Re: [android-developers] IPC Mechanism in android
You can just read the native program's standard output. Take a look at Java Process class. 29.03.2011 6:20 пользователь arvind arv2...@gmail.com написал: Hi All, I have an NDK application(written in C++) packaged as an executable and deployed in android. I also have a Java apk file in the application layer. Now my NDK app does some processing and outputs a string of data in the format name = value. Basically the output from NDK looks like this: name1 = value1 name2 = value2... Now i want each of these name value pairs to be passed to java application one by one. Currently i am writing the output from NDK to a file in sdcard and the java app reads from the file. But i want to use an IPC mechanism which is devoid of explicit file writing and reading and instead use something like sending and listening to a socket. I am not sure what is the best way of passing message between native code and java. Also i am not using JNI interface as i have some issue with root permissions as the C++ Native code runs as root userid and Java apk runs in application level and i can't combine both of them. Please give me suggestions on how to perform IPC between native code and java apk. I am using android developer phone 1 as the device. Thanks, aravind -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] IPC Mechanism in android
That works if you start the native program from the Java program. It doesn't work if it needs to run independently. I like Frank's approach. Generally, minimizing the amount of C++ code in an application will make things better. In fact, I would argue you never want to make a native C++ application, but rather write what you must in C++, expose it in small pieces via JNI, and package it as a Java application. In some cases, the C++ part might be the major piece, but you'll be better off with that thin bit of Java around your C++. Even if you don't see a need today, at some point in the future, there may some bit of functionality easily provided via Java, that you'll be happy to make use of. On Tuesday, March 29, 2011 12:48:44 AM UTC-7, Kostya Vasilyev wrote: You can just read the native program's standard output. Take a look at Java Process class. 29.03.2011 6:20 пользователь arvind arv...@gmail.com написал: Hi All, I have an NDK application(written in C++) packaged as an executable and deployed in android. I also have a Java apk file in the application layer. Now my NDK app does some processing and outputs a string of data in the format name = value. Basically the output from NDK looks like this: name1 = value1 name2 = value2... Now i want each of these name value pairs to be passed to java application one by one. Currently i am writing the output from NDK to a file in sdcard and the java app reads from the file. But i want to use an IPC mechanism which is devoid of explicit file writing and reading and instead use something like sending and listening to a socket. I am not sure what is the best way of passing message between native code and java. Also i am not using JNI interface as i have some issue with root permissions as the C++ Native code runs as root userid and Java apk runs in application level and i can't combine both of them. Please give me suggestions on how to perform IPC between native code and java apk. I am using android developer phone 1 as the device. Thanks, aravind -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-d...@googlegroups.com To unsubscribe from this group, send email to android-develop...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] IPC Mechanism in android
Good lord, please don't run a big piece of C++ code as root. We designed things to have very very little code running as root, to keep the exploit surface area small. Also we strongly strongly discourage people from writing their apps with such a structure, where they for a separate process. The system is not designed to be used this way, and it won't manage these separate processes correctly. Currently it doesn't do much with them, but probably in the future it will get more aggressive about killing and cleaning them out of the system. On Sat, Mar 26, 2011 at 5:43 PM, arvind arv2...@gmail.com wrote: Hi All, I have an NDK application(written in C++) packaged as an executable and deployed in android. I also have a Java apk file in the application layer. Now my NDK app does some processing and outputs a string of data in the format name = value. Basically the output from NDK looks like this: name1 = value1 name2 = value2... Now i want each of these name value pairs to be passed to java application one by one. Currently i am writing the output from NDK to a file in sdcard and the java app reads from the file. But i want to use an IPC mechanism which is devoid of explicit file writing and reading and instead use something like sending and listening to a socket. I am not sure what is the best way of passing message between native code and java. Also i am not using JNI interface as i have some issue with root permissions as the C++ Native code runs as root userid and Java apk runs in application level and i can't combine both of them. Please give me suggestions on how to perform IPC between native code and java apk. I am using android developer phone 1 as the device. Thanks, aravind -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] IPC Mechanism in android
Hi All, I have an NDK application(written in C++) packaged as an executable and deployed in android. I also have a Java apk file in the application layer. Now my NDK app does some processing and outputs a string of data in the format name = value. Basically the output from NDK looks like this: name1 = value1 name2 = value2... Now i want each of these name value pairs to be passed to java application one by one. Currently i am writing the output from NDK to a file in sdcard and the java app reads from the file. But i want to use an IPC mechanism which is devoid of explicit file writing and reading and instead use something like sending and listening to a socket. I am not sure what is the best way of passing message between native code and java. Also i am not using JNI interface as i have some issue with root permissions as the C++ Native code runs as root userid and Java apk runs in application level and i can't combine both of them. Please give me suggestions on how to perform IPC between native code and java apk. I am using android developer phone 1 as the device. Thanks, aravind -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
