the result of stream read contains some special character?

[jxgxldl]

there are example code in order to get os version of device as belows: use cmd: getprop ro.build.version.release
AdbStream stream = adb.open("shell:");
stream.write("getprop ro.build.version.release" +'\n');

when stream read
String bufStr = new String(stream.read(), StandardCharsets.UTF_8);
//...

the output of bufStr contains some special character: like ^@, / $...

does any wrong when I use adblib?

[mirfatif]

It's a problem with Android's default shell. It mixes its prompt string with the output of executed command. ^@ is the null character and / $ is the shell prompt we see on an interactive shell.

So either run like adb.open("shell:exec sh -T-") with a hope that the newly forked shell will completely daemonise. Or if you intend to run only a single command, run it directly in the non-interactive way like adb.open("shell:exec getprop ro.build.version.release").