下面列出了android.view.ViewTreeObserver#addOnGlobalLayoutListener ( ) 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。
public void setTargetView(View target, int distance, Gravity gravity) {
if (!replaceLayout(target)) {
return;
}
final int d = dip2Px(distance);
final Gravity g = gravity;
final View v = target;
ViewTreeObserver vto = getViewTreeObserver();
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
public void onGlobalLayout() {
getViewTreeObserver().removeGlobalOnLayoutListener(this);
calcOffset(getMeasuredWidth(), d, g, v.getMeasuredWidth(), false);
}
});
}
public void onOrientationChange() {
ViewTreeObserver observer = getViewTreeObserver();
observer.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if (lastWidth != getWidth() || lastHeight != getHeight()) {
if (Build.VERSION.SDK_INT < 16) {
getViewTreeObserver().removeGlobalOnLayoutListener(this);
} else {
getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
resizeAllVideo();
}
}
});
}
/**
* It's important to set overflowDescription atribute in styles, so we can grab the reference
* to the overflow icon. Check: res/values/styles.xml
*
* @param activity
* @param colorFilter
*/
private static void setOverflowButtonColor(final Activity activity, final PorterDuffColorFilter colorFilter) {
final String overflowDescription = activity.getString(R.string.abc_action_menu_overflow_description);
final ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView();
final ViewTreeObserver viewTreeObserver = decorView.getViewTreeObserver();
viewTreeObserver.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
final ArrayList<View> outViews = new ArrayList<>();
decorView.findViewsWithText(outViews, overflowDescription,
View.FIND_VIEWS_WITH_CONTENT_DESCRIPTION);
if (outViews.isEmpty()) {
return;
}
ImageView overflow = (ImageView) outViews.get(0);
overflow.setColorFilter(colorFilter);
removeOnGlobalLayoutListener(decorView, this);
}
});
}
private void scrollToTabAfterLayout(final int tabIndex) {
//from http://stackoverflow.com/a/34780589/3697225
if (mTabLayout != null) {
final ViewTreeObserver observer = mTabLayout.getViewTreeObserver();
if (observer.isAlive()) {
observer.dispatchOnGlobalLayout(); // In case a previous call is waiting when this call is made
observer.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
mTabLayout.getViewTreeObserver().removeGlobalOnLayoutListener(this);
mTabLayout.getTabAt(tabIndex).select();
}
});
}
}
}
public CropView(Context context, AttributeSet attrs, int defStyleAttr)
{
super(context, attrs, defStyleAttr);
setScaleType(ScaleType.MATRIX);
mDragScaleDetector = VersionedGestureDetector.newInstance(context, this);
mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener());
mGestureDetector.setOnDoubleTapListener(new DefaultOnDoubleTapListener());
outlinePaint.setAntiAlias(true);
outlinePaint.setColor(highlightColor);
outlinePaint.setStyle(Paint.Style.STROKE);
outlinePaint.setStrokeWidth(dpToPx(OUTLINE_DP));
outsidePaint.setARGB(125, 50, 50, 50);
ViewTreeObserver observer = getViewTreeObserver();
if (null != observer)
{
observer.addOnGlobalLayoutListener(this);
}
}
private void initStickHeaderViewHight() {
final ViewTreeObserver vto = mStickheader.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
mStickHeaderHeight = mStickheader.getMeasuredHeight();
mStickViewHeight = mStickheader.getChildAt(1).getMeasuredHeight();
if (mStickHeaderHeight > 0 && mStickViewHeight > 0) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
mStickheader.getViewTreeObserver().removeOnGlobalLayoutListener(this);
} else {
mStickheader.getViewTreeObserver().removeGlobalOnLayoutListener(this);
}
updateChildViewHight();
}
}
});
}
private void setUpCollapsed(){
collapsingToolbarLayout.setBackgroundColor(bgColor);
collapsingToolbarLayout.setContentScrimColor(bgColor);
collapsingToolbarLayout.setStatusBarScrimColor(colorBurn(bgColor));
final AppBarLayout appbar = (AppBarLayout) findViewById(R.id.app_bar);
ViewTreeObserver vto=collapsingToolbarLayout.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if(Build.VERSION.SDK_INT>=16){
collapsingToolbarLayout.getViewTreeObserver().removeOnGlobalLayoutListener(this);
}else {
collapsingToolbarLayout.getViewTreeObserver().removeGlobalOnLayoutListener(this);
}
float heightDp = getResources().getDisplayMetrics().heightPixels - 48 * getResources().getDisplayMetrics().density;
if (collapsingToolbarLayout.getMeasuredHeight() > heightDp) {
CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) appbar.getLayoutParams();
