I would like to draw vertical lines between Numbers/Letters in my TextView. So it should look similar to
A|B|C|D
without the use of the | character and use drawLine() instead.
I am trying to do it using the width of the TextView and assuming the centre of each character will find itself at , 1/8, 3/8, 5/8, 7/8 of the TextView width for this example. However the lines dont line up as they should.
Not sure whats not working, help appreciated.
I am trying to do it using the width of the TextView and assuming the centre of each character will find itself at , 1/8, 3/8, 5/8, 7/8 of the TextView width for this example.
That's your problem. For starters, you haven't specified that you're using a mono-spaced font. If you're not, then the letters won't be evenly distributed. Even if you are using a mono-spaced font, likely the padding at the beginning (and possibly end) of the TextView are going to offset things. I can't remember exactly how TextView measures things, but I suspect looking at actual left padding value would be a good start to find the left padding. If you want to use this with a variable width font, you'll want to use something like Paint.measureText to measure the width of the characters.
Once you have all that, you can add the width of the character(s) to the left padding to find the position to place each line.
Related
I have a textview where I want to show text in vertical (just like rotated 90º). With android:rotation="-90" you can get this.
If the text would have no rotation, and you would like to fit a sentence, you would first look at the width of the textview, since text will try to be in 1 line. Since I rotate the text, here I expect to see the height of the object. However, Android is still considering the width. I need to fix the size of the width, but this causes me a problem for the text: Although the textview has a big vertical dimension and text would fit, Android thinks it needs to use the width to calculate the available space. At the end this causes me overflow of the text, appearing for example, just one word as multiple lines of 1 char.
How can I make android to understand that the space for the lenght to fit the text is now the vertical, instead of the horizontal?
I would like to have my 2-line text view in android-xml centered horizontally with the smallest width necessary. At the moment it's like the first line is completely filled and the second with the rest of the words.
Does anyone know how to achieve that both lines are filled kind of equally? Below are 2 images, the first showing the default multi-line text view, the second what I would like to achieve. As you can see, the second image requires much less width than the first and is more in the center of the view.
Thanks in advance!
Try setting android:breakStrategy attribute of textView to balanced
android:breakStrategy="balanced"
Add this line to your textView's xml code, this will balance the lines.
Consider this layout:
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="160dp"
android:textSize="20sp"
android:text="Apple Inc. is an American multinational technology company headquartered in Cupertino, California, that designs, develops, and sells consumer electronics, computer software, and online services."
android:ellipsize="end"
android:gravity="top"/>
What I want the TextView to do is to figure out how many lines it can fit in 160dp and places three dots if room is not enough. However the text is cut off instead:
How can I achieve the above behavior? I assume I can do it by just specifying some attribute on the layout resource file. Thanks.
There's no way to achieve this by simply specifying attributes on the layout resource file.
If you look at the setEllipsize() method in TextView, you'll see that it says:
Causes words in the text that are longer than the view's width to be ellipsized instead of broken in the middle. You may also want to setSingleLine() or setHorizontallyScrolling(boolean) to constrain the text to a single line. Use null to turn off ellipsizing. If setMaxLines(int) has been used to set two or more lines, only TextUtils.TruncateAt.END and TextUtils.TruncateAt.MARQUEE are supported (other ellipsizing types will not do anything).
From that documentation, you can see that ellipsis in TextView is actually highly dependent on two factors: view width and number of lines.
As such, I recall that an ellipsis might not show up for a TextView if it doesn't know the maximum number of lines that your TextView can have.
So for your intended behavior, this isn't possible because you're depending on the View's height instead. You want to use a specific height then have a TextView calculate the amount of lines that can be shown within that height. Finally, if the amount of lines needed is greater than the amount shown, you want to show ellipses.
That's... not possible with how the ellipses in TextView is coded. It simply wasn't meant for that.
Therefore, if you want this behavior, you need to either:
Create a custom TextView for your specific ellipses implementation
Manually calculate the amount of lines visible, then use setMaxLines() on that TextView
For the second option, you can calculate this by using the TextView methods getHeight() and getLineHeight().
For example:
textview = (TextView) findViewById(R.id.exampleTextView);
textview.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
final int maxLines = textview.getHeight() / textview.getLineHeight();
textview.setMaxLines(maxLines);
}
});
In my example, I'm doing this inside a ViewTreeObserver to avoid getHeight() calling a size of 0.
The second option should be able to get the behavior you want, but if you want this for every TextView, you should consider creating a custom TextView instead.
Set the layout_gravity on the TextView to fill
bottomPadding returns 0 and is set to 0, but my textview still has padding below it's text.
I am trying to draw text on a canvas at the same height as the textview is from its parent but for some reason Paint.drawText() ignores the extra padding at the bottom.
Since the canvas object has its origin a the bottom-left corner, I have to provide the the y position of the text from below.
I can't do the following:
yPosition = textview.bottom + ((rectbounds.getHeight() - textViewHeigth)/2)
This is because the size of the space on top of the text is bigger than the bottom space.
Removing the extra space from the textview would also solve my problem. However, I already tried setting includeFontPadding to false, and setting padding to 0, but neither work.
What happens if you put a 'g', 'p', 'y', or 'j' in your TextView? Each of these characters has a descender, and the metrics for the font will always allocate space for this feature of many scripts. This is to allow for the fact that multiple lines of flowing text ought not be crammed into each other.
If you really need to get the size of a font's descender, you can use a Paint object, load it with a Typeface and ask for its descent(). But a TextView I don't think is going to change the way it renders its lines for you. If you must ignore the descent, draw your own text in a custom view.
I have a TextView that can have a few different values, and is updated runtime (in Java code).
However, I need this TextView to retain its center point, so that when the text in that TextView is updated, it is always center justified. It should be centered around a point which is not the center of the screen or anything else, so setting gravity only will not help.
As the values that it may contain are already defined, I could try with the longest one first, position it to the correct top left position and set its gravity to center. In this case every shorter in length text should fit correctly.
However, I would like to know if there is better approach, for cases when the values are not known beforehand.
This TextView is placed below an ImageView and it could take the whole screen width (nothing else is placed left or right to it).
Note: I guess it could be also possible to position it every time to a new X axis position, whenever the text is changed, but I don't think it is a nice solution at all.
Set the android:layout_width to match_parent and set android:gravity to center_horizontal.
This way the View is stretched all the way horizontally, and the content (the text) will be centered. If the content changes, it will still be centered.
One thing that many people don't realize is the difference between android:gravity and android:layout_gravity. The first one defines the alignment of the content inside itself, the other one defines alignment of itself relative to its parent.