Listening for Boot Completed Event on Android; What is it?

Listening for the “Boot Completed” Event Usually displays when you move some system apps or games to your SD card. These apps are loaded automatically after restarting the phone, and the majority of them are system services. 

In this case, it’s the data counter, the contact on the lock screen, the email service, Gmail, the calendar, the market, SMS, and a slew of other system services. As a result, if you move some of the affected apps to the SD card, they will not start after the phone is restarted. 

This shouldn’t be an issue for apps you don’t use, but don’t do it for any of the call or messaging services, or your calls and texts will stop working. 

You can find a list of apps that have this permission in “PermReq,” search for “RECEIVE ROOT COMPLETED,” and move only unimportant apps to SD.

Table of Contents

• Is it a problem to receive the Boot completed event?
• What is Boot completed?
• What does receive boot broadcast mean?
• What is direct boot mode in Android?
• Is Android storage encrypted?
• What are pendingintents in Android?
• Some related FAQs.
  • What exactly is persistent in Android?
  • What exactly is the callback method in Android?
  • What exactly is the Android sandbox?

Is it a problem to receive the Boot completed event?

Because it’s permission-based intent, you shouldn’t install an app if you don’t trust it to detect when the system has been rebooted and then launch at boot time.

However, there are a variety of good reasons for an app to want/need to know that the device has been rebooted so that it can begin preparing to perform the function for which it was downloaded and installed.

As a result of the preceding reason, a disadvantage is that not all apps can be moved using the native apps2sd method.

To ensure that the application consistently behaves as expected, the developer should not allow the application to be installed on external storage if it uses any of the following features due to the aforementioned consequences when the external storage is unmounted: Widgets, Services, Alarm Services, Live Wallpapers, Live Folders, Account Managers, Sync Adapters, Broadcast Receivers listening for “boot completed.”

What is Boot completed?

When Android is booting (or you turned on or rebooted your device for the first time), Android sends a broadcast intent BOOT COMPLETED to notify all applications and services that everything is set up and that Android booting is complete, allowing us to start any other services or applications.

What does receive boot broadcast mean?

An Android component called a broadcast receiver (receiver) allows you to register for system or application events. The Android runtime sends a notification to all registered receivers when an event occurs.

• Applications can, for example, register for the ACTION BOOT COMPLETED system event, which is fired once the Android system has finished booting.
• In addition to static registration, the Context.registerReceiver method can be used to dynamically register a receiver.
• The receiver’s implementing class extends the BroadcastReceiver class.
• The Android system calls the receiver’s onReceive method if the event for which the broadcast receiver has been registered occurs.
• The Android system is allowed to recycle the receiver after the receiver class’s onReceive function has been completed.

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What is direct boot mode in Android?

Apps do not run in Direct Boot mode by default. You can register app components that should be run during Direct Boot mode if your app needs to take action during this mode. The following are some common use cases for apps that need to run in Direct Boot mode:

• Alarm clock apps, for example, have scheduled notifications.
• Apps that send important notifications to users, such as SMS apps.
• Talkback, for example, is an app that provides accessibility services.

Use device encrypted storage if your app needs to access data while running in Direct Boot mode. Data is encrypted in device encrypted storage using a key that is only available after a device has completed a successfully verified boot.

Use credential encrypted storage for data that should be encrypted with a key associated with user credentials, such as a PIN or password. 

Only after the user has successfully unlocked the device is credential encrypted storage available, and only until the user restarts the device. 

After unlocking the device, the user can enable the lock screen, but this does not lock the credential encrypted storage.

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Is Android storage encrypted?

File-based encryption is supported in Android 7.0 and later. Different files can be encrypted with different keys that can be unlocked independently with file-based encryption.

Direct Boot, which allows encrypted devices to boot straight to the lock screen, and allows quick access to important device features like accessibility services and alarms, is available on file-based encryption devices.

Apps can operate in a limited context thanks to file-based encryption and APIs that make apps aware of encryption. This can happen even before users have given their credentials while still protecting private user data.

What are pendingintents in Android?

A PendingIntent is simply a reference to a token kept by the system that describes the original data that was used to retrieve it. 

This means that even if its owning application’s process is terminated, the PendingIntent will still be available to other processes that have been assigned to it. Suppose the creating application later retrieves the same type of PendingIntent (same operation, same Intent action, same flags, categories, components, and data). In that case, it will receive a PendingIntent representing the same token if it is still valid and can thus cancel it.

Some related FAQs.

What exactly is persistent in Android?

Persistent data is information you want to be available even after completely closing and restarting your app. The three most common methods for storing this data locally are SharedPreferences, a local database, and the file system (store data as a file).

What exactly is the callback method in Android?

In Android development, callbacks are everywhere. That’s because they have a job to do, and they do it well! A callback is a function that is passed as an argument into another function and then invoked inside the outer function to complete some kind of routine or action.

What exactly is the Android sandbox?

Android uses the UID to create a kernel-level Application Sandbox. The kernel enforces the security between apps and the system at the process level by using standard Linux facilities such as app-assigned user and group IDs. Apps cannot interact with one another and have limited access to the operating system by default.