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Android APIs
public abstract class

AbsSeekBar

extends ProgressBar
java.lang.Object
   ↳ android.view.View
     ↳ android.widget.ProgressBar
       ↳ android.widget.AbsSeekBar
Known Direct Subclasses

Summary

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Inherited XML Attributes
From class android.widget.ProgressBar
From class android.view.View
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Inherited Constants
From class android.view.View
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Inherited Fields
From class android.view.View
Public Constructors
AbsSeekBar ( Context context)
AbsSeekBar ( Context context, AttributeSet attrs)
AbsSeekBar ( Context context, AttributeSet attrs, int defStyle)
Public Methods
int getKeyProgressIncrement ()
Returns the amount of progress changed via the arrow keys.
Drawable getThumb ()
Return the drawable used to represent the scroll thumb - the component that the user can drag back and forth indicating the current value by its position.
int getThumbOffset ()
void jumpDrawablesToCurrentState ()
Call Drawable.jumpToCurrentState() on all Drawable objects associated with this view.
void onInitializeAccessibilityEvent ( AccessibilityEvent event)
Initializes an AccessibilityEvent with information about this View which is the event source.
void onInitializeAccessibilityNodeInfo ( AccessibilityNodeInfo info)
Initializes an AccessibilityNodeInfo with information about this view.
boolean onKeyDown (int keyCode, KeyEvent event)
Default implementation of KeyEvent.Callback.onKeyDown() : perform press of the view when KEYCODE_DPAD_CENTER or KEYCODE_ENTER is released, if the view is enabled and clickable.
void onRtlPropertiesChanged (int layoutDirection)
Called when any RTL property (layout direction or text direction or text alignment) has been changed.
boolean onTouchEvent ( MotionEvent event)
Implement this method to handle touch screen motion events.
boolean performAccessibilityAction (int action, Bundle arguments)
Performs the specified accessibility action on the view.
void setKeyProgressIncrement (int increment)
Sets the amount of progress changed via the arrow keys.
synchronized void setMax (int max)

Set the range of the progress bar to 0...

void setThumb ( Drawable thumb)
Sets the thumb that will be drawn at the end of the progress meter within the SeekBar.
void setThumbOffset (int thumbOffset)
Sets the thumb offset that allows the thumb to extend out of the range of the track.
Protected Methods
void drawableStateChanged ()
This function is called whenever the state of the view changes in such a way that it impacts the state of drawables being shown.
synchronized void onDraw ( Canvas canvas)
Implement this to do your drawing.
synchronized void onMeasure (int widthMeasureSpec, int heightMeasureSpec)

Measure the view and its content to determine the measured width and the measured height.

void onSizeChanged (int w, int h, int oldw, int oldh)
This is called during layout when the size of this view has changed.
boolean verifyDrawable ( Drawable who)
If your view subclass is displaying its own Drawable objects, it should override this function and return true for any Drawable it is displaying.
[Expand]
Inherited Methods
From class android.widget.ProgressBar
From class android.view.View
From class java.lang.Object
From interface android.graphics.drawable.Drawable.Callback
From interface android.view.KeyEvent.Callback
From interface android.view.accessibility.AccessibilityEventSource

Public Constructors

public AbsSeekBar ( Context context)

Added in API level 1

public AbsSeekBar ( Context context, AttributeSet attrs)

Added in API level 1

public AbsSeekBar ( Context context, AttributeSet attrs, int defStyle)

Added in API level 1

Public Methods

public int getKeyProgressIncrement ()

Added in API level 3

Returns the amount of progress changed via the arrow keys.

By default, this will be a value that is derived from the max progress.

Returns
  • The amount to increment or decrement when the user presses the arrow keys. This will be positive.

public Drawable getThumb ()

Return the drawable used to represent the scroll thumb - the component that the user can drag back and forth indicating the current value by its position.

Returns
  • The current thumb drawable

public int getThumbOffset ()

Added in API level 1

public void jumpDrawablesToCurrentState ()

Call Drawable.jumpToCurrentState() on all Drawable objects associated with this view.

public void onInitializeAccessibilityEvent ( AccessibilityEvent event)

Initializes an AccessibilityEvent with information about this View which is the event source. In other words, the source of an accessibility event is the view whose state change triggered firing the event.

Example: Setting the password property of an event in addition to properties set by the super implementation:

          public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
     super.onInitializeAccessibilityEvent(event);
     event.setPassword(true);
 }
         

If an View.AccessibilityDelegate has been specified via calling setAccessibilityDelegate(AccessibilityDelegate) its onInitializeAccessibilityEvent(View, AccessibilityEvent) is responsible for handling this call.

Note: Always call the super implementation before adding information to the event, in case the default implementation has basic information to add.

