Android user interface-widget-progress bar

The progress bar of Android includes the dialog box progress bar, title progress bar, and horizontal progress bar.

1. Dialog progress bar

Procedure

1. overwrite the oncreatedialog () method of the activity and create a dialog box in it.

2. Call the showdialog () method of the activity to display the progress bar dialog box.

 

/Chapter04_ui_progressbar01/src/COM/Amaker/test/mainactivity. Java

Code

  Package  Com. Amaker. test;

  Import  Android. App. activity;
  Import  Android. App. Dialog;
 Import  Android. App. progressdialog;
  Import  Android. content. dialoginterface;
  Import  Android. OS. Bundle;
  Import  Android. View. view;
  Import  Android. View. View. onclicklistener;
  Import  Android. widget. Button;

  Public     Class Mainactivity  Extends  Activity {
  Private  Button mybtn;
@ Override
  Public     Void  Oncreate (bundle savedinstancestate ){
  Super  . Oncreate (savedinstancestate );
Setcontentview (R. layout. Main );
Mybtn  =  (Button) findviewbyid (R. Id. button01 );
Mybtn. setonclicklistener ( New  Onclicklistener (){
  Public     Void  Onclick (view v ){
Showdialog (  0  );
}
});
}

@ Override
  Protected  Dialog oncreatedialog (  Int  ID ){
Progressdialog Dialog  =    New  Progressdialog (  This  );
  //  The title is not displayed.  
  Dialog. settitle (  "  Test dialog box  "  );
Dialog. setindeterminate (  True  );
Dialog. setmessage (  " ProgramLoading... please wait!  "  );
Dialog. setcancelable (  True  );

Dialog. setbutton (dialog. button_positive,  "  OK  "  ,
  New  Dialoginterface. onclicklistener (){
@ Override
  Public     Void Onclick (dialoginterface dialog,  Int  Which ){
Dialog. Cancel ();
}
}
);

  Return  Dialog;
}
} 

 

Ii. Title Bar progress bar

1. Call the requestwindowfeatures () method of the activity to obtain the progress bar.

2. Call the setprogressbarindeterminatevisibility () method of the activity to display the progress bar dialog box.

 

/Chapter04_ui_progressbar02/src/COM/Amaker/test/mainactivity. Java

Code

 Package  Com. Amaker. test;

  Import  Android. App. activity;
  Import  Android. OS. Bundle;
  Import  Android. View. view;
  Import  Android. View. window;
  Import  Android. View. View. onclicklistener;
  Import  Android. widget. Button;

 Public     Class  Mainactivity  Extends  Activity {
  /**  Called when the activity is first created.  */  

  Private  Button B1, B2;

@ Override
  Public     Void Oncreate (bundle savedinstancestate ){
  Super  . Oncreate (savedinstancestate );

Requestwindowfeature (window. feature_indeterminate_progress );
Setcontentview (R. layout. Main );
B1  =  (Button) findviewbyid (R. Id. button01 );
B2  =  (Button) findviewbyid (R. Id. button02 );

B1.setonclicklistener (  New  Onclicklistener (){
  Public     Void Onclick (view v ){
Setprogressbarindeterminatevisibility (  True  );
}
});

B2.setonclicklistener (  New  Onclicklistener (){
  Public     Void  Onclick (view v ){
Setprogressbarindeterminatevisibility (  False  );
}
});
}
} 

 

3. Horizontal progress bar

Procedure

1. Declare progressbar in the layout file.

2. Obtain the progressbar instance in the activity.

3. Call the incrementprogressby () method of progressbar to increase or decrease the progress.

 

/Chapter04_ui_progressbar03/src/COM/Amaker/test/mainactivity. Java

Code

  Package  Com. Amaker. test;

  Import  Android. App. activity;
  Import  Android. OS. Bundle;
  Import  Android. View. view;
 Import  Android. View. View. onclicklistener;
  Import  Android. widget. Button;
  Import  Android. widget. progressbar;

  Public     Class  Mainactivity  Extends  Activity {
  Private  Button B1, B2;
Progressbar;
@ Override
 Public     Void  Oncreate (bundle savedinstancestate ){
  Super  . Oncreate (savedinstancestate );
Setcontentview (R. layout. Main );
B1  =  (Button) findviewbyid (R. Id. button01 );
B2  =  (Button) findviewbyid (R. Id. button02 );
Progressbar  =  (Progressbar) findviewbyid (R. Id. progressbar01 );

B1.setonclicklistener ( New  Onclicklistener (){
  Public     Void  Onclick (view v ){
Progressbar. incrementprogressby (  1  );
}
});

B2.setonclicklistener (  New  Onclicklistener (){
  Public     Void Onclick (view v ){
Progressbar. incrementprogressby (  -  1  );
}
});

}
} 

/Chapter04_ui_progressbar03/RES/layout/Main. xml

 

Code

  <?  XML version = "1.0" encoding = "UTF-8"  ?>  
  < Linearlayout  Xmlns: Android  = "Http://schemas.android.com/apk/res/android"  
Android: Orientation  = "Vertical"  
Android: layout_width  = "Fill_parent"  
Android: layout_height  = "Fill_parent"  
  >  
  <  Progressbar
 Android: ID  = "@ + ID/progressbar01"   
Style  = "? Android: ATTR/progressbarstylehorizontal"  
Android: layout_width  = "200dip"  
Android: layout_height  = "Wrap_content"  
Android: Max  = "100"  
Android: Progress  = "50"  
  > </ Progressbar  >  

  <  Button
  Android: ID  = "@ + ID/button01"   
Android: layout_width  = "Wrap_content"   
Android: layout_height  = "Wrap_content"   
Android: Text  = "Add"  > </  Button >  

  <  Button
  Android: ID  = "@ + ID/button02"   
Android: layout_width  = "Wrap_content"   
Android: layout_height  = "Wrap_content"   
Android: Text  = "Few"  > </  Button  >  

 </  Linearlayout  >