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

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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

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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