ProgressBar
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ProgressBar
extends View
Known Direct SubclassesKnown Indirect SubclassesClass Overview
Visual indicator of progress in some operation. Displays a bar to the user representing how far the operation has progressed; the application can change the amount of progress (modifying the length of the bar) as it moves forward. 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.
A progress bar can also be made indeterminate. In indeterminate mode, the progress bar shows a cyclic animation without an indication of progress. This mode is used by applications when the length of the task is unknown. The indeterminate progress bar can be either a spinning wheel or a horizontal bar.
The following code example shows how a progress bar can be used from a worker thread to update the user interface to notify the user of progress:
public class MyActivity extends Activity { private static final int PROGRESS = 0x1; private ProgressBar mProgress; private int mProgressStatus = 0; private Handler mHandler = new Handler(); protected void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.progressbar_activity); mProgress = (ProgressBar) findViewById(R.id.progress_bar); // Start lengthy operation in a background thread new Thread(new Runnable() { public void run() { while (mProgressStatus < 100) { mProgressStatus = doWork(); // Update the progress bar mHandler.post(new Runnable() { public void run() { mProgress.setProgress(mProgressStatus); } }); } } }).start(); } }
To add a progress bar to a layout file, you can use the <ProgressBar> element. By default, the progress bar is a spinning wheel (an indeterminate indicator). To change to a horizontal progress bar, apply theWidget.ProgressBar.Horizontal style, like so:
<ProgressBar style="@android:style/Widget.ProgressBar.Horizontal" ... />
If you will use the progress bar to show real progress, you must use the horizontal bar. You can then increment the progress withincrementProgressBy() orsetProgress(). By default, the progress bar is full when it reaches 100. If necessary, you can adjust the maximum value (the value for a full bar) using the android:max attribute. Other attributes available are listed below.
Another common style to apply to the progress bar is Widget.ProgressBar.Small, which shows a smaller version of the spinning wheel—useful when waiting for content to load. For example, you can insert this kind of progress bar into your default layout for a view that will be populated by some content fetched from the Internet—the spinning wheel appears immediately and when your application receives the content, it replaces the progress bar with the loaded content. For example:
<LinearLayout android:orientation="horizontal" ... > <ProgressBar android:layout_width="wrap_content" android:layout_height="wrap_content" style="@android:style/Widget.ProgressBar.Small" android:layout_marginRight="5dp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/loading" /> </LinearLayout>
Other progress bar styles provided by the system include:
Widget.ProgressBar.HorizontalWidget.ProgressBar.SmallWidget.ProgressBar.LargeWidget.ProgressBar.InverseWidget.ProgressBar.Small.InverseWidget.ProgressBar.Large.Inverse
The "inverse" styles provide an inverse color scheme for the spinner, which may be necessary if your application uses a light colored theme (a white background).
XML attributes
See ProgressBar Attributes,View Attributes
Summary
Must be an integer value, such as "100".
From classandroid.view.ViewFrom classandroid.view.ViewFrom classandroid.view.ViewGet the drawable used to draw the progress bar in indeterminate mode.
Return the upper limit of this progress bar's range.
Get the progress bar's current level of progress.
Get the drawable used to draw the progress bar in progress mode.
Get the progress bar's current level of secondary progress.
Increase the progress bar's progress by the specified amount.
Increase the progress bar's secondary progress by the specified amount.
Indicate whether this progress bar is in indeterminate mode.
Drawable.jumpToCurrentState() on all Drawable objects associated with this view.AccessibilityEvent with information about this View which is the event source.AccessibilityNodeInfo with information about this view.onSaveInstanceState().Cause an invalidate to happen on a subsequent cycle through the event loop.
Change the indeterminate mode for this progress bar.
Define the drawable used to draw the progress bar in indeterminate mode.
Set the range of the progress bar to 0...
Set the current progress to the specified value.
Define the drawable used to draw the progress bar in progress mode.
Set the current secondary progress to the specified value.
Measure the view and its content to determine the measured width and the measured height.
