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How to exit onBackPressed method in android studio?

I have developed an android apps that have a splash screen and a login page. The problem is when a user give credential and pressed log in button it open controlActivity. but when I pressed back button, I navigate to login page again If I pressed back button again I navigate to splash screen. How can I stop navigating to previous page, when user press back button then app should exit?

Why does it happen ?
This is happening because whenever you open another activity from intent, it creates it over it.
How to solve the problem?
You can add a flag like this
Intent intent = new Intent(this, SecondActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
OR
You can finish it.
Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);
finish();
If you want to close the app onBackPressed, you can override the method. Add this to your activity.
#Override
public void onBackPressed(){
finish();
System.exit(0);
}
Doing this, the app will be closed on back pressed!

You need to put a flag in the activity you want to be forgotten.
Intent intent = new Intent(this, Main2Activity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);

Answer by #Sambhav Khandelwal should solve your problem. In your splash screen you need to do add flags with intent like:
Intent intent = new Intent(SplashScreenActivity.this, LoginActivity.class); //assuming your splash screen name as SplashScreenActivity and login as LoginActivity
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
Or you can do without flags like below:
Intent intent = new Intent(SplashScreenActivity.this, LoginActivity.class);
startActivity(intent);
finish();

how to open fragment from another activity android

i am trying to use startactivityfromfragment()
i didnt find sumthing usefull for me to be a good example
until now i was able to move data(string of web url) from fragment to fragment
now its a diffrent story.. i think i need to use startactivityfromfragment()..
but dont know how
Bundle bundle = new Bundle();
bundle.putString("WEB","someweb.com");
MultiFragment multiFragment = new MultiFragment();
multiFragment.setArguments(bundle);
Intent intent1 = new Intent(getBaseContext(), MultiFragment.class);
startActivityFromFragment(MainActivity.class,intent1,"WEB");

Try this:
Put this code in current fragment, from where you want to open an activity.
Intent i=new Intent(getActivity(),Multifragment.class);
i.putExtra("key","value");
getActivity().startActivity(i);
In the next activity which contains fragment, put these:
String value=getIntent().getStringExtra("key");
Bundle bundle=new Bundle();
bundle.putString("key",value);
YourFragmentClass ob=new YourFragmentClass();
ob.setArguments(bundle);
getActivity().getSupportFragmentManager().beginTransaction().replace(R.id.your_container_layout,ob).addToBackStack(null).commit();
Then, In YouFragmentClass:
Bundle=getArguments();
if(bundle!=null}
String value=bundle.getString("key");

Use your Activity name as second parameter in which the your MultiFragment exist
Intent i = new Intent(MainActivity.this, ActivityName.class);
putExtras(bundle);
startActivity(i);
finish();

Method 1
For sending data from activity to another activity's fragment call a normal intent with bundle value, In another activity check on getIntent() and call a method from that fragment
Intent intent = new Intent(this, MainActivity.class);
intent.putExtra("web_url", "url");
startActivity(intent);
and call from another activity
String webUrl = getIntent().getStringExtra("web_url");
Fragment newFragment = getSupportFragmentManager().findFragmentById(R.id.frame_tab);
newFragment.openWeb(webUrl);
Method 2
In second activity make a static variable and save the data from getIntent() and in fragment use that variable.
Mehtod 3
interface FragmentListner{
void openFragment(String url);
}
Activity A :
FragmentListner frag = new FragmentListner();
frag.openFragment("Url");
Activity B:
class B implements FragmentListner{
void openFragment(String url){
//Open Fragment here
}

I think:
In an activity that doesn't contain fragment:
Intent intent = new Intent(ActivityA.this, ActivityB.class);
intent.putExtra("something", "yep");
startActivity(intent);
And, in the next activity which contains fragment:
Intent intent = getIntent();
String op = intent.getStringExtra("something");
if (op != null){
getSupportFragmentManager().beginTransaction().replace(R.id.nav_host_fragment,
new YourFragment()).addToBackStack(null).commit();
}

How do I implement a Button that will return to "Home" after it is clicked?

I have created a "Button" in android studio to send emails. When I click it, it sends an email as intended, but does not then return to the "Home" activity.

You can use finish(); method, but it's not recommended.
See: How to finish current activity in Android
http://developer.android.com/guide/components/processes-and-threads.html#Threads
But, this is my suggestion, you should be able to after clicking the Button, then clear the activity and restart it(or you can do something like Gmail App and doing some stuffs after clicking):
Intent i = getBaseContext().getPackageManager().getLaunchIntentForPackage(getBaseContext().getPackageName());
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
Also you can use:
Intent m = new Intent(FirstActivity.this, SecondActivity.class);
startActivity(m);
Or:
startActivity(new Intent(FirstActivity.this, SecondActivity.class));

Intent intent = new Intent(context, HomeActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
finish();

Clearning Stack of Activities unto the Top

I want to perform a logout function in which I want to clear all the activities before the logout and start a new Login Activity
Here is my code
Utilities.logoutPlayerDefaults(Profile.this);
Utilities.vibrate(Profile.this);
Intent myIntent = new Intent (Profile.this,FBLogin.class);
myIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(myIntent);
But it doesn't work. If i press back button i go back to Profile

Try following way,
#Override
public void onBackPressed()
{
Intent myIntent = new Intent (Profile.this,FBLogin.class);
myIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
myIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
myIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(myIntent);
super.onBackPressed();
}

Change your code to below :
Utilities.logoutPlayerDefaults(Profile.this);
Utilities.vibrate(Profile.this);
Intent myIntent = new Intent (Profile.this,FBLogin.class);
myIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(myIntent);
finish();

Passing data between 2 activities

I am programming in android for a Samsung tablet, and I have 2 activities, one of this is a list of football teams, and the other activity is their twitter, but i have a problem to pass the parameter for the first activity to the second one. I want to pass their url like a string, but i cant get it.
Thanks!

You have to use Intent:
Intent i = new Intent(this, SecondActivity.class);
i.putExtra("extraURL", "http://myUrl.com");
startActivity(i);
Then, to retrieve it in SecondActivity, in the onCreate method do:
Intent receivedIntent = getIntent();
String myUrl = receivedIntent.getStringExtra("extraURL");

You typically launch the 2nd Activity from the first using an Intent. You can pass data to the 2nd Activity using the same Intent you use to launch it. For example,
Intent i = new Intent(this, SecondActivity.class);
i.putExtra("url", "http://url.you.want.to.pass/");
startActivity(i);
In the 2nd Activity, in the onCreate, you can read the data using:
Intent i = getIntent();
String url = i.getStringExtra("url");

your First Activity on click of button
Intent intent = new Intent(this,ActivityTwo.class );
intent.setAction(intent.ACTION_SEND);
intent.putExtra("www.google.com",true);
startActivity(intent);
Receive it in ActivityTwo:-
Intent intent = getIntent();
String msg = intent.getStringExtra("www.google.com");