How to get permission to execute su command from Xamarin Android

Question

I have Xamarin PCL and in Android project I would like to take screen shot with code similar to this:

Java.Lang.Process sh = Java.Lang.Runtime.GetRuntime().Exec("su", null, null);
System.IO.Stream os = sh.OutputStream;
os.Write(Encoding.Unicode.GetBytes("/system/bin/screencap -p /sdcard/img.png"), 0, 0);
os.Flush();
os.Close();
sh.WaitFor();

but first line gives me exception: Java.IO.IOException: Permission denied

What can I do to get this permission?

I don't want to get screenshot with code like this:

var view = ((Android.App.Activity)MainActivity.Context).Window.DecorView.RootView;
view.DrawingCacheEnabled = true;

Bitmap bitmap = view.GetDrawingCache(true);

byte[] bitmapData;

using (var stream = new MemoryStream())
{
    bitmap.Compress(Bitmap.CompressFormat.Png, 0, stream);
    bitmapData = stream.ToArray();
}

File.WriteAllBytes(screenshotPath, bitmapData);

because it doesn't give me time and other elements visible to user.

score 1 · Accepted Answer · answered Mar 22 '17 at 02:58

1

What can I do to get this permission?

You will have to get your phone/emulator root permission. Without Root, su command is not available for your app.

answered Mar 22 '17 at 02:58

Elvis Xia - MSFT

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And how can I get Root permission? – Uros Mar 22 '17 at 09:20
You can use certain third party tools for rooting ex:[KingRoot](https://www.kingoapp.com/root-tutorials/how-to-root-android.htm). – Elvis Xia - MSFT Mar 22 '17 at 09:45

How to get permission to execute su command from Xamarin Android

1 Answers1