Android Studio ML 套件无法加载 OCR 模块

Question

我正在开发一个涉及机器学习套件的 Android 应用。我通过tutorial 了解如何设置 Android Studio 以使用 Firebase。然后我开始使用文本识别 API。这是我在某些按钮单击侦听器中的代码：

        FirebaseVisionTextRecognizer detector = FirebaseVision.getInstance()
            .getOnDeviceTextRecognizer();
        Task<FirebaseVisionText> result = detector.processImage(
            FirebaseVisionImage.fromBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.test))
        )
            .addOnSuccessListener(new OnSuccessListener<FirebaseVisionText>() {
                @Override
                public void onSuccess(FirebaseVisionText firebaseVisionText) {
                    System.out.println(firebaseVisionText);
                }
            })
            .addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                    e.printStackTrace();
                }
            });

我得到以下日志：

W/DynamiteModule: Local module descriptor class for com.google.android.gms.vision.dynamite.ocr not found.
I/DynamiteModule: Considering local module com.google.android.gms.vision.dynamite.ocr:0 and remote module com.google.android.gms.vision.dynamite.ocr:0
D/TextNativeHandle: Cannot load feature, fall back to load dynamite module.
W/DynamiteModule: Local module descriptor class for com.google.android.gms.vision.ocr not found.
I/DynamiteModule: Considering local module com.google.android.gms.vision.ocr:0 and remote module com.google.android.gms.vision.ocr:0
E/Vision: Error loading module com.google.android.gms.vision.ocr optional module true: com.google.android.gms.dynamite.DynamiteModule$LoadingException: No acceptable module found. Local version is 0 and remote version is 0.
D/TextNativeHandle: Broadcasting download intent for dependency ocr
W/TextNativeHandle: Native handle not yet available. Reverting to no-op handle.
W/DynamiteModule: Local module descriptor class for com.google.android.gms.vision.dynamite.ocr not found.
I/DynamiteModule: Considering local module com.google.android.gms.vision.dynamite.ocr:0 and remote module com.google.android.gms.vision.dynamite.ocr:0
D/TextNativeHandle: Cannot load feature, fall back to load dynamite module.
W/DynamiteModule: Local module descriptor class for com.google.android.gms.vision.ocr not found.
I/DynamiteModule: Considering local module com.google.android.gms.vision.ocr:0 and remote module com.google.android.gms.vision.ocr:0
E/Vision: Error loading module com.google.android.gms.vision.ocr optional module true: com.google.android.gms.dynamite.DynamiteModule$LoadingException: No acceptable module found. Local version is 0 and remote version is 0.
W/System.err: com.google.firebase.ml.common.FirebaseMLException: Waiting for the text recognition model to be downloaded. Please wait.
        at com.google.android.gms.internal.firebase_ml.zzrw.zzd(com.google.firebase:firebase-ml-vision@@24.0.0:21)
        at com.google.android.gms.internal.firebase_ml.zzrw.zza(com.google.firebase:firebase-ml-vision@@24.0.0:39)
        at com.google.android.gms.internal.firebase_ml.zzpd.zza(com.google.firebase:firebase-ml-common@@22.0.0:31)
        at com.google.android.gms.internal.firebase_ml.zzpf.call(Unknown Source:8)
        at com.google.android.gms.internal.firebase_ml.zzoz.zza(com.google.firebase:firebase-ml-common@@22.0.0:32)
        at com.google.android.gms.internal.firebase_ml.zzoy.run(Unknown Source:4)
        at android.os.Handler.handleCallback(Handler.java:873)
W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:99)
        at com.google.android.gms.internal.firebase_ml.zze.dispatchMessage(com.google.firebase:firebase-ml-common@@22.0.0:6)
        at android.os.Looper.loop(Looper.java:193)
        at android.os.HandlerThread.run(HandlerThread.java:65)

我四处搜索，看看如何修复这些错误：

W/DynamiteModule: Local module descriptor class for com.google.android.gms.vision.dynamite.ocr not found.
I/DynamiteModule: Considering local module com.google.android.gms.vision.dynamite.ocr:0 and remote module com.google.android.gms.vision.dynamite.ocr:0
D/TextNativeHandle: Cannot load feature, fall back to load dynamite module.
W/DynamiteModule: Local module descriptor class for com.google.android.gms.vision.ocr not found.
I/DynamiteModule: Considering local module com.google.android.gms.vision.ocr:0 and remote module com.google.android.gms.vision.ocr:0
E/Vision: Error loading module com.google.android.gms.vision.ocr optional module true: com.google.android.gms.dynamite.DynamiteModule$LoadingException: No acceptable module found. Local version is 0 and remote version is 0.