From class android.view.ViewFrom class java.lang.ObjectFrom interface android.graphics.drawable.Drawable.CallbackFrom interface android.view.KeyEvent.CallbackFrom interface android.view.accessibility.AccessibilityEventSourceXML Attributes
android:animationResolution
Timeout between frames of animation in milliseconds
Must be an integer value, such as "100".
This may also be a reference to a resource (in the form"@[package:]type:name") ortheme attribute (in the form"?[package:][type:]name")containing a value of this type.
This corresponds to the global attribute resource symbol animationResolution.
Related Methods
android:indeterminate
Allows to enable the indeterminate mode. In this mode the progress bar plays an infinite looping animation.
Must be a boolean value, either "true" or "false".
This may also be a reference to a resource (in the form"@[package:]type:name") ortheme attribute (in the form"?[package:][type:]name")containing a value of this type.
This corresponds to the global attribute resource symbol indeterminate.
Related Methods
android:indeterminateBehavior
Defines how the indeterminate mode should behave when the progress reaches max.
Must be one of the following constant values.
repeat1Progress starts over from 0.cycle2Progress keeps the current value and goes back to 0.This corresponds to the global attribute resource symbol indeterminateBehavior.
Related Methods
android:indeterminateDrawable
Drawable used for the indeterminate mode.
Must be a reference to another resource, in the form "@[+][package:]type:name"or to a theme attribute in the form "?[package:][type:]name".
This corresponds to the global attribute resource symbol indeterminateDrawable.
Related Methods
android:indeterminateDuration
Duration of the indeterminate animation.
Must be an integer value, such as "100".
This may also be a reference to a resource (in the form"@[package:]type:name") ortheme attribute (in the form"?[package:][type:]name")containing a value of this type.
This corresponds to the global attribute resource symbol indeterminateDuration.
Related Methods
android:indeterminateOnly
Restricts to ONLY indeterminate mode (state-keeping progress mode will not work).
Must be a boolean value, either "true" or "false".
This may also be a reference to a resource (in the form"@[package:]type:name") ortheme attribute (in the form"?[package:][type:]name")containing a value of this type.
This corresponds to the global attribute resource symbol indeterminateOnly.
Related Methods
android:interpolator
Related Methods
android:max
Defines the maximum value the progress can take.
Must be an integer value, such as "100".
This may also be a reference to a resource (in the form"@[package:]type:name") ortheme attribute (in the form"?[package:][type:]name")containing a value of this type.
This corresponds to the global attribute resource symbol max.
Related Methods
android:maxHeight
An optional argument to supply a maximum height for this view. See {see android.widget.ImageView#setMaxHeight} for details.
Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp".Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size),in (inches), mm (millimeters).
This may also be a reference to a resource (in the form"@[package:]type:name") ortheme attribute (in the form"?[package:][type:]name")containing a value of this type.
This corresponds to the global attribute resource symbol maxHeight.
Related Methods
android:maxWidth
An optional argument to supply a maximum width for this view. See {see android.widget.ImageView#setMaxWidth} for details.
Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp".Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size),in (inches), mm (millimeters).
This may also be a reference to a resource (in the form"@[package:]type:name") ortheme attribute (in the form"?[package:][type:]name")containing a value of this type.
This corresponds to the global attribute resource symbol maxWidth.
Related Methods
android:minHeight
Related Methods
android:minWidth
Related Methods
android:mirrorForRtl
Defines if the associated drawables need to be mirrored when in RTL mode. Default is false
Must be a boolean value, either "true" or "false".
This may also be a reference to a resource (in the form"@[package:]type:name") ortheme attribute (in the form"?[package:][type:]name")containing a value of this type.
This corresponds to the global attribute resource symbol mirrorForRtl.
Related Methods
android:progress
Defines the default progress value, between 0 and max.
Must be an integer value, such as "100".
This may also be a reference to a resource (in the form"@[package:]type:name") ortheme attribute (in the form"?[package:][type:]name")containing a value of this type.
This corresponds to the global attribute resource symbol progress.
Related Methods
android:progressDrawable
Drawable used for the progress mode.
