问题
This question has been asked severally and only suggestions are made. Ill comprehend every suggestion hopefully.
the dependency is defined in the manifest
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version"/>
<meta-data
android:name="com.google.android.gms.vision.DEPENDENCIES"
android:value="ocr" />
and added on the app level
compile 'com.google.android.gms:play-services-vision:9.8.0'
The test device has sufficient storage which is greater than 10% of the internal and also has a very good internet connection. Permissions are also clearly defined
We start the TextRecognizer to detect text and we get our null response:
TextRecognizer textRecognizer = new TextRecognizer.Builder(getContext()).build();
if (!textRecognizer.isOperational()) {
Log.w("Main Activity", "Dependencies are not yet available");
Toast.makeText(getContext(), "Cannot Detect", Toast.LENGTH_LONG).show();
if(((MainActivity) getActivity()).hasLowStorage()) {
Toast.makeText(getContext(), "Low Storage", Toast.LENGTH_LONG).show();
Log.w("Custom_Storage", "Low Storage");
}
}
Most suggestions are to use a lower dependency compile 'com.google.android.gms:play-services:7.8+' but it doesn't work for everyone. After publishing the app, some users cant use the app.
The suggestions are not solving the problem.
Similar questions: TextRecognizer isOperational API always returns false and detector.isOperational() always false on android
回答1:
TextRecognizer API is required to download few dependency files. Usually it is done at the time of installation but sometimes it take longer time. App will automatically download those files. Wait some time to download those files. Until download is complete TextRecognizer.isOperational will return false. After the doanlowd is completed TextRecognizer.isOperational will return true.
回答2:
Even I had the same problem. I just created a new project and copied and installed dll again. Now it is working.
来源：https://stackoverflow.com/questions/46410777/textrecognizer-isoperational-api-always-returns-false