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Up Navigation - Return to launching activity

I have an activity up-navigation enabled, so I have the android:parentActivityName set. This works.
However, I want my AppPreferencesActivity to be accessed from different parent activities. I'd like to have my up-action return to the activity that launched it. Removing the parentActivityName attribute removes the up action completely.
How can I configure the application so that Up Navigation returns me to the activity that launched my AppPreferencesActivity?
<activity
android:name="org.me.AppPreferencesActivity"
android:label="#string/title_activity_preferences"
android:parentActivityName="org.me.MainActivity">
</activity>

First, I removed the parentActivityNameAttribute.
Then, in my AppPrefernecesActivity, I added this to the creation portion:
getActionBar().setDisplayHomeAsUpEnabled(true);
THen, defined a case for handling the "home" action.
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case android.R.id.home:
finish();
return true;
default:
return false;
}
}
This works, but is there a better way? This seems a bit hackish.

Changing options menu icon in bottomNavigationView depending on an open Fragment

Option Menu:
<item
android:id="#+id/home"
android:icon="#drawable/ic_home"
android:title="Home"/>
<item
android:id="#+id/companies"
android:icon="#drawable/ic_companies"
android:title="Companies"/>
<item
android:id="#+id/contact"
android:icon="#drawable/ic_contacts"
android:title="Contact"/>
I want to change this item's icon programmatically depending on the open Fragment and, obviously, have different actions when the user hits this button. I tried several things to do that, but nothing worked.
The last thing I tried was this code in my Fragment onCreateView method:
Menu menu = bottomNavigationView.getMenu();
menu.findItem(R.id.ic_home).setIcon(R.drawable.ic_home_fill);
but its not work for me.
what i tried in selectFragment(MenuItem item)
switch (item.getItemId()) {
case R.id.home:
item.setIcon(R.id.ic_home_fill);
break;
}
I want to change the icon of the bottom navigation of selected position. if user clicked one item then the icon change to another one and when i select another one then 1st icon can set as a default.
refer this link:Android: Bottom Navigation View - change icon of selected item
but it's not work for me
plz give me a other solution.
Thank you

Try this, It worked for me
BottomNavigationView mBottomNavigationView = (BottomNavigationView) findViewById(R.id.bottom_nav);
mBottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem item) {
invalidateOptionsMenu();
switch (item.getItemId()) {
case R.id.click_to_use:
addHomeFragment(MainActivity.this);
mTitle.setText("Home");
item.setIcon(R.drawable.device);
break;
case R.id.history:
addNotifyFragment(MainActivity.this);
mTitle.setText("History");
item.setIcon(R.drawable.ios_icon);
break;
case R.id.settings:
addSettingFragment(MainActivity.this);
mTitle.setText("Settings");
break;
}
return true;
}
});

after any modification in the menu, you would have to make an "Invalidateoptionsmenu ()" in the action. I invite you to want to test this feature . see here

Start an Activity from Item (ActionBar)?

I'm using ActionBarCompat to make an actionbar for devices under API 11.
It works great and was easy to setup, but I'm stuck.
I have some items on the Actionbar, and it looks great.
Some Items are behind the three dots (ifRoom) and some you always can see.
How do I make so when you click on one of these items so it starts an new Activity?
I tried with switch/case and other methods, but didnt work to send from one Activity to another through the Items. I know how to send from button, imagebutton to another Activity, but not from Items.
My main.xml looks like this:
<item
android:id="#+id/add"
android:title="Lägg till"
android:icon="#drawable/new"
android:orderInCategory="1"
budsnabben:showAsAction="always"/>
And the code in MainActivity looks like this:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()) {
case R.id.:
Intent intent = new Intent(this, MapActivity.class);
this.startActivity(intent);
break;
case R.id.menu_item2:
// another startActivity, this is for item with id "menu_item2"
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}
}
The problem is on case R.id.... After Id, I dont get my class map or main, its not there.
Thank you.
SOLUTION:
Just want to thank you Gerard.
I created new Strings in strings.xml.
After that, I did change the title in my main.xml to this:
android:title="#string/add"
I did hard-coded that line like before, therefore it didn't work I think:
android:title="#+id/add"
Thank you once more.

