Android Native Apps Development
Upcoming SlideShare
Loading in...5
×
 

Like this? Share it with your network

Share

Android Native Apps Development

on

  • 1,063 views

Palestra ministrada por Eduardo Carrara no App Lab Android realizado no auditório da Intel no dia 11 de Outubro de 2013.

Palestra ministrada por Eduardo Carrara no App Lab Android realizado no auditório da Intel no dia 11 de Outubro de 2013.

Statistics

Views

Total Views
1,063
Views on SlideShare
925
Embed Views
138

Actions

Likes
0
Downloads
11
Comments
0

9 Embeds 138

http://software.intel.com 110
http://intel239.rssing.com 7
http://intel1520.rssing.com 6
http://santeria36.rssing.com 5
http://plus.url.google.com 4
http://leaden-footed27.rssing.com 2
http://intel801.rssing.com 2
http://cloud.feedly.com 1
http://intel356.rssing.com 1
More...

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment
  • Reuso de códigolegadoounão.
  • http://docs.oracle.com/javase/6/docs/technotes/guides/jni/http://docs.oracle.com/javase/6/docs/technotes/guides/jni/spec/intro.htmlSuacriaçãofoifeitaparaunificar a forma de fornecercódigonativopara a JVM, desta forma:Vendors de diferentes JVMs e criadores de ferramentasnãoprecisariammais se preocupar com a implementação de diferentes interfaces;Desenvolvedorespoderiamcriarumaversão de seucódigonativo e elefuncionariajunto com diferentes VMsNo final substituipadrões de interfaceamentocomo o Netscape JRI, Microsoft RNI e o COM.O que é possívelfazer com jni:Criar, inspecionar e atualizarobjetos JavaChamarmétodos JavaPegar e lançarexceçõesCarregar classes e obtersuasinformaçõesEfetuarverificação de tiposdurante a execução
  • Default system STL support: cassertcctypecerrnocfloatclimitscmathcsetjmpcsignalcstddefcstdintcstdiocstdlibcstringctimecwchar new stl_pair.htypeinfo utilityAnything else is _not_ supported, including std::string or std::vector.Static linking is only supported if the application has only one native moduleDon’t forget to load the used library before yours (ieSystem.loadLibrary("stlport_shared"); )LOCAL_CPPFLAGS := -frtti –fexceptions also works, but LOCAL_CPP_FEATURES is a cleaner way to declare it.Source:ndk\docs\CPLUSPLUS-SUPPORT.html
  • Com um projeto Android jácriado é possíveladicionarsuporte àumabibliotecanativautilizando o próprio Eclipse*
  • Credit: TodorMinchevSystem.loadLibrary() will automatically translate MyLib to libMyLib.soThat’s better than using System.load() that takes the path to the .so file.IDZ:To use native c/c++ code in our java source file, we first need to declare JNI call and load the native library.This is a very simple case for declaring and using JNI native calls in Android* App Java sources. Next, there is two solutions: use “javah” tool to generate the JNI header stubs for native code, and add or modify native code to comply with JNI native headers, or load C++ library and map native calls during class load.
  • http://docs.oracle.com/javase/7/docs/technotes/tools/windows/javah.htmlSource: http://software.intel.com/en-us/articles/creating-and-porting-ndk-based-android-apps-for-ia
  • http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.htmljstringJava_ -> Java spacecom_example_hellojni_ -> com.example.hellojni packageHelloJni_ -> HelloJni classstringFromJNI( -> stringFromJNI methodJNIEnv* env, -> JNI environmentjobjectthiz) -> HelloJNIjobject instanceSource: IDZ
  • Proven method: That’s how native code is integrated in AOSP itself : http://code.metager.de/source/xref/android/4.0.3/frameworks-base/services/jni/You get all the native methods registration issues during the load of the library instead of during further function callsYou get rid of functions with a lengthy name that will break when refactoring other parts of the codeYou can add/remove native functions easily (you don’t need to write error prone names by hand or re-run javah and copy/paste parts of it)There is no more potential issue with symbol table (really useful when you want to mix C/C++ code)It is also the best spot to cache Java class/objects references
  • Javap => Java Class File Disassembler (http://docs.oracle.com/javase/7/docs/technotes/tools/windows/javap.html)Here it is in C++ as this method is the most useful for C++ code.You’ll see on a following slide the only difference between C and C++ JNI codes.Java VM’s representation of type signatures:http://docs.oracle.com/javase/6/docs/technotes/guides/jni/spec/types.html#wp16432Complete output of javap:C:\Users\xhallade\workspace\HelloJni>javap -s -classpath bin\classes -p com.example.hellojni.HelloJniCompiled from "HelloJni.java"public class com.example.hellojni.HelloJni extends android.app.Activity{static {}; Signature: ()Vpublic com.example.hellojni.HelloJni(); Signature: ()Vpublic void onCreate(android.os.Bundle); Signature: (Landroid/os/Bundle;)Vpublic native java.lang.StringstringFromJNI(); Signature: ()Ljava/lang/String;public native java.lang.StringunimplementedStringFromJNI(); Signature: ()Ljava/lang/String;}
  • Add this function to your library. It will be the entry point called during load of your library and it is doing the mapping previously defined.It’s also a good place to get the reference to the JavaVM and other objects (like the main activity) to cache them.Source: developer.android.com and marakana android NDK series
  • ABI = Android Binary Interfaceadb shell getprop | grepabi
  • Se vocêchegouatéaquiparabéns! Agora sua app estáredonda e vocêpodedistribuir. Será?E quandoos bugs aparecemcomodebugarseusmódulosnativos?
  • You may be limited to 16 local references within your JNI environment, so don’t forget to call DeleteLocalRef() after use.
  • Don’t count on these automatically frees too much
  • Previous call for creating a String may return a null object, then it’s likely that an exception has occured.Here is the way to get that exception.
  • You CANNOT do everything in C/C++, only a restricted amount of libraries are exposed in C.Calling Java methods from C/C++ is something you may have to do extensively.Java VM’s representation of type signatures:http://docs.oracle.com/javase/6/docs/technotes/guides/jni/spec/types.html#wp16432http://docs.oracle.com/javase/6/docs/technotes/guides/jni/spec/functions.html

