How to create a ProgressBar programmatically in Android

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="#d6e6de"     >     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Create ProgressBar"         />     <Button         android:id="@+id/btn_start"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Start Operation"         android:layout_toRightOf="@id/btn"         />     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_below="@id/btn_start"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.graphics.Color; import android.graphics.PorterDuff; 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; import android.widget.RelativeLayout.LayoutParams;   public class MainActivity extends Activity {     private int progressStatus = 0;     private Handler handler = new Handler();     ProgressBar pb;      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the widgets reference from XML layout         akibat RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         akibat Button btn = (Button) findViewById(R.id.btn);         akibat Button btn_start = (Button) findViewById(R.id.btn_start);         akibat TextView tv = (TextView) findViewById(R.id.tv);          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 //ProgressBar(Context context, AttributeSet attrs, int defStyleAttr)                 // Initialize a new Progressbar instance                 // Create a new progress kafe programmatically                 pb = new ProgressBar(getApplicationContext(), null, android.R.attr.progressBarStyleHorizontal);                  // Create new layout parameters for progress kafe                 LayoutParams lp = new LayoutParams(                         550, // Width in pixels                         LayoutParams.WRAP_CONTENT // Height of progress kafe                 );                  // Apply the layout parameters for progress kafe                 pb.setLayoutParams(lp);                  // Get the progress kafe layout parameters                 LayoutParams params = (LayoutParams) pb.getLayoutParams();                  // Set a layout position rule for progress kafe                 params.addRule(RelativeLayout.BELOW, tv.getId());                  // Apply the layout rule for progress kafe                 pb.setLayoutParams(params);                  // Set the progress kafe color                 pb.getProgressDrawable().setColorFilter(Color.BLUE, PorterDuff.Mode.SRC_IN);                  // Finally,  add the progress kafe to layout                 rl.addView(pb);             }         });          btn_start.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 // Set the progress status zero on each button click                 progressStatus = 0;                 // 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 kafe                             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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