Exploring FLAG_ACTIVITY_NEW_TASK and Activity Stack Validation in Android

The article investigates a real‑world Android navigation bug by dissecting how FLAG_ACTIVITY_NEW_TASK interacts with launch modes, task affinities and intent construction, revealing that the flag does not always behave like singleTask, that START_DELIVERED_TO_TOP may fail to deliver new intents, and offering debugging steps and practical fixes.

ActivityAndroidFLAG_ACTIVITY_NEW_TASK

0 likes · 23 min read

Exploring FLAG_ACTIVITY_NEW_TASK and Activity Stack Validation in Android

Sohu Tech Products

Dec 22, 2021 · Mobile Development

In-depth Source Code Investigation of FLAG_ACTIVITY_NEW_TASK Causing Activity Launch Failure

This article analyzes why adding the FLAG_ACTIVITY_NEW_TASK flag can prevent an Android Activity from starting, examines the underlying framework source code—including startActivityInner, getReusableTask, recycleTask, and complyActivityFlags—and provides practical solutions to resolve the launch failure.

ActivityAndroidDebugging

0 likes · 18 min read

In-depth Source Code Investigation of FLAG_ACTIVITY_NEW_TASK Causing Activity Launch Failure

Huajiao Technology

Mar 10, 2020 · Mobile Development

Mastering Android Activity Tasks and Launch Modes: A Deep Dive into Intent Flags

This article explains what an Android task is, how to manage tasks with different launch modes, how to inspect the current task stack via the device UI or adb, and provides detailed descriptions of common Intent flags and their effects on activity behavior.

ActivityAndroidIntentFlags

0 likes · 14 min read

Mastering Android Activity Tasks and Launch Modes: A Deep Dive into Intent Flags

Tencent Music Tech Team

Jun 2, 2016 · Mobile Development

Ensuring a Single Instance of the Main Activity in Android Using a Dispatcher Activity

To guarantee a single persistent main Activity while allowing sub‑Activities and third‑party navigation, the article proposes routing all external and internal launches through a dedicated DispatcherActivity that uses FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TOP, a static weak reference, and onNewIntent handling, avoiding singleTask/instance modes.

ActivityAndroidDispatcher

0 likes · 14 min read

Ensuring a Single Instance of the Main Activity in Android Using a Dispatcher Activity