private Dialog myDialog = null;

private void ExitLogin() {

        View view  = LayoutInflater.from(MainActivity.this).inflate(R.layout.activity_exit_dialog, null);

        Button btn_close = (Button) view.findViewById(R.id.btn_close);

        Button btn_ok = (Button) view.findViewById(R.id.btn_ok);

        ImageView img_close = (ImageView) view.findViewById(R.id.img_close);

        img_close.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                myDialog.dismiss();

            }

        });

        btn_close.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                myDialog.dismiss();

            }

        });

        btn_ok.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                myDialog.dismiss();

            }

        });

        myDialog = new Dialog(MainActivity.this, R.style.utils_dialog_loading_dialog_style);

        myDialog.setCancelable(false);

        myDialog.setContentView(view, new LinearLayout.LayoutParams(

                LinearLayout.LayoutParams.MATCH_PARENT,

                LinearLayout.LayoutParams.MATCH_PARENT));

        myDialog.show();

    }

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

     android:layout_width="wrap_content"

     android:layout_height="wrap_content"

     android:background="@drawable/bg_dialog"

     android:layout_centerHorizontal="true"

     android:layout_centerVertical="true" >

     <RelativeLayout

         android:layout_width="280dp"

         android:layout_height="wrap_content"

         android:orientation="vertical"

         android:id="@+id/pop_student"

         android:layout_centerVertical="true"

         android:layout_centerHorizontal="true">

         <TextView

             android:id="@+id/txt01"

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:textColor="@android:color/black"

             android:textSize="18sp"

             android:text="确定要退出吗？"

             android:layout_marginTop="50dp"

             android:layout_marginBottom="40dp"

             android:layout_alignParentTop="true"

             android:layout_centerHorizontal="true"

             />

         <LinearLayout

             android:id="@+id/layout_01"

             android:layout_below="@id/txt01"

             android:layout_width="match_parent"

             android:layout_height="wrap_content"

             android:orientation="horizontal" >

             <Button

                 android:id="@+id/btn_close"

                 android:layout_width="wrap_content"

                 android:layout_height="43dp"

                 android:layout_weight="1"

                 android:background="@drawable/bg_dialog_button_left"

                 android:gravity="center"

                 android:textColor="@android:color/black"

                 android:text="取消"

                 android:textSize="16sp" />

             <ImageView

                 android:id="@+id/img_line"

                 android:layout_width="0.5dp"

                 android:layout_height="43dp"

                 android:background="#c6c6c6" />

             <Button

                 android:id="@+id/btn_ok"

                 android:text="确认"

                 android:layout_width="wrap_content"

                 android:layout_height="43dp"

                 android:layout_weight="1"

                 android:background="@drawable/bg_dialog_button_right"

                 android:gravity="center"

                 android:textColor="@android:color/black"

                 android:textSize="16sp"

                 android:textStyle="bold" />

         </LinearLayout>

         <View

             android:layout_width="match_parent"

             android:layout_height="1dp"

             android:background="@color/hint"

             android:layout_alignTop="@+id/layout_01"

             android:layout_alignParentLeft="true"

             android:layout_alignParentStart="true" />

         <ImageView

             android:id="@+id/img_close"

             android:layout_marginTop="10dp"

             android:layout_marginRight="10dp"

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:src="@drawable/exit_dialog_close"

             android:layout_alignParentTop="true"

             android:layout_alignParentRight="true"

             android:layout_alignParentEnd="true" />

     </RelativeLayout>

 </RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item>

        <shape android:shape="rectangle">

            <solid android:color="#ffffff" />

            <corners android:bottomLeftRadius="30dp"

                android:bottomRightRadius="0dp"

                android:topLeftRadius="0dp"

                android:topRightRadius="0dp" />

            <padding android:top="10dp"

                android:bottom="10dp"

                android:left="30dp"

                android:right="30dp" />

        </shape>

    </item>

    <item android:state_pressed="true">

        <shape android:shape="rectangle">

            <solid android:color="@color/code09" />

            <corners android:bottomLeftRadius="30dp"

                android:bottomRightRadius="0dp"

                android:topLeftRadius="0dp"

                android:topRightRadius="0dp" />

            <padding android:top="10dp" android:bottom="10dp"

                android:left="30dp" android:right="30dp" />

        </shape>

    </item>

</selector>

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item>

        <shape android:shape="rectangle">

            <solid android:color="#ffffff" />

            <corners android:bottomLeftRadius="0dp" android:bottomRightRadius="30dp"

                android:topRightRadius="0dp" android:topLeftRadius="0dp"/>

            <padding android:right="25dp" android:left="25dp" android:top="10dp"

                android:bottom="10dp" />

        </shape>

    </item>

    <item android:state_pressed="true">

        <shape android:shape="rectangle">

            <solid android:color="@color/code09" />

            <padding android:bottom="10dp" android:top="10dp"

                android:left="25dp" android:right="25dp"/>

            <corners android:bottomLeftRadius="0dp" android:bottomRightRadius="30dp"

                android:topRightRadius="0dp" android:topLeftRadius="0dp"/>

        </shape>

    </item>

</selector>