android.view.ViewTreeObserver#addOnScrollChangedListener ( )源码实例Demo

下面列出了android.view.ViewTreeObserver#addOnScrollChangedListener ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。

源代码1 项目： android_9.0.0_r45 文件： PopupWindow.java

/** @hide */
protected void attachToAnchor(View anchor, int xoff, int yoff, int gravity) {
    detachFromAnchor();

    final ViewTreeObserver vto = anchor.getViewTreeObserver();
    if (vto != null) {
        vto.addOnScrollChangedListener(mOnScrollChangedListener);
    }
    anchor.addOnAttachStateChangeListener(mOnAnchorDetachedListener);

    final View anchorRoot = anchor.getRootView();
    anchorRoot.addOnAttachStateChangeListener(mOnAnchorRootDetachedListener);
    anchorRoot.addOnLayoutChangeListener(mOnLayoutChangeListener);

    mAnchor = new WeakReference<>(anchor);
    mAnchorRoot = new WeakReference<>(anchorRoot);
    mIsAnchorRootAttached = anchorRoot.isAttachedToWindow();
    mParentRootView = mAnchorRoot;

    mAnchorXoff = xoff;
    mAnchorYoff = yoff;
    mAnchoredGravity = gravity;
}

源代码2 项目： CSipSimple 文件： PopupWindowCompat.java

private void registerListener(View anchor) {
    // Don't do anything if we haven't managed to patch the super listener.
    // And don't bother attaching the listener if the anchor view isn't
    // attached. This means we'll only have to deal with the real VTO owned
    // by the ViewRoot.
    if (mSuperScrollListener != null) {
        ViewTreeObserver vto = (anchor.getWindowToken() != null) ? anchor.getViewTreeObserver()
                : null;
        if (vto != mViewTreeObserver) {
            if (mViewTreeObserver != null && mViewTreeObserver.isAlive()) {
                mViewTreeObserver.removeOnScrollChangedListener(mSuperScrollListener);
            }
            if ((mViewTreeObserver = vto) != null) {
                vto.addOnScrollChangedListener(mSuperScrollListener);
            }
        }
    }
}

源代码3 项目： Yahala-Messenger 文件： ActionBarPopupWindow.java

private void registerListener(View anchor) {
    // Don't do anything if we haven't managed to patch the super listener.
    // And don't bother attaching the listener if the anchor view isn't
    // attached. This means we'll only have to deal with the real VTO owned
    // by the ViewRoot.
    if (mSuperScrollListener != null) {
        ViewTreeObserver vto = (anchor.getWindowToken() != null) ? anchor.getViewTreeObserver()
                : null;
        if (vto != mViewTreeObserver) {
            if (mViewTreeObserver != null && mViewTreeObserver.isAlive()) {
                mViewTreeObserver.removeOnScrollChangedListener(mSuperScrollListener);
            }
            if ((mViewTreeObserver = vto) != null) {
                vto.addOnScrollChangedListener(mSuperScrollListener);
            }
        }
    }
}

源代码4 项目： zen4android 文件： PopupWindowCompat.java

private void registerListener(View anchor) {
    // Don't do anything if we haven't managed to patch the super listener.
    // And don't bother attaching the listener if the anchor view isn't
    // attached. This means we'll only have to deal with the real VTO owned
    // by the ViewRoot.
    if (mSuperScrollListener != null) {
        ViewTreeObserver vto = (anchor.getWindowToken() != null) ? anchor.getViewTreeObserver()
                : null;
        if (vto != mViewTreeObserver) {
            if (mViewTreeObserver != null && mViewTreeObserver.isAlive()) {
                mViewTreeObserver.removeOnScrollChangedListener(mSuperScrollListener);
            }
            if ((mViewTreeObserver = vto) != null) {
                vto.addOnScrollChangedListener(mSuperScrollListener);
            }
        }
    }
}

源代码5 项目： zhangshangwuda 文件： PopupWindowCompat.java

private void registerListener(View anchor) {
    // Don't do anything if we haven't managed to patch the super listener.
    // And don't bother attaching the listener if the anchor view isn't
    // attached. This means we'll only have to deal with the real VTO owned
    // by the ViewRoot.
    if (mSuperScrollListener != null) {
        ViewTreeObserver vto = (anchor.getWindowToken() != null) ? anchor.getViewTreeObserver()
                : null;
        if (vto != mViewTreeObserver) {
            if (mViewTreeObserver != null && mViewTreeObserver.isAlive()) {
                mViewTreeObserver.removeOnScrollChangedListener(mSuperScrollListener);
            }
            if ((mViewTreeObserver = vto) != null) {
                vto.addOnScrollChangedListener(mSuperScrollListener);
            }
        }
    }
}

