Android Progress Bar Example

Open “res/layout/main.xml” file, just add normal button for demonstration.

File : res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
 
    <Button
        android:id="@+id/btnStartProgress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Download File" />
 
</LinearLayout>

File : MyAndroidAppActivity.java


package com.mkyong.android;
 
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;
 
public class MyAndroidAppActivity extends Activity {
 
 Button btnStartProgress;
 ProgressDialog progressBar;
 private int progressBarStatus = 0;
 private Handler progressBarHandler = new Handler();
 
 private long fileSize = 0;
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
 
  addListenerOnButton();
 
 }
 
 public void addListenerOnButton() {
 
  btnStartProgress = (Button) findViewById(R.id.btnStartProgress);
  btnStartProgress.setOnClickListener(
                 new OnClickListener() {
 
     @Override
     public void onClick(View v) {
 
   // prepare for a 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 status
   progressBarStatus = 0;
 
   //reset filesize
   fileSize = 0;
 
   new Thread(new Runnable() {
     public void run() {
    while (progressBarStatus < 100) {
 
      // process some tasks
      progressBarStatus = doSomeTasks();
 
      // your computer is too fast, sleep 1 second
      try {
     Thread.sleep(1000);
      } catch (InterruptedException e) {
     e.printStackTrace();
      }
 
      // Update the progress bar
      progressBarHandler.post(new Runnable() {
     public void run() {
       progressBar.setProgress(progressBarStatus);
     }
      });
    }
 
    // ok, file is downloaded,
    if (progressBarStatus >= 100) {
 
     // sleep 2 seconds, so that you can see the 100%
     try {
      Thread.sleep(2000);
     } catch (InterruptedException e) {
      e.printStackTrace();
     }
 
     // close the progress bar dialog
     progressBar.dismiss();
    }
     }
         }).start();
 
            }
 
                });
 
        }
 
 // file download simulator... a really simple
 public int doSomeTasks() {
 
  while (fileSize <= 1000000) {
 
   fileSize++;
 
   if (fileSize == 100000) {
    return 10;
   } else if (fileSize == 200000) {
    return 20;
   } else if (fileSize == 300000) {
    return 30;
   }
   // ...add your own
 
  }
 
  return 100;
 
 }
 
}


1. Result, a single button.



2. Click on the button, it will prompt a “progress bar dialog” to show the current download progress.



3. Task is completed, progress bar will show 100%, and close automatically.

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