lp.height = (int) (collapsingToolbarLayout.getMeasuredHeight() + 48 * getResources().getDisplayMetrics().density);
tabLayout.requestLayout();
}
}
});
collapsingToolbarLayout.setCollapsedTitleTextColor(Color.TRANSPARENT);
collapsingToolbarLayout.setExpandedTitleColor(Color.TRANSPARENT);
collapsingToolbarLayout.setOnListener(new MyCollapsingToolbarLayout.OnListener() {
@Override
public void collapsed() {
findViewById(R.id.header).setVisibility(View.INVISIBLE);
collapsingToolbarLayout.setCollapsedTitleTextColor(Color.WHITE);
}
//
@Override
public void expand() {
findViewById(R.id.header).setVisibility(View.VISIBLE);
collapsingToolbarLayout.setCollapsedTitleTextColor(Color.TRANSPARENT);
}
});
}
/**
* 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());
}
public void start(final String path)
{
started = false;
((Activity)getContext()).getWindow().addFlags(WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN);
((Activity)getContext()).getWindow().addFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
// inflate the UI
final LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final LinearLayout view = (LinearLayout) inflater.inflate(R.layout.doc_view, null);
final ViewTreeObserver vto = getViewTreeObserver();
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener()
{
@Override
public void onGlobalLayout()
{
if (!started)
{
findViewById(R.id.tabhost).setVisibility(mShowUI?View.VISIBLE:View.GONE);
findViewById(R.id.footer).setVisibility(mShowUI?View.VISIBLE:View.GONE);
afterFirstLayoutComplete(path);
started = true;
}
}
});
addView(view);
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
WindowManager.LayoutParams params = getWindow().getAttributes();
if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
if (landscape_content.getVisibility() == View.VISIBLE) {
landscape_content.setVisibility(View.GONE);
hideStatusBar();
isPanelShowing_Landscape = false;
}
}
}, 5000);
params.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;
getWindow().setAttributes(params);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
showLandscapePanel();
ViewTreeObserver vto2 = content.getViewTreeObserver();
vto2.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
content.getViewTreeObserver().removeOnGlobalLayoutListener(this);
full_screen_height = content.getHeight();
full_screen_width = content.getWidth();
}
});
currentState = 1;
} else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
params.flags &= (~WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().setAttributes(params);
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
showPortraitPanel();
Display.setLight(this, currentBrighrness, this.getWindow().getAttributes());
full_screen_height = 0;
full_screen_width = 0;
currentState = 0;
}
}
@Override
public void setText(CharSequence text, BufferType type) {
super.setText(text, type);
ViewTreeObserver vto = getViewTreeObserver();
vto.addOnGlobalLayoutListener(this);
}
/**
* Add an OnGlobalLayoutListener for the view.
* This is just a convenience method for using {@code ViewTreeObserver.OnGlobalLayoutListener()}.
* This also handles removing listener when onGlobalLayout is called.
*
* @param view the target view to add global layout listener
* @param runnable runnable to be executed after the view is laid out
*/
public static void addOnGlobalLayoutListener(final View view, final Runnable runnable) {
ViewTreeObserver vto = view.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
view.getViewTreeObserver().removeGlobalOnLayoutListener(this);
} else {
view.getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
runnable.run();
}
});
}
private void addScrollBottomPadding(final View floatingConfirmLayout, final View scrollView) {
final ViewTreeObserver floatingObserver = floatingConfirmLayout.getViewTreeObserver();
floatingObserver.addOnGlobalLayoutListener(() -> {
final int bottomPadding = floatingConfirmLayout.getHeight();
if (scrollView.getPaddingBottom() != bottomPadding) {
scrollView.setPadding(scrollView.getPaddingLeft(), scrollView.getPaddingTop(),
scrollView.getPaddingRight(), bottomPadding);
}
});
}
public PhotoViewAttacher(ImageView imageView) {
mImageView = new WeakReference<ImageView>(imageView);
imageView.setOnTouchListener(this);
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer)
observer.addOnGlobalLayoutListener(this);
// Make sure we using MATRIX Scale Type
setImageViewScaleTypeMatrix(imageView);
if (imageView.isInEditMode()) {
return;
}
// Create Gesture Detectors...
