Where to Find Info on Android's "Service Call" Shell Command

How to know whether service is running using adb shell in android

Try the command line

adb shell service list

I get a list of service names and their package names as well.

How do I listen for a response from shell command in android studio?

UPDATE : Solution is in Unable using Runtime.exec() to execute shell command "echo" in Android Java code :

Runtime.getRuntime.exec() doesn't execute a shell command directly,
it executes an executable with arguments. "echo" is a builtin shell
command. It is actually a part of the argument of the executable sh
with the option -c. Commands like ls are actual executables. You can
use type echo and type ls command in adb shell to see the
difference.

So final code is:

String[] cmdline = { "sh", "-c", "echo $..." }; 
Runtime.getRuntime().exec(cmdline);

cat is also executable from within Runtime.exec() without invoking sh

This is also analyzed in https://www.javaworld.com/article/2071275/when-runtime-exec---won-t.html?page=2 in paragraph Assuming a command is an executable program

The code in Execute shell commands and get output in a TextView is good although it uses a command that is executable directly (ls, see update above) :

try {
        // Executes the command.
        Process process = Runtime.getRuntime().exec("ls -l");

        // Reads stdout.
        // NOTE: You can write to stdin of the command using
        //       process.getOutputStream().
        BufferedReader reader = new BufferedReader(
                new InputStreamReader(process.getInputStream()));

        int read;
        char[] buffer = new char[4096];
        StringBuffer output = new StringBuffer();
        while ((read = reader.read(buffer)) > 0) {
            output.append(buffer, 0, read);
        }
        reader.close();

        // Waits for the command to finish.
        process.waitFor();

        return output.toString();
    } catch (IOException e) {
        throw new RuntimeException(e);
    } catch (InterruptedException e) {
        throw new RuntimeException(e);
    }

Execute shell commands and get output in a TextView

You can run command and display command output into text as below :

public class MainActivity extends Activity {

    TextView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv=(TextView)findViewById(R.id.cmdOp);
        tv.setText("Output :"+"\n"+runAsRoot());
    }

    public String runAsRoot() {

        try {
            // Executes the command.
            Process process = Runtime.getRuntime().exec("ls -l");

            // Reads stdout.
            // NOTE: You can write to stdin of the command using
            //       process.getOutputStream().
            BufferedReader reader = new BufferedReader(
                    new InputStreamReader(process.getInputStream()));

            int read;
            char[] buffer = new char[4096];
            StringBuffer output = new StringBuffer();
            while ((read = reader.read(buffer)) > 0) {
                output.append(buffer, 0, read);
            }
            reader.close();

            // Waits for the command to finish.
            process.waitFor();

            return output.toString();
        } catch (IOException e) {
            throw new RuntimeException(e);
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
    }
}

Note : The "su" command does only run if the device is rooted. Otherwise it throws an exception.

Android ADB commands to get the device properties

adb shell getprop ro.build.version.sdk

If you want to see the whole list of parameters just type:

adb shell getprop

---

Related Topics