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Android tutorial updated

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OpenCV version incremented;
New CvCameraViewListener interface description added.
pull/560/head
Alexander Smorkalov 12 years ago
parent 11885e86ee
commit 8458f5c489
3 changed files with 42 additions and 25 deletions
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  1. 14
      doc/tutorials/introduction/android_binary_package/O4A_SDK.rst
  2. 37
      doc/tutorials/introduction/android_binary_package/dev_with_OCV_on_Android.rst
  3. 16
      modules/java/generator/src/java/android+CameraBridgeViewBase.java

14
doc/tutorials/introduction/android_binary_package/O4A_SDK.rst
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@ -48,10 +48,10 @@ The structure of package contents looks as follows:
::
OpenCV-2.4.3-android-sdk
OpenCV-2.4.4-android-sdk
|_ apk
| |_ OpenCV_2.4.3_binary_pack_armv7a.apk
| |_ OpenCV_2.4.3_Manager_2.0_XXX.apk
| |_ OpenCV_2.4.4_binary_pack_armv7a.apk
| |_ OpenCV_2.4.4_Manager_2.6_XXX.apk
|
|_ doc
|_ samples
@ -157,10 +157,10 @@ Get the OpenCV4Android SDK
.. code-block:: bash
unzip ~/Downloads/OpenCV-2.4.3-android-sdk.zip
unzip ~/Downloads/OpenCV-2.4.4-android-sdk.zip
.. |opencv_android_bin_pack| replace:: OpenCV-2.4.3.2-android-sdk.zip
.. _opencv_android_bin_pack_url: http://sourceforge.net/projects/opencvlibrary/files/opencv-android/2.4.3/OpenCV-2.4.3.2-android-sdk.zip/download
.. |opencv_android_bin_pack| replace:: OpenCV-2.4.4-android-sdk.zip
.. _opencv_android_bin_pack_url: http://sourceforge.net/projects/opencvlibrary/files/opencv-android/2.4.4/OpenCV-2.4.4-android-sdk.zip/download
.. |opencv_android_bin_pack_url| replace:: |opencv_android_bin_pack|
.. |seven_zip| replace:: 7-Zip
.. _seven_zip: http://www.7-zip.org/
@ -295,7 +295,7 @@ Well, running samples from Eclipse is very simple:
.. code-block:: sh
:linenos:
<Android SDK path>/platform-tools/adb install <OpenCV4Android SDK path>/apk/OpenCV_2.4.3_Manager_armv7a-neon.apk
<Android SDK path>/platform-tools/adb install <OpenCV4Android SDK path>/apk/OpenCV_2.4.4_Manager_armv7a-neon.apk
.. note:: ``armeabi``, ``armv7a-neon``, ``arm7a-neon-android8``, ``mips`` and ``x86`` stand for
platform targets:

