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Last updated 2025-02-10 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-02-10 UTC."],[],[],null,["# Pools.Pool\n\nadded in [version 22.1.0](/topic/libraries/support-library/revisions) \nbelongs to Maven artifact com.android.support:support-compat:28.0.0-alpha1 \nSummary: [Methods](#pubmethods) \\| [\\[Expand All\\]](#) \n\nPools.Pool\n==========\n\n| This package is part of the Android [support library](/topic/libraries/support-library) which is no longer maintained. The support library has been superseded by [AndroidX](/jetpack/androidx) which is part of [Jetpack](/jetpack). We recommend using the AndroidX libraries in all new projects. You should also consider [migrating](/jetpack/androidx/migrate) existing projects to AndroidX. To find the AndroidX class that maps to this deprecated class, see the AndroidX support library [class\n| mappings](/jetpack/androidx/migrate/class-mappings).\n\n\n`\npublic\nstatic\n\n\ninterface\nPools.Pool\n`\n\n\n`\n\n\n`\n\n|-----------------------------------------|\n| android.support.v4.util.Pools.Pool\\\u003cT\\\u003e |\n\n|---|---|\n| Known Indirect Subclasses [Pools.SimplePool](/reference/android/support/v4/util/Pools.SimplePool)\\\u003cT\\\u003e,[Pools.SynchronizedPool](/reference/android/support/v4/util/Pools.SynchronizedPool)\\\u003cT\\\u003e |------------------------------------------------------------------------------------------|--------------------------------------------| | [Pools.SimplePool](/reference/android/support/v4/util/Pools.SimplePool)\\\u003cT\\\u003e | Simple (non-synchronized) pool of objects. | | [Pools.SynchronizedPool](/reference/android/support/v4/util/Pools.SynchronizedPool)\\\u003cT\\\u003e | Synchronized) pool of objects. | ||\n\n\u003cbr /\u003e\n\n*** ** * ** ***\n\nInterface for managing a pool of objects.\n\nSummary\n-------\n\n| ### Public methods ||\n|---------------------|------------------------------------------------------------------------------------------------------------------------|\n| ` abstract T` | ` `[acquire](/reference/android/support/v4/util/Pools.Pool#acquire())`() ` |\n| ` abstract boolean` | ` `[release](/reference/android/support/v4/util/Pools.Pool#release(T))`(T instance) ` Release an instance to the pool. |\n\nPublic methods\n--------------\n\n### acquire\n\nadded in [version 22.1.0](/topic/libraries/support-library/revisions) \n\n```\nT acquire ()\n```\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n| Returns ||\n|-----|-----------------------------------------------------------|\n| `T` | An instance from the pool if such, null otherwise. \u003cbr /\u003e |\n\n### release\n\nadded in [version 22.1.0](/topic/libraries/support-library/revisions) \n\n```\nboolean release (T instance)\n```\n\nRelease an instance to the pool.\n\n\u003cbr /\u003e\n\n| Parameters ||\n|------------|--------------------------------------|\n| `instance` | `T`: The instance to release. \u003cbr /\u003e |\n\n| Returns ||\n|-----------|--------------------------------------------------|\n| `boolean` | Whether the instance was put in the pool. \u003cbr /\u003e |\n\n| Throws ||\n|-------------------------|-----------------------------------------|\n| `IllegalStateException` | If the instance is already in the pool. |\n\n-\n\n Interfaces\n ----------\n\n - [Pools.Pool](/reference/android/support/v4/util/Pools.Pool)\n-\n\n Classes\n -------\n\n - [ArrayMap](/reference/android/support/v4/util/ArrayMap)\n - [ArraySet](/reference/android/support/v4/util/ArraySet)\n - [AtomicFile](/reference/android/support/v4/util/AtomicFile)\n - [CircularArray](/reference/android/support/v4/util/CircularArray)\n - [CircularIntArray](/reference/android/support/v4/util/CircularIntArray)\n - [LongSparseArray](/reference/android/support/v4/util/LongSparseArray)\n - [LruCache](/reference/android/support/v4/util/LruCache)\n - [ObjectsCompat](/reference/android/support/v4/util/ObjectsCompat)\n - [Pair](/reference/android/support/v4/util/Pair)\n - [PatternsCompat](/reference/android/support/v4/util/PatternsCompat)\n - [Pools](/reference/android/support/v4/util/Pools)\n - [Pools.SimplePool](/reference/android/support/v4/util/Pools.SimplePool)\n - [Pools.SynchronizedPool](/reference/android/support/v4/util/Pools.SynchronizedPool)\n - [SimpleArrayMap](/reference/android/support/v4/util/SimpleArrayMap)\n - [SparseArrayCompat](/reference/android/support/v4/util/SparseArrayCompat)"]]
Known Indirect Subclasses