Must be a reference to another resource, in the form "@[+][package:]type:name"or to a theme attribute in the form "?[package:][type:]name".
This corresponds to the global attribute resource symbol progressDrawable.
Related Methods
android:secondaryProgress
Defines the secondary progress value, between 0 and max. This progress is drawn between the primary progress and the background. It can be ideal for media scenarios such as showing the buffering progress while the default progress shows the play progress.
Must be an integer value, such as "100".
This may also be a reference to a resource (in the form"@[package:]type:name") ortheme attribute (in the form"?[package:][type:]name")containing a value of this type.
This corresponds to the global attribute resource symbol secondaryProgress.
Related Methods
Public Constructors
public ProgressBar(Context context)
Create a new progress bar with range 0...100 and initial progress of 0.
Parameters
public ProgressBar(Context context,AttributeSet attrs)
public ProgressBar(Context context,AttributeSet attrs, int defStyle)
Public Methods
public Drawable getIndeterminateDrawable ()
Get the drawable used to draw the progress bar in indeterminate mode.
Returns
- a
Drawableinstance
See Also
setIndeterminateDrawable(android.graphics.drawable.Drawable)setIndeterminate(boolean)
public Interpolator getInterpolator ()
Gets the acceleration curve type for the indeterminate animation.
Returns
- the
Interpolatorassociated to this animation
public synchronized int getMax ()
Return the upper limit of this progress bar's range.
Returns
- a positive integer
See Also
setMax(int)getProgress()getSecondaryProgress()
public synchronized int getProgress ()
Get the progress bar's current level of progress. Return 0 when the progress bar is in indeterminate mode.
Returns
- the current progress, between 0 and
getMax()
See Also
setIndeterminate(boolean)isIndeterminate()setProgress(int)setMax(int)getMax()
public Drawable getProgressDrawable ()
Get the drawable used to draw the progress bar in progress mode.
Returns
- a
Drawableinstance
See Also
setProgressDrawable(android.graphics.drawable.Drawable)setIndeterminate(boolean)
public synchronized int getSecondaryProgress ()
Get the progress bar's current level of secondary progress. Return 0 when the progress bar is in indeterminate mode.
Returns
- the current secondary progress, between 0 and
getMax()
See Also
setIndeterminate(boolean)isIndeterminate()setSecondaryProgress(int)setMax(int)getMax()
public final synchronized void incrementProgressBy (int diff)
Increase the progress bar's progress by the specified amount.
Parameters
See Also
setProgress(int)
public final synchronized void incrementSecondaryProgressBy (int diff)
Increase the progress bar's secondary progress by the specified amount.
Parameters
See Also
setSecondaryProgress(int)
public void invalidateDrawable(Drawable dr)
Invalidates the specified Drawable.
Parameters
public synchronized boolean isIndeterminate ()
Indicate whether this progress bar is in indeterminate mode.
Returns
- true if the progress bar is in indeterminate mode
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 callingsetAccessibilityDelegate(AccessibilityDelegate) itsonInitializeAccessibilityEvent(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
public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info)
Initializes an AccessibilityNodeInfo with information about this view. The base implementation sets:
setParent(View),setBoundsInParent(Rect),setBoundsInScreen(Rect),setPackageName(CharSequence),setClassName(CharSequence),setContentDescription(CharSequence),setEnabled(boolean),setClickable(boolean),setFocusable(boolean),setFocused(boolean),setLongClickable(boolean),setSelected(boolean),
Subclasses should override this method, call the super implementation, and set additional attributes.
If an View.AccessibilityDelegate has been specified via callingsetAccessibilityDelegate(AccessibilityDelegate) itsonInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo) is responsible for handling this call.
Parameters
public void onRestoreInstanceState(Parcelable state)
Hook allowing a view to re-apply a representation of its internal state that had previously been generated byonSaveInstanceState(). This function will never be called with a null state.
