Android dumpsys用法和一些工具

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Android dump的使用1_android 如何dump systemui-CSDN博客

1、列举所有的模块

dumpsys -l

但有时候并不是很清楚自己的模块名称叫啥，可以去一些相关的service类里找dump函数

比如NTP时间同步：

NTP的dumpsys的tag是network_time_update_service

$ dumpsys  network_time_update_service                                                           
PollingIntervalMs: +1d0h0m0s0ms
PollingIntervalShorterMs: +1m0s0ms
TryAgainTimesMax: 3

TryAgainCounter: 0
NTP cache result: null
 

比如下面的NetworkTimeUpdateService.java，的dumpsys的DumpUtils的第二个参数为tag，是

NetworkTimeUpdateService，应该是将它跟词分割，并且加上下划线，然后变成小写就可以

NetworkTimeUpdateService.java

protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
    if (DumpUtils.checkDumpPermission(this.mContext, "NetworkTimeUpdateService", pw)) {
        pw.print("PollingIntervalMs: ");
        TimeUtils.formatDuration(this.mPollingIntervalMs, pw);
        pw.print("\nPollingIntervalShorterMs: ");
        TimeUtils.formatDuration(this.mPollingIntervalShorterMs, pw);
        pw.println("\nTryAgainTimesMax: " + this.mTryAgainTimesMax);
        pw.println("\nTryAgainCounter: " + this.mTryAgainCounter);
        NtpTrustedTime.TimeResult ntpResult = this.mTime.getCachedTimeResult();
        pw.println("NTP cache result: " + ntpResult);
        if (ntpResult != null) {
            pw.println("NTP result age: " + ntpResult.getAgeMillis());
        }

        pw.println();
    }
}

也可以dumpsys全部打印到某个文件里，然后搜索关键词，比如说上面NTP的 "NTP cache result"，会出现下面的打印

DUMP OF SERVICE network_time_update_service:
PollingIntervalMs: +1d0h0m0s0ms
PollingIntervalShorterMs: +1m0s0ms
TryAgainTimesMax: 3

TryAgainCounter: 0
NTP cache result: null

--------- 0.001s was the duration of dumpsys network_time_update_service, ending at: 2024-06-18 09:50:54