Android ProgressBar

Android ProgressBar Example

We can display the progress bar dialog box to display the status of work being done e.g. downloading file etc.
In this example, we are displaying the progress dialog for dummy file download.
The ProgressDialog class provides methods to work on progress bar like setProgress(), setMessage(), show() etc.

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activity_main.xml

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

File: activity_main.xml

 

<RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    tools:context=".MainActivity" >  
  
    <Button  
        android:id="@+id/button1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignParentTop="true"  
        android:layout_centerHorizontal="true"  
        android:layout_marginTop="116dp"  
        android:text="download file" />  
  
</RelativeLayout>  

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Activity class

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

File: MainActivity.java

 

package com.example.progressbar1;  
  
import android.app.Activity;  
import android.app.ProgressDialog;  
import android.os.Bundle;  
import android.os.Handler;  
import android.widget.Button;  
import android.view.Menu;  
import android.view.View;  
import android.view.View.OnClickListener;  
  
public class MainActivity extends Activity {  
    Button btnStartProgress;  
    ProgressDialog progressBar;  
    private int progressBarStatus = 0;  
    private Handler progressBarHandler = new Handler();  
    private long fileSize = 0;  
      
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        addListenerOnButtonClick();  
    }  
      
    public void addListenerOnButtonClick() {  
           
        btnStartProgress = (Button) findViewById(R.id.button1);  
        btnStartProgress.setOnClickListener(new OnClickListener(){  
   
           @Override  
           public void onClick(View v) {  
   
            // creating progress bar dialog  
            progressBar = new ProgressDialog(v.getContext());  
            progressBar.setCancelable(true);  
            progressBar.setMessage("File downloading ...");  
            progressBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);  
            progressBar.setProgress(0);  
            progressBar.setMax(100);  
            progressBar.show();  
   
            //reset progress bar and filesize status  
            progressBarStatus = 0;  
            fileSize = 0;  
   
            new Thread(new Runnable() {  
              public void run() {  
                while (progressBarStatus < 100) {  
   
                  // performing operation  
                  progressBarStatus = doOperation();  
   
                  try {  
                    Thread.sleep(1000);  
                  } catch (InterruptedException e) {  
                    e.printStackTrace();  
                  }  
   
                  // Updating the progress bar  
                  progressBarHandler.post(new Runnable() {  
                    public void run() {  
                      progressBar.setProgress(progressBarStatus);  
                    }  
                  });  
                }  
   
                // performing operation if file is downloaded,  
                if (progressBarStatus >= 100) {  
   
                    // sleeping for 1 second after operation completed  
                    try {  
                        Thread.sleep(1000);  
                    } catch (InterruptedException e) {e.printStackTrace();}  
   
                    // close the progress bar dialog  
                    progressBar.dismiss();  
                }  
              }  
             }).start();  
            }//end of onClick method  
          });  
         }  
   
    // checking how much file is downloaded and updating the filesize   
    public int doOperation() {  
        //The range of ProgressDialog starts from 0 to 10000  
        while (fileSize <= 10000) {  
            fileSize++;  
            if (fileSize == 1000) {  
                return 10;  
            } else if (fileSize == 2000) {  
                return 20;  
            } else if (fileSize == 3000) {  
                return 30;  
            } else if (fileSize == 4000) {  
            return 40;  
            } else if (fileSize == 5000) {  
                return 50;  
            } else if (fileSize == 6000) {  
                return 60;  
            }  
             else if (fileSize == 7000) {  
                    return 70;  
            }  
             else if (fileSize == 8000) {  
                    return 80;  
            }  
             else if (fileSize == 9000) {  
                    return 90;  
            }  
             else if (fileSize == 10000) {  
                    return 100;  
            }  
        }//end of while  
        return 100;  
    }//end of doOperation  
  
    @Override  
    public boolean onCreateOptionsMenu(Menu menu) {  
        // Inflate the menu; this adds items to the action bar if it is present.  
        getMenuInflater().inflate(R.menu.main, menu);  
        return true;  
    }  
}  

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