源代码6 项目： Libraries-for-Android-Developers 文件： PopupWindowCompat.java

private void registerListener(View anchor) {
    // Don't do anything if we haven't managed to patch the super listener.
    // And don't bother attaching the listener if the anchor view isn't
    // attached. This means we'll only have to deal with the real VTO owned
    // by the ViewRoot.
    if (mSuperScrollListener != null) {
        ViewTreeObserver vto = (anchor.getWindowToken() != null) ? anchor.getViewTreeObserver()
                : null;
        if (vto != mViewTreeObserver) {
            if (mViewTreeObserver != null && mViewTreeObserver.isAlive()) {
                mViewTreeObserver.removeOnScrollChangedListener(mSuperScrollListener);
            }
            if ((mViewTreeObserver = vto) != null) {
                vto.addOnScrollChangedListener(mSuperScrollListener);
            }
        }
    }
}

源代码7 项目： TelePlus-Android 文件： ActionBarPopupWindow.java

private void registerListener(View anchor) {
    if (mSuperScrollListener != null) {
        ViewTreeObserver vto = (anchor.getWindowToken() != null) ? anchor.getViewTreeObserver() : null;
        if (vto != mViewTreeObserver) {
            if (mViewTreeObserver != null && mViewTreeObserver.isAlive()) {
                mViewTreeObserver.removeOnScrollChangedListener(mSuperScrollListener);
            }
            if ((mViewTreeObserver = vto) != null) {
                vto.addOnScrollChangedListener(mSuperScrollListener);
            }
        }
    }
}

源代码8 项目： TelePlus-Android 文件： EmojiView.java

private void registerListener(View anchor) {
    if (mSuperScrollListener != null) {
        ViewTreeObserver vto = (anchor.getWindowToken() != null) ? anchor.getViewTreeObserver() : null;
        if (vto != mViewTreeObserver) {
            if (mViewTreeObserver != null && mViewTreeObserver.isAlive()) {
                mViewTreeObserver.removeOnScrollChangedListener(mSuperScrollListener);
            }
            if ((mViewTreeObserver = vto) != null) {
                vto.addOnScrollChangedListener(mSuperScrollListener);
            }
        }
    }
}

源代码9 项目： TelePlus-Android 文件： ActionBarPopupWindow.java

private void registerListener(View anchor) {
    if (mSuperScrollListener != null) {
        ViewTreeObserver vto = (anchor.getWindowToken() != null) ? anchor.getViewTreeObserver() : null;
        if (vto != mViewTreeObserver) {
            if (mViewTreeObserver != null && mViewTreeObserver.isAlive()) {
                mViewTreeObserver.removeOnScrollChangedListener(mSuperScrollListener);
            }
            if ((mViewTreeObserver = vto) != null) {
                vto.addOnScrollChangedListener(mSuperScrollListener);
            }
        }
    }
}

源代码10 项目： TelePlus-Android 文件： EmojiView.java

private void registerListener(View anchor) {
    if (mSuperScrollListener != null) {
        ViewTreeObserver vto = (anchor.getWindowToken() != null) ? anchor.getViewTreeObserver() : null;
        if (vto != mViewTreeObserver) {
            if (mViewTreeObserver != null && mViewTreeObserver.isAlive()) {
                mViewTreeObserver.removeOnScrollChangedListener(mSuperScrollListener);
            }
            if ((mViewTreeObserver = vto) != null) {
                vto.addOnScrollChangedListener(mSuperScrollListener);
            }
        }
    }
}

源代码11 项目： KrGallery 文件： ActionBarPopupWindow.java

private void registerListener(View anchor) {
    if (mSuperScrollListener != null) {
        ViewTreeObserver vto = (anchor.getWindowToken() != null) ? anchor.getViewTreeObserver() : null;
        if (vto != mViewTreeObserver) {
            if (mViewTreeObserver != null && mViewTreeObserver.isAlive()) {
                mViewTreeObserver.removeOnScrollChangedListener(mSuperScrollListener);
            }
            if ((mViewTreeObserver = vto) != null) {
                vto.addOnScrollChangedListener(mSuperScrollListener);
            }
        }
    }
}

源代码12 项目： sa-sdk-android 文件： AppActivityLifecycleCallbacks.java

/**
 * 注册 ViewTreeObserver
 */
private void registerViewTreeObserver(Activity activity) {
    ViewTreeObserver viewTreeObserver = activity.getWindow().getDecorView().getViewTreeObserver();
    viewTreeObserver.addOnGlobalFocusChangeListener(AppViewTreeObserver.getInstance());
    viewTreeObserver.addOnGlobalLayoutListener(AppViewTreeObserver.getInstance());
    viewTreeObserver.addOnScrollChangedListener(AppViewTreeObserver.getInstance());
}

