I want to make some works typed inside BasicTextField highlighted to appear like a mention.
But I don't have any glue to make, especially with this bug that is still not fixed
https://issuetracker.google.com/issues/199768107?pli=1
Any ideas, please ?
I am trying to create a single line text input in Jetpack Compose.
Since this input should have a fix width of 200.dp and is only one line, longer text is going to be cut off. Sometimes it looks like the cut off text does not even exist because the cut is made between two letters. In order to show the user that there is "more" text already typed I would prefer an ellipsis (e.g. This is a sample inpu...) effect.
I tried to use the default TextField and BasicTextField composables but there seems to be no easy solution.
Is there a way to create this ellipsis effect in Jetpack Compose?
As you type on an EditText with autosuggestion enabled, the compose span, represented by the underlined text on the picture, is sectionized according to the stylespan I set on the toolbar. This is particularly helpful because otherwise the Google keyboard messes with the spans.
How can I do this?
I am wondering if there are any good options to implement a rich text editor in Android. Please note I am talking about a rich text editor that can be used in an Android application, not the one embedded in a web page using HTML and Javascript.
My requirements are:
Basic formatting (color, fonts, highlight, bold, italic, underline, etc.)
Hyperlinks
Inline images
Bullet lists and numbered lists
Inline table (only the contents inside a cell is editable, not the table structure)
As you can see, this is pretty much something quite similar to a typical RichEdit control on Windows.
Here are some efforts (investigation & prototyping) I have made so far:
Using WebView
I have tried using a WebView control to load an HTML fragment with one . The content becomes editable and as it is HTML, I suppose it can meet most of my requirements. But it has several issues:
(deadly) No text caret. The user will have no idea where his/her typed characters will be inserted.
The on-screen soft keyboard is not visible by default. There is a trick that the user has to long-press the Menu button to bring up the keyboard. But I think this is a very bad user experience. Besides, the screen layout is not properly rearranged and the text inserting point sometimes will be covered by the keyboard.
Using EditText
I have tried using the EditText control. It seems to support some level of rich text editing (color, fonts, bold, italic, underline, inline images, bullet lists). But I still cannot figure out how I can implement the following requirements:
Control the appereance of the bullet symbol (dot, circle, dash, arrow, star, etc.)
Numbered list (1., 2., 3., etc.)
Table
BTW, I have seen there are several *Span classes out there but I am not sure if they can be any help... And the http://developer.android.com does not provide much useful information about them.
So, how on earth can I implement a rich text editor on Android?
Can I extends the EditText and add my new functionalities? Or should I do something from scratch - extends the View and implement everything by myself? For later option (extending View), I actually even don't know how to show a text caret and blink it, not mentionging moving the caret with user typing.
I am desperate now... Any hints?
Thanks!
-Tony
(EDIT)
After some further investigation, it looks like extending EditText would be my best bet. I somehow figured out how to use those Span classes and guess I should be able to do most of the tricks by using (extending) them.
For example, extending the BulletSpan and overriding drawLeadingMargin should give me the control of the bullet appereances. Extending the LeadingMarginSpan should help me on the numbered list.
As to the table, my initial plan is to extend the LineBackgroundSpan and draw all the table borders in the drawBackground override. However, I still need to figure out how to layout all the text in the table cells and properly handle the caret movement and selection. Suggestions?
I just published my rich text editor component under the Apache 2.0 license:
https://github.com/1gravity/Android-RTEditor
You can make use of any of the following libraries:-
https://github.com/commonsguy/cwac-richedit
https://github.com/chinalwb/Android-Rich-text-Editor
https://github.com/wasabeef/richeditor-android
https://github.com/irshuLx/Android-WYSIWYG-Editor
I would probably extend both EditText and TableLayout or at least end up using most of their source if there were big enough changes I needed to make.
Can you do the following:
Manually hold the contents in the EditText as your own model (ie by seperating and maintaing the content document and the view attributes as seperate entities).
Override the render (or draw method) to do custom layout on parts of the content document (part of your model) that handle non text characters (say bullets with particular attribute).
To me seems like if you have to muck about with the layout, are you better off writing it from scratch on your own. From what I remember the Edit text (and the richt text editor) is great for anything where you the data is pure text.
There is an open source EditText rich text editor called android-richtexteditor but the code was inexplicably deleted in r5. The code is still there in r4; just use svn to check out r4 or earlier to access it. The code appears to support italics, underline, color picker, text size, and more.
Also answered in these questions: 1, 2
Extend from EditText is a best choice for you, it support CharacterSpan and
ParagraphSpan.
See my App on the Google Play:
https://play.google.com/store/apps/details?id=com.hly.notes
Check this open source Wordpress mobile application for android.It has very promising Richtexteditor based on Edittext.
You can download the source from here
Thanks
I'm looking for a way to have a grayed out text as prefix in an EditText. This text should be not selectable.
It's a bit like the To field when you're composing a message with Gmail. The only (visual) difference is that this text disappears when you start typing.
Is there any trick to achieve this in Android?
Thanks!
You can use an image of the part "EUR 2500". this you can display in your editbox without affecting the rest of the part. Follow the code:
Drawable editTextDrawable = context.getResources().getDrawable(imageId);
editTextDrawable.setBounds(0, 0, editTextDrawable.getIntrinsicWidth(),
editTextDrawable.getIntrinsicHeight());
The drawable can be used inside the edittext as follows:
editTxtItemName.setCompoundDrawables(,
ListViewConstants.editTextDrawable, null, null, null);
As an ultimate solution, you can rewrite the full EditText class by extending it and modifying it in a way that it has a custom Background set by you, and a predefined padding set by you.
Put the EUR as the background, positioning it in the left side, and then give the starting padding of the EditText in such a way that the text the user types, starts right after the EUR text.
This maybe regarded as an overkill or a poor-man's solution to this problem, but still its the ultimate option. Not the smartest one perhaps, and I also don't know if its gonna work for sure :P
All the best!