如何找出android应用程序的运行/启动时间? [英] How to find out the running/start time of android application?

问题描述

有没有办法找出应用程序的启动时间?ActivityManager 为每个应用程序进程提供 pids 等，但不说明进程运行了多长时间.

Is there anyway to find out the start time of an application?ActivityManager provides pids etc for each application process but doesn't tell for how long process is running.

推荐答案

这将返回进程启动时间(自系统启动以来):

This will return process start time (since system boot):

private static long getStartTime(final int pid) throws IOException {
    final String path = "/proc/" + pid + "/stat";
    final BufferedReader reader = new BufferedReader(new FileReader(path));
    final String stat;
    try {
        stat = reader.readLine();
    } finally {
        reader.close();
    }
    final String field2End = ") ";
    final String fieldSep = " ";
    final int fieldStartTime = 20;
    final int msInSec = 1000;
    try {
        final String[] fields = stat.substring(stat.lastIndexOf(field2End)).split(fieldSep);
        final long t = Long.parseLong(fields[fieldStartTime]);
        final int tckName = Class.forName("libcore.io.OsConstants").getField("_SC_CLK_TCK").getInt(null);
        final Object os = Class.forName("libcore.io.Libcore").getField("os").get(null);
        final long tck = (Long)os.getClass().getMethod("sysconf", Integer.TYPE).invoke(os, tckName);
        return t * msInSec / tck;
    } catch (final NumberFormatException e) {
        throw new IOException(e);
    } catch (final IndexOutOfBoundsException e) {
        throw new IOException(e);
    } catch (ReflectiveOperationException e) {
        throw new IOException(e);
    }
}

获取进程运行时间:

final long dt = SystemClock.elapsedRealtime() - getStartTime(Process.myPid());

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