1 OpenCV4Android SDK {#tutorial_O4A_SDK}
4 @prev_tutorial{tutorial_android_dev_intro}
5 @next_tutorial{tutorial_dev_with_OCV_on_Android}
8 This tutorial was designed to help you with installation and configuration of OpenCV4Android SDK.
10 This guide was written with MS Windows 7 in mind, though it should work with GNU Linux and Apple Mac
13 This tutorial assumes you have the following software installed and configured:
18 - ADT and CDT plugins for Eclipse
20 If you need help with anything of the above, you may refer to our @ref tutorial_android_dev_intro guide.
22 If you encounter any error after thoroughly following these steps, feel free to contact us via
23 [OpenCV4Android](https://groups.google.com/group/android-opencv/) discussion group or OpenCV [Q&A
24 forum](http://answers.opencv.org). We'll do our best to help you out.
26 Tegra Android Development Pack users
27 ------------------------------------
29 You may have used [Tegra Android Development
30 Pack](http://developer.nvidia.com/tegra-android-development-pack) (**TADP**) released by **NVIDIA**
31 for Android development environment setup.
33 Beside Android development tools the TADP 2.0 includes OpenCV4Android SDK, so it can be already
34 installed in your system and you can skip to @ref tutorial_O4A_SDK_samples "samples" section of this tutorial.
36 More details regarding TADP can be found in the @ref tutorial_android_dev_intro guide.
41 OpenCV4Android SDK package enables development of Android applications with use of OpenCV library.
43 The structure of package contents looks as follows:
45 OpenCV-2.4.9-android-sdk
47 | |_ OpenCV_2.4.9_binary_pack_armv7a.apk
48 | |_ OpenCV_2.4.9_Manager_2.18_XXX.apk
66 - `sdk` folder contains OpenCV API and libraries for Android:
67 - `sdk/java` folder contains an Android library Eclipse project providing OpenCV Java API that can
68 be imported into developer's workspace;
69 - `sdk/native` folder contains OpenCV C++ headers (for JNI code) and native Android libraries
70 (\*.so and \*.a) for ARM-v5, ARM-v7a and x86 architectures;
71 - `sdk/etc` folder contains Haar and LBP cascades distributed with OpenCV.
72 - `apk` folder contains Android packages that should be installed on the target Android device to
73 enable OpenCV library access via OpenCV Manager API (see details below).
75 On production devices that have access to Google Play Market (and Internet) these packages will
76 be installed from Market on the first start of an application using OpenCV Manager API. But
77 devkits without Market or Internet connection require this packages to be installed manually.
78 Install the Manager.apk and optional binary_pack.apk if it needed. See `Manager Selection`
81 @note Installation from Internet is the preferable way since OpenCV team may publish updated
82 versions of this packages on the Market.
84 - `samples` folder contains sample applications projects
85 and their prebuilt packages (APK). Import them into Eclipse workspace (like described below) and
86 browse the code to learn possible ways of OpenCV use on Android.
88 - `doc` folder contains various OpenCV documentation in PDF format. It's also available online at
89 <http://docs.opencv.org>.
90 @note The most recent docs (nightly build) are at <http://docs.opencv.org/3.4>. Generally, it's more
91 up-to-date, but can refer to not-yet-released functionality.
92 @todo I'm not sure that this is the best place to talk about OpenCV Manager
94 Starting from version 2.4.3 OpenCV4Android SDK uses OpenCV Manager API for library initialization.
95 OpenCV Manager is an Android service based solution providing the following benefits for OpenCV
96 applications developers:
98 - Compact apk-size, since all applications use the same binaries from Manager and do not store
99 native libs within themselves;
100 - Hardware specific optimizations are automatically enabled on all supported platforms;
101 - Automatic updates and bug fixes;
102 - Trusted OpenCV library source. All packages with OpenCV are published on Google Play;
105 Manual OpenCV4Android SDK setup
106 -------------------------------
108 ### Get the OpenCV4Android SDK
110 -# Go to the [OpenCV download page on
111 SourceForge](http://sourceforge.net/projects/opencvlibrary/files/) and download
112 the latest available version. This tutorial is based on this package: [OpenCV-2.4.9-android-sdk.zip](http://sourceforge.net/projects/opencvlibrary/files/opencv-android/2.4.9/OpenCV-2.4.9-android-sdk.zip/download).
113 -# Create a new folder for Android with OpenCV development. For this tutorial we have unpacked
114 OpenCV SDK to the `C:\Work\OpenCV4Android\` directory.
116 @note Better to use a path without spaces in it. Otherwise you may have problems with ndk-build.
118 -# Unpack the SDK archive into the chosen directory.
120 You can unpack it using any popular archiver (e.g with 7-Zip):
122 ![](images/android_package_7zip.png)
124 On Unix you can use the following command:
126 unzip ~/Downloads/OpenCV-2.4.9-android-sdk.zip
129 ### Import OpenCV library and samples to the Eclipse
131 -# Start Eclipse and choose your workspace location.
