Progress Bar In Android

<LinearLayout    android:layout_width="match_parent"    android:layout_height="match_parent"    
                    android:orientation="vertical"><Button        android:id="@+id/button3"        android:layout_width="wrap_content"        
                              android:layout_height="wrap_content"        android:onClick="ClickEvent"        
                              android:text="Show Progress Bar" /><ProgressBar        android:id="@+id/progressBar"        style="?android:attr/progressBarStyle"        
                     android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:visibility="gone" /><TextView            android:background="#00000000"            android:id="@+id/progressBarText" android:visibility="gone"            
                     android:layout_width="wrap_content"            android:layout_height="wrap_content"        
                     android:layout_alignLeft="@id/progressBar"        android:layout_alignTop="@id/progressBar"        
                     android:layout_alignRight="@id/progressBar"        android:layout_alignBottom="@id/progressBar"            
                     android:text="Please wait"/></LinearLayout>

public void ClickEvent(View view) {
  final ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar);
  final TextView textView = (TextView) findViewById(R.id.progressBarText);
  progressBar.setVisibility(View.VISIBLE);
  textView.setVisibility(View.VISIBLE);
  progressBar.postDelayed(new Runnable() {
    @Override
    public void run() {
      progressBar.setVisibility(View.GONE);
      textView.setVisibility(View.GONE);
    }
  }, 2000);
}

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