How to Run Shell Commands with Elevated Privileges in Android Applications?

Executing Shell Commands from Android Applications

When attempting to execute shell commands from within Android applications, it is essential to consider the limitations imposed by the operating system. To gain elevated privileges, it is recommended to use the "su" utility, which provides a more secure mechanism for granting temporary root access.

In a standard Android terminal, executing commands with "su" is achieved by typing "su" followed by the desired command, such as "screenrecord --time-limit 10 /sdcard/MyVideo.mp4". However, when attempting to perform this same action from within a Java application, there may be difficulties.

One potential issue возникает when attempting to execute "su" and the command simultaneously. To properly elevate privileges, it is necessary to first launch the "su" process and subsequently provide the command as input through the standard input stream.

To achieve this, a modified version of the code is as follows:

try {
    Process su = Runtime.getRuntime().exec("su");
    DataOutputStream outputStream = new DataOutputStream(su.getOutputStream());

    // Provide the command through the standard input stream
    outputStream.writeBytes("screenrecord --time-limit 10 /sdcard/MyVideo.mp4\n");
    outputStream.flush();

    // Terminate the "su" process
    outputStream.writeBytes("exit\n");
    outputStream.flush();
    su.waitFor();
} catch (IOException | InterruptedException e) {
    throw new Exception(e);
}

By modifying the code in this manner, it is possible to successfully execute shell commands from Android applications using the "su" utility, thereby gaining elevated privileges as required for tasks such as screen recording.

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