[null,null,["最終更新日 2025-09-03 UTC。"],[[["\u003cp\u003eEasily add a document scanning feature to your Android app using the ML Kit document scanner API.\u003c/p\u003e\n"],["\u003cp\u003eThe API provides a customizable UI flow for document scanning, including options for importing from the photo gallery, setting page limits, and adjusting scanner modes.\u003c/p\u003e\n"],["\u003cp\u003eRetrieve scanned documents as JPEG and/or PDF files using the \u003ccode\u003eGmsDocumentScanningResult\u003c/code\u003e object.\u003c/p\u003e\n"],["\u003cp\u003eEnsure your app has a minSdkVersion of 21 or higher and a minimum device RAM of 1.7GB to use the API.\u003c/p\u003e\n"],["\u003cp\u003eOptimize performance by only requesting necessary output formats (JPEG and/or PDF).\u003c/p\u003e\n"]]],["The ML Kit document scanner API on Android enables adding a document scanning feature to apps. It requires Android API level 21+ and 1.7GB+ RAM. Implementation involves adding a dependency and configuring `GmsDocumentScannerOptions` to customize settings like gallery import, page limits, and output formats (JPEG/PDF). After obtaining an instance of `GmsDocumentScanner`, you use `Activity Result APIs` to start the scanner. The `GmsDocumentScanningResult` provides access to scanned pages' URIs and PDF details.\n"],null,["Document scanner with ML Kit on Android\n\nUse the ML Kit document scanner API to easily add a document scanner feature to\nyour app.\n\n| **Feature** | **Details** |\n|---------------------|--------------------------------------------------------------------------------------------|\n| Sdk name | play-services-mlkit-document-scanner |\n| Implementation | The models, scanning logic and UI flow are dynamically downloaded by Google Play services. |\n| App size impact | \\~300KB download size increase. |\n| Initialization time | Users might have to wait for the models, logic and UI flow to download before first use. |\n\nTry it out\n\nPlay around with the\n[sample app](https://github.com/googlesamples/mlkit/tree/master/android/documentscanner)\nto see an example usage of this API.\n\nBefore you begin **Note:** this API requires Android API level 21 or above. Make sure that your app's build file uses a minSdkVersion value of 21 or higher. It also requires a minimal [device total RAM](https://developer.android.com/reference/android/app/ActivityManager.MemoryInfo#totalMem) of 1.7GB. If lower, it returns an `MlKitException` with error code `UNSUPPORTED` when calling the API.\n\n1. In your project-level `build.gradle` file, make sure to include Google's\n Maven repository in both your buildscript and allprojects sections.\n\n2. Add the dependency for the ML Kit document scanner library to your\n module's app-level gradle file, which is usually app/build.gradle:\n\n dependencies {\n // ...\n implementation 'com.google.android.gms:play-services-mlkit-document-scanner:16.0.0-beta1'\n }\n\nDocument Scanner configuration\n\nThe document scanner user flow (which includes a dedicated viewfinder screen\nand preview screen) is provided by the SDK. The viewfinder and preview screen supports the following customizable controls:\n\n- importing from the photo gallery\n- setting a limit to the number of pages scanned\n- scanner mode (to control the feature sets in the flow)\n\nYou can retrieve both PDF and JPEG files for your scanned documents.\n\nInstantiate `GmsDocumentScannerOptions` to configure the scanner options: \n\nKotlin \n\n```scdoc\nval options = GmsDocumentScannerOptions.Builder()\n .setGalleryImportAllowed(false)\n .setPageLimit(2)\n .setResultFormats(RESULT_FORMAT_JPEG, RESULT_FORMAT_PDF)\n .setScannerMode(SCANNER_MODE_FULL)\n .build()\n```\n\nJava \n\n```scdoc\nGmsDocumentScannerOptions options = new GmsDocumentScannerOptions.Builder()\n .setGalleryImportAllowed(false)\n .setPageLimit(2)\n .setResultFormats(RESULT_FORMAT_JPEG, RESULT_FORMAT_PDF)\n .setScannerMode(SCANNER_MODE_FULL)\n .build();\n```\n\nScan documents\n\nAfter creating your `GmsDocumentScannerOptions`, get an\ninstance of `GmsDocumentScanner`. You can then start the scanner activity\nfollowing\n[Activity Result APIs](https://developer.android.com/training/basics/intents/result)\nintroduced in AndroidX.\n\nWhen the document scanning is complete, a `GmsDocumentScanningResult` object will give access to the number of pages scanned, the URIs of the\nimages in JPEG format and PDF accordingly to what was defined via\n`setResultFormats`: \n\nKotlin \n\n```verilog\nval scanner = GmsDocumentScanning.getClient(options)\nval scannerLauncher = registerForActivityResult(StartIntentSenderForResult()) {\n result -\u003e {\n if (result.resultCode == RESULT_OK) {\n val result =\n GmsDocumentScanningResult.fromActivityResultIntent(result.data)\n result.getPages()?.let { pages -\u003e\n for (page in pages) {\n val imageUri = pages.get(0).getImageUri()\n }\n }\n result.getPdf()?.let { pdf -\u003e\n val pdfUri = pdf.getUri()\n val pageCount = pdf.getPageCount()\n }\n }\n }\n}\n\nscanner.getStartScanIntent(activity)\n .addOnSuccessListener { intentSender -\u003e\n scannerLauncher.launch(IntentSenderRequest.Builder(intentSender).build())\n }\n .addOnFailureListener {\n ...\n }\n```\n\nJava \n\n```verilog\nGmsDocumentScanner scanner = GmsDocumentScanning.getClient(options);\nActivityResultLauncher\u003cIntentSenderRequest\u003e scannerLauncher =\n registerForActivityResult(\n new StartIntentSenderForResult(),\n result -\u003e {\n if (result.getResultCode() == RESULT_OK) {\n GmsDocumentScanningResult result = GmsDocumentScanningResult.fromActivityResultIntent(result.getData());\n for (Page page : result.getPages()) {\n Uri imageUri = pages.get(0).getImageUri();\n }\n\n Pdf pdf = result.getPdf();\n Uri pdfUri = pdf.getUri();\n int pageCount = pdf.getPageCount();\n }\n });\n\nscanner.getStartScanIntent(activity)\n .addOnSuccessListener(intentSender -\u003e\n scannerLauncher.launch(new IntentSenderRequest.Builder(intentSender).build()))\n .addOnFailureListener(...);\n```\n\nTips to improve performance\n\nConsider that generating document files takes time and requires processing\npower, so only request the output formats (JPEG, or PDF, or both) you actually\nneed."]]
