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
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.
int getThumbOffset()
boolean onKeyDown(int keyCode, KeyEvent event)
Default implementation of KeyEvent.Callback.onKeyMultiple(): perform press of the view when KEYCODE_DPAD_CENTER or KEYCODE_ENTER is released, if the view is enabled and clickable.
boolean onTouchEvent(MotionEvent event)
Implement this method to handle touch screen motion events.
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.
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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)

Since: API Level 1

public AbsSeekBar (Context context, AttributeSet attrs)

Since: API Level 1

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

Since: API Level 1

Public Methods

public int getKeyProgressIncrement ()

Since: 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 int getThumbOffset ()

Since: API Level 1

See Also

public boolean onKeyDown (int keyCode, KeyEvent event)

Since: API Level 1

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

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 boolean onTouchEvent (MotionEvent event)

Since: API Level 1

Implement this method to handle touch screen motion events.

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

public void setKeyProgressIncrement (int increment)

Since: 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)

Since: 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)

Since: 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)

Since: 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 ()

Since: 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)

Since: 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)

Since: 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)

Since: 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)

Since: 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.