Android ProgressBar

 

Android ProgressBar Example

We can display the android progress bar dialog box to display the status of work being done e.g. downloading file, analyzing status of work etc.

In this example, we are displaying the progress dialog for dummy file download operation.

Here we are using android.app.ProgressDialog class to show the progress bar. Android ProgressDialog is the subclass of AlertDialog class.

The ProgressDialog class provides methods to work on progress bar like setProgress(), setMessage(), setProgressStyle(), setMax(), show() etc. The progress range of Progress Dialog is 0 to 10000.

Let's see a simple example to display progress bar in android.

1. ProgressDialog progressBar = new ProgressDialog(this);  
2. progressBar.setCancelable(true);//you can cancel it by pressing back button  
3. progressBar.setMessage("File downloading ...");  
4. progressBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);  
5. progressBar.setProgress(0);//initially progress is 0  
6. progressBar.setMax(100);//sets the maximum value 100  
7. progressBar.show();//displays the progress bar  

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Android Progress Bar Example by ProgressDialog

Let's see a simple example to create progress bar using ProgressDialog class.

activity_main.xml

Drag one button from the pallete, now the activity_main.xml file will look like this:

File: activity_main.xml

1. <RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android"  
2.     xmlns:tools="http://schemas.android.com/tools"  
3.     android:layout_width="match_parent"  
4.     android:layout_height="match_parent"  
5.     tools:context=".MainActivity" >  
6.   
7.     <Button  
8.         android:id="@+id/button1"  
9.         android:layout_width="wrap_content"  
10.         android:layout_height="wrap_content"  
11.         android:layout_alignParentTop="true"  
12.         android:layout_centerHorizontal="true"  
13.         android:layout_marginTop="116dp"  
14.         android:text="download file" />  
15.   
16. </RelativeLayout>  

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Activity class

Let's write the code to display the progress bar dialog box.

File: MainActivity.java

1. package example.javatpoint.com.progressbar;  
2.   
3. import android.app.ProgressDialog;  
4. import android.os.Handler;  
5. import android.support.v7.app.AppCompatActivity;  
6. import android.os.Bundle;  
7. import android.view.View;  
8. import android.widget.Button;  
9.   
10. public class MainActivity extends AppCompatActivity {  
11.     Button btnStartProgress;  
12.     ProgressDialog progressBar;  
13.     private int progressBarStatus = 0;  
14.     private Handler progressBarHandler = new Handler();  
15.     private long fileSize = 0;  
16.     @Override  
17.     protected void onCreate(Bundle savedInstanceState) {  
18.         super.onCreate(savedInstanceState);  
19.         setContentView(R.layout.activity_main);  
20.         addListenerOnButtonClick();  
21.     }  
22.     public void addListenerOnButtonClick() {  
23.         btnStartProgress = findViewById(R.id.button);  
24.         btnStartProgress.setOnClickListener(new View.OnClickListener(){  
25.   
26.             @Override  
27.             public void onClick(View v) {  
28.                 // creating progress bar dialog  
29.                 progressBar = new ProgressDialog(v.getContext());  
30.                 progressBar.setCancelable(true);  
31.                 progressBar.setMessage("File downloading ...");  
32.                 progressBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);  
33.                 progressBar.setProgress(0);  
34.                 progressBar.setMax(100);  
35.                 progressBar.show();  
36.                 //reset progress bar and filesize status  
37.                 progressBarStatus = 0;  
38.                 fileSize = 0;  
39.   
40.                 new Thread(new Runnable() {  
41.                     public void run() {  
42.                         while (progressBarStatus < 100) {  
43.                             // performing operation  
44.                             progressBarStatus = doOperation();  
45.                             try {  
46.                                 Thread.sleep(1000);  
47.                             } catch (InterruptedException e) {  
48.                                 e.printStackTrace();  
49.                             }  
50.                             // Updating the progress bar  
51.                             progressBarHandler.post(new Runnable() {  
52.                                 public void run() {  
53.                                     progressBar.setProgress(progressBarStatus);  
54.                                 }  
55.                             });  
56.                         }  
57.                         // performing operation if file is downloaded,  
58.                         if (progressBarStatus >= 100) {  
59.                             // sleeping for 1 second after operation completed  
60.                             try {  
61.                                 Thread.sleep(1000);  
62.                             } catch (InterruptedException e) {  
63.                                 e.printStackTrace();  
64.                             }  
65.                             // close the progress bar dialog  
66.                             progressBar.dismiss();  
67.                         }  
68.                     }  
69.                 }).start();  
70.             }//end of onClick method  
71.         });  
72.     }  
73.     // checking how much file is downloaded and updating the filesize  
74.     public int doOperation() {  
75.         //The range of ProgressDialog starts from 0 to 10000  
76.         while (fileSize <= 10000) {  
77.             fileSize++;  
78.             if (fileSize == 1000) {  
79.                 return 10;  
80.             } else if (fileSize == 2000) {  
81.                 return 20;  
82.             } else if (fileSize == 3000) {  
83.                 return 30;  
84.             } else if (fileSize == 4000) {  
85.                 return 40; // you can add more else if   
86.             }   
87.          /* else { 
88.                 return 100; 
89.             }*/  
90.         }//end of while  
91.             return 100;  
92.     }//end of doOperation  
93. }  

Output: