如何在 Java 中编写 adb shell 命令

Question

I wanted to pull some.db file from android device for automation testing which needs to

1. Open Command prompt 2.enter the adb shell commands, below are the commands that i wanted to write in command prompt by programaticaly in JAVA,

adb shell
run-as com.sk.shaft
cd files
cp file.db /sdcard/download/sample.db3
exit                               
exit                              
adb pull /sdcard/download/sample.db3 C:/users/libin/desktop/sample.db

Till now i can open command prompt but i cant enter the above commands in the command prompt.

public class DBExtract {

    public static void main(String[] args) throws IOException {

Process process= Runtime.getRuntime().exec("cmd /c start cmd.exe /k ");
}
}

could anyone suggest please?

Answer 1

Run multiple commands. When opening a cmd window you lose control over it. You could create a batch script, run it in a new cmd window and redirect the input.

You can pass the batch script after the /k parameter of cmd.exe . In the batch file, you can use the redirection from batch.

You are actually running two commands. adb shell is one command and adb pull is another. To execute "subcommands" in the shell from adb, use process.getOutputStream() , create an OutputStreamWriter on it and write the commands to it.

So, create a process for adb shell, redirect text to the input of the program and then use adb pull in another process.

If you want to see the output of the commands, use Process#getInputStream .

The program could look like this:

public class DBExtract {

    public static void main(String[] args) throws IOException {
        Process process= Runtime.getRuntime().exec("adb shell");
        try(PrintWriter pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(process,getOutputStream(),StandardCharsets.UTF_8)))){
            pw.println("run-as com.sk.shaft");
            pw.println("cd files");
            pw.println("cp file.db /sdcard/download/sample.db3");
            pw.println("exit");
            pw.println("exit");
        }
        process=Runtime.getRuntime().exec("adb pull /sdcard/download/sample.db3 C:/users/libin/desktop/sample.db");
    }
}