Use public boolean onOptionsItemSelected(MenuItem item) { ... } in your activity using the actionbar and create a switch-case matching item.getItemId() with the IDs from the menu layout. After that creating the appropriate intent like you would on a regular button.

"Back" button on Action bar - Android . How to go "back"?

Action Bar
I'm talking about the (Number 1, in the pic), button with a little arrow and the app icon and the top left side of the screen. It is automatically defined when we select the "Black activity" template.
My app has a pretty huge hierarchy graph, got about 25 activities now.
I'm basically just showing a few tutorials and one can navigate to it according to the categories.
Now that "Back" (?) button thingy on action bar is on every screen I have, and I do want to keep it. The code shows no error, but when I actually press that button, the app stops working.
What I want, is to just replicate the actual back button function with that (Number 1) button, that I showed in the image.
When I press it, the top most screen should close, and the last one should open. Just close the screen.
What I tried :
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
this is the the function that inflates that buggy button along with the action bar. I tried to replace the entire code, and call "Finish" function, but that failed miserably.
I was unable to find a function specifically made for that top left most button...
I want the top most screen on the stack(the one in the foreground) to close, when this button is touched.
How to do this ?

I think the easiest way out is follows:
I am assuming that from activity A you are starting the activity B. Now from activity B you want to go back to activity A on pressing the top left back button on action bar. simply call this.finish() or ActivityName.this.finish() from there:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
this.finish();
return true;
}
return super.onOptionsItemSelected(item);
}
This should finish your current activity. However if you have lot of activities, then you might have to do this in all the activities. To save yourself from that effort, you can make a class lets call it AbstractActivity; that extends Activity. Then you can extend all your other activity classes to extend that class(AbstractActivity). Inside AbstractActivity you can put the above code. So now that piece of code would be valid for all your activities and that feature would be implemented for all of them. Basically this sort of thing (Inheritance)can be used any time, when there are some common features which would be applicable to your many classes.
If you are receiving any errors, please do post your LogCat if you require further help.
Hope this helps you.

just giving basic code given by #shobhit puri...
for invoking the action bar back button..add the following code in the onCreate() method along with the onOptionsItemSelected....
protected void onCreate(Bundle savedInstanceState)
{
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_information);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
this.finish();
return true;
}
return super.onOptionsItemSelected(item);
}

Android: Start a new activity from menu item

I'm Trying to open a second screen for my application. The user have to click on a menu item and then the screen must open. But what i try it always just ignores the rule after the case statement.
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.OpenScreen: startActivity(new Intent(this, SecondScreenActivity.class));;
break;
}
return true;
I've also added the activity to AndroidManifest.xml inside the tag.
Any help will be apreciated
Solution
I had the finish() in the constructor of the new class.

For me your java code is correct and work for me that way.
However when I learned Android, when I came at the point of starting a new activity I faced the same problem as you, nothing was happening, without any error, simply not working.
In my case I forgot to add the activity in the AndroidManifest.xml file. Perhaps it is the same for you.
Your AndroidManifest file should contain somewhere something like that
<activity
android:name=".SecondScreenActivity" >
</activity>
this tell the system that SecondScreenActivity exitst.
In
http://developer.android.com/guide/topics/manifest/activity-element.html they say :
All activities must be represented by elements in the manifest file. Any that are not declared there will not be seen by the system and will never be run.
Hope this helps

try like this
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.OpenScreen:
startActivity(new Intent(YourClass.this, SecondScreenActivity.class));
break;
}
return true;

Don't return true for onOptionsItemSelected.
call super method like this.
return super.onOptionsItemSelected(item);
instead of return true;