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");

	}

}

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 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　//onCreate(Bundle) 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();

	}

}