通过adb shell am start将数据发送回启动活动的脚本 [英] Send data back to the script which started the activity via adb shell am start

问题描述

我想从 adb 安装诊断应用程序，并从bash脚本中从中获取数据。我知道如何从 adb 开始活动，但是除非找到打印到 logcat 的方法，否则我找不到任何方法来获取数据。 code>并解析输出，但这听起来像是hack。有没有办法从使用 adb 开始的活动中接收数据？

I want to install a diagnostic app from adb and get back data from it from within a bash script. I know how to start an activity from adb, but I can't find any way to get data back unless maybe if I print to logcat and parse the output, but that sounds like a hack. Is there a way to receive data back from an activity started using adb?

推荐答案

如果可以将要发送回自动化脚本的数据序列化为长度小于4k的字符串-使用 logcat 是自然的选择。
只需执行以下操作即可使用 Log.i（ UNIQUE_TAG，the_data_string_you_want_to_send_back_to_your_script）; 将数据打印到日志中，然后在自动化脚本中使用以下命令捕获输出：

If the data that you want to send back to your automation script could be serialized into a string less than 4k long - using logcat is a natural choice. Just make your activity to print the data to the log with Log.i("UNIQUE_TAG", the_data_string_you_want_to_send_back_to_your_script); and then use the following commands in your automation script to capture the output:

# clear the logcat buffer
adb logcat -c

# start your activity
adb shell am start <INTENT>

# this line will block until a string with "UNIQUE_TAG" tag and "Info" priority
# is printed to the main log
adb shell 'logcat -b main -v raw -s UNIQUE_TAG:I | (read -n 1 && kill -2 $((BASHPID-1)))'

# now you can capture the data and process it
DATA=$(adb logcat -d -b main -v raw -s UNIQUE_TAG:I)

在较新的Android版本中（7.0 +），其中 logcat 正确支持 -m< count> ， -t< time> ; 和 -T< time> 参数，您可以使用这个简单得多的版本，而不必使用 logcat清除日志-c 首先：

In more recent Android versions (7.0+) where logcat properly supports -m <count>, -t <time> and -T <time> parameters you can use this much simpler version without having to clear the log with logcat -c first:

# instead of clearing the log just get the current timestamp
TS=$(adb shell 'echo $EPOCHREALTIME; log ""')

# start your activity
adb shell am start <INTENT>

# this command will return immediately if the data has been printed already or block if not
DATA=$(adb shell "logcat -b main -T $TS -m 1 -v raw -s UNIQUE_TAG:I")

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