W/System.err: com.google.firebase.ml.common.FirebaseMLException: Waiting for the text recognition model to be downloaded. Please wait.

到目前为止，我已经尝试清除 Google Play 服务数据（版本 19.4.20），重新启动/重新创建模拟器，调整 Gradle 配置（例如添加/删除 firebase-core 依赖项）。 项目级配置：

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        google()
        jcenter()

    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.1'
        classpath 'com.google.gms:google-services:4.3.2'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()

    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

应用模块级配置：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.example.user.app"
        minSdkVersion 24
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'com.google.android.gms:play-services-vision:19.0.0'
    implementation 'com.google.firebase:firebase-ml-vision:24.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.2.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

}

apply plugin: 'com.google.gms.google-services'

我决定试一试 Barcode API，并添加了

implementation 'com.google.firebase:firebase-ml-vision-barcode-model:16.0.1'

作为依赖。令我惊讶的是，当我对其进行 API 调用时，成功的监听器被命中并出现以下日志：

I/DynamiteModule: Considering local module com.google.firebase.ml.vision.dynamite.barcode:10000 and remote module com.google.firebase.ml.vision.dynamite.barcode:0
    Selected local version of com.google.firebase.ml.vision.dynamite.barcode
W/is.moneytravel: Accessing hidden field Ljava/nio/Buffer;->address:J (light greylist, reflection)
I/tflite: Initialized TensorFlow Lite runtime.
I/native: barcode_detector_client.cc:222 Not using NNAPI

虽然 OCR API 仍然产生相同的错误。 我认为它必须处理从中获取库的存储库。 条码 API：

Considering local module com.google.firebase.ml.vision.dynamite.barcode:10000 and remote module com.google.firebase.ml.vision.dynamite.barcode:0

OCR API：

Considering local module com.google.android.gms.vision.dynamite.ocr:0 and remote module com.google.android.gms.vision.dynamite.ocr:0

我对 Gradle 和 Firebase 的经验太少，无法弄清楚这一点。 为什么OCR API取自android.gms，而Barcode API取自firebase.ml？

Answer 1

解决方案是更新 Google Play 服务应用。起初我不认为这是一个选项，因为我希望 API 29 模拟器安装最新的 Google Play 服务。我在模拟器上登录 Google Play，搜索 Google Play 服务，将其卸载（没有“更新”选项），然后再次安装。它仍然说安装的版本是19.4.20，尽管文本识别开始按预期工作。以下是一些相关日志：

W/DynamiteModule: Local module descriptor class for com.google.android.gms.vision.dynamite.ocr not found.
I/DynamiteModule: Considering local module com.google.android.gms.vision.dynamite.ocr:0 and remote module com.google.android.gms.vision.dynamite.ocr:0
D/TextNativeHandle: Cannot load feature, fall back to load dynamite module.
I/DynamiteModule: Considering local module com.google.android.gms.vision.ocr:0 and remote module com.google.android.gms.vision.ocr:1
I/DynamiteModule: Selected remote version of com.google.android.gms.vision.ocr, version >= 1
V/DynamiteModule: Dynamite loader version >= 2, using loadModule2NoCrashUtils

Answer 2

尝试在您的 AndroidManifest.xml 中添加以下内容

<application>
    ...

    <meta-data android:name="com.google.android.gms.vision.DEPENDENCIES" android:value="ocr"/>

</application>

文档可以在https://developers.google.com/ml-kit/vision/text-recognition/android找到

Answer 3

这是清单中的一些代码，请检查您是否遗漏了一些代码。

ManifestFile 安装位置

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.******.***"
    android:installLocation="auto"
/>
<!-- make sure to add 'android:installLocation="auto"', it was missing for me -->

ManifestFile 元数据

<application
    <!-- ..... -->
    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" /> <!--version--><!-- make sure added-->
    <meta-data
        android:name="com.google.android.gms.vision.DEPENDENCIES"
        android:value="barcode" /><!-- barcode,face,ocr make sure added-->
    <!-- ..... -->
</application>

• 检查互联网连接
• 检查存储是否有可用空间

如果你使用模拟器

• 检查 google 服务是否正常工作
• 如果需要更新它

Answer 4

对我来说，使用其他 AVD 解决了这个问题。 Google Play 商店应该是最新的。 尝试使用模拟器 AVD - Android Nexus 5X。