is it possible to add   in Text开发者_运维百科View? Has anyone achieved similar functionality?

I want to have non-breakable space in TextView.

TextView respects the Unicode no-break space character (\u00A0), which would be a simpler/lighter solution than HTML.

It is possible to use   to have a readable solution. Including \u00A0 or   or  /  in the text doesn't really convey much information to the reader of the source code (or translator for that matter), unless you remember the hex codes. Here's a way to use the named entity in strings.xml:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE resources [
    <!ENTITY nbsp "&#160;"><!-- non-breaking space, U+00A0 -->
]>
<resources>
    ...
</resources>

This will create the missing declaration. The original HTML declaration can be found in https://www.w3.org/TR/xhtml1/DTD/xhtml-lat1.ent referenced from the usual XHTML DTDs. All this works, because the XML parser reads these and substitutes while loading the file, so the entity won't be present in the resulting compiled resources.

  in Android Text (CharSequence) Resources

<!-- Defined in <resources> -->
<string name="html_text">Don\'t break <b>this&nbsp;name</b></string>

<!-- Used in a layout -->
<TextView
    android:layout_width="130dp"
    android:layout_height="wrap_content"
    android:background="#10000000"
    android:text="@string/html_text"
    />

Device and preview (preview doesn't recognize HTML)

  in Android String (formatted) Resources

<!-- Defined in <resources> -->
<string name="formatted_text">%1$s is&nbsp;nice</string>

<!-- Used in a layout -->
<TextView
    android:layout_width="130dp"
    android:layout_height="wrap_content"
    android:background="#10000000"
    tools:text="@string/formatted_text"
    />

Then in code:

String contents = getString(R.string.formatted_text, "Using an  ");
((TextView)view.findViewById(android.R.id.text1)).setText(contents);

Device and preview (preview doesn't recognize entities and Java strings are literal text!)

Further tricks

These are just example uses of DTD entities, use it base on your own preference.

<!ENTITY con "\&apos;"><!-- contraction, otherwise error: "Apostrophe not preceded by \"
                            Sadly &apos; cannot be overridden due to XML spec:
                            https://www.w3.org/TR/xml/#sec-predefined-ent -->
<!ENTITY param1 "&#37;1$s"><!-- format string argument #1 -->

<string name="original">Don\'t wrap %1$s</string>
<string name="with_entities">Don&con;t wrap &param1;</string>

Both of them help highlighting:

\u00A0 is a non-breaking space, \u0020 is not a non-breaking space

The TextView should respect the non breaking space

<string name="test">Hello&#160;world</string>

or

new TextView("Hello\u00A0world");

One unique situation I ran into was adding a non-breaking space to a string resource that took String.format parameters.

<resources>
    <string name="answer_progress" formatted="false">Answered %d of %d</string>
</resources>

I tried to simply copy and past the non-breaking space character into the string and it was replaced with a regular old space after compiling.

Removing the formatted="false", numbering the format args and using the backslash notation worked for me:

<resources>
    <string name="answer_progress">Answered %1$d\u00A0of\u00A0%2$d</string>
</resources>

This worked for me:

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
    textview.setText(Html.fromHtml(your string, Html.FROM_HTML_MODE_LEGACY));
} else {
    textview.setText(Html.fromHtml(your string);
}

This is an example that using nbsp in a TextView

<string name="text">Example:\u00A0</string>

Strange, but in my case non of these two worked:

•  
• \u00A0 The TextView was showing them as text.

So I just inserted non-breaking space as it is: " "

I needed narrow no-break space (nnbs) in my app (its smaller then regular space) but nothing worked for me.

So i made this extension to simulate nnbs

For spannable

fun SpannableString.transparent(symbol: String): SpannableString {
    val startIndex = indexOf(symbol)
    val endIndex = startIndex + symbol.length

    setSpan(ForegroundColorSpan(android.R.color.transparent), startIndex, endIndex, 0)
    return this
}

fun SpannableString.fontSize(symbol: String, fontSize: Int): SpannableString {
    val startIndex = indexOf(symbol)
    val endIndex = startIndex + symbol.length

    setSpan(AbsoluteSizeSpan(fontSize), startIndex, endIndex, SPAN_INCLUSIVE_INCLUSIVE)
    return this
}

For TextView:

/**
 * Font size divider for narrow no-break space
 */
const val NNBS_FONT_SIZE_DIVIDER = 3f

/**
 * Unique symbol for simulating narrow no-break space
 */
const val NNBS_SYMBOL = "$"

/**
 * For some reasons, Android not supporting narrow no-break space.
 * This extension make @param symbol transparent and decrease font size to
 * simulate narrow no-break space
 */
fun TextView.narrowNoBreakSpace(symbol: String, originalText: String) {
    val nnbsFontSize = (textSize / NNBS_FONT_SIZE_DIVIDER).roundToInt()

    text = SpannableString(originalText)
        .transparent(symbol)
        .fontSize(symbol, nnbsFontSize)
}

Usage:

val text = "Here is >$NNBS_SYMBOL< narrow no-break space."
textView.narrowNoBreakSpace(NNBS_SYMBOL, text)