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Anyone know about the detail? Any website or suggestion?
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There are 2 types of progress bars: determinate and indeterminate. The former is used when the amount of information that needs to be loaded is detectable. The latter is used when the system is unsure how much needs to be loaded or how long it will take.
A progress bar is a graphical control element used to visualize the progression of an extended computer operation, such as a download, file transfer, or installation. Sometimes, the graphic is accompanied by a textual representation of the progress in a percent format.
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.
We can display the android progress bar dialog box to display the status of work being done e.g. downloading file, analyzing status of work etc. In this example, we are displaying the progress dialog for dummy file download operation. Here we are using android. app. ProgressDialog class to show the progress bar.
From the source:
There is also a secondary progress displayable on a progress bar which is useful for displaying intermediate progress, such as the buffer level during a streaming playback progress bar.
One can find a fully worked example of displaying such a bar, including screenshots of the appearance of such a bar in a particular style (circular bar which fills from the bottom):
In the image above, the secondary bar is the green area, when it reaches the top, some subtask is complete.
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