customdialog - Android Custom Dialog not Showing -

i want show simple custom dialog. starters wanted add text view , see if dialog show.

this xml:

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <textview android:id="@+id/tvpreview"  android:layout_height="wrap_content"  android:layout_width="wrap_content"  android:text="@string/instructions"></textview> </linearlayout> 

this code oncreatedialog function:

@override protected dialog oncreatedialog(int id) {     final dialog dialog = new dialog(this);     dialog.setcontentview(r.layout.predialog);     dialog.settitle("tests of dialog");     return dialog; } 

when user (me) presses menu item use code:

public void diagtests(){     showdialog(0); } 

what happens screen obscures dialog doesn't show.

does have idea of i'm doing wrong?

pd: in case there no errors or warnings of kind.

thanks help

you try approach. create custom dialog class (this example of class, can use want):

/** class must extends dialog */ /** implement onclicklistener dismiss dialog when ok button pressed */ public class dialogwithselect extends dialog implements onclicklistener {  private string _text; button okbutton; button cancelbutton; /**  * progressdialog shown during loading process  */ private              progressdialog            mydialog;  public dialogwithselect getdialog() {     return this; }  public string gettext() {     return this._text; }  public dialogwithselect(context context) {     super(context);      mydialog = new progressdialog(this.getcontext());      mydialog.setmessage("exporting file...");     /** 'window.feature_no_title' - used hide title */     requestwindowfeature(window.feature_no_title);     /** design dialog in main.xml file */     setcontentview(r.layout.dialog_with_select_box);       final spinner hubspinner = (spinner) findviewbyid(r.id.spinnerselectformat);      arrayadapter adapter = arrayadapter.createfromresource( this.getcontext(), r.array.spinner , android.r.layout.simple_spinner_item);       adapter.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item);      hubspinner.setadapter(adapter);       okbutton = (button) findviewbyid(r.id.okbutton);     cancelbutton = (button) findviewbyid(r.id.cancelbutton);        okbutton.setonclicklistener(new view.onclicklistener(){              public void onclick(view v) {             //whatever               }          });        cancelbutton.setonclicklistener(new view.onclicklistener(){          public void onclick(view v) {             //get text texstring paint on canvas             getdialog().hide();         }      } );   } 

define dialog on class going used:

final dialogwithselect dialog = new dialogwithselect(getcontext()); dialog.settitle(r.string.dialogselectboxtext); 

and launch in click event:

dialog.show();