问题描述
我想从 adb 安装一个诊断应用程序，并从 bash 脚本中取回数据.我知道如何从 adb 开始一个活动，但我找不到任何方法来取回数据，除非我打印到 logcat 并解析输出，但是听起来像一个黑客.有没有办法从使用 adb 开始的活动接收数据?
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
如果您要发送回自动化脚本的数据可以序列化为长度小于 4k 的字符串 - 使用 logcat是很自然的选择.只需让您的活动使用 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来捕获输出:
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 logcat 正确支持 -m 、-t 的最新 Android 版本 (7.0+) 中和 -T 参数，您可以使用这个更简单的版本，而无需先使用 logcat -c 清除日志:
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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