Parameters
event The event to initialize.

public void onInitializeAccessibilityNodeInfo ( AccessibilityNodeInfo info)

Parameters
info The instance to initialize.

public boolean onKeyDown (int keyCode, KeyEvent event)

Added in API level 1

Default implementation of KeyEvent.Callback.onKeyDown() : perform press of the view when KEYCODE_DPAD_CENTER or KEYCODE_ENTER is released, if the view is enabled and clickable.

Key presses in software keyboards will generally NOT trigger this listener, although some may elect to do so in some situations. Do not rely on this to catch software key presses.

Parameters
keyCode A key code that represents the button pressed, from KeyEvent .
event The KeyEvent object that defines the button action.
Returns
  • If you handled the event, return true. If you want to allow the event to be handled by the next receiver, return false.

public void onRtlPropertiesChanged (int layoutDirection)

Called when any RTL property (layout direction or text direction or text alignment) has been changed. Subclasses need to override this method to take care of cached information that depends on the resolved layout direction, or to inform child views that inherit their layout direction. The default implementation does nothing.

Parameters
layoutDirection the direction of the layout

public boolean onTouchEvent ( MotionEvent event)

Added in API level 1

Implement this method to handle touch screen motion events.

If this method is used to detect click actions, it is recommended that the actions be performed by implementing and calling performClick() . This will ensure consistent system behavior, including:

  • obeying click sound preferences
  • dispatching OnClickListener calls
  • handling ACTION_CLICK when accessibility features are enabled

Parameters
event The motion event.
Returns
  • True if the event was handled, false otherwise.

public boolean performAccessibilityAction (int action, Bundle arguments)

Performs the specified accessibility action on the view. For possible accessibility actions look at AccessibilityNodeInfo .

If an View.AccessibilityDelegate has been specified via calling setAccessibilityDelegate(AccessibilityDelegate) its performAccessibilityAction(View, int, Bundle) is responsible for handling this call.

Parameters
action The action to perform.
arguments Optional action arguments.
Returns
  • Whether the action was performed.

public void setKeyProgressIncrement (int increment)

Added in API level 3

Sets the amount of progress changed via the arrow keys.

Parameters
increment The amount to increment or decrement when the user presses the arrow keys.

public synchronized void setMax (int max)

Added in API level 1

Set the range of the progress bar to 0... max .

Parameters
max the upper range of this progress bar

public void setThumb ( Drawable thumb)

Added in API level 1

Sets the thumb that will be drawn at the end of the progress meter within the SeekBar.

If the thumb is a valid drawable (i.e. not null), half its width will be used as the new thumb offset (@see #setThumbOffset(int)).

Parameters
thumb Drawable representing the thumb

public void setThumbOffset (int thumbOffset)

Added in API level 1

Sets the thumb offset that allows the thumb to extend out of the range of the track.

Parameters
thumbOffset The offset amount in pixels.

Protected Methods

protected void drawableStateChanged ()

Added in API level 1

This function is called whenever the state of the view changes in such a way that it impacts the state of drawables being shown.

Be sure to call through to the superclass when overriding this function.

protected synchronized void onDraw ( Canvas canvas)

Added in API level 1

Implement this to do your drawing.

Parameters
canvas the canvas on which the background will be drawn

protected synchronized void onMeasure (int widthMeasureSpec, int heightMeasureSpec)

Added in API level 1

Measure the view and its content to determine the measured width and the measured height. This method is invoked by measure(int, int) and should be overriden by subclasses to provide accurate and efficient measurement of their contents.

CONTRACT: When overriding this method, you must call setMeasuredDimension(int, int) to store the measured width and height of this view. Failure to do so will trigger an IllegalStateException , thrown by measure(int, int) . Calling the superclass' onMeasure(int, int) is a valid use.

The base class implementation of measure defaults to the background size, unless a larger size is allowed by the MeasureSpec. Subclasses should override onMeasure(int, int) to provide better measurements of their content.

If this method is overridden, it is the subclass's responsibility to make sure the measured height and width are at least the view's minimum height and width ( getSuggestedMinimumHeight() and getSuggestedMinimumWidth() ).

Parameters
widthMeasureSpec horizontal space requirements as imposed by the parent. The requirements are encoded with View.MeasureSpec .
heightMeasureSpec vertical space requirements as imposed by the parent. The requirements are encoded with View.MeasureSpec .

protected void onSizeChanged (int w, int h, int oldw, int oldh)

Added in API level 1

This is called during layout when the size of this view has changed. If you were just added to the view hierarchy, you're called with the old values of 0.

Parameters
w Current width of this view.
h Current height of this view.
oldw Old width of this view.
oldh Old height of this view.

protected boolean verifyDrawable ( Drawable who)

Added in API level 1

If your view subclass is displaying its own Drawable objects, it should override this function and return true for any Drawable it is displaying. This allows animations for those drawables to be scheduled.

Be sure to call through to the super class when overriding this function.

Parameters
who The Drawable to verify. Return true if it is one you are displaying, else return the result of calling through to the super class.
Returns
  • boolean If true than the Drawable is being displayed in the view; else false and it is not allowed to animate.