I am new to native android and have no idea about it , i am just in the initial stage of learning , i am following this tutorial , but this is giving me error . Following are my code
MainActivity.java
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewFrame;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener2;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.core.Mat;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
//package com.example.myapp
//Add imports here
public class MainActivity extends Activity implements CvCameraViewListener2 {
public native int convertNativeGray(long matAddrRgba, long matAddrGray);
private Mat mRgba;
private Mat mGray;
private final static String TAG = "MainActivity";
private CameraBridgeViewBase mOpenCvCameraView;
public native int convertNativeGray(int n);
//protected CameraBridgeViewBase mOpenCvCameraView;
// other part
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this)
{
@Override
public void onManagerConnected(int status) {
switch (status) {
case LoaderCallbackInterface.SUCCESS:
{
System.loadLibrary("nativegray");// Load Native module
//String TAG = null;
Log.i(TAG, "OpenCV loaded successfully");
//CameraBridgeViewBase mOpenCvCameraView = null;
mOpenCvCameraView.enableView();
} break;
default:
{
super.onManagerConnected(status);
} break;
}
}
};
// some more stuff
public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
mRgba = inputFrame.rgba();
convertNativeGray(mRgba.getNativeObjAddr(),
mGray.getNativeObjAddr());
return mGray;
}
@Override
public void onCameraViewStarted(int width, int height) {
// TODO Auto-generated method stub
}
@Override
public void onCameraViewStopped() {
// TODO Auto-generated method stub
}
}
This is my jni file
#include <jni.h>
#include "opencv2/core/core.hpp"
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <stdio.h>
using namespace std;
using namespace cv;
int toGray(Mat img, Mat& gray);
extern "C" {
JNIEXPORT jint JNICALL Java_com_nextin_filters_MainActivity_convertNativeGray(JNIEnv*, jobject, jlong addrRgba, jlong addrGray);
JNIEXPORT jint JNICALL Java_com_nextin_filters_MainActivity_convertNativeGray(JNIEnv*, jobject, jlong addrRgba, jlong addrGray) {
Mat& mRgb = *(Mat*)addrRgba;
Mat& mGray = *(Mat*)addrGray;
int conv;
jint retVal;
conv = toGray(mRgb, mGray);
retVal = (jint)conv;
return retVal;
}
}
int toGray(Mat img, Mat& gray)
{
cvtColor(img, gray, CV_RGBA2GRAY); // Assuming RGBA input
if (gray.rows == img.rows && gray.cols == img.cols)
{
return (1);
}
return(0);
}
and this is my Activity_main
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:opencv="http://schemas.android.com/apk/res-auto"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<org.opencv.android.NativeCameraView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:visibility="gone"
android:id="@+id/opencv_part_native_surface_view"
opencv:show_fps="true"
opencv:camera_id="any" />
<org.opencv.android.JavaCameraView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:visibility="gone"
android:id="@+id/opencv_part_java_surface_view"
opencv:show_fps="true"
opencv:camera_id="any" />
</LinearLayout>
This is manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.nextin.filters"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.myapp.Opencvpart"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera" android:required="false"/>
<uses-feature android:name="android.hardware.camera.autofocus" android:required="false"/>
<uses-feature android:name="android.hardware.camera.front" android:required="false"/>
<uses-feature android:name="android.hardware.camera.front.autofocus" android:required="false"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
</manifest>
Now the problem is that code is working fine , but when i run it on my device it just start but show nothing , it run with just the black screen .
Any help giving explanation is highly appriciated and helpful so that i can learn better how understand it better
Thanks
