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.

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

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

<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>

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;//you can add more else if
			} else{
				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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