官方关于Dialog的介绍

将Activity显示成Dialog的形式：

Tip: If you want a custom dialog, you can instead display an Activity as a dialog instead of using the Dialog APIs. Simply create an activity and set its theme to Theme.Holo.Dialog in the <activity> manifest element:

<activityandroid:theme="@android:style/Theme.Holo.Dialog">

That's it. The activity now displays in a dialog window instead of fullscreen.

将dialog的按钮点击事件传递给Activity:

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();
	}

}