133 We recommend to start working with OpenCV for Android from a new clean workspace. A new Eclipse
134 workspace can for example be created in the folder where you have unpacked OpenCV4Android SDK
137 ![](images/eclipse_1_choose_workspace.png)
139 -# Import OpenCV library and samples into workspace.
141 OpenCV library is packed as a ready-for-use [Android Library
142 Project](http://developer.android.com/guide/developing/projects/index.html#LibraryProjects). You
143 can simply reference it in your projects.
145 Each sample included into the `OpenCV-2.4.9-android-sdk.zip` is a regular Android project that
146 already references OpenCV library. Follow the steps below to import OpenCV and samples into the
149 - Right click on the Package Explorer window and choose Import... option from the context
152 ![](images/eclipse_5_import_command.png)
154 - In the main panel select General --\> Existing Projects into Workspace and press Next
157 ![](images/eclipse_6_import_existing_projects.png)
159 - In the Select root directory field locate your OpenCV package folder. Eclipse should
160 automatically locate OpenCV library and samples:
162 ![](images/eclipse_7_select_projects.png)
164 - Click Finish button to complete the import operation.
166 @note OpenCV samples are indeed **dependent** on OpenCV library project so don't forget to import it to your workspace as well.
168 After clicking Finish button Eclipse will load all selected projects into workspace, and you
169 have to wait some time while it is building OpenCV samples. Just give a minute to Eclipse to
170 complete initialization.
172 ![](images/eclipse_cdt_cfg4.png)
174 Once Eclipse completes build you will have the clean workspace without any build errors:
176 ![](images/eclipse_10_crystal_clean.png)
178 @anchor tutorial_O4A_SDK_samples
179 ### Running OpenCV Samples
181 At this point you should be able to build and run the samples. Keep in mind, that face-detection and
182 Tutorial 2 - Mixed Processing include some native code and require Android NDK and NDK/CDT plugin
183 for Eclipse to build working applications. If you haven't installed these tools, see the
184 corresponding section of @ref tutorial_android_dev_intro.
188 Please consider that some samples use Android Java Camera API, which is accessible with an AVD.
190 @note Recent *Android SDK tools, revision 19+* can run ARM v7a OS images but they available not for
191 all Android versions.
193 Well, running samples from Eclipse is very simple:
195 - Connect your device with adb tool from Android SDK or create an emulator with camera support.
196 - See [Managing Virtual Devices](http://developer.android.com/guide/developing/devices/index.html) document for help
197 with Android Emulator.
198 - See [Using Hardware Devices](http://developer.android.com/guide/developing/device.html) for
199 help with real devices (not emulators).
201 - Select project you want to start in Package Explorer and just press Ctrl + F11 or select option
202 Run --\> Run from the main menu, or click Run button on the toolbar.
204 @note Android Emulator can take several minutes to start. So, please, be patient. \* On the first
205 run Eclipse will ask you about the running mode for your application:
207 ![](images/eclipse_11_run_as.png)
209 - Select the Android Application option and click OK button. Eclipse will install and run the
212 Chances are that on the first launch you will not have the [OpenCV
213 Manager](https://docs.google.com/a/itseez.com/presentation/d/1EO_1kijgBg_BsjNp2ymk-aarg-0K279_1VZRcPplSuk/present#slide=id.p)
214 package installed. In this case you will see the following message:
216 ![](images/android_emulator_opencv_manager_fail.png)
218 To get rid of the message you will need to install OpenCV Manager and the appropriate
219 OpenCV binary pack. Simply tap Yes if you have *Google Play Market* installed on your
220 device/emulator. It will redirect you to the corresponding page on *Google Play Market*.
222 If you have no access to the *Market*, which is often the case with emulators - you will need to
223 install the packages from OpenCV4Android SDK folder manually. See `Manager Selection` for
226 <Android SDK path>/platform-tools/adb install <OpenCV4Android SDK path>/apk/OpenCV_2.4.9_Manager_2.18_armv7a-neon.apk
229 @note armeabi, armv7a-neon, arm7a-neon-android8, mips and x86 stand for platform targets:
230 - armeabi is for ARM v5 and ARM v6 architectures with Android API 8+,
231 - armv7a-neon is for NEON-optimized ARM v7 with Android API 9+,
232 - arm7a-neon-android8 is for NEON-optimized ARM v7 with Android API 8,
233 - mips is for MIPS architecture with Android API 9+,
234 - x86 is for Intel x86 CPUs with Android API 9+.
237 If using hardware device for testing/debugging, run the following command to learn its CPU
240 adb shell getprop ro.product.cpu.abi
242 If you're using an AVD emulator, go Window \> AVD Manager to see the list of available devices.
243 Click Edit in the context menu of the selected device. In the window, which then pop-ups, find
247 You may also see section `Manager Selection` for details.
249 When done, you will be able to run OpenCV samples on your device/emulator seamlessly.
251 - Here is Sample - image-manipulations sample, running on top of stock camera-preview of the
254 ![](images/emulator_canny.png)
259 Now, when you have your instance of OpenCV4Adroid SDK set up and configured, you may want to proceed
260 to using OpenCV in your own application. You can learn how to do that in a separate @ref tutorial_dev_with_OCV_on_Android tutorial.