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| <h2>Touch Feedback</h2> |
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| <p>Use color and illumination to respond to touches, reinforce the resulting behaviors of gestures, and |
| indicate what actions are enabled and disabled.</p> |
| <p>Whenever a user touches an actionable area in your app, provide a visual response. This lets the |
| user know which object was touched and that your app is "listening".</p> |
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| </div> |
| <div class="layout-content-col span-6"> |
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| <img src="../static/content/touch_feedback_reaction_response.png"> |
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| <h4>States</h4> |
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| <div class="vspace size-1"> </div> |
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| <img src="../static/content/touch_feedback_states.png"> |
| <div class="figure-caption"> |
| Most of Android's UI elements have touch-feedback built in, including states that indicate |
| whether touching the element will have any effect. |
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| <h4>Communication</h4> |
| <p>When your objects react to more complex gestures, help users understand what the outcome of the |
| operation will be. For example, in Recents, when you start swiping a thumbnail left or right, it |
| starts to dim. This helps the user understand that swiping will cause the item to be removed.</p> |
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| </div> |
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| <img src="../static/content/touch_feedback_manipulation.png"> |
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| <img src="../static/content/touch_feedback_communication.png"> |
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| <div class="layout-content-col span-6"> |
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| <div class="vspace size-3"> </div> |
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| <h4>Boundaries</h4> |
| <p>When users try to scroll past the upper or lower limit of a scrollable area, communicate the |
| boundary with a visual cue. For example, if a user attempts to scroll past the first home screen |
| panel, the screen content tilts to the right to indicate that further navigation in this direction |
| is not possible. Many of Android's scrollable UI widgets (e.g. lists or grid lists) already have |
| support for boundary feedback built in. If you are building custom, keep boundary feedback in mind |
| and provide it from within your app.</p> |
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