Android Native Apps Development Presentation Transcript

  • 1. Desenvolvendo Apps Nativas com NDK Eduardo Carrara de Araujo Software Analyst – Intel Software
  • 2. Agenda • • • • • • Entendendo o mundo Android* Nativo Conhecendo suas ferramentas Preparando-se para a batalha Mãos à obra! Quebrou! E agora? Q&A 2
  • 3. Entendendo o mundo Android* Nativo INTEL CONFIDENTIAL
  • 4. Apps Home Application Framework User Experience Apps As Engrenagens do Robô Contacts Phone Browser Activity Manager Windows* Manager Content Providers View System Package Manager Telephony Manager Resource Manager Location Manager Libraries … Notification Manager Android* Runtime Surface Manager Media Framework SQLite OpenGL* ES FreeType WebKit SGL Middleware … SSL libc Core Libraries Dalvik Virtual Machine … Operating System Linux* Kernel 4 Display Driver Camera Driver Flash Memory Driver Binder (IPC) Driver Keypad Driver WiFi Driver Audio Drivers Power Management
  • 5. Nativo VS. Dalvik* • O que é uma aplicação Android* nativa? • O que a Intel já faz por você? Android Runtime Dalvik Virtual Machine Core Libraries 5
  • 6. Por quê utilizar código nativo? Performance Jogos Processamento Gráfico Criptografia Algoritmos de baixo nível Acesso direto à CPU, GPU e outros recursos de HW • Reuso de código • E por que não utilizar? • • • • • • • Performance • Complexidade 6
  • 7. Conhecendo suas ferramentas 7 INTEL CONFIDENTIAL
  • 8. Android* Native Development Kit (NDK) • O que é? • Conjunto de ferramentas que permitem a implementação de partes da aplicação Android utilizando código nativo em linguagens como C ou C++. • A interação entre o código nativo e a app Android é feita utilizando Java Native Interface (JNI).
  • 9. Java Native Interface (JNI) • O que é? • Interface padrão de programação para interoperabilidade entre bibliotecas nativas de uma plataforma e a máquina virtual Java. • Quando usar? • Acessar funcionalidades dependentes de plataforma não providas pela API padrão do Java. • Re-uso de código. • Porções de código que precisam de tuning de performance. 9
  • 10. Fluxo de Desenvolvimento com NDK C/C++ Code ndkbuild Makefile Java* calls GDB debug JNI APP_ABI := all or APP_ABI := x86 Android* ApplicationsJava Application SDK APIs Java Framework JNI Native Libs Bionic C Library 10 NDK APIs
  • 11. Conheça os limites: A Bionic C • Biblioteca C otimizada para a plataforma Android. • Mais leve que a GNU C. • Não segue o padrão POSIX. • Suporte limitado à pthreads. • Acesso às propriedades do Android 12
  • 12. Preparando-se para a batalha 14 INTEL CONFIDENTIAL
  • 13. Instalando o Android* NDK • Baixe o SDK: http://developer.android.com/too ls/sdk/ndk • Baixe o Intel Beacon Mountain: http://software.intel.com/enus/vcsource/tools/beaconmountai n • Integre com o ADT e o CDT no Eclipse*
  • 14. Adicionando Suporte Nativo (Eclipse*) 16
  • 15. Sem o piloto automático Standard Android* Project Structure 1. Create JNI folder for native sources Native Sources - JNI Folder 2. Reuse or create native c/c++ sources 3. Create Android.mk Makefile NDK-BUILD will automatically create ABI libs folders. 4. Build Native libraries using NDKBUILD script. 17
  • 16. Mãos à obra! INTEL CONFIDENTIAL
  • 17. Hello NDK! • Agora que temos um projeto pronto para utilizar código nativo. Qual o próximo passo? • Como integrar o código Java com o C++? 19
  • 18. Integrando Funções Nativas com Java • Declarar métodos nativos em Java: • public native String getHelloMessage(); • A aplicação Java deve carregar a biblioteca antes de utilizá-la: • System.loadLibrary("HelloNDK"); • Implementar em sua biblioteca nativa os métodos a serem utilizados pela aplicação • Os pontos de entrada da biblioteca podem ser criados de duas formas: com a ferramenta Javah ou as registrando na função JNI_onLoad na biblioteca. 20
  • 19. Javah • Gera os “header stubs” apropriados para JNI à partir das classes Java já compiladas. • Example: > javah –d jni –classpath bin/classes com.example.hellojni.HelloJni • Gera o arquivo: com_example_hellojni_HelloJni.h • Com a definição: JNIEXPORT jstring JNICALL Java_com_example_hellojni_HelloJni_stringFromJNI(JN IEnv *, jobject); 21
  • 20. Javah ... { ... tv.setText( stringFromJNI() ); ... } public native String stringFromJNI(); static { System.loadLibrary("hello-jni"); } jstring Java_com_example_hellojni_HelloJni_stringFromJNI(JNIEnv* env, jobject thiz ) { return (*env)->NewStringUTF(env, "Hello from JNI !"); }
