| package com.example.android.apis.app; |
| |
| import com.example.android.apis.R; |
| |
| import android.app.Activity; |
| import android.app.Fragment; |
| import android.app.FragmentTransaction; |
| import android.os.Bundle; |
| import android.view.Menu; |
| import android.view.MenuInflater; |
| import android.view.View; |
| import android.view.View.OnClickListener; |
| import android.widget.CheckBox; |
| |
| /** |
| * Demonstrates how fragments can participate in the options menu. |
| */ |
| public class FragmentMenu extends Activity { |
| Fragment mFragment1; |
| Fragment mFragment2; |
| CheckBox mCheckBox1; |
| CheckBox mCheckBox2; |
| |
| // Update fragment visibility when check boxes are changed. |
| final OnClickListener mClickListener = new OnClickListener() { |
| public void onClick(View v) { |
| updateFragmentVisibility(); |
| } |
| }; |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(R.layout.fragment_menu); |
| |
| // Make sure the two menu fragments are created. |
| FragmentTransaction ft = openFragmentTransaction(); |
| mFragment1 = findFragmentByTag("f1"); |
| if (mFragment1 == null) { |
| mFragment1 = new MenuFragment(); |
| ft.add(mFragment1, "f1"); |
| } |
| mFragment2 = findFragmentByTag("f2"); |
| if (mFragment2 == null) { |
| mFragment2 = new Menu2Fragment(); |
| ft.add(mFragment2, "f2"); |
| } |
| ft.commit(); |
| |
| // Watch check box clicks. |
| mCheckBox1 = (CheckBox)findViewById(R.id.menu1); |
| mCheckBox1.setOnClickListener(mClickListener); |
| mCheckBox2 = (CheckBox)findViewById(R.id.menu2); |
| mCheckBox2.setOnClickListener(mClickListener); |
| |
| // Make sure fragments start out with correct visibility. |
| updateFragmentVisibility(); |
| } |
| |
| @Override |
| protected void onRestoreInstanceState(Bundle savedInstanceState) { |
| super.onRestoreInstanceState(savedInstanceState); |
| // Make sure fragments are updated after check box view state is restored. |
| updateFragmentVisibility(); |
| } |
| |
| // Update fragment visibility based on current check box state. |
| void updateFragmentVisibility() { |
| FragmentTransaction ft = openFragmentTransaction(); |
| if (mCheckBox1.isChecked()) ft.show(mFragment1); |
| else ft.hide(mFragment1); |
| if (mCheckBox2.isChecked()) ft.show(mFragment2); |
| else ft.hide(mFragment2); |
| ft.commit(); |
| } |
| |
| /** |
| * A fragment that displays a menu. This fragment happens to not |
| * have a UI (it does not implement onCreateView), but it could also |
| * have one if it wanted. |
| */ |
| public static class MenuFragment extends Fragment { |
| |
| @Override |
| public void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setHasOptionsMenu(true); |
| } |
| |
| @Override |
| public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { |
| menu.add("Menu 1a"); |
| menu.add("Menu 1b"); |
| } |
| } |
| |
| /** |
| * Second fragment with a menu. |
| */ |
| public static class Menu2Fragment extends Fragment { |
| |
| @Override |
| public void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setHasOptionsMenu(true); |
| } |
| |
| @Override |
| public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { |
| menu.add("Menu 2"); |
| } |
| } |
| } |