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November 25, 2017 12:20
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Show a Toast which is positioned to the left of a given View. The message in the Toast is the content description of the View.
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| /** | |
| * Shows a {@link Toast} which is positioned to the left of a given {@link View}. | |
| * The message in the {@link Toast} is the content description of the {@link View}. | |
| * <p> | |
| * Much of the code in this method is inspired by <a href="https://stackoverflow.com/a/21026866/1071320">this</a> StackOverflow answer. | |
| */ | |
| private void showContentDescriptionOfViewAsToast(View view) { | |
| // toasts are positioned relative to the decor view and views relative to their parents; | |
| // we have to gather additional data to have a common coordinate system | |
| Rect rect = new Rect(); | |
| getActivity().getWindow().getDecorView().getWindowVisibleDisplayFrame(rect); | |
| int[] viewLocation = new int[2]; | |
| view.getLocationInWindow(viewLocation); | |
| // covert view's absolute position to a position which is relative to the decor view | |
| int viewLeft = viewLocation[0] - rect.left; | |
| int viewTop = viewLocation[1] - rect.top; | |
| Toast toast = Toast.makeText(getContext(), view.getContentDescription(), Toast.LENGTH_SHORT); | |
| int toastHeight = getToastHeight(toast); | |
| int viewHeight = view.getHeight(); | |
| int screenWidthPixels = getResources().getDisplayMetrics().widthPixels; | |
| int horizontalMargin = getResources().getDimensionPixelOffset(R.dimen.view_horizontal_margin); | |
| int toastXOffset = (screenWidthPixels - viewLeft) + horizontalMargin; | |
| int toastYOffset; | |
| if (viewHeight > toastHeight) { | |
| toastYOffset = viewTop + ((viewHeight - toastHeight) / 2); | |
| } else { | |
| toastYOffset = viewTop - ((toastHeight - viewHeight) / 2); | |
| } | |
| toast.setGravity(Gravity.RIGHT | Gravity.TOP, toastXOffset, toastYOffset); | |
| toast.show(); | |
| return true; | |
| } | |
| /** | |
| * @return the measured height of the given {@link Toast}. | |
| */ | |
| private int getToastHeight(Toast toast) { | |
| DisplayMetrics displayMetrics = getResources().getDisplayMetrics(); | |
| int widthMeasureSpec = View.MeasureSpec.makeMeasureSpec(displayMetrics.widthPixels, View.MeasureSpec.UNSPECIFIED); | |
| int heightMeasureSpec = View.MeasureSpec.makeMeasureSpec(displayMetrics.heightPixels, View.MeasureSpec.UNSPECIFIED); | |
| toast.getView().measure(widthMeasureSpec, heightMeasureSpec); | |
| return toast.getView().getMeasuredHeight(); | |
| } |
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