Introduction to Android Alertdialog Usage Example Analysis _android

The example in this article is about Alertdialog, which is frequently encountered in this dialog box. Alertdialog is not the same as the dialog in WIN32 development, Alertdialog is non-blocking, and the Blocked dialog box is Popupwindow.

First, post a screenshot of the program's operation:

Main.xml's source code:

<?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"
  >

<button android:id= "@+id/button01" android:layout_height= "Wrap_content" android:text= "Layout dialog android:layout_width=" fill_parent "></Button>
<button android:id=" @+id /button02 "android:layout_height=" wrap_content "android:text= Layout Dialog" android:layout_width= "Fill_parent" > </button><view android:id= "@+id/view01" android:layout_width= wrap_content "android:layout_height=" Wrap_ Content "></View>

</LinearLayout>

The following figure is a non-layout dialog box, using Alertdialog directly

The following figure uses the Layout dialog box to customize the controls to implement more complex dialog boxes

Dialoglayout.xml's source code:

<?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=" wrap_content "
 android:o" rientation= "vertical" >
 <edittext android:layout_height= "wrap_content" android:layout_width= "Fill_"
 Parent "android:layout_marginleft=" 20dip "
 android:layout_marginright=" 20dip "android:textappearance="? Android:attr/textappearancemedium "android:id=" @+id/edtinput "/>
</LinearLayout>

Program Source:

Package com.testalertdialog;
Import android.app.Activity;
Import Android.app.AlertDialog;
Import Android.content.Context;
Import Android.content.DialogInterface;
Import Android.os.Bundle;
Import android.view.Gravity;
Import Android.view.LayoutInflater;
Import Android.view.View;
Import Android.view.View.OnClickListener;
Import Android.widget.Button;
Import Android.widget.EditText;


Import Android.widget.PopupWindow;
 public class Testalertdialog extends activity {Button btnshowdialog;
  Button btnshowdialog_layout; /** called the activity is a.
    * * @Override public void onCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);
    Setcontentview (R.layout.main);
    Define button btnshowdialog= (buttons) This.findviewbyid (R.id.button01);
    Btnshowdialog.setonclicklistener (New Clickevent ());
    btnshowdialog_layout= (Button) This.findviewbyid (R.ID.BUTTON02);
  Btnshowdialog_layout.setonclicklistener (New Clickevent ()); }//Unified handling key Event ClasS clickevent implements onclicklistener{@Override public void OnClick (View v) {//TODO auto-generated method s
    
   Tub if (v==btnshowdialog) ShowDialog (testalertdialog.this);
   
   else if (v==btnshowdialog_layout) showdialog_layout (testalertdialog.this); }//Show basic alertdialog private void ShowDialog (context context) {Alertdialog.builder Builder = new Alertdialog.bu
 Ilder (context);
 Builder.seticon (R.drawable.icon);
 Builder.settitle ("Title");
 Builder.setmessage ("message"); Builder.setpositivebutton ("Button1", new Dialoginterface.onclicklistener () {public void OnClick (Dialoginterface dial
   OG, int whichbutton) {settitle ("Clicked Button1 on Dialog box");
 }
  }); Builder.setneutralbutton ("Button2", new Dialoginterface.onclicklistener () {public void OnClick (Dialoginterface dialo
   g, int whichbutton) {settitle ("Clicked Button2 on Dialog box");
 }
  }); Builder.setnegativebutton ("Button3", new Dialoginterface.onclicklistener () {public void OnClick (DialogInterface dialog, int whichbutton) {settitle ("Clicked Button3 on Dialog box");
 }
  });
 Builder.show (); }//Display alertdialog private void showdialog_layout based on Layout (context context) {Layoutinflater Inflater = layoutinflate
 R.from (this);
 Final View Textentryview = inflater.inflate (r.layout.dialoglayout, NULL);
 Final EditText edtinput= (edittext) Textentryview.findviewbyid (r.id.edtinput);
 Final Alertdialog.builder Builder = new Alertdialog.builder (context);
 Builder.setcancelable (FALSE);
 Builder.seticon (R.drawable.icon);
 Builder.settitle ("Title");
 Builder.setview (Textentryview); Builder.setpositivebutton ("Confirm", new Dialoginterface.onclicklistener () {public void OnClick (Dialoginterface dialog, I
   NT Whichbutton) {Settitle (Edtinput.gettext ());
 }
  }); Builder.setnegativebutton ("Cancel", new Dialoginterface.onclicklistener () {public void OnClick (Dialoginterface dialog, I
   NT Whichbutton) {settitle ("");
 }
  });
 Builder.show (); }
}