My Life with Android

My Life with Android

Introduction Android Componets UserInterface Advanced UI Data Storage Advanced Concepts Others New Studio

ProgressBar

Android ProgressBar

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.

Android Progress Bar Example by ProgressDialog

1. activity_main.xml

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>

2. Activity class

It displays the popup menu on button click.
File: MainActivity.java


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;  
    }  
}

OUTPUT :