Restarting a device programmatically

In my android application, I want to restart my android device on button click. But its not working.
I have done this so far.

ImageButton restartmob = (ImageButton) this.findViewById(R.id.restartmob);
    restartmob.setOnClickListener(new ImageButton.OnClickListener() {
        @Override
        public void onClick(View v) {
            Process proc = null;            
            try {
               //proc = Runtime.getRuntime().exec(new String[] { "su", "-c", "reboot" });
                 proc = Runtime.getRuntime().exec(new String[]{"/system/bin/su","-c","reboot now"});
                proc.waitFor();
            } catch (Exception ex) {
                Log.i(TAG, "Could not reboot", ex);
            }
        }
    });

Also I put the following permission in the manifest file.

<permission android:name="android.permission.REBOOT"/>

When I clicked the image button to restart, I got the following exception.

java.io.IOException: Error running exec(). Command: [/system/bin/su, -c, reboot now] 
Working Directory: null Environment: null   
at java.lang.ProcessManager.exec(ProcessManager.java:211)   
at java.lang.Runtime.exec(Runtime.java:173)
at java.lang.Runtime.exec(Runtime.java:128)
at com.android.onlinepayment.activity.SystemSubMenuActivity$1.onClick(SystemSubMenuActivity.java:49)
at android.view.View.performClick(View.java:5184)   
at android.view.View$PerformClick.run(View.java:20910)  
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5942)    
at java.lang.reflect.Method.invoke(Native Method)   
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1388  
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1183)
Caused by: java.io.IOException: No such file or directory   
at java.lang.ProcessManager.exec(Native Method)
at java.lang.ProcessManager.exec(ProcessManager.java:209)
... 13 more

What's wrong with my code? Please help me on this.
For the info, I am testing on android Lollipop (if it matters).
Thanks in Advance.

Solution 1:

The permission you required is not related to your reboot method, as your method requires a rooted phone (with su). To reboot the phone, require the permission as you did, but call PowerManager#reboot.

PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
pm.reboot(null);

Solution 2:

On API 24 if your app is the device owner app you can call: devicePolicyManager.reboot(yourAdminComponent)

See docs here

Solution 3:

Try this...

try {
      Process proc = Runtime.getRuntime().exec(new String[] { "su", "-c", "reboot" });
      proc.waitFor();
         } catch (Exception ex) {
                Log.i(TAG, "Could not reboot", ex);
      }

Add permission reboot

Solution 4:

You cannot do a reboot from an ordinary SDK application. Only applications signed with the system firmware signing key can do this. Copied from this answer,

Programmatically switching off Android phone

You need the system key to sign your app. See this post for details;

How to compile Android Application with system permissions