ここからAndroid用のTesseractOCRをダウンロードし、NDKを使用して自分のアプリのライブラリプロジェクトとしてビルドしようとしています。ここでこれを行う方法について、いくつかの有益なフィードバックを受け取りました。まず、コマンドラインでこれを行います（[path]はtess-twoプロジェクトへのパスの省略形です）：
> cd [path]\tess-two
> C:\android-ndk-r8b-windows\android-ndk-r8b\ndk-build -j8
"Compile thumb : lept <= adaptmap.c
[...]
"Compile++ thumb : lept <= writefile.cpp
Prebuilt : libgnustl_static.a <= <NDK>/sources/cxx-stl/gnu-libstdc++/4.6/libs/armeabi/
"Compile++ thumb : tess <= applybox.cpp
[...]
"Compile++ thumb : tess <= tessbaseapi.cpp
"Compile thumb : lept <= adaptmap.c
[...]
"Compile++ thumb : lept <= pixa.cpp
Prebuilt : libgnustl_static.a <= <NDK>/sources/cxx-stl/gnu-libstdc++/4.6/libs/armeabi-v7a/
"Compile++ thumb : lept <= jni.cpp
[...]
"Compile++ thumb : tess <= tessbaseapi.cpp
"Compile x86 : lept <= affine.c
[...]
"Compile++ x86 : lept <= readfile.cpp
Prebuilt : libgnustl_static.a <= <NDK>/sources/cxx-stl/gnu-libstdc++/4.6/libs/x86/
"Compile++ x86 : tess <= baseapi.cpp
[...]
"Compile++ x86 : tess <= wordclass.cpp
SharedLibrary : liblept.so
SharedLibrary : liblept.so
"Compile++ x86 : tess <= tessbaseapi.cpp
SharedLibrary : liblept.so
"Compile++ x86 : tess <= wordrec.cpp
SharedLibrary : libtess.so
Install : liblept.so => libs/x86/liblept.so
Install : liblept.so => libs/armeabi/liblept.so
SharedLibrary : libtess.so
Install : liblept.so => libs/armeabi-v7a/liblept.so
SharedLibrary : libtess.so
Install : libtess.so => libs/armeabi/libtess.so
Install : libtess.so => libs/armeabi-v7a/libtess.so
Install : libtess.so => libs/x86/libtess.so
> C:\Users\User\android-sdk\tools\android.bat update project --path .
Failed to convert path to a short DOS path: C:\Windows\system32\java.exe
'javaw_exe' is not recognized as an internal or external command,
operable program or batch file.
Updated local.properties
Updated file [path]\tess-two\proguard-project.txt
It seems that there are sub-projects. If you want to update them
please use the --subprojects parameter.
> set JAVA_HOME=C:\Java\JDK
> Buildfile: [path]\tess-two\build.xml
-set-mode-check:
-set-release-mode:
-release-obfuscation-check:
[echo] proguard.config is ${proguard.config}
-check-env:
[checkenv] Android SDK Tools Revision 20.0.3
[checkenv] Installed at C:\Users\User\android-sdks
-setup:
[echo] Project Name: tess-two
[gettype] Project Type: Android Library
-build-setup:
[echo] Resolving Build Target for tess-two...
[gettarget] Project Target: Google APIs
[gettarget] Vendor: Google Inc.
[gettarget] Platform Version: 4.1
[gettarget] API level: 16
[echo] ----------
[echo] Creating output directories if needed...
[echo] ----------
[echo] Resolving Dependencies for tess-two...
[dependency] Library dependencies:
[dependency] No Libraries
[dependency]
[dependency] ------------------
[dependency] API<=15: Adding annotations.jar to the classpath.
[echo] ----------
[echo] Building Libraries with 'release'...
[subant] No sub-builds to iterate on
-pre-build:
-code-gen:
[mergemanifest] Found Deleted Target File
[mergemanifest] Merging AndroidManifest files into one.
[mergemanifest] Manifest merger disabled. Using project manifest only.
[echo] Handling aidl files...
[aidl] No AIDL files to compile.
[echo] ----------
[echo] Handling RenderScript files...
[renderscript] No RenderScript files to compile.
[echo] ----------
[echo] Handling Resources...
[aapt] Found new input file
[aapt] Generating resource IDs...
[echo] ----------
[echo] Handling BuildConfig class...
[buildconfig] No need to generate new BuildConfig.
-pre-compile:
-compile:
[echo] Creating library output jar file...
-post-compile:
-obfuscate:
-dex:
[echo] Library project: do not convert bytecode...
-crunch:
[crunch] Crunching PNG Files in source dir: [path]\tess-two\res
[crunch] To destination dir: [path]\tess-two\bin\res
[crunch] Crunched 0 PNG files to update cache
-package-resources:
[echo] Library project: do not package resources...
-package:
[echo] Library project: do not package apk...
-post-package:
-release-prompt-for-password:
-release-nosign:
[echo]
[propertyfile] Updating property file: [path]\tess-two\bin\build.prop
[propertyfile] Updating property file: [path]\tess-two\bin\build.prop
[propertyfile] Updating property file: [path]\tess-two\bin\build.prop
[propertyfile] Updating property file: [path]\tess-two\bin\build.prop
-release-sign:
-post-build:
release:
BUILD SUCCESSFUL
Total time: 1 second
次に、これを行います：ファイル->インポート->Android->ワークスペースへの既存のコード->参照->現在のワークスペースディレクトリの選択->表示されるリストでtess-twoが選択されていることを確認します->終了。
次に、自分のアプリを右クリックして、[プロパティ]->[Android]タブ->[追加...]（[ライブラリ]セクションの下）->[tess-two]を選択->[OK]をクリック->[ライブラリ]->[OK]をオンにします。
ただし、この後も、アプリを実行すると次のエラーが発生します。
09-23 13:02:42.532: E/AndroidRuntime(675): Caused by: java.lang.UnsatisfiedLinkError: Couldn't load lept: findLibrary returned null
09-23 13:02:42.532: E/AndroidRuntime(675): at java.lang.Runtime.loadLibrary(Runtime.java:365)
09-23 13:02:42.532: E/AndroidRuntime(675): at java.lang.System.loadLibrary(System.java:535)
09-23 13:02:42.532: E/AndroidRuntime(675): at com.googlecode.tesseract.android.TessBaseAPI.<clinit>(TessBaseAPI.java:47)
私自身のアプリのproject.propertiesは次のとおりです。
target=android-16
android.library.reference.1=..\\OpenCV\\sdk\\java
android.library.reference.2=../Tesseract/tess-two
android.library=true
どうしたの？