  • 21. JNI_onLoad • Registro das funções JNI no carregamento da biblioteca. • Utilizado nos módulos nativos do AOSP. • Sujeito a menos erros durante refatoração. • Melhor local para lidar com o caching de referências à objetos Java. 23
  • 22. JNI_onLoad • Declare a função C++ em sua lib: jstring stringFromJNI(JNIEnv* env, jobject thiz) { return env->NewStringUTF("Hello from JNI !"); } • Crie o mapeamento de funções expostas: static JNINativeMethod exposedMethods[] = { {"stringFromJNI","()Ljava/lang/String;",(void*)stringFromJNI},} • Utilize a ferramenta javap para obter a assinatura dos métodos nativos: javap -s -classpath binclasses -p com.example.hellojni.HelloJni -> Signature: ()Ljava/lang/String; 24
  • 23. JNI_onLoad extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved) { JNIEnv* env; if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) return JNI_ERR; jclass clazz = env>FindClass("com/intel/applab/nativesample/NativeSample"); if(clazz==NULL) return JNI_ERR; env->RegisterNatives(clazz, exposedMethods, sizeof(exposedMethods)/sizeof(JNINativeMethod)); env->DeleteLocalRef(clazz); return JNI_VERSION_1_6; } 25
  • 24. Estamos prontos? Não! • Utilizar o arquivo Application.mk para descrever sua app: • • • • Diretório: jni Descrever os módulos necessários Arquiteturas suportadas: ABI Arquivo opcional mas importante para garantir que seus módulos nativos sejam compilados para diversas plataformas. APP_ABI := armeabi armeabi-v7a x86 Ou APP_ABI := all 26
  • 25. Build it! • Utilizando Eclipse* • Com a integração ADT e NDK no Eclipse* basta compilar a app para gerar as bibliotecas e empacotar seu apk. • Hardcore Mode • Utilizar o script ndk_build para gerar os módulos. • No diretório raíz de sua app execute: • $NDK/ndk_build 27
  • 26. Quebrou! E agora? INTEL CONFIDENTIAL
  • 27. LogCat • Mecanismo básico de logs do Android. No NDK pode ser acessado pela API: <android/log.h> • int __android_log_print(int prio, const char *tag, const char *fmt, ...) • Normalmente utilizado com a macro: • #define LOGI(...) ((void)__android_log_print(ANDROID_LOG_INFO, "APPTAG", __VA_ARGS__)) • Exemplo • LOGI("accelerometer: x=%f y=%f z=%f", x, y, z); 29
  • 28. Q&A 31 INTEL CONFIDENTIAL
  • 29. Legal Disclaimer INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL'S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. A "Mission Critical Application" is any application in which failure of the Intel Product could result, directly or indirectly, in personal injury or death. SHOULD YOU PURCHASE OR USE INTEL'S PRODUCTS FOR ANY SUCH MISSION CRITICAL APPLICATION, YOU SHALL INDEMNIFY AND HOLD INTEL AND ITS SUBSIDIARIES, SUBCONTRACTORS AND AFFILIATES, AND THE DIRECTORS, OFFICERS, AND EMPLOYEES OF EACH, HARMLESS AGAINST ALL CLAIMS COSTS, DAMAGES, AND EXPENSES AND REASONABLE ATTORNEYS' FEES ARISING OUT OF, DIRECTLY OR INDIRECTLY, ANY CLAIM OF PRODUCT LIABILITY, PERSONAL INJURY, OR DEATH ARISING IN ANY WAY OUT OF SUCH MISSION CRITICAL APPLICATION, WHETHER OR NOT INTEL OR ITS SUBCONTRACTOR WAS NEGLIGENT IN THE DESIGN, MANUFACTURE, OR WARNING OF THE INTEL PRODUCT OR ANY OF ITS PARTS. Intel may make changes to specifications and product descriptions at any time, without notice. Designers must not rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined". Intel reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them. The information here is subject to change without notice. Do not finalize a design with this information. The products described in this document may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current characterized errata are available on request. Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order. Copies of documents which have an order number and are referenced in this document, or other Intel literature, may be obtained by calling 1-800-548-4725, or go to: http://www.intel.com/design/literature.htm Silvermont and other code names featured are used internally within Intel to identify products that are in development and not yet publicly announced for release. Customers, licensees and other third parties are not authorized by Intel to use code names in advertising, promotion or marketing of any product or services and any such use of Intel's internal code names is at the sole risk of the user. Intel, Atom, Look Inside and the Intel logo are trademarks of Intel Corporation in the United States and other countries. *Other names and brands may be claimed as the property of others. Copyright ©2013 Intel Corporation. 32
