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Copy file name to clipboardExpand all lines: docs/html/design/building-blocks/dialogs.jd
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<div class="with-callouts">
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<ol>
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<li>
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<h4>Optional title region</h4>
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<p>The title introduces the content of your dialog. It can, for example, identify the name of a
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setting that the user is about to change, or request a decision.</p>
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</li>
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<li>
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<h4>Content area</h4>
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<p>Dialog content varies widely. For settings dialogs, a dialog may contain UI elements such as
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sliders, text fields, checkboxes, or radio buttons that allow the user to change app or system
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settings. In other cases, such as alerts, the content may consist solely of text that provides
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further context for a user decision.</p>
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</li>
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<li>
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<h4>Action buttons</h4>
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<p>Action buttons are typically Cancel and/or OK, with OK indicating the preferred or most likely action. However, if the options consist of specific actions such as Close or Wait rather than a confirmation or cancellation of the action described in the content, then all the buttons should be active verbs. Order actions following these rules:</p>
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<ul>
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<li>The dismissive action of a dialog is always on the left. Dismissive actions return to the user to the previous state.</li>
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<li>The affirmative actions are on the right. Affirmative actions continue progress toward the user goal that triggered the dialog.</li>
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</ul>
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</li>
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<li>
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<h4>Optional title region</h4>
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<p>The title introduces the content of your dialog. It can, for example, identify the name of a
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setting that the user is about to change, or request a decision.</p>
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</li>
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<li>
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<h4>Content area</h4>
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<p>Dialog content varies widely. For settings dialogs, a dialog may contain UI elements such as
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sliders, text fields, checkboxes, or radio buttons that allow the user to change app or system
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settings. In other cases, such as alerts, the content may consist solely of text that provides
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further context for a user decision.</p>
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</li>
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<li>
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<h4>Action buttons</h4>
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<p>Action buttons are typically Cancel and/or OK, with OK indicating the preferred or most likely
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action. However, if the options consist of specific actions such as Close or Wait rather than
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a confirmation or cancellation of the action described in the content, then all the buttons
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should be active verbs. As a rule, the dismissive action of a dialog is always on the left
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whereas the affirmative actions are on the right.</p>
<p>Progress bars and activity indicators signal to users that something is happening that will take a moment.</p>
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<h2 id="progress">Progress bars</h2>
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<p>When an operation of interest to the user is taking place over a relatively long period of time,
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provide visual feedback that it's still happening and in the process of being completed.</p>
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<h2 id="progress">Progress</h2>
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<p>Progress bars are for situations where the percentage completed can be determined. They give users a quick sense of how much longer an operation will take.</p>
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<p>If you know the percentage of the operation that has been completed, use a determinate progress bar
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to give the user a sense of how much longer it will take.</p>
<p>A progress bar should always fill from 0% to 100% and never move backwards to a lower value. If multiple operations are happening in sequence, use the progress bar to represent the delay as a whole, so that when the bar reaches 100%, it doesn't return back to 0%.</p>
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<p>The progress bar should always travel from 0% to 100% completion. Avoid setting the bar to a lower
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value than a previous value, or using the same progress bar to represent the progress of multiple
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events, since doing so makes the display meaningless. If you're not sure how long a particular
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operation will take, use an indeterminate progress indicator.</p>
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<div class="vspace size-2"> </div>
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Progress bar in Holo Dark and Holo Light.
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</div>
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<h2 id="activity">Activity indicators</h2>
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<h2 id="activity">Activity</h2>
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<p>Activity indicators are for operations of an indeterminate length. They ask users to wait a moment while something finishes up, without getting into specifics about what's happening behind the scenes.</p>
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<p>If you don't know how much longer an operation will continue, use an indeterminate progress
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indicator. There are two styles available: a flat bar and a circle. Use the one that best fits the
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available space.</p>
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<p>Two styles are available: a bar and a circle. Each is offered in a variety of sizes, in both Holo Light and Holo Dark themes. Choose the appropriate style and size for the surrounding context. For example, the largest activity circle works well when displayed in a blank content area, but not in a smaller dialog box. Each operation should only be represented by one activity indicator.</p>
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<div class="layout-content-row">
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<p>In this example, an activity bar (in Holo Dark) appears when a user first requests a download. There's an unknown period of time when the download has not yet started. As soon as the download starts, this activity bar transforms into a progress bar.</p>
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<li class="value-1"><h4>Activity bar (shown with the Holo Dark theme)</h4>
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<p>
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An indeterminate activity bar is used at the start of an application download because the Play Store
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app hasn't been able to contact the server yet, and it's not possible to determine how long it will
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take for the download to begin.
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</p>
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</li>
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</ol>
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<p>In this example, an activity circle (in Holo Light) is used in the Gmail application when a message is being loaded because it's not possible to determine how long it will take to download the email.</p>
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<p>When displaying an activity circle, do not include text to communicate what the app is doing. The moving circle alone provides sufficient feedback about the delay, and does so in an understated way that minimizes the impact.</p>
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<li class="value-2"><h4>Activity circle (shown with the Holo Light theme)</h4>
An indeterminate activity circle is used in the Gmail application when a message is being
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loaded because it's not possible to determine how long it will take to download the email.
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</p>
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</li>
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</ol>
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</div>
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</div>
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<h2 id="custom-indicators">Custom indicators</h2>
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<p>The standard progress bar and activity indicators work well for most situations and should be used whenever possible to provide a consistent experience across Android. However, some situations may call for something more custom.</p>
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<p>Here's an example:<br>
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In all of the Google Play apps (Music, Books, Movies, Magazines), we wanted the current download state of each item to be visible at all times at the top-level screen. These states are:
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<ul>
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<li>Not downloaded</li>
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<li>Temporarily downloaded (automatically cached by the app)</li>
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<li>Permanently downloaded on the device at the user's request</li>
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</ul>
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</p>
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<p>We also needed to indicate progress from one download state to another, because downloading is not instantaneous.</p>
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<p>This presented a challenge, because the Google Play apps use a variety of different layouts, and some of them are highly space-constrained. We didn't want this information to clutter the top-level screens, or compete too much with the cover art.</p>
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<p>So we designed a custom indicator that could show all of the information in a tiny footprint, with the flexibility to appear on top of content if necessary.</p>
<p>The color indicates whether it's downloaded (blue) or not (gray). The appearance of the pin indicates whether the download is permanent (white, upright) or temporary (gray, diagonal). And when state is in the process of changing, progress is indicated by a moving pie chart.</p>
Across Google Play apps with different layouts, the same custom indicator appears with each item. It communicates download state as well as progress, in a compact package that can be incorporated into any screen design.
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</div>
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</div>
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</div>
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<p>If you find that the standard indicators aren't meeting your needs (due to space constraints, state complexities), by all means design your own. Make it feel like part of the Android family by injecting some of the visual characteristics of the standard indicators. In this example, we carried over the circular shape, the same shade of blue, and the flat and simple style.</p>
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<p>You should only use one activity indicator on screen per activity, and it should appropriately sized
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for the surrounding context. For example, the largest activity circle works well when displayed in a
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blank content area, but not in a smaller dialog box.</p>
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