Develop Reference

Changing a TextView's style and text dynamically

I'm trying to make an app like the one in this mockup:
Supermarket
It's a very simple supermarket app. As you can see, there's a TextView at the bottom of the screen that tells me whether my Cart is empty, or has items in it. If the cart is not empty, the user is shown the total price he/she must pay. You can also notice that said TextView's style and text change according to a variable (in this case, "totalPrice").
How can I do this in Android? I know I can use simple if statements (if totalPrice == 0, then backgroundColor = grey and text = "EmptyCart", for example), but this seems somewhat... hardcoded. Is there a better way to do it? As you can see, the TextView's style and values also change when on the "Subproducts" activity (some Products have Subproducts, which you can see after clicking on them).
Thanks in advance!

I think Databinding is the best way rather than boilerplate code.
create a model class and change background of the view using ternary operation in databinding also manage visibility of price text using this.

To set a textview's text, you use textView.setText("new text"); To set its background, its textView.setBackgroundColor(color) where the color is the hexcode you want as an integer- for example 0xFFFF0000 for reg. Obviously these can be variables as well as hard coded.

It can simply be achieved with two TextViews in a RelativeLayout, and of course, by using basic TextView's methods. As an example layout:
<RelativeLayout
android:layout_height="75dp"
android:layout_width="match_parent"
android:background="#1EC4F3">
<TextView
android:text="PAY"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:typeface="sans"
android:textColor="#FFFFFF"
android:textSize="18sp"/>
<TextView
android:layout_height="wrap_content"
android:text="$25.79"
android:layout_width="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="8dp"
android:typeface="monospace"
android:textSize="14sp"
android:textColor="#FFFFFF"/>
</RelativeLayout>

Ho to Create text View with skew pattern with out adding \t of \n?

I want to create text view different margin starts for different lines(Line skew pattern) with out\t of \n. for example:

Your best bet would be to use either padding or margin and maybe look at separating the texts into separate Textviews to achieve this...
Example:
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:paddingLeft="10dp" <!--either margin or padding -->
android:text="Stackoverflow..." />
I've seen other answers regarding the use of Webviewsand using text set to HTML to display in the Webview.
Could work potentially.

Text View Text analysis in Android

I have a textview and the text is loaded dynamically.
<TextView
android:id="#+id/txt_song_title"
style="?attr/txtcolorHightlight"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_alignTop="#id/frlyt_img_cover"
android:layout_marginLeft="#dimen/activity_horizontal_margin"
android:layout_marginTop="#dimen/activity_vertical_margin"
android:layout_toLeftOf="#id/img_audio_source_icon"
android:ellipsize="end"
android:fontFamily="#string/roboto_light"
android:maxLines="3"
android:text=""
android:textSize="#dimen/font_36" />
The textview has to show the entire text which is set (10 to 100+)characters. Based on text length, the font size should be changed inorder to fit the entire text. How to calculate num of words in the textview to change font size and display entire text without clipping dynamically?

I think you can do it from java code level. TextView class provides methods to implement this.
Following link may be useful.
Auto Scale TextView Text to Fit within Bounds

Try using a library, for example a simple google search gave me this:
https://github.com/grantland/android-autofittextview
I have not tried it but it seems ok :)

Limiting a String to 2 lines in android, then cut it and concatenate a String

My question may sound a bit weird but I'll try to explain it better here.
I ahve a TextView in android, at the inferior part of my activity. I want to have it limited to 2 lines, which is easily reachable by adding the following line in the TextView xml element:
android:maxLines="2"
Okay, now we've got it limited to 2 lines.
Then, in my Activity, I make:
termsandconditions = (TextView) findViewById(R.id.textView1);
termsandconditions.setText(terms);
Okay, now I've got a big string with the terms and conditions, but limited to 2 lines due to the xml attribute.
Now my question is, how can I cut it after having it limited to 2 lines, and concatenate a string with "Read more"? I don't need it to be in the same textView or whatever, I only want that it looks like:
Terms: blablablalblalbla blal blablalblalblalblalbla lalblalblalblalblalblalb lalblalblalb lalblalblalblalblalb lalblalblalb lalblalblalblalb lalb bla View More.
Thanks and I hope you can understand my problem.

You can use setEllipsize (TextUtils.TruncateAt where) method of TextView or the android:ellipsize XML attribute.
public void setEllipsize (TextUtils.TruncateAt where) Added in API
level 1
Causes words in the text that are longer than the view is wide 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, END and
MARQUEE* are only supported (other ellipsizing types will not do
anything).
Related XML Attributes
android:ellipsize

Might be a bit hacky, but here's my suggestion:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<TextView
android:id="your_text_view"
android:text="long long long text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="link"
android:text="View More"
android:onClick="addMoreLinesAndHideThisTextView"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</RelativeLayout>
Some additional tweaking may be needed, but I think you got the idea.

android append '…' at the end textview _EDIT

I have a lsit view and i that i need to add some text.
in the adapter, I need to append ... at the end and i used the following
when i give
android:ellipsize="end"
in the only shows 2 line
eg:
asdnfsdfdsf asdfsdfasdf
sdfsd sdfsdf sdfsd ad...
And when i give
android:ellipsize="start"
it is as :
asdnfsdfdsf asdfsdfasdfd
...sdfsd sdfsdf sdfsd ad
The complete code i used:
<TextView android:layout_width="wrap_content" android:background="#016A7D"
android:layout_height="80dp" android:textColor="#000000"
android:maxLines="4"
android:id="#+id/list_report_desciption"
android:ellipsize="end"
/>
And the output i got is:
What exactly will a smarter planet
look like? How's IT changing? A...
actually it contains more than 6 lines
Is there any thing i need to set so that i need to get 3 lines
Thanks

Text ellipsization seems buggy, accroding to this report:
http://code.google.com/p/android/issues/detail?id=10554
A workaround allows ellipsizing one line of text, by setting the android:singleLine attribute to true. But this attribute is deprecated.

Nothing worked for me:-(
I just fixed the length. Cut the string in that length and append '...' after that.
Now its working for me.

I was looking for a simple solution for this myself, I ended up with something like:
private String getTextWithMoreIndicator(TextView textView, String text) {
long maxVisibleChars = textView.getPaint().breakText(text, true, textView.getMeasuredWidth(), null);
if(maxVisibleChars < text.length()) {
text = text.substring(0, (int)maxVisibleChars -3) + "...";
}
return text;
}

The solution you accepted will not scale correctly on all devices.
Reason : the width of "a" is lesser than "A", so, if you are truncating string based on some size (say 15 letters) and adding "..." through code. You might see results not expected.
Now coming to the solution:-
Solutions:
Solution # 1 :
Add the following 3 attributes to your TextView and you'll get the result you want :)
<TextView
android:ellipsize="end"
android:lines="1"
android:scrollHorizontally="true" />
Solution # 2 :
Another workaround might be, you could decide to marquee text (the fancy animation moving your text from right to left). For that you need following attributes in your TextView xml:-
<TextView
android:id="#+id/my_text_view"
android:ellipsize="marquee"
android:lines="1"
android:scrollHorizontally="true"
android:marqueeRepeatLimit="marquee_forever" />
And then in you code you need to get the TextView by its id and put-in the following line:-
TextView myTextView = (TextView) findViewById(R.id.my_text_view);
myTextView.setSelected(true);
#### Edit:- ####
I just figured out that for my solution to work in android versions greater than 2.3.x we need to add the following line in our TextView xml :-
android:singleLine="true"
Although its a deprecated attribute, but you have to add this, otherwise marquee or "..." wont work.
Hope this answers the question :)