restart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


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

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



            }

 <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <action android:name="android.intent.action.BOOT_COMPLETED" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

[SRC XML]

<uses-permission
        android:name="android.permission.REBOOT"
        android:maxSdkVersion="29"
        tools:ignore="ProtectedPermissions" />