Dfyjkt

This is an easy one.

1. Use SharedPreference of changing data(boolean maybe) in MainAcitivity


2. Use SharedPreference.OnSharedPreferenceChangeListener in SecondActivity for listening to that specific data and changing button state at runtime in.

MainActivity.java

public class MainActivity extends AppCompatActivity 

SharedPreferences.Editor editor;


public void myEventListener(int eventID)

 switch (eventID) 
 case 0:
 editor = getSharedPreferences("pref",MODE_PRIVATE).edit();
 editor.putBoolean("event",true);

 break;
 

SecondActivity

public class SecondActivity extends AppCompatActivity implements SharedPreferences.OnSharedPreferenceChangeListener 

SharedPreferences sharedPreferences;
@Override
protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_first);



@Override
protected void onStart() 
 super.onStart();

 sharedPreferences=getSharedPreferences("pref",MODE_PRIVATE);
 sharedPreferences.registerOnSharedPreferenceChangeListener(this);



@Override
protected void onStop() 
 super.onStop();
 sharedPreferences.unregisterOnSharedPreferenceChangeListener(this);



@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) 
 if(key.equals("event") && sharedPreferences.getBoolean(key,false))
 
 //add your code to disable your button or any action you want

 

It's very simple to disable a button. Follow the below steps to achieve your problem.

1. Define a global boolean value as "false"


2. In onClickEvent override, the boolean value as "true".

Then check with the boolean value as follows

private boolean isClicked = false;

if(isClicked)
 button.disabled(true);
 else 
 button.disabled(false);

Please let me know if you have any issues while applying.

In you First Activity make Boolean static variable.

Example:

FirstActivity

create a Boolean static global variable

public static Boolean clicked = false;

onFirstActivity if Event occurs.

event occurred => clicked = true; otherwise it is false

SecondActivity

in second activity get the value to static boolean from FirstActivity

 button.setOnClickListener(new View.OnClickListener() 
 @Override
 public void onClick(View v) 
 if (FirstActivity.clicked)
 //Do Nothing
 else
 //Perform action
 

 
 );

first make reference of second activity and set button visibility GONE or INVISIBLE It's Work

SeconActivity sa; //reference of second activity
public void myEventListener(int eventID)
switch (eventID) 
case : 0
sa.btnofsecondactivity.setVisibilty(View.GONE);
break;

You can go with LocalBroadCastManager.

in MainActivity wherever you want to trigger the method

LocalBroadcastManager.getInstance(this).sendBroadcast(new Intent("event-occured"));

in SecondActivity register the LocalBroadcastManager and receive it.

public class SecondActivity extends AppCompatActivity {

private BroadcastReceiver mainActivityReceiver;

@Override
protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_second);

 mainActivityReceiver = new BroadcastReceiver() 
 @Override
 public void onReceive(Context context, Intent intent) 
 // do whatever you want to do

 Log.d("TAG", "broadcast received");
 
 ;
 LocalBroadcastManager.getInstance(this).registerReceiver(mainActivityReceiver, new IntentFilter("main-activity-initialized"));



@Override
protected void onDestroy() 
 super.onDestroy();
 LocalBroadcastManager.getInstance(this).unregisterReceiver(mainActivityReceiver);

Don't forget to unregister the listener in SecondActivity's onDestroy method. Taken reference from here.