Android Development Portal dialog box simple usage _android

This example describes the simple use of the Android Introduction dialog box. Share to everyone for your reference, specific as follows:

Note: This article is just a learning note to record where you have learned

1. Get alertdialog static internal Class Builder object, this class to create a dialog box
2. Setting the caption button of the dialog box and the event that the button responds to through the builder object
3. Invoke the Create () method of the Builder dialog box
4. Call Alertdialog Show () method to display the dialog box

Main.xml file

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android=
"http://schemas.android.com/apk/" Res/android "
  android:orientation=" vertical "
  android:layout_width=" fill_parent "
  android:layout_" height= "Fill_parent"
  >
<textview
  android:id= "@+id/mytextview" android:layout_width= "
  fill _parent "
  android:layout_height=" wrap_content "
  android:text=" @string/hello "
  />
<button
  android:id= "@+id/mybutton"
  android:layout_width= "fill_parent"
  android:layout_height= "WRAP_" Content "
  android:text=" Create alert dialog box
  />
</LinearLayout>

Mainactivity file

@Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);
    Setcontentview (R.layout.main);
    Mytextview = (TextView) Findviewbyid (R.id.mytextview);
    MyButton = (Button) Findviewbyid (R.id.mybutton);
    Add Alertdialog.builder object Final Alertdialog.builder Builder = new Alertdialog.builder (this); Adds a button event Mybutton.setonclicklistener (new View.onclicklistener () {@Override public void onclic for the button in the activity
      K (View v) {builder.settitle ("Are you sure you want to delete this message?"). Set OK button Setpositivebutton ("Yes", new Onclicklistener () {@Override public void OnClick (Dialog
        Interface dialog, int which) {mytextview.settext ("delete succeeded");
      }
      }). Set the Cancel button Setnegativebutton ("No", new Onclicklistener () {@Override public void OnClick (Dialogi
        Nterface dialog, int which) {Mytextview.settext ("cancel Delete");
       }
      });
        Create a dialog boxAlertdialog Alertdialog = Builder.create ();
    Display dialog box Alertdialog.show ();
  }
    });

 }
}

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I hope this article will help you with the Android program.