mScaleDragDetector = VersionedGestureDetector.newInstance(
imageView.getContext(), this);
mGestureDetector = new GestureDetector(imageView.getContext(),
new GestureDetector.SimpleOnGestureListener() {
// forward long click listener
@Override
public void onLongPress(MotionEvent e) {
if (null != mLongClickListener) {
mLongClickListener.onLongClick(getImageView());
}
}
});
mGestureDetector.setOnDoubleTapListener(this);
// Finally, update the UI so that we're zoomable
setZoomable(true);
}
public PhotoViewAttacher(ImageView imageView) {
mImageView = new WeakReference<ImageView>(imageView);
imageView.setDrawingCacheEnabled(true);
imageView.setOnTouchListener(this);
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer)
observer.addOnGlobalLayoutListener(this);
// Make sure we using MATRIX Scale Type
setImageViewScaleTypeMatrix(imageView);
if (imageView.isInEditMode()) {
return;
}
// Create Gesture Detectors...
mScaleDragDetector = VersionedGestureDetector.newInstance(
imageView.getContext(), this);
mGestureDetector = new GestureDetector(imageView.getContext(),
new GestureDetector.SimpleOnGestureListener() {
// forward long click listener
@Override
public void onLongPress(MotionEvent e) {
if (null != mLongClickListener) {
mLongClickListener.onLongClick(getImageView());
}
}
});
mGestureDetector.setOnDoubleTapListener(new DefaultOnDoubleTapListener(this));
// Finally, update the UI so that we're zoomable
setZoomable(true);
}
@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();
}
@Override
public void onAttachedToWindow() {
super.onAttachedToWindow();
ViewTreeObserver vto = mLayout.getViewTreeObserver();
vto.addOnGlobalLayoutListener(this);
}
private void setContent(Comment comment) {
txtUsernameAlternate.setText(getContext().getString(R.string.dialog_comment_user_preview_username_alternative,
comment.getUsernameAlternative()));
txtUsername.setText(comment.getUsername());
txtUserHeadline.setText(comment.getUserHeadline());
txtCommentBody.setText(Html.fromHtml(comment.getBody()));
// Modify link clicks on textview
BetterLinkMovementMethod method = BetterLinkMovementMethod.linkify(Linkify.ALL,
txtCommentBody);
method.setOnLinkClickListener(new BetterLinkMovementMethod.OnLinkClickListener() {
@Override
public boolean onClick(TextView textView, String s) {
CustomTabsHelperFragment.open(getOwnerActivity(),
mCustomTabsIntent,
Uri.parse(s),
mCustomTabsFallback);
return true;
}
});
// Set uer image.
String userImageUrl = comment.getUserImageThumbnailUrl();
userImageUrl = ImageUtils.getCustomCommentUserImageThumbnailUrl(userImageUrl,
ScreenUtils.dpToPxInt(getContext(), 44),
ScreenUtils.dpToPxInt(getContext(), 44));
imgViewUser.setImageURI(userImageUrl);
// Hide headline text if headline is empty.
txtUserHeadline.setVisibility(TextUtils.isEmpty(comment.getUserHeadline()) ?
View.GONE : View.VISIBLE);
// Set extra details.
