Example usage for android.view ViewGroup setOnHierarchyChangeListener

Introduction

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

Prototype

public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) 

Source Link

Document

Register a callback to be invoked when a child is added to or removed from this view.

Usage

From source file:com.android.launcher2.HideFromAccessibilityHelper.java

private void setImportantForAccessibilityToNoHelper(View v) {
    mPreviousValues.put(v, ViewCompat.getImportantForAccessibility(v));
    ViewCompat.setImportantForAccessibility(v, View.IMPORTANT_FOR_ACCESSIBILITY_NO);

    // Call method on children recursively
    if (v instanceof ViewGroup) {
        ViewGroup vg = (ViewGroup) v;
        vg.setOnHierarchyChangeListener(this);
        for (int i = 0; i < vg.getChildCount(); i++) {
            View child = vg.getChildAt(i);

            if (includeView(child)) {
                setImportantForAccessibilityToNoHelper(child);
            }/* ww  w  . ja v a2  s.  c o  m*/
        }
    }
}

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From source file:com.android.launcher2.HideFromAccessibilityHelper.java

private void restoreImportantForAccessibilityHelper(View v) {
    ViewCompat.setImportantForAccessibility(v, mPreviousValues.get(v));
    mPreviousValues.remove(v);/*  w ww.ja v a  2 s.  co m*/

    // Call method on children recursively
    if (v instanceof ViewGroup) {
        ViewGroup vg = (ViewGroup) v;

        // We assume if a class implements OnHierarchyChangeListener, it listens
        // to changes to any of its children (happens to be the case in Launcher)
        if (vg instanceof OnHierarchyChangeListener) {
            vg.setOnHierarchyChangeListener((OnHierarchyChangeListener) vg);
        } else {
            vg.setOnHierarchyChangeListener(null);
        }
        for (int i = 0; i < vg.getChildCount(); i++) {
            View child = vg.getChildAt(i);
            if (includeView(child)) {
                restoreImportantForAccessibilityHelper(child);
            }
        }
    }
}

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