Android Study Notes (24): progress bar component and its subclass

Android Study Notes (24): progress bar component and its subclass

ProgressBar is used as the progress bar component. It also derives SeekBar (drag bar) and RatingBar (star rating bar ).

XML attributes supported by ProgressBar:

Attribute Name	Related Method	Description
Style		Set ProgressBar to specify the style
Android: indeterminate		When it is set to true, the progress bar does not display progress
Android: indeterminateBehavior		In indeterminate mode, the animation processing behavior when the progress bar reaches the maximum value: "Repeat" | Animation. RESTART, where the Animation starts from the beginning. "Cycle" | Animation. REVERSE. The Animation is executed from the beginning.
Android: indeterminateDrawable		The Drawable object used in indeterminate mode. If the object is an animation object (inherited from Animatable), the animation will be started in the onDraw method.
Android: indeterminateDuration		Duration of the progress bar in indeterminate Mode
Android: indeterminateOnly		Force indeterminate Mode
Android: max		Set the maximum value of this progress bar
Android: maxHeight		Set the ProgressBar Specification
Android: maxWidth
Android: minHeight
Android: minWidth
Android: progress		Set the progress value of this progress bar.
Android: progressDrawable		Set the Drawable object of the progress bar

Attribute values supported by style:

@ Android: style/Widget. ProgressBar. Horizontal: Horizontal progress bar

@ Android: style/Widget. ProgressBar. Inverse: general-sized ring progress bar

@ Android: style/Widget. ProgressBar. Large: Large ring progress bar

@ Android: style/Widget. ProgressBar. Large. Inverse: Large ring progress bar

@ Android: style/Widget. ProgressBar. Small: Small Ring progress bar

@ Android: style/Widget. ProgressBar. Small. Inverse: Small Ring progress bar

The progressDrawable attribute can be set to a LayerDrawable object, indicating that the progress of completion and the progress of unfinished display are different images. LayerDrawable objects can be used in XML files. Element configuration.

You can perform the following operations on the progress:

SetProgress (int): Set the percentage of progress completed.

IncrementProgressBy (int): sets the progress to increase or decrease (plus or minus)

In addition, there is a progress bar directly displayed on the window title in Android, which is directly enabled by the Activity method:

RequestWindowFeature () is used to set the progress bar that does not display progress when the input parameter Window. FEATURE_INDETERMINATE_PROGRESS is set. The input parameter Window. FEATURE_PROGRESS is used to set the progress bar. SetProgressBarIndeterminateVisibility (boolean) and setProgressBarVisibility (boolean) set the display and hide of the progress bar.

Drag a SeekBar

The corresponding value can be obtained through the slider position.

Android: thumb: Specifies the Drawable object of the slider.

To monitor the variation of the slider position, you need to bind an OnSeekBarChangeListener listener to it.

RatingBar

Progress is represented by the star level.

XML attributes supported by RatingBar:

Attribute Name	Related Method	Description
Android: isIndicator		Set whether the star rating bar can be changed
Android: numStars		Set the total number of stars in a star rating bar
Android: rating		Set the default star rating
Android: stepSize		Set the minimum number of stars to be changed each time

To monitor changes in the star rating bar, you need to bind an OnRatingBarChangeListener listener to it.