protected Dialog onCreateDialog(int id) {

        // TODO Auto-generated method stub

        switch(id){

        case 10:

            return new AlertDialog.Builder(Activity13.this)

            .setTitle(getString(R.string.title)).setMessage(

                    getString(R.string.timeout)).setPositiveButton(

                    getString(R.string.ok),

                    new DialogInterface.OnClickListener() {

                        public void onClick(DialogInterface dialog,

                                int which) {

                        }

                    }).create();  

        }

        return super.onCreateDialog(id);

    }

showDialog(10);

 View  dialogView=(LinearLayout) getLayoutInflater().inflate(R.layout.dialog_addip,null);

        final AlertDialog.Builder builder =new AlertDialog.Builder(Demo12Activity.this);

        builder.setView(dialogView);

        showBtn = (Button)findViewById(R.id.show);

        showBtn.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View view) {

                                               //这

                builder.show();

            }

        });

<?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"

    android:gravity="center">

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="210dp"

        android:background="@drawable/radius_5dp"

        android:layout_marginLeft="12dp"

        android:layout_marginRight="12dp"

        android:padding="12dp"

        android:orientation="vertical">

        <TextView

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:gravity="center"

            android:layout_marginBottom="20dp"

            android:textColor="#f75830"

            android:textSize="18dp"

            android:text="添加ip"/>

    </LinearLayout>

</LinearLayout>