源代码13 项目： ParallaxEverywhere 文件： PEWTextView.java

@Override
protected void onAttachedToWindow() {
    super.onAttachedToWindow();

    mOnScrollChangedListener = new ViewTreeObserver.OnScrollChangedListener() {
        @Override
        public void onScrollChanged() {
            applyParallax();
        }
    };

    mOnGlobalLayoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            heightView = (float) getHeight();
            widthView = (float) getWidth();

            applyParallax();
        }
    };

    ViewTreeObserver viewTreeObserver = getViewTreeObserver();
    viewTreeObserver.addOnScrollChangedListener(mOnScrollChangedListener);
    viewTreeObserver.addOnGlobalLayoutListener(mOnGlobalLayoutListener);

    if (updateOnDraw
            && android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
        onDrawListener = new ViewTreeObserver.OnDrawListener() {
            @Override
            public void onDraw() {
                applyParallax();
            }
        };
        viewTreeObserver.addOnDrawListener(onDrawListener);
    }

    parallaxAnimation();
}

源代码14 项目： ParallaxEverywhere 文件： PEWImageView.java

@Override
protected void onAttachedToWindow() {
    super.onAttachedToWindow();

    mOnScrollChangedListener = new ViewTreeObserver.OnScrollChangedListener() {
        @Override
        public void onScrollChanged() {
            applyParallax();
        }
    };

    mOnGlobalLayoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            heightImageView = (float) getHeight();
            widthImageView = (float) getWidth();

            applyParallax();
        }
    };

    ViewTreeObserver viewTreeObserver = getViewTreeObserver();
    viewTreeObserver.addOnScrollChangedListener(mOnScrollChangedListener);
    viewTreeObserver.addOnGlobalLayoutListener(mOnGlobalLayoutListener);

    if (updateOnDraw
            && android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
        onDrawListener = new ViewTreeObserver.OnDrawListener() {
            @Override
            public void onDraw() {
                applyParallax();
            }
        };
        viewTreeObserver.addOnDrawListener(onDrawListener);
    }

    parallaxAnimation();
}

源代码15 项目： Telegram-FOSS 文件： ActionBarPopupWindow.java

private void registerListener(View anchor) {
    if (mSuperScrollListener != null) {
        ViewTreeObserver vto = (anchor.getWindowToken() != null) ? anchor.getViewTreeObserver() : null;
        if (vto != mViewTreeObserver) {
            if (mViewTreeObserver != null && mViewTreeObserver.isAlive()) {
                mViewTreeObserver.removeOnScrollChangedListener(mSuperScrollListener);
            }
            if ((mViewTreeObserver = vto) != null) {
                vto.addOnScrollChangedListener(mSuperScrollListener);
            }
        }
    }
}

源代码16 项目： Telegram 文件： ActionBarPopupWindow.java

private void registerListener(View anchor) {
    if (mSuperScrollListener != null) {
        ViewTreeObserver vto = (anchor.getWindowToken() != null) ? anchor.getViewTreeObserver() : null;
        if (vto != mViewTreeObserver) {
            if (mViewTreeObserver != null && mViewTreeObserver.isAlive()) {
                mViewTreeObserver.removeOnScrollChangedListener(mSuperScrollListener);
            }
            if ((mViewTreeObserver = vto) != null) {
                vto.addOnScrollChangedListener(mSuperScrollListener);
            }
        }
    }
}

源代码17 项目： mobile-sdk-android 文件： AdWebView.java

private void setupViewTreeObserver() {
    ViewTreeObserver treeObserver = getViewTreeObserver();
    if (treeObserver.isAlive()) {
        treeObserver.removeOnScrollChangedListener(this);
        treeObserver.removeGlobalOnLayoutListener(this);

        treeObserver.addOnScrollChangedListener(this);
        treeObserver.addOnGlobalLayoutListener(this);
    }
}

源代码18 项目： px-android 文件： ReviewAndConfirmActivity.java

private void addScrollListener(final View floatingConfirmLayout, final ViewGroup scrollView) {
    final ViewTreeObserver viewTreeObserver = scrollView.getViewTreeObserver();
    viewTreeObserver.addOnScrollChangedListener(
        () -> resolveFloatingButtonElevationVisibility(floatingConfirmLayout, scrollView));
}

源代码19 项目： material-components-android 文件： InterpolateOnScrollPositionChangeHelper.java

/**
 * Start listening for scroll changes and interpolating based on position.
 *
 * @param viewTreeObserver {@link ViewTreeObserver belonging to the {@link View} being
 * interpolated.
 */
public void startListeningForScrollChanges(@NonNull ViewTreeObserver viewTreeObserver) {
  viewTreeObserver.addOnScrollChangedListener(scrollChangedListener);
}

方法所在类

android.view.ViewTreeObserver