Progressbar is the progress bar of Android. Experience
Source code download
The following describes progressbar in detail.
I. Description
In the progress of some operationsA visual indicator that shows you the progress of the operation,It also has a secondary progress bar to display the intermediate progress, such as the progress in the buffer area of streaming media playback.A progress bar cannot be determined.In uncertain mode, the progress bar displays a circular animation.This mode is often used in applications.ProgramThe length of a task is unknown.
Ii. Important XML attributes
Android: progressbarstyle: Default progress bar style
Android: progressbarstylehorizontal: horizontal style
Iii. Important Methods
Getmax():Returns the maximum range of the progress bar.
Getprogress(): Return the progress
Getsecondaryprogress(): Returns the secondary progress.
Incrementprogressby(INT diff): Specifies the increase progress.
Isindeterminate(): Indicates whether the progress bar is in uncertain mode.
Setindeterminate(Boolean indeterminate): sets the uncertain mode.
Setvisibility(Int v): sets whether the progress bar is visible.
4. Important Events
Onsizechanged(Int w, int H, int oldw, int oldh): this event is triggered when the progress value changes.
V. Instances
1. layout File
<? XML version = "1.0" encoding = "UTF-8"?>
Android: orientation = "vertical"
Android: layout_width = "match_parent"
Android: layout_height = "wrap_content">
style = "? Android: ATTR/progressbarstylehorizontal "
Android: layout_width = "200dip"
Android: layout_height = "wrap_content"
Android: max = "100"
Android: progress = "50"
Android: secondaryprogress = "75"/>
<Textview
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: text = "Default progress bar"/>
<Linearlayout
Android: Orientation = "horizontal"
Android: layout_width = "match_parent"
Android: layout_height = "wrap_content">
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: TEXT = "decrease"/>
<Button Android: Id = "@ + ID/increase"
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: text = "add"/>
</Linearlayout>
<Textview
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: text = "Custom progress bar"/>
<Linearlayout
Android: Orientation = "horizontal"
Android: layout_width = "match_parent"
Android: layout_height = "wrap_content">
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: TEXT = "second decrease"/>
<Button Android: Id = "@ + ID/increase_secondary"
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: text = "added second"/>
</Linearlayout>
</Linearlayout>
2. JavaCode
Package wjq. widgetdemo;
Import Android. App. activity;
Import Android. OS. Bundle;
Import Android. View. view;
Import Android. View. window;
Import Android. widget. Button;
Import Android. widget. progressbar;
Public class progressbardemo extends activity {
/* (Non-javadoc)
* @ See Android. App. Activity # oncreate (Android. OS. Bundle)
*/
@ Override
Protected void oncreate (bundle savedinstancestate ){
// Todo auto-generated method stub
Super. oncreate (savedinstancestate );
Requestwindowfeature (window. feature_progress );
Setcontentview (R. layout. probarpage );
Setprogressbarvisibility (true );
Final progressbar progresshorizontal = (progressbar) findviewbyid (R. Id. progress_horizontal );
Setprogress (progresshorizontal. getprogress () * 100 );
Setsecondaryprogress (progresshorizontal. getsecondaryprogress () * 100 );
Button button = (button) findviewbyid (R. Id. increase );
Button. setonclicklistener (New button. onclicklistener (){
Public void onclick (view v ){
Progresshorizontal. incrementprogressby (1 );
// Title progress is in range 0 .. 10000
Setprogress (100 * progresshorizontal. getprogress ());
}
});
Button = (button) findviewbyid (R. Id. Decrease );
Button. setonclicklistener (New button. onclicklistener (){
Public void onclick (view v ){
Progresshorizontal. incrementprogressby (-1 );
// Title progress is in range 0 .. 10000
Setprogress (100 * progresshorizontal. getprogress ());
}
});
Button = (button) findviewbyid (R. Id. increase_secondary );
Button. setonclicklistener (New button. onclicklistener (){
Public void onclick (view v ){
Progresshorizontal. incrementsecondaryprogressby (1 );
// Title progress is in range 0 .. 10000
Setsecondaryprogress (100 * progresshorizontal. getsecondaryprogress ());
}
});
Button = (button) findviewbyid (R. Id. decrease_secondary );
Button. setonclicklistener (New button. onclicklistener (){
Public void onclick (view v ){
Progresshorizontal. incrementsecondaryprogressby (-1 );
// Title progress is in range 0 .. 10000
Setsecondaryprogress (100 * progresshorizontal. getsecondaryprogress ());
}
});
}
}