工具包无法加载OCR模块

Question

我正在开发一个涉及ML工具包的android应用程序。我研究了一下如何设置Android来使用Firebase的教程。然后我开始使用文本识别API。下面是我在某个按钮单击监听器中的代码：

        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)

我搜索了一下，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，我已经尝试过清除Google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/消除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
}

应用程序模块级配置：

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'

我决定给条形码API一个机会，并补充说

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

作为依赖。令我惊讶的是，当我对它进行API调用时，成功列表被击中，出现了以下日志：

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

而OCR仍然产生相同的错误。我认为它必须处理从库中获取的存储库。条形码API：

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

：

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，弄不清楚这一点。为什么从android.gms获取OCR，而条形码API来自firebase.ml？

Answer 1

解决方案是更新Google应用程序。一开始我并不认为这是一种选择，因为我本来希望API 29模拟器安装一个最新的Google服务。我在模拟器上登录到Google，搜索Google服务，卸载它(没有“更新”选项)，然后再次安装它。它仍然说已安装的版本是19.4.20，尽管文本识别开始像预期的那样工作。下面是一些相关的日志：

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上找到

Answer 3

这是清单上的一些代码，请检查您的清单中是否遗漏了什么。

ManifestFile installLocation

<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Internet连接
• 检查存储空间是否空闲

如果您使用仿真器

• 检查google服务是否正常工作。
• 如果需要的话更新