);
}

---

From source file:android.transitions.everywhere.Transition.java

/**
 * Recursive method which captures values for an entire view hierarchy,
 * starting at some root view. Transitions without targetIDs will use this
 * method to capture values for all possible views.
 *
 * @param view The view for which to capture values. Children of this View
 * will also be captured, recursively down to the leaf nodes.
 * @param start true if values are being captured in the start scene, false
 * otherwise./*  www  . ja  v a 2  s  .c  o m*/
 */
private void captureHierarchy(View view, boolean start) {
    if (view == null) {
        return;
    }
    int id = view.getId();
    if (mTargetIdExcludes != null && mTargetIdExcludes.contains(id)) {
        return;
    }
    if (mTargetExcludes != null && mTargetExcludes.contains(view)) {
        return;
    }
    if (mTargetTypeExcludes != null && view != null) {
        int numTypes = mTargetTypeExcludes.size();
        for (int i = 0; i < numTypes; ++i) {
            if (mTargetTypeExcludes.get(i).isInstance(view)) {
                return;
            }
        }
    }
    if (view.getParent() instanceof ViewGroup) {
        TransitionValues values = new TransitionValues();
        values.view = view;
        if (start) {
            captureStartValues(values);
        } else {
            captureEndValues(values);
        }
        values.targetedTransitions.add(this);
        capturePropagationValues(values);
        if (start) {
            addViewValues(mStartValues, view, values);
        } else {
            addViewValues(mEndValues, view, values);
        }
    }
    if (view instanceof ViewGroup) {
        // Don't traverse child hierarchy if there are any child-excludes on this view
        if (mTargetIdChildExcludes != null && mTargetIdChildExcludes.contains(id)) {
            return;
        }
        if (mTargetChildExcludes != null && mTargetChildExcludes.contains(view)) {
            return;
        }
        if (mTargetTypeChildExcludes != null) {
            int numTypes = mTargetTypeChildExcludes.size();
            for (int i = 0; i < numTypes; ++i) {
                if (mTargetTypeChildExcludes.get(i).isInstance(view)) {
                    return;
                }
            }
        }
        ViewGroup parent = (ViewGroup) view;
        for (int i = 0; i < parent.getChildCount(); ++i) {
            captureHierarchy(parent.getChildAt(i), start);
        }
    }
}

---

From source file:com.transitionseverywhere.Transition.java

/**
 * Recursive method which captures values for an entire view hierarchy,
 * starting at some root view. Transitions without targetIDs will use this
 * method to capture values for all possible views.
 *
 * @param view The view for which to capture values. Children of this View
 * will also be captured, recursively down to the leaf nodes.
 * @param start true if values are being captured in the start scene, false
 * otherwise./*from   w w w.java 2s  .  c  o m*/
 */
private void captureHierarchy(View view, boolean start) {
    if (view == null) {
        return;
    }
    int id = view.getId();
    if (mTargetIdExcludes != null && mTargetIdExcludes.contains(id)) {
        return;
    }
    if (mTargetExcludes != null && mTargetExcludes.contains(view)) {
        return;
    }
    if (mTargetTypeExcludes != null) {
        int numTypes = mTargetTypeExcludes.size();
        for (int i = 0; i < numTypes; ++i) {
            if (mTargetTypeExcludes.get(i).isInstance(view)) {
                return;
            }
        }
    }
    if (view.getParent() instanceof ViewGroup) {
        TransitionValues values = new TransitionValues();
        values.view = view;
        if (start) {
            captureStartValues(values);
        } else {
            captureEndValues(values);
        }
        values.targetedTransitions.add(this);
        capturePropagationValues(values);
        if (start) {
            addViewValues(mStartValues, view, values);
        } else {
            addViewValues(mEndValues, view, values);
        }
    }
    if (view instanceof ViewGroup) {
        // Don't traverse child hierarchy if there are any child-excludes on this view
        if (mTargetIdChildExcludes != null && mTargetIdChildExcludes.contains(id)) {
            return;
        }
        if (mTargetChildExcludes != null && mTargetChildExcludes.contains(view)) {
            return;
        }
        if (mTargetTypeChildExcludes != null) {
            int numTypes = mTargetTypeChildExcludes.size();
            for (int i = 0; i < numTypes; ++i) {
                if (mTargetTypeChildExcludes.get(i).isInstance(view)) {
                    return;
                }
            }
        }
        ViewGroup parent = (ViewGroup) view;
        for (int i = 0; i < parent.getChildCount(); ++i) {
            captureHierarchy(parent.getChildAt(i), start);
        }
    }
}

---

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