Updated and more useful onBot welcome message. Known issues: Android Studio After updating to the new v3. OnBot Java Sometimes when you push the build button to build all op modes, the RC returns an error message that the build failed.

If you press the build button a second time, the build typically suceeds. Changes with version 3. Web-based programming and management features are "always on" user no longer needs to put Robot Controller into programming mode.

Web-based management interface where user can change Robot Controller name and also easily download Robot Controller log file. OnBot Java, Blocks and Management features available from web based interface.

Fixed tooltip for ColorSensor. Added blocks for ColorSensor. User selectable color themes. Includes many minor enhancements and fixes too numerous to list. Known issues: Auto complete function is incomplete and does not support the following for now : Access via this keyword Access via super keyword Members of the super cloass, not overridden by the class Any methods provided in the current class Inner classes Can't handle casted objects Any objects coming from an parenthetically enclosed expression Version 3.

Added optimized blocks support for Vuforia extended tracking. Added atan2 block to the math category. Incorporates additional improvements to USB comm layer to improve system resiliency to recover from a greater number of communication disruptions. Additional Notes Regarding Version 3. If you upgrade to v3. Instead, v3. We hope to re-introduce this function with a release in the near future.

Includes rewriting sensor classes to implement synchronous I2C communication. Fix to reset Autonomous timer back to 30 seconds. Modest improvements to enhance Wi-Fi P2P pairing. Fixes telemetry log addition race. Publishes all the sources not just a select few. Includes Block programming improvements Addition of optimized Vuforia blocks.

Auto scrollbar to projects and sounds pages. Fixed blocks paste bug. Blocks execute after while-opModeIsActive loop to allow for cleanup before exiting op mode. Added gyro integratedZValue block. Fixes bug with projects page for Firefox browser. Detects REV firmware version and records in log file. Detects and alerts when I2C device disconnect. Version 2. Blocks Programming mode changes: Blocks now ignores a device in the configuration xml if the name is empty.

Other devices work in configuration work fine. Added support for copying blocks in one OpMode and pasting them in an other OpMode. The clipboard content is stored on the phone, so the programming mode server must be running.

Modified Utilities section of the toolbox. In Programming Mode, display information about the active connections.

Fixed paste location when workspace has been scrolled. Added blocks support for the android Accelerometer. Fixed issue where Blocks Upload Op Mode truncated name at first dot. Added blocks support for Android SoundPool. Added type safety to blocks for Acceleration. Added type safety to blocks for AnalogInput. Added type safety to blocks for AngularVelocity. Added type safety to blocks for Color.

Added type safety to blocks for ColorSensor. Added type safety to blocks for CompassSensor. Added type safety to blocks for CRServo.

Added type safety to blocks for DigitalChannel. Added type safety to blocks for ElapsedTime. Added type safety to blocks for Gamepad. Added type safety to blocks for GyroSensor. Added type safety to blocks for IrSeekerSensor. Added type safety to blocks for LED. Added type safety to blocks for LightSensor. Added type safety to blocks for LinearOpMode. Added type safety to blocks for MagneticFlux. Added type safety to blocks for MatrixF. Added type safety to blocks for MrI2cCompassSensor. Added type safety to blocks for MrI2cRangeSensor.

Added type safety to blocks for OpticalDistanceSensor. Added type safety to blocks for Orientation. Added type safety to blocks for Position. Added type safety to blocks for Quaternion. Added type safety to blocks for Servo. Added type safety to blocks for ServoController. Added type safety to blocks for Telemetry. Added type safety to blocks for Temperature.

Added type safety to blocks for TouchSensor. Added type safety to blocks for UltrasonicSensor. Added type safety to blocks for VectorF. Added type safety to blocks for Velocity. Added type safety to blocks for VoltageSensor. Added type safety to blocks for VuforiaLocalizer. Added type safety to blocks for VuforiaTrackable. Added type safety to blocks for VuforiaTrackables.

Added blocks to support Acceleration. Added blocks to support LinearOpMode. Added blocks to support MagneticFlux and Position.

