Java

Java refers to Tasker's advanced Java integration features, which allow users to access Android APIs, create and manipulate Java objects, and execute Java-based automation logic. Tasker provides two primary mechanisms for Java integration: Java Function and Java Code.

These features enable advanced users to interact directly with Android's underlying framework and perform actions that may not be available through standard Tasker actions.

Overview

Android is built primarily on Java-based APIs. To provide access to the full Android framework, Tasker includes tools that allow users to call Java methods, work with Android classes, create objects, and execute custom scripts.

Tasker's Java features bridge the gap between traditional Tasker automation and Android application development.

Components

Java Function

Java Function allows users to call individual Java methods and create Java objects directly from a Tasker task.

Features include:

• Calling Android API methods

• Creating Java objects

• Accessing object fields

• Using Android system services

• Working with arrays and collections

• Storing Java objects for later use

Java Function is intended for structured interaction with Android APIs without writing source code.

Example:

Variable Set %service wifi

Java Function wiman = CONTEXT.getSystemService(%service)

Java Function %enabled = wiman.isWifiEnabled()

Java Code

Java Code allows users to write and execute multi-line Java-like scripts using the BeanShell interpreter.

Features include:

• Multi-line scripting

• Variables and functions

• Loops and conditions

• Android API access

• Notification monitoring

• Accessibility integration

• HTTP requests

• JSON processing

• Reactive programming

Java Code provides significantly more flexibility than Java Function and is intended for complex automation scenarios.

Example:

ssid = tasker.getVariable("SSID");

tasker.showToast("Connected to " + ssid);

return ssid;

Java Objects

Tasker can store Java objects between actions.

Local Objects

Objects with lowercase names are available only within the current task.

Example:

wifiManager

myArray

Global Objects

Objects containing uppercase characters are available across tasks.

Example:

sharedList

wifiManagerGlobal

Global objects remain in memory until cleared or Tasker is restarted.

Built-in Objects

Tasker provides several built-in Java objects.

CONTEXT

An Android Context object used to access Android system services and APIs.

IBUFFER

A Bitmap object used by Tasker's image-related actions.

context

A Context object available inside Java Code scripts.

tasker

A helper object available inside Java Code that provides functions for interacting with Tasker.

Android API Access

Tasker's Java features provide access to large portions of the Android framework, including:

• Wi-Fi services

• Bluetooth services

• Notifications

• Accessibility services

• Content providers

• Broadcast receivers

• Activities

• Sensors

• Media services

This allows automations to interact with Android features that may not have dedicated Tasker actions.

Variables and Data Exchange

Java integration can interact directly with Tasker variables.

Supported operations include:

• Reading variables

• Writing variables

• Creating Java variables

• Sharing Java objects between actions

• Passing parameters to tasks

Java Code provides helper functions such as:

• getVariable()

• setVariable()

• getJavaVariable()

• setJavaVariable()

• callTask()

• sendCommand()

Object Creation

Java objects may be created using constructors or factory methods.

Example:

Java Function list = new ArrayList()

Arrays are also supported.

Example:

Java Function arr = new String[](10)

Casting

Tasker supports object casting to specify an object's type.

Example:

(WifiManager) wiman

Casting allows Tasker to expose methods associated with the specified class.

AI Assistance

Tasker's Java Code action includes an AI Code Helper capable of generating Java scripts from natural language descriptions.

Users may generate code directly within Tasker or export instructions for use with external AI systems.

Third-Party Libraries

Java Code includes support for selected libraries.

OkHttp

Used for web requests and API communication.

Coil

Used for image loading and image processing.

RxJava

Used for asynchronous operations, event streams, timers, and reactive programming.

Common Uses

Tasker's Java features are commonly used for:

• Advanced Android automation

• API integration

• Network communication

• Notification monitoring

• Accessibility automation

• File management

• JSON processing

• UI interaction

• Android system service access

Limitations

• Java Function executes one method call per action.

• Java Code uses BeanShell rather than modern Java.

• Some Android APIs require permissions unavailable to Tasker.

• Certain APIs require an Activity context.

• Java Code does not support modern Java features such as lambdas, streams, or generic syntax.

Comparison

Feature

Java Function

Java Code

Create Objects

Yes

Yes

Call Android APIs

Yes

Yes

Multi-line Logic

No

Yes

Loops

No

Yes

Conditions

Limited

Yes

Third-Party Libraries

No

Yes

Reactive Programming

No

Yes

AI Code Generation

No

Yes

Legacy

Java integration has long been considered one of Tasker's most powerful advanced features. It enables users to extend Tasker's capabilities beyond built-in actions and provides direct access to the Android framework without requiring the development of a separate Android application.

See Also

• Tasks

• Variables

• Projects

• App Factory

• Tasker AI Generator

• Android API

• Accessibility Service

• Notification Listener

• Widget v2