I understand how to create menu in Android. But what about the actions that they perform for each menu item? Do i have to specify them in each activity? or is there a "Android" way of doing this? I mean we can create a class and just refer to that class as it is Java but was thinking about "Android" way of doing it.
To be more clear, I create a menu in res/menu folder lets say standard_menu.xml and everything is looking good, but there is no accompanying java class file.
EDIT:
Ok I think i was not more clear. What I am trying to say is. Should I specify these actions for each menu item in EACH and EVERY activity that i use this menu?
Try like these. Implement these methods in your activity
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.your menu item id) {
//do some action
}
return super.onOptionsItemSelected(item);
}
following are the two functions that you have to override in your Activity :
#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_main, menu);
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_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
you will override these in each of your Activity .
every activity class have method onCreateOptionsMenu. if you want same menu for more then one activity simple write some inflant() method thats it & for override what you can do is call your own method from same class. thats it.
for Activity1
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
return MyClass.myMenuClick(item);
}
for Activity2
//same
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
return MyClass.myMenuClick(item);
}
MyClass {...
public static boolean myMenuClick(MenuItem item){
int id = item.getItemId();
if (id == R.id.your menu item id) {
//do some action
}
return super.onOptionsItemSelected(item);
}
}
NOTE
My class can be anything. if you want to create external public class then also it wont make any problem. but its good practice if it can be an internal class.
or just make public static method in your MainActivity.
Related
I am trying to hide the menu in the TableLayout with ViewPager I want the menu only in the solutions tab. I used the onPrepareOptionsmenu to hide the menu in tabs except the solutions tab. the thing is my onOptionsItemSelected is not working.
code:
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inf = getMenuInflater();
inf.inflate(R.menu.simpleadd,menu);
// +getMenuInflater().inflate(R.menu.simpleadd, menu);
onPrepareOptionsMenu(menu);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
if (viewpager.getCurrentItem()==0){
menu.findItem(R.id.simpleadd).setVisible(false);
} else if(viewpager.getCurrentItem()==1){
menu.findItem(R.id.simpleadd).setVisible(false);
} else if(viewpager.getCurrentItem()==2){
menu.findItem(R.id.simpleadd).setVisible(true);
} else if(viewpager.getCurrentItem()==3){
menu.findItem(R.id.simpleadd).setVisible(false);
}else if(viewpager.getCurrentItem()==4){
menu.findItem(R.id.simpleadd).setVisible(false);
}
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.simpleadd:
startActivity(new Intent(this,NewSolution.class));
}
return super.onOptionsItemSelected(item);
}
thanks in advance,
You have used the layout's name in the switch case of onOptionsItemSelected.
Use menu item's id instead.
First, you need to get item id and then set compare with layout ids,
this helps you to set the functionality. Please find the below sample
code for your reference.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.simpleadd) {
// execute your code here
}
return super.onOptionsItemSelected(item);
}
I use this for change the menu:
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_log_in, menu);
return true;
}
but...
If i want that my activity haven't menu, how make it?
I want make activities without menu because i don't have navigation in this scenes. How make it?
Remove these two methods in your Activity:
#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_del, menu);
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_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
I got a need to change the menu items dynamically during a click event of menu items.
So I implemented onOptionsItemSelected in an activity.
public class ResultActivity extends Activity {
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main_actions, menu);
return true;
}
}
and i'm calling invalidateOptionsMenu in the onOptionsItemSelected method which inturn should call the onPrepareOptionsMenu
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id){
case R.id.action_group: {
invalidateOptionsMenu();
break;
}
}
}
Also, I am trying to remove one item from menu in onPrepareOptionsMenu method.
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
Log.d(TAG,"In onPrepareOptionsMenu");
menu.removeItem(R.id.action_group);
Log.d(TAG,"Group icon is removed");
return super.onPrepareOptionsMenu(menu);
}
The problem is, item is deleted during the launch of activity rather than wait until corresponding menu item is clicked.
Can someone tell what the problem is.. TIA
The problem is that onPrepareOptionsMenu(Menu) gets called anyway, anytime your menu needs to be shown or reloaded. That includes calls coming from invalidateOptionsMenu(), but also from the Activity being created.
You could, for example, check for a boolean state before actually removing the item.
public boolean mRemoveItem;
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id){
case R.id.action_group: {
mRemoveItem = true;
invalidateOptionsMenu();
break;
}
}
}
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
if (mRemoveItem) {
menu.removeItem(R.id.action_group);
}
return super.onPrepareOptionsMenu(menu);
}
According to your needs, you will need to set mRemoveItem back to false at some point in your code.
When I created an activity it automatically added a back to main activity option in the action bar. It looks like those are the functions that do it:
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.app_settings, menu);
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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
Is there a way to make it go back using finish()? Right now it looks like it resets some values that are saved and I want to keep them. When I tried working with finish() it didn't do it but i'm not sure how to use it in the action bar.
This is simpler and it works perfect:
public class BackButtonExample extends Activity {
#SuppressLint("NewApi")
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.duahs);
ActionBar bar = getActionBar();
bar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#0B4C5F")));
bar.setDisplayHomeAsUpEnabled(true);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
this.finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
Try this
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId()==android.R.id.home {
finish();
return true; }
else{
return super.onOptionsItemSelected(item);
}
}
So I have menu items on action bar. on onOptionsItemSelected, I want to change the menu items images.
Here's my code
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle presses on the action bar items
switch (item.getItemId()) {
case R.id.todaySched:{
viewTodaySched();
item.setIcon(R.drawable.calendarselected);
infoLog=(MenuItem)findViewById(R.id.infoLog);
infoLog.setIcon(R.drawable.book);
return true;}
case R.id.infoLog:{
viewInfoLog();
item.setIcon(R.drawable.bookselected);
todaySched=(MenuItem)findViewById(R.id.todaySched);
todaySched.setIcon(R.drawable.calenderselected);
return true;}
default:
return super.onOptionsItemSelected(item);
}
}
But the icon won't change when I clicked it, and I got run time error.
e.g: When I click todaySched icon, It seems like I can't get the infoLog item id.
My LogCat: LogCat
As per you logcat, you getting class cast exception and you have used sharlockactionbar.
so try and check if you have imported the correct MenuItem and Menu which should like this:
import com.actionbarsherlock.view.MenuItem;
and
import com.actionbarsherlock.view.Menu;
instead of
import android.view.MenuItem;
and
import android.view.Menu;
Edit:
Here is how you can change both icons on just a single click:
private Menu menu;
private MenuItem item1, item2;
Boolean original = true;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getSupportMenuInflater().inflate(R.menu.menu, menu);
this.menu = menu;
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.todaySched) {
update();
} else if (id == R.id.infoLog) {
update();
}
return true;
}
private void update() {
item1 = menu.findItem(R.id.todaySched);
item2 = menu.findItem(R.id.infoLog);
if (original) {
item1.setIcon(getResources().getDrawable(
android.R.drawable.ic_menu_search));
item2.setIcon(getResources().getDrawable(
android.R.drawable.ic_menu_report_image));
original = false;
} else if (!original) {
item1.setIcon(getResources().getDrawable(
android.R.drawable.ic_menu_my_calendar));
item2.setIcon(getResources().getDrawable(
android.R.drawable.ic_menu_info_details));
original = true;
}
}
checked and is working. Now use it as per your requirement..
Cheers....
Every time you want to make changes to your items in the Action bar you have to call the function
invalidateOptionsMenu(). Then you override the method public boolean onPrepareOptionsMenu(Menu menu), there you get your menu items and you can set icons, create new actions or remove them. Hope it helps.