Introduction to Android Development (i) detailed activities 1.4 Show normal dialog box

Sometimes, you may need to pop up a dialog box to get some confirmation from the user's input. In this case, you can override the protected method (protected) Oncreatedialog () in the activity base class.

1. Create a project: Dialog.

2. Code in the Main.xml.

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android=     
"http://schemas.android.com/apk/" Res/android " 
    android:layout_width=" fill_parent " 
    android:layout_height=" fill_parent " 
  
    android:o" rientation= "vertical" >     
             
<button     
    android:id= "@+id/btn_dialog" android:layout_width= "Fill_" 
    Parent "  
    android:layout_height=" wrap_content "android:text=" click to 
    Display a dialog " 
    Android:onclick = "OnClick"/>     
          
</LinearLayout>

3. Code in the Dialogactivity.java.

public class Dialogactivity extends activity {charsequence[] items = {"Google", "Apple", "Microsoft"};     
         
    boolean[] itemschecked = new Boolean[items.length]; /** called the activity is a.     
        * * @Override public void onCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);     
    Setcontentview (R.layout.main);     
    public void OnClick (View v) {showdialog (0);  @Override protected Dialog oncreatedialog (int id) {switch (ID) {case     
                    0:return New Alertdialog.builder (this). SetIcon (R.drawable.ic_launcher) . Settitle ("This are a dialog with some simple text ..."). Setpositivebutton ("OK" , new Dialoginterface.onclicklistener () {public voi D onClick (dialoginterface dialog, int whichbutton) { Toast.maketext (Getbasecontext (), "OK clicked!", toast.length     
                                _short). Show ();     
                            }). Setnegativebutton ("Cancel", New Dialoginterface.onclicklistener () {public void OnClick (Dialoginterface dialog , int whichbutton) {Toast.maketext (     
                                            Getbasecontext (), "Cancel clicked!",     
                                Toast.length_short). Show (); }). Setmultichoiceitems (iteMS, itemschecked, new Dialoginterface.onmultichoiceclicklistener () { public void OnClick (Dialoginterface dialog, int which, Boole     
                                            An ischecked) {Toast.maketext (     
                                                    Getbasecontext (), Items[which] + (ischecked?) 
                                                            "Checked!"     
         
                                : "unchecked!"), Toast.length_short). Show ();     
        ). Create ();     
    return null; }     
}