Firebase ML 套件为 FirebaseMLException:等待文本识别模型下载.请稍候

Question

我使用Firebase ml套件进行文本识别，但在模拟器和真实设备上给出了这个例外。

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.zzjz.zzc(Unknown Source)
at com.google.android.gms.internal.firebase_ml.zzjz.zza(Unknown Source)
at com.google.android.gms.internal.firebase_ml.zzic.call(Unknown Source)
at com.google.android.gms.internal.firebase_ml.zzhx.zza(Unknown Source)
at com.google.android.gms.internal.firebase_ml.zzhy.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at com.google.android.gms.internal.firebase_ml.zze.dispatchMessage(Unknown Source)
at android.os.Looper.loop(Looper.java:136)
at android.os.HandlerThread.run(HandlerThread.java:61)

这是我的代码

private fun MlProcessText(imageUri:Uri) {
val bitmap = MediaStore.Images.Media.getBitmap(contentResolver, imageUri)
val textVision = FirebaseVisionImage.fromBitmap(bitmap)
val detector = FirebaseVision.getInstance().onDeviceTextRecognizer
detector.processImage(textVision).addOnSuccessListener { it ->
val blocks = it.textBlocks
if (blocks.size == 0 ){
tvVision.text = "NO TEXT"
}else{
blocks.forEach {
tvVision.append(" ${it.text}")
}
}
}.addOnFailureListener {
it.printStackTrace() // this is the exception log
tvVision.text = it.message
}
}

我也试过：

1-设置->应用->谷歌播放服务->存储->管理空间->清除所有数据

2-低存储检查(至少1G免费(

并添加元数据

<meta-data
android:name="com.google.firebase.ml.vision.DEPENDENCIES"
android:value="ocr,text" />

但仍然是同样的错误！

更新

卡了几天后，我尝试使用谷歌移动视觉

所以我把它添加到我的依赖项中

implementation 'com.google.android.gms:play-services-vision:17.0.2'

并将本文用于OCR和此代码

//Create the TextRecognizer
final TextRecognizer textRecognizer = new TextRecognizer.Builder(getApplicationContext()).build();
if (!textRecognizer.isOperational()) {
Log.w(TAG, "Detector dependencies not loaded yet");
} else {
//Initialize camerasource to use high resolution and set Autofocus on.
mCameraSource = new CameraSource.Builder(getApplicationContext(), textRecognizer)
.setFacing(CameraSource.CAMERA_FACING_BACK)
.setRequestedPreviewSize(1280, 1024)
.setAutoFocusEnabled(true)
.setRequestedFps(2.0f)
.build();
}

textRecognizer.isOperational()返回总是false. 这意味着它也不起作用.我认为这两个问题有一些共同点。

所以我被困在安卓文本识别器上！

测试：Nox模拟器，谷歌Nexus 5X API 26模拟器以及华为p10和三星Galaxy S7真实设备。

有什么想法可以解决这个问题吗？

Answer 1

TextRecognizer textRecognizer = new TextRecognizer.Builder(this).build();
if(!textRecognizer.isOperational()) {
// Note: The first time that an app using a Vision API is installed on a
// device, GMS will download a native libraries to the device in order to do detection.
// Usually this completes before the app is run for the first time.  But if that
// download has not yet completed, then the above call will not detect any text,
// barcodes, or faces.
// isOperational() can be used to check if the required native libraries are currently
// available.  The detectors will automatically become operational once the library
// downloads complete on device.
Log.w(LOG_TAG, "Detector dependencies are not yet available.");
// Check for low storage.  If there is low storage, the native library will not be
// downloaded, so detection will not become operational.
IntentFilter lowstorageFilter = new IntentFilter(Intent.ACTION_DEVICE_STORAGE_LOW);
boolean hasLowStorage = registerReceiver(null, lowstorageFilter) != null;
if (hasLowStorage) {
Toast.makeText(this,"Low Storage", Toast.LENGTH_LONG).show();
Log.w(LOG_TAG, "Low Storage");
}

Answer 2

我注意到有时问题是互联网连接速度慢，只需要更多时间下载模型。 为了尽量减少糟糕的用户体验，我添加了这个预热方法，并在应用程序启动后立即调用它，因此当实际识别发生时，模型已经下载。

/**
* We call that on startup with hope the needed model will be downloaded as soon as possible;
* It is used to prevent: "Waiting for the text recognition model to be downloaded. Please wait."
* exception when recognizing.
*/
public static void warmUp() {
Bitmap image = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888);
image.eraseColor(android.graphics.Color.GREEN);
FirebaseVisionImage firebaseVisionImage = FirebaseVisionImage.fromBitmap(image);
FirebaseVision.getInstance().getOnDeviceTextRecognizer()
.processImage(firebaseVisionImage)
.addOnSuccessListener(null)
.addOnFailureListener(null);
}

Answer 3

尝试从 Google Play 服务卸载更新。