根据包名获取进程pid

<span style="white-space:pre">		</span> ActivityManager am = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
		List<ActivityManager.RunningAppProcessInfo> mRunningProcess = am.getRunningAppProcesses();
		int pid=-1;
		//int i = 1;
		for (ActivityManager.RunningAppProcessInfo amProcess : mRunningProcess){
			if(amProcess.processName.equals(packagename)){
				pid=amProcess.pid;
				break;
			}
			//Log.i("zhuming", (i++) + "PID: " + amProcess.pid + "(processName=" + amProcess.processName + "UID="+amProcess.uid+")");
		}