Android Get Country Emoji Flag Using Locale

问题

I have seen that since Lollipop, Android has built in Emoji flags for different countries. Is it possible to use the devices locale to retrieve the Emoji flag for that country?

I wanted to insert the Emoji flag into a TextView which contains the user's location.

回答1:

I was looking for that too but I don't think it's possible yet.

Have a look here: http://developer.android.com/reference/java/util/Locale.html

No mentioning about flags.

Alternately you can check the answer here:

Android Countries list with flags and availability of getting iso mobile codes

that might help you.

回答2:

Emoji is a Unicode symbols. Based on the Unicode character table Emoji flags consist of 26 alphabetic Unicode characters (A-Z) intended to be used to encode ISO 3166-1 alpha-2 two-letter country codes (wiki).

That means it is possible to split two-letter country code and convert each A-Z letter to regional indicator symbol letter:

private String localeToEmoji(Locale locale) {
    String countryCode = locale.getCountry();
    int firstLetter = Character.codePointAt(countryCode, 0) - 0x41 + 0x1F1E6;
    int secondLetter = Character.codePointAt(countryCode, 1) - 0x41 + 0x1F1E6;
    return new String(Character.toChars(firstLetter)) + new String(Character.toChars(secondLetter));
}

Where 0x41 represents uppercase A letter and 0x1F1E6 is REGIONAL INDICATOR SYMBOL LETTER A in the Unicode table.

Note: This code example is simplified and doesn't have required checks related to country code, that could be not available inside the locale.

回答3:

Based on this answer, I wrote a Kotlin version below using extension function.

I also added some checks to handle unknown country code.

/**
 * This method is to change the country code like "us" into 🇺🇸
 * Stolen from https://stackoverflow.com/a/35849652/75579
 * 1. It first checks if the string consists of only 2 characters: ISO 3166-1 alpha-2 two-letter country codes (https://en.wikipedia.org/wiki/Regional_Indicator_Symbol).
 * 2. It then checks if both characters are alphabet
 * do nothing if it doesn't fulfil the 2 checks
 * caveat: if you enter an invalid 2 letter country code, say "XX", it will pass the 2 checks, and it will return unknown result
 */
fun String.toFlagEmoji(): String {
    // 1. It first checks if the string consists of only 2 characters: ISO 3166-1 alpha-2 two-letter country codes (https://en.wikipedia.org/wiki/Regional_Indicator_Symbol).
    if (this.length != 2) {
        return this
    }

    val countryCodeCaps = this.toUpperCase() // upper case is important because we are calculating offset
    val firstLetter = Character.codePointAt(countryCodeCaps, 0) - 0x41 + 0x1F1E6
    val secondLetter = Character.codePointAt(countryCodeCaps, 1) - 0x41 + 0x1F1E6

    // 2. It then checks if both characters are alphabet
    if (!countryCodeCaps[0].isLetter() || !countryCodeCaps[1].isLetter()) {
        return this
    }

    return String(Character.toChars(firstLetter)) + String(Character.toChars(secondLetter))
}

Runnable Code Snippet

I also included a runnable Kotlin snippet using Kotlin Playground. In order to run the snippet you need to:

click "Show code snippet"
click "Run Code Snippet"
click the play button at the right top of the generated console

scroll to the bottom to see the result (it's hidden..)

<script src="https://unpkg.com/kotlin-playground@1.6.0/dist/playground.min.js" data-selector=".code"></script>


<div class="code" style="display:none;">

/**
 * This method is to change the country code like "us" into 🇺🇸
 * Stolen from https://stackoverflow.com/a/35849652/75579
 * 1. It first checks if the string consists of only 2 characters: ISO 3166-1 alpha-2 two-letter country codes (https://en.wikipedia.org/wiki/Regional_Indicator_Symbol).
 * 2. It then checks if both characters are alphabet
 * do nothing if it doesn't fulfil the 2 checks
 * caveat: if you enter an invalid 2 letter country code, say "XX", it will pass the 2 checks, and it will return unknown result
 */
fun String.toFlagEmoji(): String {
    // 1. It first checks if the string consists of only 2 characters: ISO 3166-1 alpha-2 two-letter country codes (https://en.wikipedia.org/wiki/Regional_Indicator_Symbol).
    if (this.length != 2) {
        return this
    }

    val countryCodeCaps = this.toUpperCase() // upper case is important because we are calculating offset
    val firstLetter = Character.codePointAt(countryCodeCaps, 0) - 0x41 + 0x1F1E6
    val secondLetter = Character.codePointAt(countryCodeCaps, 1) - 0x41 + 0x1F1E6

    // 2. It then checks if both characters are alphabet
    if (!countryCodeCaps[0].isLetter() || !countryCodeCaps[1].isLetter()) {
        return this
    }

    return String(Character.toChars(firstLetter)) + String(Character.toChars(secondLetter))
}

fun main(args: Array&lt;String&gt;){
  println("us".toFlagEmoji())
  println("AF".toFlagEmoji())
  println("BR".toFlagEmoji())
  println("MY".toFlagEmoji())
  println("JP".toFlagEmoji())
}

</div>

回答4:

When I first wrote this answer I somehow overlooked that I've only worked on Android via React Native!

Anyway, here's my JavaScript solution that works with or without ES6 support.

    function countryCodeToFlagEmoji(country) {
      return typeof String.fromCodePoint === "function"
        ? String.fromCodePoint(...[...country].map(c => c.charCodeAt() + 0x1f185))
        : [...country]
            .map(c => "\ud83c" + String.fromCharCode(0xdd85 + c.charCodeAt()))
            .join("");
    }

console.log(countryCodeToFlagEmoji("au"));
console.log(countryCodeToFlagEmoji("aubdusca"));

If you want to pass in the country codes as capital letters instead, just change the two offsets to 0x1f1a5 and 0xdda5.

回答5:

I am using this so easily. Get the Unicode from here.

For Bangladesh flag it is U+1F1E7 U+1F1E9 Now,

{...

 String flag = getEmojiByUnicode(0x1F1E7)+getEmojiByUnicode(0x1F1E9)+ " Bangladesh";
    }
    public String getEmojiByUnicode(int unicode){
        return new String(Character.toChars(unicode));
    }

It will show > (Bangladeshi flag) Bangladesh

来源：https://stackoverflow.com/questions/30494284/android-get-country-emoji-flag-using-locale

标签

android

unicode

textview

emoji

country