Save instance state for Menu Items in orientation changed

Last exercise demonstrate how to "Show and hide menu item programatically". But the setting will lose in orientation changed. This exercise show how to save the states in Bundle.

To save instance state, override onSaveInstanceState() method to put it in outState. Then retrieve it in onCreate(). And override onPrepareOptionsMenu() method to set Visible of menu items accordingly.

Modify MainActivity.java in last exercise.

package com.example.androidmenu;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.Toast;
import android.widget.ToggleButton;

public class MainActivity extends Activity {
 
 Menu menu;
 ToggleButton toggleButtonUp, toggleButtonDown;
 
 Boolean savedMenuUpIsVisible, savedMenuDownIsVisible;
 final static String KEY_Menu_Up = "KEY_MENU_UP";
 final static String KEY_Menu_Down = "KEY_MENU_DOWN";

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  toggleButtonUp = (ToggleButton)findViewById(R.id.buttonup);
  toggleButtonDown = (ToggleButton)findViewById(R.id.buttondown);
  
  toggleButtonUp.setOnCheckedChangeListener(new OnCheckedChangeListener(){

   @Override
   public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    
    if(menu != null){
     MenuItem item_up = menu.findItem(R.id.action_up);
     item_up.setVisible(isChecked);
    }
    
   }});
  
  toggleButtonDown.setOnCheckedChangeListener(new OnCheckedChangeListener(){

   @Override
   public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    
    if (menu != null){
     MenuItem item_down = menu.findItem(R.id.action_down);
     item_down.setVisible(isChecked);
    }
    
   }});
  
  if(savedInstanceState != null){
   savedMenuUpIsVisible = savedInstanceState.getBoolean(KEY_Menu_Up, true);
   savedMenuDownIsVisible = savedInstanceState.getBoolean(KEY_Menu_Down, true);
  }
  
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  this.menu = menu;
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  
  switch(item.getItemId()){
  case R.id.action_settings:
   Toast.makeText(getApplicationContext(), 
     "Setting...", 
     Toast.LENGTH_SHORT).show();
   break;
  case R.id.action_up:
   Toast.makeText(getApplicationContext(), 
     "Up...", 
     Toast.LENGTH_SHORT).show();
   break;
  case R.id.action_down:
   Toast.makeText(getApplicationContext(), 
     "Down...", 
     Toast.LENGTH_SHORT).show();
   break;
  case R.id.action_other:
   Toast.makeText(getApplicationContext(), 
     "Other...", 
     Toast.LENGTH_SHORT).show();
   break;
  default:
   Toast.makeText(getApplicationContext(), 
     "Unknown...", 
     Toast.LENGTH_SHORT).show();
   break;
  }
  
  //Return false to allow normal menu processing to proceed, 
  //true to consume it here.
  return false;
 }

 @Override
 public boolean onPrepareOptionsMenu(Menu menu) {
  
  if(savedMenuUpIsVisible != null){
   MenuItem item_up = menu.findItem(R.id.action_up);
   item_up.setVisible(savedMenuUpIsVisible);
  }
  
  if(savedMenuDownIsVisible != null){
   MenuItem item_down = menu.findItem(R.id.action_down);
   item_down.setVisible(savedMenuDownIsVisible);
  }

  return super.onPrepareOptionsMenu(menu);
 }

 @Override
 protected void onSaveInstanceState(Bundle outState) {
  super.onSaveInstanceState(outState);
  
  if (menu != null){
   MenuItem item_up = menu.findItem(R.id.action_up);
   outState.putBoolean(KEY_Menu_Up, item_up.isVisible());
   MenuItem item_down = menu.findItem(R.id.action_down);
   outState.putBoolean(KEY_Menu_Down, item_down.isVisible());
  }
  
 }

}

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