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slides
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multi touch (https://developer.android.com/training/gestures/multi)
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TouchHelper GestureDetector ScaleGestureDetector
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save state of View OnSaveInstanceState() and OnRestoreInstanceState()
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draw Drawable
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TicketView Sample (https://github.com/vipulasri/TicketView)
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PinEditText Sample (https://github.com/poovamraj/PinEditTextField)
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RulerPicker Sample (https://github.com/kevalpatel2106/android-ruler-picker)
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SurfaceView, TextureView, GlSurfaceView
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drawonsteam
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ArcChartView sample (https://github.com/imaNNeoFighT/arcchartview)
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CustomViewGroup https://github.com/aosp-mirror/platform_frameworks_base/blob/master/core/java/android/widget/AbsoluteLayout.java