public class DialogA extends DialogFragment implements DialogInterface.OnClickListener {

 @Override
 public Dialog onCreateDialog(Bundle savedInstanceState) {
  AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
  builder.setMessage(R.string.dialoga_title)
    .setPositiveButton(R.string.ok, this)
    .setNegativeButton(R.string.cancel, this);

  return builder.create();
 } 

 @Override
 public void onClick(DialogInterface dialog, int id) {
  switch(id) {
   case AlertDialog.BUTTON_NEGATIVE:
    Toast.makeText(getActivity(), "Negative", Toast.LENGTH_SHORT).show();
    break;
   case AlertDialog.BUTTON_POSITIVE:
    Toast.makeText(getActivity(), "Positive", Toast.LENGTH_SHORT).show();
    break;
   default:
    break;
  } 
 } 
}

public class DialogTest extends FragmentActivity {

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  showDialog();
 }

 private void showDialog() {
  FragmentManager fm = getSupportFragmentManager();
  DialogA dialoga = new DialogA();
  dialoga.show(fm, "fragmenta");
 }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical" >

 <TextView
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:hint="@string/dialoga_intro" />

 <ImageView
  android:id="@+id/image"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:src="@drawable/ic_action_video" />

</LinearLayout>

public class DialogA extends DialogFragment implements DialogInterface.OnClickListener {

 @Override
 public Dialog onCreateDialog(Bundle savedInstanceState) {
  AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
  LayoutInflater inflater = getActivity().getLayoutInflater();
  builder.setView(inflater.inflate(R.layout.dialoga, null))
    .setMessage(R.string.dialoga_title)
    .setPositiveButton(R.string.ok, this)
    .setNegativeButton(R.string.cancel, this);

  return builder.create();
 }

 @Override
 public void onClick(DialogInterface dialog, int id) {
  switch(id) {
   case AlertDialog.BUTTON_NEGATIVE:
    Toast.makeText(getActivity(), "Negative", Toast.LENGTH_SHORT).show();
    break;
   case AlertDialog.BUTTON_POSITIVE:
    Toast.makeText(getActivity(), "Positive", Toast.LENGTH_SHORT).show();
    break;
   default:
    break;
  }
 }
}

public interface NoticeDialogListener {
 public void onDialogPositiveClick(DialogFragment dialog);
 public void onDialogNegativeClick(DialogFragment dialog);
} 

// Use this instance of the interface to deliver action events
NoticeDialogListener mListener;

// Override the Fragment.onAttach() method to instantiate the NoticeDialogListener
@Override
public void onAttach(Activity activity) {
 super.onAttach(activity);
 // Verify that the host activity implements the callback interface
 try {
  // Instantiate the NoticeDialogListener so we can send events to the host
  mListener = (NoticeDialogListener) activity;
 } catch (ClassCastException e) {
  // The activity doesn't implement the interface, throw exception
  throw new ClassCastException(activity.toString()
    + " must implement NoticeDialogListener");
 } 
} 

@Override
public void onClick(DialogInterface dialog, int id) {
 switch(id) {
  case AlertDialog.BUTTON_POSITIVE:
   //Toast.makeText(getActivity(), "Negative", Toast.LENGTH_SHORT).show();
   mListener.onDialogPositiveClick(DialogA.this);
   break;
  case AlertDialog.BUTTON_NEGATIVE:
   //Toast.makeText(getActivity(), "Positive", Toast.LENGTH_SHORT).show();
   mListener.onDialogNegativeClick(DialogA.this);
   break;
  default:
   break;
 } 
}

public class DialogTest extends FragmentActivity 
 implements DialogA.NoticeDialogListener {

 ...

 @Override
 public void onDialogPositiveClick(DialogFragment dialog) {
  Toast.makeText(this, "Positive Callback", Toast.LENGTH_SHORT).show();
 }
 @Override
 public void onDialogNegativeClick(DialogFragment dialog) {
  Toast.makeText(this, "Negative Callback", Toast.LENGTH_SHORT).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:orientation="vertical" >
 
 <ImageView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:src="@drawable/ic_launcher" />
 
</LinearLayout>

public class MainActivity extends Activity {
 private Button clk;
 private Dialog dialog;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
   
  clk = (Button) findViewById(R.id.clk);
  dialog = new Dialog(this);
  dialog.setContentView(R.layout.dialog);
  clk.setOnClickListener(new OnClickListener() {
    
   @Override
   public void onClick(View v) {
    dialog.show();
   }
  });
 }
}

public class MainActivity extends Activity {
 private Button clk;
 private Dialog dialog;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
   
  clk = (Button) findViewById(R.id.clk);
  dialog = new Dialog(this);
  dialog.setContentView(R.layout.dialog);
  clk.setOnClickListener(new OnClickListener() {
    
   @Override
   public void onClick(View v) {
    dialog.show();
   }
  });
 
  //用户恢复对话框的状态
  if(savedInstanceState != null && savedInstanceState.getBoolean("dialog_show"))
   clk.performClick();
 }
 
 /**
  * 用于保存对话框的状态以便恢复
  */
 @Override
 protected void onSaveInstanceState(Bundle outState) {
  super.onSaveInstanceState(outState);
  if(dialog != null && dialog.isShowing())
   outState.putBoolean("dialog_show", true);
  else
   outState.putBoolean("dialog_show", false);
 }
 
 /**
  * 在Activity销毁之前，确保对话框以关闭
  */
 @Override
 protected void onDestroy() {
  super.onDestroy();
  if(dialog != null && dialog.isShowing())
   dialog.dismiss();
 }
}

public class MyDialogFragment extends DialogFragment {
 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
   Bundle savedInstanceState) {
  View v = inflater.inflate(R.layout.dialog, container, false);
  return v;
 }
}

public class MainActivity extends FragmentActivity {
 private Button clk;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
   
  clk = (Button) findViewById(R.id.clk);
  clk.setOnClickListener(new OnClickListener() {
    
   @Override
   public void onClick(View v) {
    MyDialogFragment mdf = new MyDialogFragment();
    FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
    ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
    mdf.show(ft, "df");
   }
  });
 }
}