android - Implementing buttons in AlertDialog -


when adding layout buttons alertdialog. doesnt show anything, force stops app. how implement set onclicklistener buttons in alertdialog. want show timepicker on button press 

         layoutinflater li = layoutinflater.from(this);         final view promptsview = li.inflate(r.layout.prompts, null);         alertdialog.builder alertdialogbuilder = new alertdialog.builder(this);         alertdialogbuilder.setview(promptsview);         final edittext userinput = (edittext) promptsview                 .findviewbyid(r.id.edittextdialoguserinput);          starttimebutton=(button)promptsview.findviewbyid(r.id.buttonstarttime);         stoptimebutton=(button)promptsview.findviewbyid(r.id.buttonstoptime);         starttimebutton.setonclicklistener(new view.onclicklistener() {             public void onclick(view v) {                 toast.maketext(getapplicationcontext(), "btn clocled", toast.length_long).show();                // showdialog(time_dialog_id);             }         });          stoptimebutton.setonclicklistener(new view.onclicklistener() {             public void onclick(view v) {                 toast.maketext(getapplicationcontext(), "btn clicled", toast.length_long).show();                // showdialog(time_dialog_id);             }         });          alertdialogbuilder.setcancelable(false).setpositivebutton("ok",                 new dialoginterface.onclicklistener()                 {             public void onclick(dialoginterface dialog,int which)             {                     final radiogroup radiogroup = (radiogroup)promptsview.findviewbyid(r.id.radiogroup1);                    int checkedradiobutton = 0;                    try {                        checkedradiobutton = radiogroup.getcheckedradiobuttonid();                    } catch (exception e) {                        e.printstacktrace();                    }                    int i=0;                    togglelogging(appsettings.getservicerunning(mainactivity.this),                         appsettings.setlogginginterval(mainactivity.this,currentintervalchoice));                  dialog.dismiss();                 // return;               }               });         // create alert dialog         alertdialog alertdialog = alertdialogbuilder.create();         // show         alertdialog.show();            this:               <button     android:id="@+id/buttonstarttime"     android:layout_width="wrap_content"     android:layout_height="30dp"     android:text="set start time" />  <textview     android:id="@+id/starttime"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="starttime"     android:textappearance="?android:attr/textappearancesmall" />  <button     android:id="@+id/buttonstoptime"     android:layout_width="wrap_content"     android:layout_height="30dp"     android:text="set stop time" />         

obj.setpositivebutton("ok", new dialoginterface.onclicklistener() {                 public void onclick(dialoginterface dialog, int id) {                     // if button clicked, close                  }             });

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