我可以将 ActionBar 菜单项之一设置为图标并将其显示为“showAsAction="always" 我得到的只是溢出菜单和按钮的标题而不是图标。我不明白什么我做错了吗？
这是活动中的代码：
public class RecipientsActivity extends ListActivity {
private static final String TAG = RecipientsActivity.class.getSimpleName();
protected List<ParseUser> mFriends;
protected ParseUser mCurrentUser;
protected MenuItem mSendMenuItem;
protected ParseRelation<ParseUser> mFriendsRelation;
@Override
protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recipients);
getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
getActionBar().setDisplayHomeAsUpEnabled(true);
}
@Override
public void onResume() {
super.onResume();
mCurrentUser = ParseUser.getCurrentUser();
mFriendsRelation = mCurrentUser.getRelation(ParseConstants.KEY_FRIENDS_RELATION);
setProgressBarIndeterminateVisibility(true);
ParseQuery<ParseUser> query = mFriendsRelation.getQuery();
query.addAscendingOrder(ParseConstants.KEY_USERNAME);
query.findInBackground(new FindCallback<ParseUser>() {
@Override
public void done(List<ParseUser> friends, ParseException e) {
setProgressBarIndeterminateVisibility(false);
if (e == null) {
mFriends = friends;
String[] friendNames = new String[mFriends.size()];
int i = 0;
for (ParseUser friend : mFriends) {
friendNames[i] = friend.getUsername();
i++;
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(RecipientsActivity.this,
android.R.layout.simple_list_item_checked,
friendNames);
setListAdapter(adapter);
} else {
Log.e(TAG, e.getMessage());
AlertDialog.Builder builder = new AlertDialog.Builder(getListView().getContext());
//e.getMesssage = says useful information about the error
builder.setMessage(e.getMessage());
builder.setTitle(R.string.error_title);
builder.setPositiveButton(android.R.string.ok, null);
AlertDialog dialog = builder.create();
dialog.show();
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_recipients, menu);
mSendMenuItem = menu.getItem(0);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_send) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
mSendMenuItem.setVisible(true);
}