Basic use of the progress bar control, and use of the progress bar Control

Basic use of the progress bar control, and use of the progress bar Control
Basic usage of the progress bar Control

I. Introduction

 

 

Ii. Method

1) usage of progress bar

1. Create the ProgressBar control in the layout file.

<ProgressBar
>

Click "add progress:

Click the reduce progress button:

 

Code:

Fry. Activity01

1 package fry; 2 3 import com. example. ex26ProgressBar. r; 4 5 import android. app. activity; 6 import android. OS. bundle; 7 import android. view. view; 8 import android. view. view. onClickListener; 9 import android. widget. button; 10 import android. widget. progressBar; 11 12 public class Activity01 extends Activity implements OnClickListener {13/* 14 * progress bar usage Method 15*1. Create the ssssbar control in the layout file 16*2. Point the ProgressBar object to the ProgressBar control 17*3. Use getProgress () of the ProgressBar object () and setProgress () method to modify the progress 18*19 */20 private Button btn_addProgress; 21 private Button btn_minusProgress; 22 private ProgressBar pb_progressBar1; 23 private int progress; 24 @ Override25 protected void onCreate (Bundle savedInstanceState) {26 27 // TODO Auto-generated method stub28 super. onCreate (savedInstanceState); 29 setContentView (R. layout. activity01); 30 31 btn_addProgress = (Button) findViewById (R. id. btn_addProgress); 32 btn_minusProgress = (Button) findViewById (R. id. btn_minusProgress); 33 pb_progressBar1 = (ProgressBar) findViewById (R. id. pb_progressBar1); 34 35 btn_addProgress.setOnClickListener (this); 36 btn_minusProgress.setOnClickListener (this); 37 38} 39 @ Override40 public void onClick (View v) {41 // TODO Auto-generated method stub42 switch (v. getId () {43 case R. id. btn_addProgress: 44 if (progress <= 100) {45 progress = pb_progressBar1.getProgress (); 46 progress ++ = (int) (100*0.2); 47 pb_progressBar1.setProgress (progress ); 48} else progress = 100; 49 50 break; 51 case R. id. btn_minusProgress: 52 if (progress> = 0) {53 progress = pb_progressBar1.getProgress (); 54 progress-= (int) (100*0.2); 55 pb_progressBar1.setProgress (progress ); 56} else progress = 0; 57 break; 58 59 default: 60 break; 61} 62} 63}

/Ex26ProgressBar/res/layout/activity01.xml

1 <? Xml version = "1.0" encoding = "UTF-8"?> 2 <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" 3 android: layout_width = "match_parent" 4 android: layout_height = "match_parent" 5 android: orientation = "vertical"> 6 7 <! -- Style: Set the control style --> 8 <! -- Use? To reference things --> 9 <ProgressBar 10 style = "? Android: attr/progressBarStyleSmall "11 android: layout_width =" wrap_content "12 android: layout_height =" wrap_content "13/> 14 15 <ProgressBar 16 style = "? Android: attr/progressBarStyleLarge "17 android: layout_width =" wrap_content "18 android: layout_height =" wrap_content "19/> 20 21 22 <ProgressBar 23 style = "? Android: attr/progressBarStyleLargeInverse "24 android: layout_width =" wrap_content "25 android: layout_height =" wrap_content "26/> 27 28 <ProgressBar 29 style = "? Android: attr/progressBarStyleHorizontal "30 android: layout_width =" match_parent "31 android: layout_height =" wrap_content "32 android: progress =" 30 "33/> 34 35 <ProgressBar 36 android: id = "@ + id/pb_progressBar1" 37 style = "? Android: attr/progressBarStyleHorizontal "38 android: layout_width =" match_parent "39 android: layout_height =" wrap_content "40 android: progress =" 50 "41 android: secondaryProgress = "80" 42 android: layout_marginTop = "30dp" 43/> 44 45 <LinearLayout 46 android: layout_width = "match_parent" 47 android: layout_height = "wrap_content" 48 android: orientation = "horizontal" 49> 50 <Button 51 android: id = "@ + id/btn_addProgress" 52 android: layout_width = "wrap_content" 53 android: layout_height = "wrap_content" 54 android: text = "Progress added" 55 android: layout_weight = "1" 56/> 57 58 <Button 59 android: id = "@ + id/btn_minusProgress" 60 android: layout_width = "wrap_content" 61 android: layout_height = "wrap_content" 62 android: text = "Progress reduction" 63 android: layout_weight = "1" 64/> 65 66 </LinearLayout> 67 68 69 </LinearLayout>

 

4. Notes

1. Use the getProgress () and setProgress () Methods of the ProgressBar object to modify the progress.

Progress = pb_progressBar1.getProgress ();
Progress + = (int) (100*0.2 );
Pb_progressBar1.setProgress (progress );

2. If you encounter unknown controls and properties, you can use the set and get methods to see how to use them.

 

V. easy to make mistakes