Fixed typos. Made blocks for ElapsedTime more consistent with other objects. Device implementations MUST keep consistency of the Android security and permission model, even if they include runtime environments that execute applications using some other software or technology than the Dalvik Executable Format or native code. Alternate runtimes MAY provide a single Android sandbox shared by all applications using the alternate runtime.

Android includes support for multiple users and provides support for full user isolation and clone user profiles with partial isolation i. If device implementations include support for multiple users, then for all users except users specifically created for running dual instances of the same app, they:. Device implementations MAY create a single additional user profile of type android.

CLONE against the primary user and only against the primary user for the purpose of running dual instances of the same app. These dual instances share partially isolated storage, are presented to the end user in the launcher at the same time and appear in the same recents view. For example, this could be used to support the user installing two separate instances of a single app on a dual-SIM device.

Android includes support for warning users of any outgoing premium SMS message. Premium SMS messages are text messages sent to a service registered with a carrier that may incur a charge to the user.

Device implementations MUST ensure compliance with security features in both the kernel and platform as described below. Kernel integrity and self-protection features are integral to Android security. Android contains multiple defense-in-depth features that are integral to device security. In addition, Android focuses on reducing key classes of common bugs that contribute to poor quality and security. Android stores the history of the user's choices and manages such history by UsageStatsManager.

After the first one second displayed, an indicator can change visually, such as becoming smaller, and is not required to show as originally presented and understood. The microphone indicator may be merged with an actively displayed camera indicator, provided that text, icons, or colors indicate to the user that microphone use has begun.

The camera indicator may be merged with an actively displayed microphone indicator, provided that text, icons, or colors indicate to the user that the camera use has begun. If device implementations have a mechanism, enabled out-of-box by default, that routes network data traffic through a proxy server or VPN gateway for example, preloading a VPN service with android.

If device implementations implement a user affordance to toggle on the "always-on VPN" function of a 3rd-party VPN app, they:. Android, through SpeechRecognizer onDeviceSpeechRecognizer provides ability to perform speech recognition on the device, without involving the network.

Location includes information in the Android Location class such as Latitude, Longitude, Altitude , as well as identifiers that can be converted to Location. The following is a list of location types that either directly derive a user's location or can be converted to a user's location.

This is not a comprehensive list, but should be used as an example on what Location can directly or indirectly be derived from:. Android apps targeting API level 30 or above cannot see details about other installed apps by default see Package visibility in the Android SDK documentation.

If device implementations include additional information e. Android, through BlobStoreManager allows apps to contribute data blobs to the System to be shared with a selected set of apps.

If device implementations support shared data blobs as described in the SDK documentation , they:. Android, through the System API MusicRecognitionManager, supports a mechanism for device implementations to request music recognition, given an audio record, and delegate the music recognition to a privileged app implementing the MusicRecognitionService API. If device implementations include a service that implements the System API MusicRecognitionManager or any proprietary service that streams audio data as described as above, they:.

All devices MUST meet the requirements of section 9. Devices which launched on an API level earlier than that of this document are exempted from the requirements of sections 9. The upstream Android Open Source project provides a preferred implementation of File Based Encryption based on the Linux kernel "fscrypt" encryption feature, and of Metadata Encryption based on the Linux kernel "dm-default-key" feature.

This feature enables users to receive notifications from installed apps after the reboot. For insider attack resistance, we also assume the attacker gains access to broadcast cryptographic signing keys.

By way of example, a device implementation that implements and complies with all of the descriptions found here will be compliant with [C].

The following requirements ensure there is transparency to the status of the device integrity. If device implementations are already launched without supporting Verified Boot on an earlier version of Android and can not add support for this feature with a system software update, they MAY be exempted from the requirement.

Verified Boot is a feature that guarantees the integrity of the device software. If device implementations support the feature, they:. If device implementations are already launched without supporting C through C on an earlier version of Android and can not add support for these requirements with a system software update, they MAY be exempted from the requirements.