37
doc/tutorials/introduction/android_binary_package/dev_with_OCV_on_Android.rst
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@ -55,14 +55,14 @@ Manager to access OpenCV libraries externally installed in the target system.
:guilabel:`File -> Import -> Existing project in your workspace`.
Press :guilabel:`Browse` button and locate OpenCV4Android SDK
(:file:`OpenCV-2.4.3-android-sdk/sdk`).
(:file:`OpenCV-2.4.4-android-sdk/sdk`).
.. image:: images/eclipse_opencv_dependency0.png
:alt: Add dependency from OpenCV library
:align: center
#. In application project add a reference to the OpenCV Java SDK in
:guilabel:`Project -> Properties -> Android -> Library -> Add` select ``OpenCV Library - 2.4.3``.
:guilabel:`Project -> Properties -> Android -> Library -> Add` select ``OpenCV Library - 2.4.4``.
.. image:: images/eclipse_opencv_dependency1.png
:alt: Add dependency from OpenCV library
@ -128,27 +128,27 @@ described above.
#. Add the OpenCV library project to your workspace the same way as for the async initialization
above. Use menu :guilabel:`File -> Import -> Existing project in your workspace`,
press :guilabel:`Browse` button and select OpenCV SDK path
(:file:`OpenCV-2.4.3-android-sdk/sdk`).
(:file:`OpenCV-2.4.4-android-sdk/sdk`).
.. image:: images/eclipse_opencv_dependency0.png
:alt: Add dependency from OpenCV library
:align: center
#. In the application project add a reference to the OpenCV4Android SDK in
:guilabel:`Project -> Properties -> Android -> Library -> Add` select ``OpenCV Library - 2.4.3``;
:guilabel:`Project -> Properties -> Android -> Library -> Add` select ``OpenCV Library - 2.4.4``;
.. image:: images/eclipse_opencv_dependency1.png
:alt: Add dependency from OpenCV library
:align: center
#. If your application project **doesn't have a JNI part**, just copy the corresponding OpenCV
native libs from :file:`<OpenCV-2.4.3-android-sdk>/sdk/native/libs/<target_arch>` to your
native libs from :file:`<OpenCV-2.4.4-android-sdk>/sdk/native/libs/<target_arch>` to your
project directory to folder :file:`libs/<target_arch>`.
In case of the application project **with a JNI part**, instead of manual libraries copying you
need to modify your ``Android.mk`` file:
add the following two code lines after the ``"include $(CLEAR_VARS)"`` and before
``"include path_to_OpenCV-2.4.3-android-sdk/sdk/native/jni/OpenCV.mk"``
``"include path_to_OpenCV-2.4.4-android-sdk/sdk/native/jni/OpenCV.mk"``
.. code-block:: make
:linenos:
@ -221,7 +221,7 @@ taken:
.. code-block:: make
include C:\Work\OpenCV4Android\OpenCV-2.4.3-android-sdk\sdk\native\jni\OpenCV.mk
include C:\Work\OpenCV4Android\OpenCV-2.4.4-android-sdk\sdk\native\jni\OpenCV.mk
Should be inserted into the :file:`jni/Android.mk` file **after** this line:
@ -382,7 +382,7 @@ result.
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this, mLoaderCallback);
}
#. Defines that your activity implements CvViewFrameListener interface and fix activity related
#. Defines that your activity implements ``CvViewFrameListener2`` interface and fix activity related
errors by defining missed methods. For this activity define ``onCreate``, ``onDestroy`` and
``onPause`` and implement them according code snippet bellow. Fix errors by adding requited
imports.
@ -423,8 +423,8 @@ result.
public void onCameraViewStopped() {
}
public Mat onCameraFrame(Mat inputFrame) {
return inputFrame;
public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
return inputFrame.rgba();
}
#. Run your application on device or emulator.
@ -432,7 +432,7 @@ result.
Lets discuss some most important steps. Every Android application with UI must implement Activity
and View. By the first steps we create blank activity and default view layout. The simplest
OpenCV-centric application must implement OpenCV initialization, create its own view to show
preview from camera and implements ``CvViewFrameListener`` interface to get frames from camera and
preview from camera and implements ``CvViewFrameListener2`` interface to get frames from camera and
process it.
First of all we create our application view using xml layout. Our layout consists of the only
@ -448,8 +448,13 @@ After creating layout we need to implement ``Activity`` class. OpenCV initializa
been already discussed above. In this sample we use asynchronous initialization. Implementation of
``CvCameraViewListener`` interface allows you to add processing steps after frame grabbing from
camera and before its rendering on screen. The most important function is ``onCameraFrame``. It is
callback function and it is called on retrieving frame from camera. The callback input is frame
from camera. RGBA format is used by default. You can change this behavior by ``SetCaptureFormat``
method of ``View`` class. ``Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGBA`` and
``Highgui.CV_CAP_ANDROID_GREY_FRAME`` are supported. It expects that function returns RGBA frame
that will be drawn on the screen.
callback function and it is called on retrieving frame from camera. The callback input is object
of ``CvCameraViewFrame`` class that represents frame from camera.
.. note::
Do not save or use ``CvCameraViewFrame`` object out of ``onCameraFrame`` callback. This object
does not have its own state and its behavior out of callback is unpredictable!
It has ``rgba()`` and ``gray()`` methods that allows to get frame as RGBA and one channel gray scale
``Mat`` respectively. It expects that ``onCameraFrame`` function returns RGBA frame that will be
drawn on the screen.

16
modules/java/generator/src/java/android+CameraBridgeViewBase.java
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@ -156,9 +156,21 @@ public abstract class CameraBridgeViewBase extends SurfaceView implements Surfac
private CvCameraViewListener mOldStyleListener;
};
/**
* This class interface is abstract representation of single frame from camera for onCameraFrame callback
* Attention: Do not use objects, that represents this interface out of onCameraFrame callback!
*/
public interface CvCameraViewFrame {
public abstract Mat rgba();
public abstract Mat gray();
/**
* This method returns RGBA Mat with frame
*/
public Mat rgba();
/**
* This method returns single channel gray scale Mat with frame
*/
public Mat gray();
};
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {

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