android获取app父进程ID

在android.os.Process中可以直接获取当前应用的进程号：

int pid = android.os.Process.myPid();

在Process中是有获取父进程ID方法的，但是不能用：



通过反射来实现：

//获取对应的类
Class<Process> processClass = android.os.Process.class;
//创建一个对象
Process process = null;
try {
process = processClass.newInstance();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
int ppid = 0;
try {
//创建方法process中myPpid方法
Method method = processClass.getMethod("myPpid");
//调用方法，传入对象
ppid = (int) method.invoke(process);
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}

主要看看invoke方法：

* @param receiver
*            the object on which to call this method (or null for static methods)
* @param args
*            the arguments to the method
* @return the result
*
* @throws NullPointerException
*             if {@code receiver == null} for a non-static method
* @throws IllegalAccessException
*             if this method is not accessible (see {@link AccessibleObject})
* @throws IllegalArgumentException
*             if the number of arguments doesn't match the number of parameters, the receiver
*             is incompatible with the declaring class, or an argument could not be unboxed
*             or converted by a widening conversion to the corresponding parameter type
* @throws InvocationTargetException
*             if an exception was thrown by the invoked method
*/
public native Object invoke(Object receiver, Object... args)
throws IllegalAccessException, IllegalArgumentException, InvocationTargetException;

第一个参数receiver是调用该方法的对象，就是之前创建的process对象，第二个参数是对应方法的参数，由于myPpid()没有参数就不用传了。

关于反射更详细的介绍看：

http://blog.csdn.net/liujiahan629629/article/details/18013523