If device implementations are already launched without the ability to verify file content against a trusted key on an earlier Android version and can not add support for this feature with a system software update, they MAY be exempted from the requirement. The upstream Android Open Source project provides a preferred implementation of this feature based on the Linux kernel fs-verity feature.

The AOSP implementation follows a tiered authentication model where a knowledge-factory based primary authentication can be backed by either a secondary strong biometric, or by weaker tertiary modalities. Note that the above authentication methods are referred as the recommended primary authentication methods in this document.

If device implementations add or modify the recommended primary authentication methods and use a new authentication method as a secure way to lock the screen, the new authentication method:. If device implementations add or modify the authentication methods to unlock the lock screen if based on a known secret and use a new authentication method to be treated as a secure way to lock the screen:. If device implementations add or modify the recommended primary authentication methods to unlock the lock screen and use a new authentication method that is based on biometrics to be treated as a secure way to lock the screen, the new method:.

If the biometric authentication methods do not meet the requirements for Class 3 formerly Strong as described in section 7. If device implementations add or modify the authentication methods to unlock the lock screen and a new authentication method is based on a physical token or the location:. If device implementations have a secure lock screen and include one or more trust agent, which implements the TrustAgentService System API, they:.

If device implementations add or modify the authentication methods to unlock the lock screen that is not a secure lock screen as described above, and use a new authentication method to unlock the keyguard:.

If device implementations support separate display power states through DeviceStateManager AND support separate display lock states through KeyguardDisplayManager , they:. The Android Keystore System allows app developers to store cryptographic keys in a dedicated secure processor as well as the isolated execution environment described above.

Such a dedicated secure processor is called "StrongBox". Requirements C through C below define the requirements a device must meet to qualify as a StrongBox. The dedicated secure hardware may be used for other purposes as well. IAR will likely become a requirement in a future release. These APIs allows app developers to store and retrieve user identity documents.

Secure isolation MUST block all potential mechanisms by which kernel or userspace code might access the internal state of the isolated environment, including DMA. Android provides Safe Boot Mode, which allows users to boot up into a mode where only preinstalled system apps are allowed to run and all third-party apps are disabled.

This mode, known as "Safe Boot Mode", provides the user the capability to uninstall potentially harmful third-party apps. Android Automotive devices are expected to exchange data with critical vehicle subsystems by using the vehicle HAL to send and receive messages over vehicle networks such as CAN bus.

The data exchange can be secured by implementing security features below the Android framework layers to prevent malicious or unintentional interaction with these subsystems.

If device implementations include a capability to migrate data from a device to another device and do not limit the application data it copies to what is configured by the application developer in the manifest via android:fullBackupContent attribute, they:.

Device implementations MUST pass all tests described in this section. However, note that no software test package is fully comprehensive. This will minimize the risk of introducing bugs that create incompatibilities requiring rework and potential device updates. The CTS is designed to be run on an actual device. Like any software, the CTS may itself contain bugs.

The CTS Verifier is included with the Compatibility Test Suite, and is intended to be run by a human operator to test functionality that cannot be tested by an automated system, such as correct functioning of a camera and sensors.

Any method can be used, provided that it can replace the entirety of the software preinstalled on the device. For instance, any of the following approaches will satisfy this requirement:. That is, the update mechanism MUST preserve application private data and application shared data.

Note that the upstream Android software includes an update mechanism that satisfies this requirement. If the device implementations includes support for an unmetered data connection such as For device implementations that are launching with Android 6. If an error is found in a device implementation after it has been released but within its reasonable product lifetime that is determined in consultation with the Android Compatibility Team to affect the compatibility of third-party applications, then:.

Android includes features that allow the Device Owner app if present to control the installation of system updates.

If the system update subsystem for devices report android. You can join the android-compatibility forum and ask for clarifications or bring up any issues that you think the document does not cover.

Content and code samples on this page are subject to the licenses described in the Content License. Docs Getting Started About. Core Topics Architecture. Introduction This document enumerates the requirements that must be met in order for devices to be compatible with Android Requirements by Device Type Section 2 contains all of the requirements that apply to a specific device type.

