[android-developers] how to start a activity using this menu structor

I am trying to add a about menu to my application and this is my menu
code

I get a error when i add this to the code

this.startActivity(intent("com.liquid.backgrounds.AboutDialog"));

so I can launch my AboutDialog.java

import android.view.Menu;
import android.view.MenuItem;

private static final int MENU_ABOUT = 0;

/* Creates the menu items */
@Override
public boolean onCreateOptionsMenu(Menu menu) {

menu.add(0, MENU_ABOUT, 0, "About");

return true;
}

public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case MENU_ABOUT:
Toast.makeText(this, "Please wait while the application loads",
Toast.LENGTH_LONG).show();

this.startActivity(intent("com.liquid.backgrounds.AboutDialog"));

return true;
return false;
}
}

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