Android: 以编程方式更改选项菜单项

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menu.xml

  <item
android:id="@+id/item1"
android:title="your Item">
</item>

put in your java file

  public void onPrepareOptionsMenu(Menu menu) {


menu.removeItem(R.id.item1);
}

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If I have to change the contents of my options menu I perform it during the onMenuOpened(). This allows me to check the running state at the very moment that the user is accessing the menu.

public boolean onMenuOpened(int featureid, Menu menu)
{
menu.clear();
if (!editable)
{
MenuItem itemAdd = menu.add(0, REASSIGN, Menu.NONE, context.getString(R.string.reassign));
MenuItem itemMod = menu.add(1, EDIT, Menu.NONE, context.getString(R.string.modify));
MenuItem itemDel = menu.add(2, DELETE, Menu.NONE, context.getString(R.string.delete));
itemAdd.setShortcut('0', 'a');
itemMod.setShortcut('1', 'm');
itemDel.setShortcut('2', 'd');
}
else
{
MenuItem itemSave = menu.add(3, SAVE, Menu.NONE, context.getString(R.string.savechanges));
itemSave.setShortcut('0', 'S');
}




return true;
}

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For anyone needs to change the options of the menu dynamically:

private Menu menu;


// ...


@Override
public boolean onCreateOptionsMenu(Menu menu)
{
this.menu = menu;
getMenuInflater().inflate(R.menu.options, menu);
return true;
}


// ...


private void hideOption(int id)
{
MenuItem item = menu.findItem(id);
item.setVisible(false);
}


private void showOption(int id)
{
MenuItem item = menu.findItem(id);
item.setVisible(true);
}


private void setOptionTitle(int id, String title)
{
MenuItem item = menu.findItem(id);
item.setTitle(title);
}


private void setOptionIcon(int id, int iconRes)
{
MenuItem item = menu.findItem(id);
item.setIcon(iconRes);
}

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Like Nikolay said do that in onPrepareOptionsMenu().

For menu items in the action bar you have to invalidate the menu with activity.invalidateOptionsMenu();

This is descriped in more detail here How can I refresh the ActionBar when onPrepareOptionsMenu switched menu entries?

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To disable certain items:

MenuItem item = menu.findItem(R.id.ID_ASSING_TO_THE_ITEM_IN_MENU_XML);
item.setEnabled(false);

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You can do something simple like I did. Just change the text to what is needed when the menu item is touched. I needed to turn the sound off and on, plus the ability to perform an action by touching it. Here is my code:

    @Override
public boolean onOptionsItemSelected(MenuItem item) {


switch (item.getItemId()) {
case R.id.audioOn:
audioOn = !audioOn;
if (audioOn)
item.setTitle("Audio Off");
else
item.setTitle("Audio On");
return true;


case R.id.touchOn:
touchOn = !touchOn;
if (touchOn)
item.setTitle("Touch Off");
else
item.setTitle("Touch On");
return true;
default:
return super.onOptionsItemSelected(item);
}
}

audioOn and touchOn are booleans checked in other parts of the code. Hope this helps.

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Try this code:

@Override
public boolean onPrepareOptionsMenu(Menu menu) {
this.menu=menu;
updateMenuItems(menu);
return super.onPrepareOptionsMenu(menu);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.document_list_activity_actions, menu);
return super.onCreateOptionsMenu(menu);
}




@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle presses on the action bar items
if (item.getItemId() == android.R.id.home) {
onHomeButtonPresssed();
}else if (item.getItemId() == R.id.action_delete) {
useCheckBoxAdapter=false;
deleteDocuments();
} else if (item.getItemId() == R.id.share) {
useCheckBoxAdapter=false;
shareDocuments();
} else if (item.getItemId() == R.id.action_tick) {
useCheckBoxAdapter=true;
onShowCheckboxes();
}
updateMenuItems(menu);
return true;
}


private void updateMenuItems(Menu menu){
if (useCheckBoxAdapter && menu != null) {
menu.findItem(R.id.action_delete).setVisible(true);
menu.findItem(R.id.share).setVisible(true);
menu.findItem(R.id.action_tick).setVisible(false);
} else {
menu.findItem(R.id.action_delete).setVisible(false);
menu.findItem(R.id.share).setVisible(false);
menu.findItem(R.id.action_tick).setVisible(true);
}
invalidateOptionsMenu();
}

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you can accomplish your task simply by implementing as below:

private Menu menu;


@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.drive_menu, menu);
return true;
}


@Override
public boolean onPrepareOptionsMenu(Menu menu) {
this.menu = menu;
return super.onPrepareOptionsMenu(menu);
}


@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();


if (id == R.id.action_toggle_grid) {
handleMenuOption(id);
return true;


} else if(id == R.id.action_toggle_list){
handleMenuOption(id);
return true;
}


return super.onOptionsItemSelected(item);
}


private void handleMenuOption(int id) {
MenuItem item = menu.findItem(id);
if (id == R.id.action_toggle_grid){
item.setVisible(false);
menu.findItem(R.id.action_toggle_list).setVisible(true);
}else if (id == R.id.action_toggle_list){
item.setVisible(false);
menu.findItem(R.id.action_toggle_grid).setVisible(true);
}
}

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using the following lines i have done to add the values in menu

getActivity().invalidateOptionsMenu();

try this work like a charm to me.

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In case you have a BottomBar:

@Override
public boolean onCreateOptionsMenu(Menu menu) {


if (mBottomBar.getCurrentTabId() == R.id.tab_more) {
getMenuInflater().inflate(R.menu.more_menu, menu);
}


return true;
}


@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.preferences:
startActivity(new Intent(this, PreferenceActivity.class));
break;
}


return super.onOptionsItemSelected(item);
}

Then you just need to call:

@Override
public void onBottomBarClick(int tabId) {
supportInvalidateOptionsMenu();
}

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Kotlin Code for accessing toolbar OptionsMenu items programmatically & change the text/icon ,..:

1-We have our menu item in menu items file like: menu.xml, sample code for this:

 <?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item android:id="@+id/balance"
android:title="0"
android:orderInCategory="100"
app:showAsAction="always" />
</menu>

2- Define a variable for accessing menu object in class :

var menu: Menu? = null

3- initial it in onCreateOptionsMenu :

override fun onCreateOptionsMenu(menu: Menu): Boolean {
// Inflate the menu; this adds items to the action bar if it is present.
menuInflater.inflate(R.menu.main, menu)
this.menu = menu
return true
}

4- Access the menu items inside your code or fun :

private fun initialBalanceMenuItemOnToolbar() {
var menuItemBalance = menu?.findItem(R.id.balance)
menuItemBalance?.title = Balance?.toString() ?: 0.toString()
// for change icon : menuWalletBalance?.icon
}

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@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.calendar, menu);
if(show_list == true) {


if(!locale.equalsIgnoreCase("sk")) menu.findItem(R.id.action_cyclesn).setVisible(false);


return true;
}