When the requirement is conditional, 1 is assigned for the 1st condition and the number increments by 1 within the same section and the same device type. Requirement ID This ID starts from 1 and increments by 1 within the same section and the same condition.

Device Types The Android Open Source Project provides a software stack that can be used for a variety of device types and form factors. Handheld Requirements An Android Handheld device refers to an Android device implementation that is typically used by holding it in the hand, such as an mp3 player, phone, or tablet. Android device implementations are classified as a Handheld if they meet all the following criteria: Have a power source that provides mobility, such as a battery.

Have a physical diagonal screen size in the range of 3. Input : Long press Output : Launch voice command Sends : android. Sends android. Input : Long press Output : Mute or unmute microphone. Input : Short or long press Output : Increases the system or headset volume. Input : Short or long press Output : Decreases the system or headset volume. Input : Short or long press Output : Launch voice command.

The version of the currently-executing Android system, in human-readable format. This field MUST have one of the string values defined in The version of the currently-executing Android system, in a format accessible to third-party application code.

A value chosen by the device implementer designating the specific build of the currently-executing Android system, in human-readable format. A typical use of this field is to indicate which build number or source-control change identifier was used to generate the build.

A value chosen by the device implementer identifying the specific internal hardware used by the device, in human-readable format. A possible use of this field is to indicate the specific revision of the board powering the device. A value reflecting the brand name associated with the device as known to the end users. Native API Compatibility. A value chosen by the device implementer containing the development name or code name identifying the configuration of the hardware features and industrial design of the device.

A string that uniquely identifies this build. A string that uniquely identifies the host the build was built on, in human-readable format. An identifier chosen by the device implementer to refer to a specific release, in human-readable format. This field can be the same as android. The trade of name of the manufacturer of the primary system on chip SOC used in the product. Devices with the same SOC manufacturer should use the same constant value.

Please ask the SOC manufacturer for the correct constant to use. The model name of the primary system on a chip SOC used in the product. Devices with the same SOC model should use the same constant value. A value chosen by the device implementer containing the name of the device as known to the end user. A value chosen by the device implementer containing the development name or code name of the specific product SKU that MUST be unique within the same brand.

MUST be human-readable, but is not necessarily intended for view by end users. An optional value chosen by the device implementer that contains SKU Stock Keeping Unit used to track specific configurations of the device, for example, any peripherals included with the device when sold. A comma-separated list of tags chosen by the device implementer that further distinguishes the build. A value chosen by the device implementer specifying the runtime configuration of the build. This field MUST have one of the values corresponding to the three typical Android runtime configurations: user, userdebug, or eng.

A name or user ID of the user or automated user that generated the build. A value indicating the security patch level of a build. It MUST report the correct value and if such a build does not exist, report an empty string "". Now, you will be able to observe some on-screen instructions. You just need to read then and think before proceeding doing the Factory Reset.

You should never try performing a factory reset unless you encounter the error on multiple applications or if its something too important. Also, this error could simply be a bug in the app, in which case, reporting the bug to the developer, and waiting for an update may be the better option. Do you know about some other interesting methods to fix this issue?

Let us know your thoughts in the comments section below. Filed in Cellphones. It means your messaging app is not compatible with your Android software. If you need to resolve this issue, you can go and find if there is any pending update in your software.

If there is an update available, go through the following steps to initiate it. Before doing a factory reset, make sure you have a complete backup of all your files because you would lose all the data on your phone after this process.

I am certain that any of the above methods or all would help you when the messaging app keeps crashing on Android devices. Each method mentioned above is well described with all the steps along with images for a clear understanding. This issue sometimes happens for unknown reasons, too, and every forum site has users popping out this question to the community members. Did you have any issues with any of these methods? Leave a question down below if you need any help! In this article, we will show….

Crisp large screens and fast internet speeds make watching movies on your Android device a viable alternative in an age in which we seem to…. We sometimes tend to hoard files in our phones. However, the storage space of our Android phones can only store a limited number of data….