Double back to close application

Java

      
    
    boolean singleBack = false;

@Override
public void onBackPressed() {
   if (singleBack) {
    super.onBackPressed();
    return;
   }

   this.singleBack = true;
   Toast.makeText(this, "Double Back to exit", Toast.LENGTH_SHORT).show();

   new Handler().postDelayed(new Runnable() {

      @Override
      public void run() {
          singleBack=false;                       
      }
   }, 2000);
} 
    
        
        
 

For WebView

Java

      
    private boolean doubleBackToExitPressedOnce;


    @Override
    public void onBackPressed() {
        if (webView.canGoBack()) {
            webView.goBack();
        } else {
            if (doubleBackToExitPressedOnce) {
                super.onBackPressed();
                return;
            }

            this.doubleBackToExitPressedOnce = true;
            Toast.makeText(this, "Press back again to exit", Toast.LENGTH_SHORT).show();

            new Handler().postDelayed(new Runnable() {
                @Override
                public void run() {
                    doubleBackToExitPressedOnce = false;
                }
            }, 2000); // Time interval for the double back press (2 seconds in this example)
        }
    }