Most commonly, a contract is written and signed by the parties. However, there are several other types of contracts that are considered enforceable. There are even some that are not considered enforceable and serve only as a way for a court to determine the obligation on the part of either party.
A SeekBar which supports compatible features on older version of the platform. A SeekBar is an extension of ProgressBar that adds a draggable thumb. The user can touch the thumb and drag left or right to set the current progress level or use the arrow keys. Placing focusable widgets to the left or right of a SeekBar is discouraged. Clients of the SeekBar can attach a SeekBar.OnSeekBarChangeListener to be notified of the user's actions.
Grab bar. Grab bars are safety devices designed to enable a person to maintain balance, lessen fatigue while standing, hold some of their weight while maneuvering, or have something to grab onto in case of a slip or fall. A caregiver may use a grab bar to assist with transferring a patient from one place to another. A worker may use a grab bar to hold on to as he or she climbs, or in case of a fall.