java/jdk版本不对导致android编译错误

1.问题描述:

以前编译android4.4的时候没啥问题,自从安装了eclipse后就编译不过,错误信息如下:

GenerateJNIHeader
    jni_from_javap = JNIFromJavaP.CreateFromClass(input_file, options)
  File "../../base/android/jni_generator/jni_generator.py", line 522, in CreateFromClass
    jni_from_javap = JNIFromJavaP(stdout.split('\n'), options)
  File "../../base/android/jni_generator/jni_generator.py", line 488, in __init__
    signature=JniParams.ParseJavaPSignature(contents[lineno + 1]))]
  File "../../base/android/jni_generator/jni_generator.py", line 147, in ParseJavaPSignature
    return '"%s"' % signature_line[signature_line.index(prefix) + len(prefix):]
ValueError: substring not found
make: *** [out/target/product/smdk4x12/obj/GYP/shared_intermediates/ui/gl/jni/Surface_jni.h] Error 1
make: *** Waiting for unfinished jobs....
make: *** [out/target/product/smdk4x12/obj/GYP/shared_intermediates/android_webview/jni/InputStream_jni.h] Error 1
Traceback (most recent call last):
  File "../../base/android/jni_generator/jni_generator.py", line 1103, in 
    sys.exit(main(sys.argv))
  File "../../base/android/jni_generator/jni_generator.py", line 1099, in main
    GenerateJNIHeader(input_file, output_file, options)
  File "../../base/android/jni_generator/jni_generator.py", line 1012, in GenerateJNIHeader
    jni_from_javap = JNIFromJavaP.CreateFromClass(input_file, options)
  File "../../base/android/jni_generator/jni_generator.py", line 522, in CreateFromClass
    jni_from_javap = JNIFromJavaP(stdout.split('\n'), options)
  File "../../base/android/jni_generator/jni_generator.py", line 488, in __init__
    signature=JniParams.ParseJavaPSignature(contents[lineno + 1]))]
  File "../../base/android/jni_generator/jni_generator.py", line 147, in ParseJavaPSignature
    return '"%s"' % signature_line[signature_line.index(prefix) + len(prefix):]
ValueError: substring not found
make: *** [out/target/product/smdk4x12/obj/GYP/shared_intermediates/android_webview/jni/CancellationSignal_jni.h] Error 1

2.原因分析:

导致上述的错误应该是我在用eclipse的时候需要用jdk 7,而android4.4源码编译需要用jdk 6,所以才会出现莫名其妙的错误.

3.解决方法:

用一个命令就可以切换jdk版本,这个命令是：

sudo update-alternatives --config javap

如果只有一个jdk版本则需要添加javap

sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/jdk1.6.0_45/bin/javap 300

否则就需要选择jdk版本

root@ubuntu:/home/topeet/Android/iTop4412_KK4.4_git# sudo update-alternatives --config javap
There are 2 choices for the alternative javap (providing /usr/bin/javap).

  Selection    Path                                Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/jdk1.8.0_74/bin/javap   300       auto mode
  1            /usr/lib/jvm/jdk1.6.0_43/bin/javap   1         manual mode
  2            /usr/lib/jvm/jdk1.8.0_74/bin/javap   300       manual mode

Press enter to keep the current choice[*], or type selection number: 1
update-alternatives: using /usr/lib/jvm/jdk1.6.0_43/bin/javap to provide /usr/bin/javap (javap) in manual mode.
root@ubuntu:/home/topeet/Android/iTop4412_KK4.4_git# 
root@ubuntu:/home/topeet/Android/iTop4412_KK4.4_git# 
root@ubuntu:/home/topeet/Android/iTop4412_KK4.4_git# 
root@ubuntu:/home/topeet/Android/iTop4412_KK4.4_git# sudo update-alternatives --config javap
There are 2 choices for the alternative javap (providing /usr/bin/javap).

  Selection    Path                                Priority   Status
------------------------------------------------------------
  0            /usr/lib/jvm/jdk1.8.0_74/bin/javap   300       auto mode
* 1            /usr/lib/jvm/jdk1.6.0_43/bin/javap   1         manual mode
  2            /usr/lib/jvm/jdk1.8.0_74/bin/javap   300       manual mode

Press enter to keep the current choice[*], or type selection number:

最后java -version的版本是改过来了，但是javac -version的版本没有改过来

root@maya-g450:/opt/FriendlyARM/android-4.2.2_r1# make -j4
============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=4.2.2
TARGET_PRODUCT=full_tiny4412
TARGET_BUILD_VARIANT=eng
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
TARGET_ARCH_VARIANT=armv7-a-neon
HOST_ARCH=x86
HOST_OS=linux
HOST_OS_EXTRA=Linux-3.16.0-77-generic-x86_64-with-Ubuntu-14.04-trusty
HOST_BUILD_TYPE=release
BUILD_ID=JDQ39
OUT_DIR=out
============================================
Checking build tools versions...
************************************************************
You are attempting to build with the incorrect version
of javac.
 
Your version is: javac 1.8.0_74.
The correct version is: 1.6.
 
Please follow the machine setup instructions at
    https://source.android.com/source/download.html
************************************************************

再次修改另一个文件：bashrc文件，把JAVA_HOME的目录改成java 1.6的就可以解决问题。

export JAVA_HOME=/usr/lib/jvm/jdk1.6.0_43/

参考资料：http://www.linuxdiyf.com/linux/15546.html

http://blog.csdn.net/evahuangchen/article/details/48392539