官方关于Dialog的介绍

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package
leihu.dialogtoactivity;

import android.annotation.SuppressLint;

import android.app.DialogFragment;

import android.os.Bundle;

import android.support.v4.app.FragmentActivity;

public class MainActivity extends
FragmentActivity  implements
NoticeDialogFragment.NoticeDialogListener{

    @Override

    protected
void onCreate(Bundle savedInstaceState) {

        super.onCreate(savedInstaceState);

        setContentView(R.layout.activity_main);

        showNoticeDialog();

    }

    @SuppressLint("NewApi")

    public
void showNoticeDialog(){

        DialogFragment dialog = new
NoticeDialogFragment();

        dialog.show(getFragmentManager(), "NoticeDialogFragment");

    }

    @Override

    public
void onDialogPositiveClick(DialogFragment dialog) {

        // TODO Auto-generated method stub

        System.out.println( "Positive button is pressed");

    }

    @Override

    public
void onDialogNegativeClick(DialogFragment dialog) {

        // TODO Auto-generated method stub

        System.out.println("Negative button is pressed");

    }

}

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package
leihu.dialogtoactivity;

import android.annotation.SuppressLint;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.Dialog;

import android.app.DialogFragment;

import android.content.DialogInterface;

import android.os.Bundle;

@SuppressLint("NewApi")

public
class NoticeDialogFragment extends
DialogFragment{

    public
interface NoticeDialogListener{

        public
void onDialogPositiveClick(DialogFragment dialog);

        @SuppressLint("NewApi")

        public
void onDialogNegativeClick(DialogFragment dialog);

    }

    NoticeDialogListener mListener;

    @SuppressLint("NewApi")

    @Override

    public
void onAttach(Activity activity) {    //Called when a fragment is first attached to its activity 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　//<code><a href="http://i.cnblogs.com/reference/android/app/Fragment.html#onCreate(android.os.Bundle)">onCreate(Bundle)</a></code> will be called after this.

        super.onAttach(activity);

        try
{

            mListener = (NoticeDialogListener) activity;

        } catch
(Exception e) {

            throw
new ClassCastException(activity.toString()

                    + " must implement NoticeDialogListener");

        }

    }

    @SuppressLint("NewApi")

    @Override

    public
Dialog onCreateDialog(Bundle savedInstanceState) {

        AlertDialog.Builder builder = new
AlertDialog.Builder(getActivity());

        builder.setMessage("fire missiles")

            .setPositiveButton("frie", new
DialogInterface.OnClickListener() {

                @Override

                public
void onClick(DialogInterface dialog, int
which) {

                    mListener.onDialogPositiveClick(NoticeDialogFragment.this);

                }

            })

             .setNegativeButton("cancel", new
DialogInterface.OnClickListener() {

                @Override

                public
void onClick(DialogInterface dialog, int
which) {

                    mListener.onDialogNegativeClick(NoticeDialogFragment.this);

                }

            });

        return
builder.create();

    }

}