How Android writes a custom dialog can pop up in the title position

First on:

The layout of the title is:

<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android"    xmlns:tools= "http// Schemas.android.com/tools "    android:layout_width=" match_parent "    android:layout_height=" @dimen/title_ Height "    android:background=" @drawable/bg_top_title "   ><textview    android:layout_width=" Wrap_ Content "    android:layout_height=" wrap_content "    android:text=" Title "    android:textsize=" 20sp    " Android:layout_centerinparent= "true"/>    <imageview        android:layout_width= "@dimen/header_btn_ Width "        android:layout_height=" wrap_content "        android:layout_margintop=" 14DP "        android:layout_ Alignparenttop= "true"        android:paddingleft= "4DP"        android:id= "@+id/right_button"        android:src= "@ drawable/arrow_dropdown_pressed "        android:layout_alignparentright=" true "        /></relativelayout>

The layout of the dialog popup is

<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools= "http// Schemas.android.com/tools "android:layout_width=" fill_parent "android:layout_height=" fill_parent "android:id=" @+i D/dropdownbckgrnd "android:background=" @drawable/bg_pop_up_dimmer "> <imageview android:layout_width = "@dimen/header_btn_width" android:layout_height= "wrap_content" android:layout_margintop= "14DP" Andro Id:layout_alignparenttop= "true" android:paddingleft= "4DP" android:id= "@+id/right_button" android:src= "@drawable/arrow_dropdown_pressed" android:layout_alignparentright= "true"/> <linearlayout a        Ndroid:layout_width= "Fill_parent" android:layout_height= "wrap_content" android:layout_gravity= "center"        android:layout_marginleft= "12DP" android:layout_marginright= "12DP" android:layout_margintop= "35DP" android:orientation= "Vertical" Android: Focusable= "True" android:focusableintouchmode= "true" android:background= "@drawable/topmenu_popup_down" > <button android:layout_width= "fill_parent" android:layout_height= "45DP" Android            : background= "@drawable/main_menu_button_background" android:layout_margin= "@dimen/button_margin_top" android:text= "AAA"/> <button android:layout_width= "Fill_parent" Android:la yout_height= "45DP" android:background= "@drawable/main_menu_button_background" android:layout_margin= "@dimen/button_margin_top" android:text= "bbb"/> <button Android:layout_widt H= "Fill_parent" android:layout_height= "45DP" android:background= "@drawable/main_menu_button_backgrou nd "android:layout_margin=" @dimen/button_margin_top "android:text=" CCC "/> </lin Earlayout></relatiVelayout> 

We use

<span style= "White-space:pre" ></span>mdialog = new Dialog (context,r.style.customdialog);        Mdialog.setcontentview (r.layout.dialog_layout);

<style name= "Customdialog" parent= "@android: Style/theme.dialog" >        <item name= "Android:windownotitle" >true</item>//Set title        <item name= "Android:windowbackground" > @android: color/transparent</ Item>  //dialog should be transparent background        <item name= "android:windowisfloating" >false</item>  // Dialog is not suspended        <item name= "android:layoutanimation" > @null </item>  //dialog pop-up without animation    </ Style>

Then we'll set the other properties of dialog

        Mdialog = new Dialog (context,r.style.customdialog);        Mdialog.setcontentview (r.layout.dialog_layout);        Mdialog.setcanceledontouchoutside (TRUE);        Windowmanager.layoutparams params = Mdialog.getwindow (). GetAttributes ();        Params.gravity = gravity.top;//This setting causes the dialog to bounce from above params.windowanimations = 1;        WindowManager manager = (WindowManager) context.getsystemservice (Context.window_service);        Display display = Manager.getdefaultdisplay ();        Windowheight= display.getheight ();        Windowwidth= display.getwidth ();        Params.width = WindowWidth;        Params.height = WindowHeight; Mdialog.findviewbyid (R.id.right_button). Setonclicklistener (New View.onclicklistener () {@Override PU            Blic void OnClick (View v) {Mdialog.dismiss ();        }        });            Mdialog.findviewbyid (R.ID.DROPDOWNBCKGRND). Setonclicklistener (New View.onclicklistener () {@Override public void onClick (View v) {Mdialog.dismiss (); }        });