Determining If an Android Device Is Rooted Programmatically

Determining if an Android device is rooted programmatically?

Rooting detection is a cat and mouse game and it is hard to make rooting detection that will work on all devices for all cases.

See Android Root Beer https://github.com/scottyab/rootbeer for advanced root detection which also uses JNI and native CPP code compiled into .so native library.

If you need some simple and basic rooting detection check the code below:

  /**
   * Checks if the device is rooted.
   *
   * @return <code>true</code> if the device is rooted, <code>false</code> otherwise.
   */
  public static boolean isRooted() {

    // get from build info
    String buildTags = android.os.Build.TAGS;
    if (buildTags != null && buildTags.contains("test-keys")) {
      return true;
    }

    // check if /system/app/Superuser.apk is present
    try {
      File file = new File("/system/app/Superuser.apk");
      if (file.exists()) {
        return true;
      }
    } catch (Exception e1) {
      // ignore
    }

    // try executing commands
    return canExecuteCommand("/system/xbin/which su")
        || canExecuteCommand("/system/bin/which su") || canExecuteCommand("which su");
  }

  // executes a command on the system
  private static boolean canExecuteCommand(String command) {
    boolean executedSuccesfully;
    try {
      Runtime.getRuntime().exec(command);
      executedSuccesfully = true;
    } catch (Exception e) {
      executedSuccesfully = false;
    }

    return executedSuccesfully;
  }

Probably not always correct. Tested on ~10 devices in 2014.

How can you detect if the device is rooted in the app?

At the end of the day, you can't. A rooted device may be modified in any way, and thus can completely hide whatever it wants from you. In practice you could look at some of the standard root builds to find features they have or characteristics you can look at... but there is no way to guarantee that whatever you do will actually detect a "rooted" device.

How to programmatically turn on (Power-On) the android device at a certain time?

Here is a solution(tested on Lenovo A516, API LEVEL 17, but it should work similar for other devices with "Scheduled power On/Off feature" like described here):

Uninstall /system/app/SchedulePowerOnOff.apk

Compile and install this code

enableAlertPowerOn(...) is the function where the magic happens:

private static void enableAlertPowerOn(Context context, long atTimeInMillis){
   AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
   Intent intent = new Intent(context, SchPwrOnReceiver.class);
   PendingIntent sender = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);
   am.set(7, atTimeInMillis, sender);
}

SchPwrOnReceiver.java:

package com.mediatek.schpwronoff.receivers;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class SchPwrOnReceiver extends BroadcastReceiver {
    private static final int STALE_WINDOW = 1800;
    private static final String TAG = "SchPwrOnReceiver";

    @Override
    public void onReceive(Context context, Intent intent) {
        //TODO optional
    }
}

build.gradle(:app), applicationId has to be "com.mediatek.schpwronoff":

apply plugin: 'com.android.application'

android {
  compileSdkVersion 29
  defaultConfig {
    applicationId "com.mediatek.schpwronoff"
    minSdkVersion 17
    targetSdkVersion 29
    versionCode 17
    versionName "4.2.2"
  }
  buildTypes {
    release {
      minifyEnabled false
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
  }
}

dependencies {
  implementation 'com.android.support:support-compat:28.0.0'
}

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="17" android:versionName="4.2.2" package="com.mediatek.schpwronoff">   

<application
    android:name=".MYApplication"
    android:allowBackup="false"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity"
       android:launchMode="singleTop">
       <intent-filter>
         <action android:name="android.intent.action.MAIN" />

         <category android:name="android.intent.category.LAUNCHER" />
       </intent-filter>
    </activity>
           <receiver android:name=".receivers.SchPwrOnReceiver">
             <intent-filter>
                 <action android:name="com.android.settings.schpwronoff.PWR_ON_ALERT"/>
             </intent-filter>
          </receiver>      
  </application>

</manifest>

Example how to call enableAlertPowerOn(Context context, long atTimeInMillis) from Activity:

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
        showDateTimePickerPowerOn(this);
  }

public void showDateTimePickerPowerOn(Context context) {
          final Calendar currentDate = Calendar.getInstance();
          date = Calendar.getInstance();
          new DatePickerDialog(context, new DatePickerDialog.OnDateSetListener() {
              @Override
              public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                  date.set(year, monthOfYear, dayOfMonth);
                  new TimePickerDialog(context, new TimePickerDialog.OnTimeSetListener() {
                      @Override
                      public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                          date.set(Calendar.HOUR_OF_DAY, hourOfDay);
                          date.set(Calendar.MINUTE, minute);
                          date.set(Calendar.SECOND, 0);                             

                          long cTimeInMillis = date.getTimeInMillis();
                          enableAlertPowerOn(context, cTimeInMillis);
                      }
                  }, currentDate.get(Calendar.HOUR_OF_DAY), currentDate.get(Calendar.MINUTE), true).show();
              }
          }, currentDate.get(Calendar.YEAR), currentDate.get(Calendar.MONTH), currentDate.get(Calendar.DATE)).show();
}

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