android – How can I develop a “widget-app” for third-party cell apps?

Is it doable?

Partially. Straight injecting performance into third-party apps is not allowed attributable to safety considerations. Nonetheless, you may create an SDK (Software program Improvement Equipment) that different builders can combine into their apps to leverage your widget performance.

Greatest instruments?

Android: For Android widgets, you may primarily use the native improvement instruments like Java/Kotlin and the Android SDK. Frameworks like Jetpack Compose can simplify UI improvement.
iOS: For iOS widgets, you may use Swift and the iOS SDK together with SwiftUI for a contemporary UI strategy.
React Native cannot straight create widgets, however you may construct the core logic of your widget app in React Native after which expose it to native improvement by bridges.

Safety restrictions:

Permissions: Your SDK may require particular permissions to entry knowledge or functionalities wanted by the widget. The third-party app developer must request these permissions from the person.
Sandboxing: Each Android and iOS implement sandboxing, limiting what your widget can entry throughout the host app.
App vs. SDK?

An SDK is the higher strategy. It supplies a modular resolution that builders can combine into their apps with out affecting the core performance. Here is why:

Maintainability: You’ll be able to replace your widget performance independently with out requiring updates to the host app.
Flexibility: Builders have extra management over how your widget is built-in into their app’s UI and workflow.
Safety: SDKs implement stricter boundaries, lowering safety dangers.
Here is a roadmap for growing your widget SDK:

Outline Performance: Clearly outline what your widget provides and the info it wants from the host app.
Select Platform: Begin with Android or iOS relying in your audience.
Develop Core Logic: Use the respective native improvement instruments (Java/Kotlin for Android, Swift for iOS) to construct the core functionalities of your widget.
Create Configuration Choices: Enable builders to customise the appear and feel of the widget inside their app.
Present Documentation: Develop complete documentation explaining the right way to combine your SDK and use the widget successfully.