Android horizontal ProgressBar example

activity_main.xml 
 <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="10dp"     tools:context=".MainActivity"     android:background="#eff1f7"     >     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="0"         />     <!--         ProgressBar             Visual indicator of progress in some operation. Displays a kafetaria to the user             representing how far the operation has progressed; the application can change             the amount of progress (modifying the length of the bar) as it moves forward.     -->     <ProgressBar         android:id="@+id/pb"         android:layout_width="250dp"         android:layout_height="wrap_content"         android:layout_below="@id/tv"         style="@android:style/Widget.Holo.Light.ProgressBar.Horizontal"         />     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Start"         android:layout_below="@id/pb"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.os.Bundle; import android.app.Activity; import android.view.View; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.TextView; import android.widget.ProgressBar; import android.os.Handler;   public class MainActivity extends Activity {     private int progressStatus = 0;     private Handler handler = new Handler();      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the widgets reference from XML layout         simpulan RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         simpulan Button btn = (Button) findViewById(R.id.btn);         simpulan TextView tv = (TextView) findViewById(R.id.tv);         simpulan ProgressBar pb = (ProgressBar) findViewById(R.id.pb);          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 // Set the progress status zero on each button click                 progressStatus = 0;                  /*                     A Thread is a concurrent unit of execution. It has its own call stack for                     methods being invoked, their arguments and local variables. Each application                     has at least one thread running when it is started, the main thread,                     in the main ThreadGroup. The runtime keeps its own threads                     in the system thread group.                 */                 // Start the lengthy operation in a background thread                 new Thread(new Runnable() {                     @Override                     public void run() {                         while(progressStatus < 100){                             // Update the progress status                             progressStatus +=1;                              // Try to sleep the thread for 20 milliseconds                             try{                                 Thread.sleep(20);                             }catch(InterruptedException e){                                 e.printStackTrace();                             }                              // Update the progress kafetaria                             handler.post(new Runnable() {                                 @Override                                 public void run() {                                     pb.setProgress(progressStatus);                                     // Show the progress on TextView                                     tv.setText(progressStatus+"");                                 }                             });                         }                     }                 }).start(); // Start the operation            }         });     } }




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