How to disable system dialog window or pop ups in android?

Question

I am finding out a way to switch off my tablet automatically.

Right now when we long press power button, I get a confirmation for shutdown (Cancel or Ok). Is there a way to programmatically switch off the device without confirmation ?

Is this possible?

Answer 1

否。有适当权限的电话/平板电脑通常可以访问su / reboot命令，但对于现成的商用设备而言，没有：无法通过编程方式将其关闭。

Answer 2

This is a dicey one! As an app, you cant do much, but there is one way you can try this. Get a phone which is rooted and grants your application SuperUser permissions. Then you could try to run this piece of code from your APK.

Process mProcess = null;
DataOutputStream osStream;

try {
        mProcess = Runtime.getRuntime().exec("su");
    } catch (IOException e) {
        Log.e("Error","Unable to get SU permissions, quitting");
    }
    osStream = new DataOutputStream(mProcess.getOutputStream());
try {
        osStream.writeBytes("reboot");
        Thread.sleep(1000);
    } catch (IOException e) {
        e.printStackTrace();
    } catch (InterruptedException e) {
        e.printStackTrace();
    }

Not a tested piece of code, but hopefully should give you some idea!

Answer 3

Although you can't really invoke the shutdown programmatically in non-rooted device, there's a way how to disable the confirmation dialog that occurs when you long-press the power button. There's a secret code

*#*#7594#*#* or *#7594#

which changes the power button behaviour - enables direct power off once the code enabled. You need to choose this code via default dialpad. Works on most Android phones.

Here's the list of some other secret codes.