  • 30. Legal Disclaimer • Roadmap Notice: All products, computer systems, dates and figures specified are preliminary based on current expectations, and are subject to change without notice. • Intel® Virtualization Technology (Intel® VT) requires a computer system with an enabled Intel® processor, BIOS, and virtual machine monitor (VMM). Functionality, performance or other benefits will vary depending on hardware and software configurations. Software applications may not be compatible with all operating systems. Consult your PC manufacturer. For more information, visit http://www.intel.com/go/virtualization. • Software Source Code Disclaimer: Any software source code reprinted in this document is furnished under a software license and may only be used or copied in accordance with the terms of that license. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 33
  • 31. Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice. Notice revision #20110804 34
  • 32. Risk Factors The above statements and any others in this document that refer to plans and expectations for the third quarter, the year and the future are forward-looking statements that involve a number of risks and uncertainties. Words such as “anticipates,” “expects,” “intends,” “plans,” “believes,” “seeks,” “estimates,” “may,” “will,” “should” and their variations identify forward-looking statements. Statements that refer to or are based on projections, uncertain events or assumptions also identify forward-looking statements. Many factors could affect Intel’s actual results, and variances from Intel’s current expectations regarding such factors could cause actual results to differ materially from those expressed in these forward-looking statements. Intel presently considers the following to be the important factors that could cause actual results to differ materially from the company’s expectations. Demand could be different from Intel's expectations due to factors including changes in business and economic conditions; customer acceptance of Intel’s and competitors’ products; supply constraints and other disruptions affecting customers; changes in customer order patterns including order cancellations; and changes in the level of inventory at customers. Uncertainty in global economic and financial conditions poses a risk that consumers and businesses may defer purchases in response to negative financial events, which could negatively affect product demand and other related matters. Intel operates in intensely competitive industries that are characterized by a high percentage of costs that are fixed or difficult to reduce in the short term and product demand that is highly variable and difficult to forecast. Revenue and the gross margin percentage are affected by the timing of Intel product introductions and the demand for and market acceptance of Intel's products; actions taken by Intel's competitors, including product offerings and introductions, marketing programs and pricing pressures and Intel’s response to such actions; and Intel’s ability to respond quickly to technological developments and to incorporate new features into its products. The gross margin percentage could vary significantly from expectations based on capacity utilization; variations in inventory valuation, including variations related to the timing of qualifying products for sale; changes in revenue levels; segment product mix; the timing and execution of the manufacturing ramp and associated costs; start-up costs; excess or obsolete inventory; changes in unit costs; defects or disruptions in the supply of materials or resources; product manufacturing quality/yields; and impairments of long-lived assets, including manufacturing, assembly/test and intangible assets. Intel's results could be affected by adverse economic, social, political and physical/infrastructure conditions in countries where Intel, its customers or its suppliers operate, including military conflict and other security risks, natural