Introduction

This article explains how to use a Progress Bar.

Progress Bar

A Progress Bar is a graphical user interface that shows the progress of a task. Initially, the Progress Bar does not show the progress in the form of a percentage. But now a Progress Bar shows progress in the form of a percentage. There are two types of Progress Bars.
ProgressDialogue Style Spinner
ProgressDialogue Style Horizontal
ProgressDialogue Style_Spinner
11-290x300.jpg
ProgressDialogue Style_Horizontal
1.jpg
In this, you will use a button to start the progress bar in a click event. Inside the click event you will write this:
  1. progress = new ProgressDialog(v.getContext());
  2. progress.setMessage("Show Progress ...");
  3. progress.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
  4. progress.setProgress(0);
  5. progress.setMax(100);
  6. progress.show();
  7. progressStatus = 0;
  9. fileSize = 0;
  11. new Thread(new Runnable()
  12. {
  13. public void run() {
  14. while (progressStatus < 100) {
  16. progressStatus = doSomeTasks();
  18. try {
  19. Thread.sleep(1000);
  20. } catch (InterruptedException e) {
  21. e.printStackTrace();
  22. }
  23. progressBarHandler.post(new Runnable() {
  24. public void run() {
  25. progress.setProgress(progressStatus);
  26. }
  27. });
  28. }
  29. if (progressStatus >= 100) {
  30. try {
  31. Thread.sleep(2000);
  32. } catch (InterruptedException e)
  33. {
  34. e.printStackTrace();
  35. }
  36. progress.dismiss();
  37. }
  38. }
  39. }).start();
Step 1
Create an XML file and write this:
  1. <?xml version="1.0" encoding="utf-8"?>
  2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3. android:layout_width="fill_parent"
  4. android:layout_height="fill_parent"
  5. android:orientation="vertical" >
  7. <Button
  8. android:id="@+id/btnStartProgress"
  9. android:layout_width="wrap_content"
  10. android:layout_height="wrap_content"
  11. android:text="StartProgress" />
  13. </LinearLayout>
Step 2
Create a Java file and write this:
  1. package com.progress;
  3. import android.app.Activity;
  4. import android.app.ProgressDialog;
  5. import android.os.Bundle;
  6. import android.os.Handler;
  7. import android.widget.Button;
  8. import android.view.View;
  9. import android.view.View.OnClickListener;
  11. public class MainActivity extends Activity {
  13. Button btnshowprogress;
  14. ProgressDialog progress;
  15. private int progressStatus = 0;
  16. private Handler progressBarHandler = new Handler();
  18. private long fileSize = 0;
  20. @Override
  21. public void onCreate(Bundle savedInstanceState) {
  22. super.onCreate(savedInstanceState);
  23. setContentView(R.layout.activity_main);
  24. btnshowprogress = (Button) findViewById(R.id.btnStartProgress);
  25. btnshowprogress.setOnClickListener(
  26. new OnClickListener() {
  28. @Override
  29. public void onClick(View v) {
  31. // prepare for a progress bar dialog
  32. progress = new ProgressDialog(v.getContext());
  34. progress.setMessage("Show Progress ...");
  35. progress.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
  36. progress.setProgress(0);
  37. progress.setMax(100);
  38. progress.show();
  40. //reset progress bar status
  41. progressStatus = 0;
  43. //reset filesize
  44. fileSize = 0;
  46. new Thread(new Runnable() {
  47. public void run() {
  48. while (progressStatus < 100) {
  50. // process some tasks
  51. progressStatus = doSomeTasks();
  53. // your computer is too fast, sleep 1 second
  54. try {
  55. Thread.sleep(1000);
  56. } catch (InterruptedException e) {
  57. e.printStackTrace();
  58. }
  60. // Update the progress bar
  61. progressBarHandler.post(new Runnable() {
  62. public void run() {
  63. progress.setProgress(progressStatus);
  64. }
  65. });
  66. }
  68. // ok, file is downloaded,
  69. if (progressStatus >= 100) {
  71. // sleep 2 seconds, so that you can see the 100%
  72. try {
  73. Thread.sleep(2000);
  74. } catch (InterruptedException e) {
  75. e.printStackTrace();
  76. }
  78. // close the progress bar dialog
  79. progress.dismiss();
  80. }
  81. }
  82. }).start();
  84. }
  86. });
  88. }
  90. // file download simulator... a really simple
  91. public int doSomeTasks() {
  93. while (fileSize <= 1000000) {
  95. fileSize++;
  97. if (fileSize == 100000) {
  98. return 10;
  99. } else if (fileSize == 200000) {
  100. return 20;
  101. } else if (fileSize == 300000) {
  102. return 30;
  103. }
  104. // ...add your own
  106. }
  108. return 100;
  109. }
  110. }
Step 3
Clipboard04.jpg
Step 4
When you will click on a button:
Clipboard10.jpg