jni example

that sometimes there will be that, java.lang.UnsatisfiedLinkError:No implementation found for xxxxxxxxxxxxx ....Simply collapsed, and later found a lot of information.Workaround, add a static code block to the activity that uses the so file static{System.loadlibrary ("So file name"); For example: So file is libabc.so so when it's used, it's ABC.}Got a few days finally solved, hope to meet the same problem of people can refer to.This article is from t

Files under the Assets Directory will be packaged into an APK file. These resources are not extracted during installation and are directly read from the APK during use. This section describes how to use the interface functions provided by ndk in JNI to read assets resource files and libzip library functions, which can be used to read creation, modification, and compression documents, here, we also take the resource file in the APK installation package

Android JNI local reference table overflow: local reference table overflow (max = 512), androidjni Reprinted please indicate the source: http://blog.csdn.net/xyang81/article/details/44873769 In JNI/NDK Development Guide (10) -- JNI local reference, global reference, and weak global reference, this article details how to use three references in

The previous article is a simple application that shows how JNI works, and this article is mainly about the description of the parameters of the local method SayHello, and the use of the methodsFirst, consider the implementation of the SayHello method in C + +:[CPP]View Plaincopy Jniexport void Jnicall Java_com_jni_demo_jnidemo_sayhello (jnienv * env, jobject obj) { cout"Hello World" } For the explanation of the jnienv* env

not need to implement specifically. As follows: Public native static void set (int i); public native static int get (); Then you compile the Java program file, generate class, and then use the Javah command, and JNI will generate the header file for C + +. For example, program Testdll.java, the content is: public class testdll { static { System.loadLibrary("goodluck"); } public native static int get()

Transferred from: http://blog.csdn.net/jiangwei0910410003/article/details/17465457The previous article is a simple application that shows how JNI works, and this article is mainly about the description of the parameters of the local method SayHello, and the use of the methodsFirst, consider the implementation of the SayHello method in C + +:[CPP]View PlainCopy Jniexport void Jnicall Java_com_jni_demo_jnidemo_sayhello (jnienv * env, jobject ob

Android Call so The Android virtual machine cannot call the underlying device directly, and we need to use so if we want to call the underlying device. So use C language or C + + writing complete, using NDK to compile, run directly in the Linux kernel. By JNI call So when the basic type can be directly interactive, jstring use a bit cumbersome, so I do a jstring and char* to convert the example. First ste

From C + + to Java, and then back to C + + from Java, today finally have the opportunity to understand the connection between Java, C + + bridge--jni. Ha ha! Share it! First, IntroductionJNI is a shorthand for Java Native Interface, which can be translated into Java native interfaces. Java can invoke C + + libraries through JNI, which is a good way for those Java programs that have higher performance requi

Android Studio 1.5.1 JNI Programming 1. Create a project MyJNI and use the default settings.2. Create a Test class: Right-click com. example. myjni to create a java class.3. Write the following code in the Test class. The "test" library in loadLibrary ("test") is the name of the NDK library, which will be defined later. MyFun () is our custom c ++ function. public class Test { static { System.loa

(To) http://blog.csdn.net/fontlose/article/details/6686161 Files under the Assets Directory will be packaged into an APK file. These resources are not extracted during installation and are directly read from the APK during use. This section describes how to use the interface functions provided by ndk in JNI to read assets resource files and libzip library functions, which can be used to read creation, modification, and compression documents, here, we

1. Reference documents:http://blog.csdn.net/youjianbo_han_87/article/details/2586375http://blog.csdn.net/yangjiali014/article/details/1633017http://blog.chinaunix.net/space.php?uid=7437948do=blogid=2054823http://www.iteye.com/topic/72543Http://www.enet.com.cn/article/2007/1029/A20071029886398.shtmlhttp://blog.csdn.net/heqingrong623/article/details/3906350Reference 1: Invoke C or C + + dynamic Join library with JNI so simpleSummary of technical practic

32Double Jdouble 64void void N/A------------------------------------------------------------------------2.java passing object types to CFor Java to pass in the Java object model, c to load the Java class prototype, based on the creation of the corresponding C object, get the ID of the Java object method, and then call the Java object method. For example, there is a Java class customer object passed to the C program as a

1. Simple data type examplesSuppose we have an open static method in Java that has no parameters and has an int return value. How do I call it in C + +?Package CB. Cbccble;public class Cbccblecentralmanager {public static final String TAG = "Cbccblecentralmanager Android"; public static int open () { log.d (TAG, "open"); return 1;} }here is the following specific call method, the difficulty is mainly the Getstaticmethodinfo method of the incoming parameters. Notice that the Cb/

Transferred from: http://blog.csdn.net/xw13106209/article/details/69894151. Reference documents:http://blog.csdn.net/youjianbo_han_87/article/details/2586375http://blog.csdn.net/yangjiali014/article/details/1633017http://blog.chinaunix.net/space.php?uid=7437948do=blogid=2054823http://www.iteye.com/topic/72543Http://www.enet.com.cn/article/2007/1029/A20071029886398.shtmlhttp://blog.csdn.net/heqingrong623/article/details/3906350Reference 1: Invoke C or C + + dynamic Join library with

Android Studio JNI Development Project, androidjni After creating a new project using Android sudio, record the basic steps for creating the NDK project. This article will reach: 1. Create an NDK project 2. Output a Log statement in JNI 3. Specify the abi version of The so library to be compiled 4. Solve the Problem in creating an NDK Project Step: 1. Add the native Interface and write the native Interface

course printing out the value "Yangxin" of the str attribute. So when we call the JNI function in the local code to access a property in the Java object, the first step is to get the class reference to the object, then find the field ID that needs to be accessed in class, and finally call the Getxxxfield series function of the JNI function. Gets the value of the field (property). In the

a common parent type jobject (equivalent to the same as the object class in Java is the parent class of all classes ). Below are some subclasses of jobject implemented by JNI: Figure 1: subclass of jobject 4. Access the content in the Java program in the local method 1) access the string object: The string object passed in from the Java program corresponds to the jstring type in the local method. The jstring type is different from the char * type i

JNI in order to play a match between C + + and Java, the first thing it needs to do is to know both the data types in Java and the data types in C/s + +. At this point, JNI is the equivalent of an adapter. Like, A and C two people did not know, but now B know a, A and C, then through the C Guide and introduction, A and C know!1. Matching of raw data types:The local types in

Compile the JNI method for the hardware abstraction layer (HAL) module of Android in Ubuntu to provide the Java access hardware service interface (Lao Luo study note 4), androidjni In the last two articles, we introduced how to write drivers for Android hardware, including how to implement kernel drivers in Linux kernel space and Hardware Abstraction Layer interfaces in user space. The purpose of both is to provide a hardware access interface to the p

This article was reproduced in: http://blog.csdn.net/qinjuningThere are two types of data in Java: Basic types and reference types, which everyone knows.Similar data types exist in the JNI world, which, compared to Java, is more rigorous in scope, as follows:1, primitive types----basic data types, such as: int, float, char and other basic types2, reference types----reference type, such as: Class, instance, array.It is important to note that the array