Android Progressbar

1. Add ProgressBar in res/layout/activity_main.xml

   <?xml version="1.0" encoding="utf-8"?>
   <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:orientation="vertical" >
   
       
   <ProgressBar
           android:id="@+id/progressBar1"
           style="?android:attr/progressBarStyleLarge"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_centerInParent="true"
           android:visibility="gone" />
   
       <Button
           android:id="@+id/btnShow"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="Show" />
   
       <Button
           android:id="@+id/btnHide"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_toRightOf="@id/btnShow"
           android:text="Hide" />
   
   </RelativeLayout>
   

2. Add code in src/your app package/MainActivity.java

   import android.app.Activity;
   import android.os.Bundle;
   import android.view.View;
   import android.view.View.OnClickListener;
   import android.widget.Button;
   import android.widget.ProgressBar;
   
   public class ProgressBarEx extends Activity{
   	Button btnShow,btnHide;
   	ProgressBar progressBar1;
   	@Override
   	protected void onCreate(Bundle savedInstanceState) {
   		super.onCreate(savedInstanceState);
   		setContentView(R.layout.progressbar_ex);
   		btnShow=(Button)findViewById(R.id.btnShow);
   		btnHide=(Button)findViewById(R.id.btnHide);
   		progressBar1=(ProgressBar)findViewById(R.id.progressBar1);
   		btnShow.setOnClickListener(new OnClickListener() {
   			@Override
   			public void onClick(View v) {
   				progressBar1.setVisibility(View.VISIBLE);
   			}
   		});
   		btnHide.setOnClickListener(new OnClickListener() {
   			@Override
   			public void onClick(View v) {
   				progressBar1.setVisibility(View.GONE);
   			}
   		});
   	}
   }