# MotionLayout.MotionTracker

Artifact: [androidx.constraintlayout:constraintlayout](https://developer.android.com/jetpack/androidx/releases/constraintlayout) [View Source](https://cs.android.com/search?q=file:androidx/constraintlayout/motion/widget/MotionLayout.java+class:androidx.constraintlayout.motion.widget.MotionLayout.MotionTracker) Added in [2.2.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#2.2.2)

*** ** * ** ***


```
protected interface MotionLayout.MotionTracker
```

<br />

*** ** * ** ***

Subclasses can override to build test frameworks

## Summary

| ### Public functions |
|---|---|
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/motion/widget/MotionLayout.MotionTracker#addMovement(android.view.MotionEvent)(event: https://developer.android.com/reference/android/view/MotionEvent.html!)` |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/motion/widget/MotionLayout.MotionTracker#clear()()` |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/motion/widget/MotionLayout.MotionTracker#computeCurrentVelocity(int)(units: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)` |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/motion/widget/MotionLayout.MotionTracker#computeCurrentVelocity(int,float)(units: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, maxVelocity: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/motion/widget/MotionLayout.MotionTracker#getXVelocity()()` |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/motion/widget/MotionLayout.MotionTracker#getXVelocity(int)(id: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)` |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/motion/widget/MotionLayout.MotionTracker#getYVelocity()()` |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/motion/widget/MotionLayout.MotionTracker#getYVelocity(int)(id: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)` |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/motion/widget/MotionLayout.MotionTracker#recycle()()` |

## Public functions

### addMovement

Added in [2.2.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#2.2.2)

```
fun addMovement(event: MotionEvent!): Unit
```

### clear

Added in [2.2.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#2.2.2)

```
fun clear(): Unit
```

### computeCurrentVelocity

Added in [2.2.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#2.2.2)

```
fun computeCurrentVelocity(units: Int): Unit
```

### computeCurrentVelocity

Added in [2.2.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#2.2.2)

```
fun computeCurrentVelocity(units: Int, maxVelocity: Float): Unit
```

### getXVelocity

Added in [2.2.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#2.2.2)

```
fun getXVelocity(): Float
```

### getXVelocity

Added in [2.2.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#2.2.2)

```
fun getXVelocity(id: Int): Float
```

### getYVelocity

Added in [2.2.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#2.2.2)

```
fun getYVelocity(): Float
```

### getYVelocity

Added in [2.2.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#2.2.2)

```
fun getYVelocity(id: Int): Float
```

### recycle

Added in [2.2.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#2.2.2)

```
fun recycle(): Unit
```