jni example

Original article: Android calls the JNI process to facilitate subsequent operations. I personally recorded the entire process of calling JNI, and I forgot to save it. Ah. In some cases, the ndk environment and ndk source code must be prepared. cygwin must be installed with a profile. Java requires environment variables. 1. Create a new project and create a class to declare the method that calls native.

Welcome to reprint, be sure to indicate the source. http://blog.csdn.net/wang_shuai_ww/article/details/44456755This is the second method of adding JNI and services following the application layer development process record of the s5p4418 Android 4.4.2 Drive Layer HAL Layer service layer.The previous approach was to add HAL and the service layer directly. Android in the API. The advantage of this approach is that the operating system has been developed

Welcome reprint, but must indicate the source. http://blog.csdn.net/wang_shuai_ww/article/details/44456755This article is another way to add jni and services after the s5p4418 Android 4.4.2 Driver Layer Application layer development process record for the HAL Layer service layer.The previous approach is to add HAL and the service layer directly to the Android API, this way the benefits of the operating system has been developed, leaving the developmen

In JNI, when we use getfieldid/getstaticfieldid or getmethodid/getstaticmethodid and define jninativemethod, We need to indicate the type of the member variable, or the type of the input parameter or returned by the function. JNI abbreviated the field type, or the type of input parameter or return value of the function as char. For member variables, you can simply use the abbreviation of Java type to ind

1 Application Layer CodeNdkparam.java is the invocation class for the JNI function, and its code is as follows:PackageCOM.SKYWANG.NDK;Importandroid.app.Activity;ImportAndroid.os.Bundle;ImportAndroid.util.Log;PublicClass NdkparamExtendsActivity {PublicStaticFinal String tag= "Skywang--ndkparam";/**Called when the activity is first created.*/Private person person=Null; @OverridePublicvoidOnCreate (Bundle savedinstancestate) {Super. OnCreate (Savedinstan

Two consecutive errors:JNI error (App bug): Accessed stale reference 0xd0100019 (index 6 in a table of size 1) One, Jclass direct assignment causes the problem. Reason: cannot refer directly to JclassSolution: Static Jclass MyClass; Jclass cls = Env->findclass ("Com/xxx/class"); MyClass = (jclass) env->newglobalref (CLS); Second, in a C + + method, the direct reference is not to Jobject, through the static Jobject MyObject, to the object set jobject all kinds of anomalies occur. The call to the

The calling API allows software providers to load Java VMS into arbitrary local applications. Vendors can provide Java-enabled applications without the need to link Java VM code. Overview The following code shows how to use a function by invoking the API. In this example, C + + code creates a Java VM and invokes a static method, which is main.test. For code simplicity, error checking is omitted. #include This

Hotspot mainly has two kinds of interpreters. The Template Intepreter is also called the asm interprete interpreter. The introduction below is basically based on the template interpreter. We will give an example of invokespecial, the following code explains invokespecial using the templateTable method [cpp] void TemplateTable: invokespecial (int byte_no) {transition (vtos, vtos); assert (byte_no = f1_byte, "use this argument"); prepare_invoke (rbx, no

[Java JNI quick learning tutorial] and Java JNI quick learning 1. Introduction to JNI JNI is the abbreviation of Java Native Interface, which is a Java Local Interface. Problem Source: because it is difficult to compile underlying applications in Java, it is difficult to be competent in some Java programs with high re

1.JNI IntroductionJNI is all called Java Native Interface;Starting with Java1.1, JNI becomes part of the Java platform, allowing Java code to interact with code written in other languages, such as cc++;The concept of JNI was not introduced from Android.2. What is the NDK?The NDK is all called the native Development Kit native language (cc++) development kit;The N

add (jnienv * ENV, jobject thiz, jint A, jint B) {}// define the Java method add Static const char * classpathname = "com/example/Android/simplejni/native"; // target Java class path Static jninativemethod methods [] = {// list of local implementation methods{"Add", "(ii) I", (void *) add },}; Static int registernativemethods (jnienv * ENV, const char * classname,Jninativemethod * gmethods, int nummethods) {}// register a local

Tag: SSO message returns String class Exce ack Roc placeIn Java programming, we often encounter a variety of exceptions, and also handle various exceptions. Handling exceptions is very simple in Java, we usually use try-catch-finally to handle them, or we can simply throw an exception with throw. So how do we deal with exceptions when it comes to JNI programming?Exception handling ProcessThe JNI specificati

[Android ndk jni] android-ndk-r9d + adt-bundle-windows environment construction-Hello-jni case study, androidndkr9d Refer to the blog: http://blog.csdn.net/leilu2008/article/details/12495273 My android ndk version is: android-ndk-r9d-windows-x86_64.zip. Reminder: do not save the package to a directory containing spaces after decompression. Otherwise, the compiler reports an error when compiling c and c ++

First JNI exploration, small experiment, and first jni Exploration First jni test :( Documentation: http://download.csdn.net/detail/u010476739/8065987) Test environment, vs2010 flagship edition, win7 flagship 64-bit MyEclipse2014 1. Compile a java class: Public classNativeClass { Public native voidShow (); Public static voidMain (String [] args ){ System.LoadLibr

This year Google launched Android 6.0, as an Android developer, it is certainly essential to learn to master, today's small series and we share is the knowledge of the JNI in Android 6.0, which is in an Android tutorial online to see the content, feel very good, Take a look at it ~ ~Beginners may ask first, what is Jni a ghost?In fact, the full name of the JNI Ja

JNI returns one of the complex objects. jni returnsRequirements: First of all, I need to take over a project recently. I want to parse binary data at the underlying layer. The data structure is quite responsible. Because the server is a c ++ server, and I didn't take mobile development into account at the beginning, so the protocol is a bit bullshit! In general, a data packet contains a vector in the map an

configure the requirementsClick on the program again point in the upper left corner of the new, you can see my program under the JAVAH/NDK this is I have been configured, the following continue to teach you to configureQuick build operation configuration with no command lineArguments:-classpath ${project_loc}\bin\classes-d ${project_loc}\jni-jni ${java_type_name}After configuring the CommonEvery time you c

1. JNI OverviewJNI is the abbreviation of Java Native Interface. It is translated into "Java local call" in Chinese, and JNI is a local programming Interface. It enables the Java code running inside the Java Virtual Machine (VM) to interoperate with applications and libraries written in other programming languages (such as C, C ++, and assembly languages. That is to say,

Jni_onload () function is not provided, the VM defaults to the oldest version of JNI 1.1), and if you want to use the new release of JNI,For example, JNI version 1.4, the Jni_onload () function must return a constant jni_version_1_4 (which is defined in jni.h) to inform the VM.Initialization setting, when the VM execu

in the/system/lib directory of the target system. In addition, Android also contains other JNI libraries. For example, the JNI directory of the Media Section, frameworks/base/Media/JNI/, is compiled into the library libmedia_jni.so. Each file in JNI is actually a common fil