Android Emoji App Compat Text View 不渲染一些表情符号，例如👁

Question

I'm trying to use the Emoji App Compat Text View but I don't understand what I'm doing wrong on my implementation.

I'm trying to render these three emojis 👣👁👀 , it works fine on Android Q, but it is not working on Android Lollipop, take a look at the screenshots:

Screenshot on Android Q	Screenshot on Android Lollipop

As far as I understood the idea of using the Emoji App Compat Text View is to get the emoji set working fine from android API 21 and later, so please take a look at my implementation, is there anything missing, wrong or maybe Emoji App Compat Text View does not work as I thought?

You can get the complete code here at github or read the main parts below:

Application's onCreate, set up the EmojiCompat, I'm not using the bundled version:

EmojiCompat.init(
    FontRequestEmojiCompatConfig(
        this,
        FontRequest(
            "com.google.android.gms.fonts",
            "com.google.android.gms",
            "Noto Color Emoji Compat",
            R.array.com_google_android_gms_fonts_certs
        )
    ).setReplaceAll(true)
    // I did remove the callback for brevity, but I got the `onInitialized` called.
)

Activity, just set the layout, get the View and set the text:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
…
    <androidx.emoji.widget.EmojiAppCompatTextView
        android:id="@+id/text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="60sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
…
</androidx.constraintlayout.widget.ConstraintLayout>

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        findViewById<EmojiAppCompatTextView>(R.id.text_view).text = getString(R.string.three_emojis)
    }
}

Strings

<string name="three_emojis">👣👁👀</string>

gradle

plugins {
    id "com.android.application"
    id "kotlin-android"
}

android {
    compileSdkVersion 29
    buildToolsVersion "30.0.2"
…
    defaultConfig {
        minSdkVersion 21
        targetSdkVersion 29
…
    }
…
}

dependencies {
    implementation "androidx.emoji:emoji-appcompat:1.1.0"
    implementation "androidx.emoji:emoji:1.1.0"
    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
    implementation "androidx.appcompat:appcompat:1.2.0"
    implementation "androidx.constraintlayout:constraintlayout:2.0.4"
    implementation "androidx.core:core-ktx:1.3.2"
    implementation "com.google.android.material:material:1.2.1"
}

Answer 1

Conclusion : By default, the text style will be used, unless these are followed by the U+FE0F variation selector.

This can be validated using the following method:

Case 1 : Return false on all Android versions.

EmojiCompat.get().hasEmojiGlyph(String(charArrayOf('\uD83D', '\uDC41')))

Case 2 : Return true on Android API versions >=18

EmojiCompat.get().hasEmojiGlyph(String(charArrayOf('\uD83D', '\uDC41', 65039.toChar())))

Solution : .setUseEmojiAsDefaultStyle(true)

class App : Application() {
    override fun onCreate() {
        super.onCreate()
        AppCompatDelegate.setCompatVectorFromResourcesEnabled(true)
        EmojiCompat.init(
            FontRequestEmojiCompatConfig(
                this,
                FontRequest(
                    "com.google.android.gms.fonts",
                    "com.google.android.gms",
                    "Noto Color Emoji Compat",
                    R.array.com_google_android_gms_fonts_certs
                )
            ).setReplaceAll(true)
                .setUseEmojiAsDefaultStyle(true)
                .registerInitCallback(object : EmojiCompat.InitCallback() {
                    override fun onInitialized() {
                        super.onInitialized()
                        Toast.makeText(this@App, "EmojiCompat was initialized", LENGTH_SHORT).show()
                    }

                    override fun onFailed(throwable: Throwable?) {
                        super.onFailed(throwable)
                        throw RuntimeException(throwable)
                    }
                })
        )
    }
}

Tested on Android API 19: