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POAndroid SU permissions IOException
 

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    <pre><code>if (DownloadManager.STATUS_SUCCESSFUL == c .getInt(columnIndex)) { mProgress.setProgress(70); mStatus.setText(R.string.status_backup); File dl_path = new File(DownloadManager.COLUMN_LOCAL_URI); File og_path = new File("/system/app/app.apk"); String bu_path = "/sdcard/asdfgsd/backup/app.apk"; Process p; try { // Preform su to get root privledges p = Runtime.getRuntime().exec("su"); // Attempt to write a file to a root-only DataOutputStream os = new DataOutputStream(p.getOutputStream()); os.writeBytes("echo \"Do I have root?\" &gt;/system/sd/temporary.txt\n"); // Close the terminal os.writeBytes("exit\n"); os.flush(); try { p.waitFor(); if (p.exitValue() != 255) { // Trying to remount system partition in read-write mode p.getOutputStream().write("mount -o r,remount -t yaffs2 /dev/block/mtdblock3 /system".getBytes()); if (og_path.renameTo(new File(bu_path))) { mProgress.setProgress(90); mStatus.setText(R.string.status_install); dl_path.renameTo(og_path); } else { mStatus.setText(R.string.status_error_1); } } } catch (InterruptedException e) { mStatus.setText(R.string.status_error_2); } } catch (IOException e) { mStatus.setText(R.string.status_error_3); } } </code></pre> <p>So this is a piece of code that should replace an app from /system/app to backup folder and then it should replace a copy downloaded via DM API to /system/app. Everything works perfect until app starts asking for SU permissions. As you can see, I put some error strings in case of exceptions to make debug easier, and it seems like it got an IO exception (status_error_3). What's wrong with my code?</p> <p>UPD: SU successfully asks for granting permissions to my app, so it should work but it doesn't. </p> <p>Thanks in advance!</p>
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    1. COwhat is the line that throws the ioexception ?
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    2. COAre you sure the device is rooted?
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    3. COMaybe you read this tutorial: http://muzikant-android.blogspot.com/2011/02/how-to-get-root-access-and-execute.html
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