android.view.InflateException: Binary XML file line #XX: Binary XML file line #XX: Error inflating class androidx.constraintlayout.widget.ConstraintLayout. Cause: java.lang.IllegalArgumentException: The given output must be a different layout from the input. Parallel constraints not supported.
ID: android/layout-inflate-constraintlayout-parallel-constraint
Version Compatibility
| Version | Status | Introduced | Deprecated | Notes |
|---|---|---|---|---|
| ConstraintLayout 2.1.4 | active | — | — | — |
| ConstraintLayout 2.2.0 | active | — | — | — |
| AndroidX 1.6.0 | active | — | — | — |
Root Cause
ConstraintLayout XML contains conflicting or parallel constraints (e.g., both `layout_constraintLeft_toLeftOf` and `layout_constraintRight_toRightOf` on the same view without proper chain or bias) that the layout parser cannot resolve during inflation.
generic中文
ConstraintLayout XML 包含冲突或并行的约束（例如，同一视图上同时使用 `layout_constraintLeft_toLeftOf` 和 `layout_constraintRight_toRightOf`，而没有正确的链或偏差），导致布局解析器在膨胀时无法解决。
Official Documentation
https://developer.android.com/reference/androidx/constraintlayout/widget/ConstraintLayoutWorkarounds
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90% success In your XML layout, identify the view causing the error and remove one of the parallel constraints. For example, if a TextView has both `app:layout_constraintLeft_toLeftOf="parent"` and `app:layout_constraintRight_toRightOf="parent"`, replace them with `app:layout_constraintStart_toStartOf="parent"` and `app:layout_constraintEnd_toEndOf="parent"` to create a centered horizontal constraint, or use a chain with `app:layout_constraintHorizontal_chainStyle="packed"`.
In your XML layout, identify the view causing the error and remove one of the parallel constraints. For example, if a TextView has both `app:layout_constraintLeft_toLeftOf="parent"` and `app:layout_constraintRight_toRightOf="parent"`, replace them with `app:layout_constraintStart_toStartOf="parent"` and `app:layout_constraintEnd_toEndOf="parent"` to create a centered horizontal constraint, or use a chain with `app:layout_constraintHorizontal_chainStyle="packed"`.
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85% success Wrap the conflicting view in a nested ConstraintLayout or use a different layout container like LinearLayout to avoid parallel constraints entirely.
Wrap the conflicting view in a nested ConstraintLayout or use a different layout container like LinearLayout to avoid parallel constraints entirely.
中文步骤
In your XML layout, identify the view causing the error and remove one of the parallel constraints. For example, if a TextView has both `app:layout_constraintLeft_toLeftOf="parent"` and `app:layout_constraintRight_toRightOf="parent"`, replace them with `app:layout_constraintStart_toStartOf="parent"` and `app:layout_constraintEnd_toEndOf="parent"` to create a centered horizontal constraint, or use a chain with `app:layout_constraintHorizontal_chainStyle="packed"`.
Wrap the conflicting view in a nested ConstraintLayout or use a different layout container like LinearLayout to avoid parallel constraints entirely.
Dead Ends
Common approaches that don't work:
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80% fail
The Layout Editor often generates parallel constraints automatically when dragging; manual removal without understanding the conflict can reintroduce the same error.
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85% fail
The error is a validation issue in the XML, not a library bug; downgrading may hide the symptom but the underlying constraint conflict remains and can cause runtime crashes.