Bug #2759 android.os.DeadObjectException on OpenCV Manager connection fixed.

DeleteLocalRef calls for jclass objects added.

android/service/engine/jni/JNIWrapper/JavaBasedPackageManager.cpp

@@ -46,7 +46,9 @@ bool JavaBasedPackageManager::InstallPackage(const PackageInfo& package)
     LOGD("Calling java package manager with package name %s\n", package.GetFullName().c_str());
     jobject jpkgname = jenv->NewStringUTF(package.GetFullName().c_str());
     bool result = jenv->CallNonvirtualBooleanMethod(JavaPackageManager, jclazz, jmethod, jpkgname);
+
     jenv->DeleteLocalRef(jpkgname);
+    jenv->DeleteLocalRef(jclazz);
 
     if (self_attached)
     {
@@ -104,9 +106,12 @@ vector<PackageInfo> JavaBasedPackageManager::GetInstalledPackages()
 
         if (tmp.IsValid())
             result.push_back(tmp);
+
+        jenv->DeleteLocalRef(jtmp);
     }
 
     jenv->DeleteLocalRef(jpkgs);
+    jenv->DeleteLocalRef(jclazz);
 
     if (self_attached)
     {
@@ -118,6 +123,16 @@ vector<PackageInfo> JavaBasedPackageManager::GetInstalledPackages()
     return result;
 }
 
+static jint GetAndroidVersion(JNIEnv* jenv)
+{
+    jclass jclazz = jenv->FindClass("android/os/Build$VERSION");
+    jfieldID jfield = jenv->GetStaticFieldID(jclazz, "SDK_INT", "I");
+    jint api_level = jenv->GetStaticIntField(jclazz, jfield);
+    jenv->DeleteLocalRef(jclazz);
+
+    return api_level;
+}
+
 // IMPORTANT: This method can be called only if thread is attached to Dalvik
 PackageInfo JavaBasedPackageManager::ConvertPackageFromJava(jobject package, JNIEnv* jenv)
 {
@@ -133,23 +148,27 @@ PackageInfo JavaBasedPackageManager::ConvertPackageFromJava(jobject package, JNI
     const char* jversionstr = jenv->GetStringUTFChars(jversionobj, NULL);
     string verison(jversionstr);
     jenv->DeleteLocalRef(jversionobj);
+    jenv->DeleteLocalRef(jclazz);
 
+    static const jint api_level = GetAndroidVersion(jenv);
     string path;
-    jclazz = jenv->FindClass("android/os/Build$VERSION");
-    jfield = jenv->GetStaticFieldID(jclazz, "SDK_INT", "I");
-    jint api_level = jenv->GetStaticIntField(jclazz, jfield);
     if (api_level > 8)
     {
         jclazz = jenv->GetObjectClass(package);
         jfield = jenv->GetFieldID(jclazz, "applicationInfo", "Landroid/content/pm/ApplicationInfo;");
         jobject japp_info = jenv->GetObjectField(package, jfield);
+        jenv->DeleteLocalRef(jclazz);
+
         jclazz = jenv->GetObjectClass(japp_info);
         jfield = jenv->GetFieldID(jclazz, "nativeLibraryDir", "Ljava/lang/String;");
         jstring jpathobj = static_cast<jstring>(jenv->GetObjectField(japp_info, jfield));
         const char* jpathstr = jenv->GetStringUTFChars(jpathobj, NULL);
         path = string(jpathstr);
         jenv->ReleaseStringUTFChars(jpathobj, jpathstr);
+
+        jenv->DeleteLocalRef(japp_info);
         jenv->DeleteLocalRef(jpathobj);
+        jenv->DeleteLocalRef(jclazz);
     }
     else
     {