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< br /> d: \ BACKUP \ workspace \ helloworld \ bin> javah com.simon.HelloworldActivity
error : Can not access android.app.Activity
find android.app . Activity class file
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Why not NDK?
http://mindtherobot.com/blog/452/android-beginners-ndk-setup-step-by-step/
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what you are JNI ah. how also find android.app.Activity go. .
The class specifically created a jni try
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javah-d
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this problem should be your path to the path that you must question it wrong ; directly to you that you compiled . class in the same directory with the project is with the home directory at the same level it should be all right
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recommend using the following two commands:
d: \ BACKUP \ workspace \ helloworld \ bin \ com \ simon> javac HelloworldActivity.java
d: \ BACKUP \ workspace \ helloworld \ bin \ com \ simon> javah-jni HelloworldActivity
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javah-jni co.aaf.class
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javah-jni com.example.HelloWorld
com.example Yes, you package
If the path is : / home / user / com / example / HelloWorld.class
then the / home / user execute javah
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NDK I have installed , but javah command looks like , and it has nothing to do NDK ?
is a simple empty Android project ah :
package com.simon;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
public class HelloworldActivity extends Activity {
private static final String TAG = "HelloWorld";
static {
System.loadLibrary("helloworld");
}
private native String printJNI();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.d(TAG, "Activity call JNI: " + printJNI());
}
}
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I have encountered this problem I do not know what to solve
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and android is not the main connection inside the class , I tested , I was using the 2.2 version, and then went sdk inside xxx-8 directory, copy the android.jar , renamed android.rar, and then extract the files into a folder named android , delete android.rar, go android folder, directory replication , to the classpath which together go , ok the
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added which classpath? System variable or the java application in eclipse ? Are added , or not
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online that are scattered, after a day of inquiries and countless failures and found something like this .
1. , such as 10 F, said : According to the android system is different in different versions generate an android folder.
2. system variable is set :
(1) My Computer - Properties - Advanced - Environment Variables
increase system variables : java_home: D: \ Program Files \ Java \ jdk1.7.0_01 (java installed after the path ) ,
Path variable, add % java_home% / bin,
increase system variables : classpath:.; D: \ Program Files \ Android \ android-sdk \ platforms \ android-8 \ android ( first 1:00 android folder path , with particular attention to add . " ; "Otherwise it will fail to )
3. in eclipse build project , of course, the best error-free . In the cmd window enter engineering classes directory run : javah-jni package name. Class name
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with the path on the implementation of
cd
execute javah-jni com.example.HelloWorld
thanked. . . .
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Why android-8 do ?
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Why platforms \ android-8 instead of platforms \ android-7 or platforms \ android-9? Thank you advice
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ultimately did not get the solution hope that we can give a definite answer .
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if built android no contact classes and a java class no separate question , how long the class will not work with android have addressed ?
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because of my own projects is 2.2 . The projects are generally 2.2 or 2.3 according to their own choice going to get .
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ANDROID system directly into the source code compiler environment is very simple .
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javah-jni com.example.HelloWorld
com.example Yes, you package
If the path is : / home / user / com / example / HelloWorld.class
then the / home / user execute javah
Positive Solutions
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D: \ workspace \ DiskNumber \ src \ com \ tjn \ test first
cd D: \ workspace \ DiskNumber \ src \ com \ tjn \ test and then run javac TestDll.java generate class files,
need to generate header files, enter
set classpath = D: \ workspace \ DiskNumber \ src , to the project's src root directory, then run
javah-jni com.tjn.test.TestDll
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21 House said setting set classpath = D: \ workspace \ DiskNumber \ src the class path settings can be very helpful , thank you.
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finally found the answer. Thank you. . .
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