Parameters
onSaveInstanceState().public Parcelable onSaveInstanceState ()
Hook allowing a view to generate a representation of its internal state that can later be used to create a new instance with that same state. This state should only contain information that is not persistent or can not be reconstructed later. For example, you will never store your current position on screen because that will be computed again when a new instance of the view is placed in its view hierarchy.
Some examples of things you may store here: the current cursor position in a text view (but usually not the text itself since that is stored in a content provider or other persistent storage), the currently selected item in a list view.
Returns
- Returns a Parcelable object containing the view's current dynamic state, or null if there is nothing interesting to save. The default implementation returns null.
public void postInvalidate()
Cause an invalidate to happen on a subsequent cycle through the event loop. Use this to invalidate the View from a non-UI thread.
This method can be invoked from outside of the UI thread only when this View is attached to a window.
public synchronized void setIndeterminate (boolean indeterminate)
Change the indeterminate mode for this progress bar. In indeterminate mode, the progress is ignored and the progress bar shows an infinite animation instead.
If this progress bar's style only supports indeterminate mode (such as the circular progress bars), then this will be ignored.Parameters
public void setIndeterminateDrawable(Drawable d)
Define the drawable used to draw the progress bar in indeterminate mode.
Parameters
See Also
getIndeterminateDrawable()setIndeterminate(boolean)
public void setInterpolator(Context context, int resID)
Sets the acceleration curve for the indeterminate animation. The interpolator is loaded as a resource from the specified context.
Parameters
public void setInterpolator(Interpolator interpolator)
Sets the acceleration curve for the indeterminate animation. Defaults to a linear interpolation.
Parameters
public synchronized void setMax (int max)
Set the range of the progress bar to 0...max.
Parameters
See Also
getMax()setProgress(int)setSecondaryProgress(int)
public synchronized void setProgress (int progress)
Set the current progress to the specified value. Does not do anything if the progress bar is in indeterminate mode.
Parameters
getMax()See Also
setIndeterminate(boolean)isIndeterminate()getProgress()incrementProgressBy(int)
public void setProgressDrawable(Drawable d)
Define the drawable used to draw the progress bar in progress mode.
Parameters
See Also
getProgressDrawable()setIndeterminate(boolean)
public synchronized void setSecondaryProgress (int secondaryProgress)
Set the current secondary progress to the specified value. Does not do anything if the progress bar is in indeterminate mode.
Parameters
getMax()See Also
setIndeterminate(boolean)isIndeterminate()getSecondaryProgress()incrementSecondaryProgressBy(int)
public void setVisibility(int v)
Set the enabled state of this view.
Parameters
VISIBLE,INVISIBLE, orGONE.Protected Methods
protected 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.
Be sure to call through to the superclass when overriding this function.
protected void onAttachedToWindow()
This is called when the view is attached to a window. At this point it has a Surface and will start drawing. Note that this function is guaranteed to be called beforeonDraw(android.graphics.Canvas), however it may be called any time before the first onDraw -- including before or afteronMeasure(int, int).
protected void onDetachedFromWindow()
This is called when the view is detached from a window. At this point it no longer has a surface for drawing.
protected synchronized void onDraw (Canvas canvas)
Implement this to do your drawing.
Parameters
protected synchronized void onMeasure (int widthMeasureSpec, int heightMeasureSpec)
Measure the view and its content to determine the measured width and the measured height. This method is invoked bymeasure(int, int) and should be overriden by subclasses to provide accurate and efficient measurement of their contents.
CONTRACT: When overriding this method, you must callsetMeasuredDimension(int, int) to store the measured width and height of this view. Failure to do so will trigger anIllegalStateException, 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 overrideonMeasure(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
View.MeasureSpec.View.MeasureSpec.protected void onSizeChanged(int w, int h, int oldw, int oldh)
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
protected void onVisibilityChanged(View changedView, int visibility)
Called when the visibility of the view or an ancestor of the view is changed.
Parameters
VISIBLE,INVISIBLE orGONE.protected 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. This allows animations for those drawables to be scheduled.
Be sure to call through to the super class when overriding this function.
Parameters
Returns
- boolean If true than the Drawable is being displayed in the view; else false and it is not allowed to animate.
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