Why does my app throw an `android.permission.REBOOT SecurityException`?

I wrote an Android app that uses android.os.PowerManager.reboot(), and I added <uses-permission android:name="android.permission.REBOOT" /> in my AndroidManifest.xml. However, when I run the app,开发者_运维百科 it always throws the following exception:

java.lang.SecurityException: Neither user 10039 nor current process has android.permission.REBOOT. at android.os.Parcel.readException(Parcel.java:1247)
at android.os.Parcel.readException(Parcel.java:1247)
at android.os.Parcel.readException(Parcel.java:1235)
at android.os.IPowerManager$Stub$Proxy.reboot(IPowerManager.java:427)
at android.os.PowerManager.reboot(PowerManager.java:481)
at Test.testPower(Test.java:374)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:204)
at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:194)
at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:186)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:169)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:154)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:520)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1447)
at android.os.Parcel.readException(Parcel.java:1247)
at android.os.Parcel.readException(Parcel.java:1235)
at android.os.IPowerManager$Stub$Proxy.reboot(IPowerManager.java:427)
at android.os.PowerManager.reboot(PowerManager.java:481)
at com.fsl.cts.FSLPlaybackTest.testPower(FSLPlaybackTest.java:374)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:204)
at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:194)
at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:186)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:169)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:154)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:520)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1447)

Is the anything I'm doing wrong, or does froyo have some problem with rebooting?

You cannot get this permission. Only system applications and applications signed with the same key that was used to sign the firmware will be able to get that permission.

Why do you need to reboot? If you tell the necessity of rebooting, then may be someone can suggest you a better way to accomplish the same thing without rebooting.

It can't be done in stock android phones. But, as I posted in other similar question, if the phone is rooted, then you have no problem at all:

try {
    Runtime.getRuntime().exec("su");
    Runtime.getRuntime().exec("reboot"); }
catch (IOException e) { }

For an explanation, follow the link above.

As far as I know this permission can only be grated to system apps, "user applications" can't get that permission

To reboot the device using code needs REBOOT permission.

This permission is available for system applications. You can make your application a system application only if you have the certificate used in building the system image.

1. Please check the link below on applications being signed with the platform certificate https://groups.google.com/d/msg/android-developers/wsRr-VhzKZ4/dAUbLPszOQ8J
2. http://developer.android.com/guide/topics/security/security.html

It can work:

 String cmd = "su -c shutdown";
         try{
         Runtime.getRuntime().exec(cmd);
   }catch(IOException e){
       e.printStackTrace();
   }
         }

OtherWise,you must add android:sharedUserId="android.uid.system" into your application

If you have root, you can use any of those commands:

"hard root" :

reboot

"soft reboot" :

setprop ctl.restart surfaceflinger; setprop ctl.restart zygote