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Can't run the "su" program on the root device

I have an embedded Android N phone (AOSP build). I am trying to root my application but it keeps getting denied permission. Here's what I'm trying:

java.lang.Process p = runtime.exec("su");
                DataOutputStream commandLine = new DataOutputStream(p.getOutputStream());
                commandLine.writeBytes("rm /data/local/tmp/testfile\n");
                commandLine.flush();
                p.waitFor();

However, it keeps failing with the error:

W/System.err: java.io.IOException: Cannot run program "su": error=13, Permission denied
W/System.err:     at java.lang.ProcessBuilder.start(ProcessBuilder.java:983)
W/System.err:     at java.lang.Runtime.exec(Runtime.java:691)
W/System.err:     at java.lang.Runtime.exec(Runtime.java:524)
W/System.err:     at java.lang.Runtime.exec(Runtime.java:421)
W/System.err:     at MainActivity$2.onClick(MainActivity.java:104)

I also added android.permission.ACCESS_SUPERUSER

to my manifest, but that doesn't seem to make any difference.

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1 answer


You can start su process like this:



ProcessBuilder mProcess = new ProcessBuilder()
                                   .command("/system/xbin/su")
                                   .redirectErrorStream(true).start();

OutputStream out = mProcess.getOutputStream();
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