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 example.javatpoint.com.progressbar;
import android.app.ProgressDialog;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
    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 = findViewById(R.id.button);
        btnStartProgress.setOnClickListener(new View.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
}
Output:

android progress bar example output 1 android progress bar example output 2