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Kuaishou Tech

Sep 2, 2021 · Mobile Development

Analyzing the Mystery String Causing Android ANR: Unicode Line‑Breaking and Bidi Algorithm

This article explains why a specially crafted Unicode string triggers an Android ANR by dissecting the Unicode line‑breaking (UAX #14) and bidirectional (UAX #9) algorithms, showing how runs ending with double zeros lead to an infinite loop in TextLine.getOffsetToLeftRightOf.

ANRAndroidBidi

0 likes · 16 min read

Analyzing the Mystery String Causing Android ANR: Unicode Line‑Breaking and Bidi Algorithm

Kuaishou Frontend Engineering

Aug 17, 2021 · Fundamentals

Uncovering the Mystery Behind App ANR Caused by Unicode Bidi Strings

This article continues the investigation of a mysterious string that triggers Android app freezes, explaining Unicode line‑breaking and bidirectional algorithms, how runs end with double zeros, how to craft a reproducing string, and practical ways to avoid the resulting ANR.

ANRAndroidBidi

0 likes · 18 min read

Uncovering the Mystery Behind App ANR Caused by Unicode Bidi Strings