disasters, infrastructure disruptions, health concerns and fluctuations in currency exchange rates. Expenses, particularly certain marketing and compensation expenses, as well as restructuring and asset impairment charges, vary depending on the level of demand for Intel's products and the level of revenue and profits. Intel’s results could be affected by the timing of closing of acquisitions and divestitures. Intel's results could be affected by adverse effects associated with product defects and errata (deviations from published specifications), and by litigation or regulatory matters involving intellectual property, stockholder, consumer, antitrust, disclosure and other issues, such as the litigation and regulatory matters described in Intel's SEC reports. An unfavorable ruling could include monetary damages or an injunction prohibiting Intel from manufacturing or selling one or more products, precluding particular business practices, impacting Intel’s ability to design its products, or requiring other remedies such as compulsory licensing of intellectual property. A detailed discussion of these and other factors that could affect Intel’s results is included in Intel’s SEC filings, including the company’s most recent reports on Form 10-Q, Form 10-K and earnings release. 35
  • 33. Backup
  • 34. Handling JVM and Java objects from native code
  • 35. Memory handling of Java objects • Memory handling of Java objects is done by the JVM: • You only deal with references to these objects. • Each time you get a reference, you must not forget to delete it after use so the JVM can free it later • local references are automatically freed when the native call returns to Java • Global references are only created by NewGlobalRef()
  • 36. Creating a Java string C: jstring string = (*env)->NewStringUTF(env, "new Java String"); C++: jstring string = env->NewStringUTF("new Java String"); Main difference with compiling JNI code in C and in C++ is the nature of env as you can see it here. Remember that otherwise, the API is the same.
  • 37. Getting a C/C++ string from Java string const char *nativeString = (*env)>GetStringUTFChars(javaString, null); … (*env)->ReleaseStringUTFChars(env, javaString, nativeString); //more secure and efficient: int tmpjstrlen = env->GetStringUTFLength(tmpjstr); char* fname = new char[tmpjstrlen + 1]; env->GetStringUTFRegion(tmpjstr, 0, tmpjstrlen, fname); fname[tmpjstrlen] = 0; … delete fname;
  • 38. Handling Java exceptions // call to java methods may throw Java exceptions jthrowable ex = (*env)->ExceptionOccurred(env); if (ex!=NULL) { (*env)->ExceptionClear(env); // deal with exception } (*env)->DeleteLocalRef(env, ex);
  • 39. Calling Java methods On an object instance: jclass clazz = (*env)->GetObjectClass(env, obj); jmethodID mid = (*env)->GetMethodID(env, clazz, "methodName", "(…)…"); if (mid != NULL) (*env)->Call<Type>Method(env, obj, mid, parameters…); Static call: jclass clazz = (*env)->FindClass(env, "java/lang/String"); jmethodID mid = (*env)->GetStaticMethodID(env, clazz, "methodName", "(…)…"); if (mid != NULL) (*env)->CallStatic<Type>Method(env, clazz, mid, parameters…); • (…)…: method signature • parameters: list of parameters expected by the Java method • <Type>: Java method return type
  • 40. Throwing Java exceptions jclass clazz = (*env->FindClass(env, "java/lang/Exception"); if (clazz!=NULL) (*env)->ThrowNew(env, clazz, "Message"); The exception will be thrown only when the JNI call returns to Java, it will not break the current native code execution.
  • 41. Usando GDB 45 INTEL CONFIDENTIAL
  • 42. Debugging with GDB and Eclipse • Native support must be added to your project • Pass NDK_DEBUG=1 to the ndk-build command, from the project properties: NDK_DEBUG flag is supposed to be automatically set for a debug build, but this is not currently the case.
  • 43. Debugging with GDB and Eclipse* • When NDK_DEBUG=1 is specified, a “gdbserver” file is added to your libraries
  • 44. Debugging with GDB and Eclipse* • Debug your project as a native Android* application:
  • 45. Debugging with GDB and Eclipse • From Eclipse “Debug” perspective, you can manipulate breakpoints and debug your project • Your application will run before the debugger is attached, hence breakpoints you set near application launch will be ignored