Transfer Data from One Activity to Another Activity Using Intents

How do I pass data between Activities in Android application?

The easiest way to do this would be to pass the session id to the signout activity in the Intent you're using to start the activity:

Intent intent = new Intent(getBaseContext(), SignoutActivity.class);
intent.putExtra("EXTRA_SESSION_ID", sessionId);
startActivity(intent);

Access that intent on the next activity:

String sessionId = getIntent().getStringExtra("EXTRA_SESSION_ID");

The docs for Intents has more information (look at the section titled "Extras").

How to send string from one activity to another?

You can use intents, which are messages sent between activities. In a intent you can put all sort of data, String, int, etc.

In your case, in activity2, before going to activity1, you will store a String message this way :

Intent intent = new Intent(activity2.this, activity1.class);
intent.putExtra("message", message);
startActivity(intent);

In activity1, in onCreate(), you can get the String message by retrieving a Bundle (which contains all the messages sent by the calling activity) and call getString() on it :

Bundle bundle = getIntent().getExtras();
String message = bundle.getString("message");

Then you can set the text in the TextView:

TextView txtView = (TextView) findViewById(R.id.your_resource_textview);    
txtView.setText(message);

How do I transfer data from one activity to another in Android Studio?

Inside Activity2

You can place data inside the Intent directly or you can put them in a Bundle and then put the inside the Intent. Avoid using both for consistency.

  Intent activity3Intent = new Intent(getApplicationContext(), Activity3.class);
  //Direct Intent approach
  activity3Intent.putExtras("YOUR_STRING_KEY","YOUR_DATA");
  //OR Bundle approach
  Bundle bundle = new Bundle();
  bundle.putString("YOUR_STRING_KEY","YOUR_DATA");
  activity3Intent.putExtras(bundle);
  startActivity(activity3Intent);

Inside the Activity3 class.

//if direct intent approach
String value = getIntent.getStringExtra("YOUR_STRING_KEY") 
//If bundle approach was used.
String value = getIntent().getExtras().getString("YOUR_STRING_KEY");

Pass Intent from one activity to another activity

Here's the solution, thanks to @YodaScholtz for the hint.

I wrote the following code

In MainActivity

Intent intent = new Intent(this, typeof(SecondActivity));
intent.PutExtra("ClipData", intent.ClipData);
StartActivity(intent);

SecondActivity code

if (intent.HasExtra("ClipData"))
{
  var _data = intent.Extras;
  var _clipdata = (ClipData)_data?.GetParcelable("ClipData");
  intent.ClipData = _clipdata;
  ProcessIntent(intent);
}

Transfer data from one Activity to Another Activity Using Intents

Through the below code we can send the values between activities

use the below code in parent activity

Intent myintent=new Intent(Info.this, GraphDiag.class).putExtra("<StringName>", value);
startActivity(myintent);

use the below code in child activity

String s= getIntent().getStringExtra(<StringName>);

Using intents to pass data between activities

Pass the data from Activity-1 to AndroidTabRes.. as below:

At sending activity...

Intent intent = new Intent(current.this, AndroidTabRestaurantDescSearchListView.class);
intent.putExtra("keyName","value");
startActivity(intent);

At AndroidTabRes.. activity...

  String data = getIntent().getExtras().getString("keyName");

Thus you can have data at receiving activity from sending activity...

And in your AndroidTabRestaurantDescSearchListView class, do this:

String value= getIntent().getStringExtra("keyName");

Intent intent = new Intent(this, RatingDescriptionSearchActivity.class);
intent.putExtra("keyName", value);
startActivity(intent);

Then in your RatingDescriptionSearchActivity class, do this:

 String data= getIntent().getStringExtra("keyName");

How to pass data from one activity to another activity

Assuming you are saving the events in some model class, what you can do is when calling the onBindViewHolder method of your adapter, check if the event is marked as save. If it is, then you either need to change the heart image to another heart image which is yellow, or you can apply a tint on the heart image to make it yellow.

You can change drawable by using this code

heartImageView.setImageDrawable(ContextCompat.getDrawable(context, R.drawable.yellow_heart));

You can apply tint by using this code

heartImageView.setColorFilter(Color.argb(255, 255, 255, 0))

EDIT (Based on comment)

If the heart is in the first activity and the interested button is in the second activity what you need to do is to save the state of the event when you click on the interested button. Once you go back to the the first activity, you can check the state of the event and then update the image by using any of the above two methods.

EDIT 2 (Based on new code shared)

After you get the response from your Volley call, you should save the event id somewhere to keep track of which events you are interested in (this can be in either a model class or some global list). When you go back to your first activity (which contains the recyclerview), you need to check each event id with the stored event id list that you have and change the heart for each event that matches.

Passing data from one activity to another and then printing

The problem is your intent in your first class

Intent intent = new Intent("com.example.*******.loginpage.User"); <-- have created an intent
intent.putExtra("username",String.valueOf(username));
startActivity(new Intent(MainActivity.this, User.class)); <-- but using new Intent

You have created an intent but you passing new intent. Use your created Intent instead of passing new Intent.

Intent intent = new Intent(MainActivity.this, User.class);
intent.putExtra("username",String.valueOf(username));
startActivity(intent);

EDIT

Instead using String.valueOf(username) you must use username.getText(), because String.valueOf(username) is method to translate your object to String.

Intent intent = new Intent(MainActivity.this, User.class);
intent.putExtra("username",username.getText());
startActivity(intent);