String extraDetails = String.format("%s \u2022 %s",
getContext().getResources().getQuantityString(R.plurals.item_post_details_comment_votes,
comment.getVotes(),
comment.getVotes()),
getContext().getString(getStringResourceIdForTimeUnit(comment.getTimeUnit()),
comment.getTimeAgo()));
txtCommentExtraDetails.setText(extraDetails);
final ViewTreeObserver observer = scrollViewCommentContent.getViewTreeObserver();
observer.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@SuppressLint("LongLogTag")
@Override
public void onGlobalLayout() {
int viewHeight = scrollViewCommentContent.getMeasuredHeight();
int contentHeight = relativeLayoutCommentContent.getHeight();
Logger.d(TAG, "viewHeight: " + viewHeight + " ; contentHeight: " + contentHeight);
if (viewHeight - contentHeight < 0) {
// Scrollable.
Logger.d(TAG, "View is scrollable.");
viewDivider.setVisibility(View.VISIBLE);
relativeLayoutCommentContent.setPadding(0,
0,
0,
ScreenUtils.dpToPxInt(getContext(), 8));
} else {
Logger.d(TAG, "View is not scrollable.");
viewDivider.setVisibility(View.GONE);
relativeLayoutCommentContent.setPadding(0,
0,
0,
0);
}
}
});
}
public PhotoViewAttacher(ImageView imageView, boolean zoomable) {
mImageView = new WeakReference<>(imageView);
imageView.setDrawingCacheEnabled(true);
imageView.setOnTouchListener(this);
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer)
observer.addOnGlobalLayoutListener(this);
// Make sure we using MATRIX Scale Type
setImageViewScaleTypeMatrix(imageView);
if (imageView.isInEditMode()) {
return;
}
// Create Gesture Detectors...
mScaleDragDetector = VersionedGestureDetector.newInstance(
imageView.getContext(), this);
mGestureDetector = new GestureDetector(imageView.getContext(),
new GestureDetector.SimpleOnGestureListener() {
// forward long click listener
@Override
public void onLongPress(MotionEvent e) {
if (null != mLongClickListener) {
mLongClickListener.onLongClick(getImageView());
}
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2,
float velocityX, float velocityY) {
if (mSingleFlingListener != null) {
if (getScale() > DEFAULT_MIN_SCALE) {
return false;
}
if (MotionEventCompat.getPointerCount(e1) > SINGLE_TOUCH
|| MotionEventCompat.getPointerCount(e2) > SINGLE_TOUCH) {
return false;
}
return mSingleFlingListener.onFling(e1, e2, velocityX, velocityY);
}
return false;
}
});
mGestureDetector.setOnDoubleTapListener(new DefaultOnDoubleTapListener(this));
mBaseRotation = 0.0f;
// Finally, update the UI so that we're zoomable
setZoomable(zoomable);
}
public PhotoViewAttacher(ImageView imageView, boolean zoomable) {
mImageView = new WeakReference<>(imageView);
imageView.setDrawingCacheEnabled(true);
imageView.setOnTouchListener(this);
ViewTreeObserver observer = imageView.getViewTreeObserver();
if (null != observer)
observer.addOnGlobalLayoutListener(this);
// Make sure we using MATRIX Scale Type
setImageViewScaleTypeMatrix(imageView);
if (imageView.isInEditMode()) {
return;
}
// Create Gesture Detectors...
mScaleDragDetector = VersionedGestureDetector.newInstance(
imageView.getContext(), this);
mGestureDetector = new GestureDetector(imageView.getContext(),
new GestureDetector.SimpleOnGestureListener() {
// forward long click listener
@Override
public void onLongPress(MotionEvent e) {
if (null != mLongClickListener) {
mLongClickListener.onLongClick(getImageView());
}
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2,
float velocityX, float velocityY) {
if (mSingleFlingListener != null) {
if (getScale() > DEFAULT_MIN_SCALE) {
return false;
}
if (MotionEventCompat.getPointerCount(e1) > SINGLE_TOUCH
|| MotionEventCompat.getPointerCount(e2) > SINGLE_TOUCH) {
return false;
}
return mSingleFlingListener.onFling(e1, e2, velocityX, velocityY);
}
return false;
}
});
mGestureDetector.setOnDoubleTapListener(new DefaultOnDoubleTapListener(this));
mBaseRotation = 0.0f;
// Finally, update the UI so that we're zoomable
setZoomable(zoomable);
}