Develop Reference

How to get Object of calling Activity in an Intent?

I have two Activities.
I got my FirstActivity and SecondActivity and I start an Intent from the first activity which brings me from the first to the second one like this:
startActivity(new Intent(FirstActivity.this, SecondActivity.class));
Now I need an Instance of my FirstActivity in the second activity. My working approach was a static instance in my FirstActivity:
private static FirstActivity firstActivity;
onCreate(...) { firstActivity = this; }
public static FirstActivity get() { return firstActivity; }
This although is breaking InstantRun and is considered as a memory leak. I know that I can send Parcelable's through intents, but I need my FirstActivity object.

A typical solution for this is inheritance:
Step #1: Create a BaseActivity class that extends from whatever you are using right now (Activity, AppCompatActivity, etc.)
Step #2: Have FirstActivity extend BaseActivity
Step #3: Move the onCreateOptionsMenu() and onPrepareOptionsMenu() methods from FirstActivity to BaseActivity
Step #4: Have SecondActivity also extend BaseActivity
Another option would be to use static utility methods for the common code bits, where those static methods are called by the onCreateOptionsMenu() and onPrepareOptionsMenu() of FirstActivity and SecondActivity.

//first activity
Bundle bundle = new Bundle();
bundle.putSerializable("TAG", object);
Intent intent = new Intent(getApplicationContext(), ActivityB.class).putExtras(bundle);}
startActivity(intent);
//second activity
onCreate().....
Bundle bundle = getIntent().getExtras();
if(bundle!=null){
Object object = (Object) bundle.get("TAG");
//and implements serializable in your class object

Passing a reference of an object to activity

I have a reference to an anonymous class object that I want to pass to an activity. It is a kind of reference to a callback fn which gets called based on an action on activity i.e. click of button. But, I dont know a way to do so as activities can not be instantiated directly (done only through startActivity) and using intents will pass my object by value not by reference. So, I need tips on a good solution. I want to avoid statics.

Short Answer: No You cannot pass objects as references to activities.

Try this
CustomListing currentListing = new CustomListing();
Intent i = new Intent();
Bundle b = new Bundle();
b.putParcelable(Constants.CUSTOM_LISTING, currentListing);
i.putExtras(b);
i.setClass(this, SearchDetailsActivity.class);
startActivity(i);
Afterwards to call
Bundle b = this.getIntent().getExtras();
if (b != null)
mCurrentListing = b.getParcelable(Constants.CUSTOM_LISTING);

Here is the answer :
Create a public static method in the Activity to which you want to pass the reference of an object.
public static void openActivity(Activity activity, Class object){
YourNextActivity.object = object;
Intent intent = new Intent(activity, YourNextActivity.class);
activity.startActivity(intent);
}
Call this method from current Activity :
YourNextActivity.openActivity(this, classObject);

pass data from activity one to activity three directly while going through activity two but data should not be passed to activity two

I have three activities A,B and C. I need to pass some data from activity A to activity C. But the navigation is from A to B to C i.e. I can't go to activity C from activity A directly. I don't want to pass my data to activity B from A and I don't want to use any external storage like sqlite or shared preferences. Can it be done through intent ? If yes , how ? If no, is there any other way ?

use Interface to communicate with other Activity.
or you can make your variable public static on Activity1

The problem is that your third activity has no way of knowing which activity sent the bundle. You need to add a field that identifies what type of bundle this is so you can process accordingly. For instance, in activity 1:
Intent i = new Intent(ActivityOne.this, ActivityTwo.class);
i.putExtra("activity", (int)1);
i.putExtra("key", value);
startActivity(i);
Then in 3rd activity:
Bundle extras = getIntent().getExtras();
if(extras !=null) {
int typeAct = extras.getInt("activity");
if (typeAct == 1) {
//do something with data
}

There are various ways to send the data from one activity to other activity,
Now as you can not use intent so I would suggest you to go with either Application class or create a Global singleton class to hold your data.
Please refer following link
https://androidresearch.wordpress.com/2012/03/22/defining-global-variables-in-android/
Following are the steps to create an application class:
Step 1: Create any class and extend it with the Application class:
public class Globals extends Application{
private int data=200;
public int getData(){
return this.data;
}
public void setData(int d){
this.data=d;
}
}
Step 2: Defining the application class in the manifest file:
<application
android:name=".Globals"
.... />
Step 3:Now by calling getApplication() in any of the activity you get your application class. Just typecast it and call the methods required.
Globals g = (Globals)getApplication();
int data=g.getData();
I hope this will help.

make one interface :
public interface PassData {
public void data(String data);
}
if you want to pass the data from activity A to activity C then :
from Activity A you need to pass the data like this:then on Activity A.
PassData passData;// make it global variable
passData.data("Your DATA WHICH YOU WANT TO SEND TO ACTIVITY C");
In Activity C :
ActivityC extends AppCompatActivity implements PassData{
//onCreate Stuff
#Override
public void data(String data) {
// print this data and see it's coming or not
}

yes sure.
for example in your Activity
class ActivityA extend Activity{
public static String abc = "hello";
}
in ActivityC
ActivityC extend Activity{
onCreate(){
String a = ActivityA.abc;
Log.d("test",a);
}
}

Passing data from two activities to a third activity in android

have total 3 activites. I pass the data from the first activity like this:
Intent intent = new Intent(getActivity(), Movie_rev_fulldis_activity.class);
intent.putExtra("mov_pos", position + "");
startActivity(intent);
this working fine all data visible to my second activity but i want to display
one filed item to third activity when i click second activity image
here my second activity
youtube_image.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent youtube= new Intent(getApplicationContext(),PlayYouTube1st.class);
youtube.putExtra("youtubeLink",youtubeLink);
startActivity(youtube);
// Toast.makeText(Movie_rev_fulldis_activity.this,
// youtubeLink, Toast.LENGTH_LONG).show();
}
});
youtubeLink=Reviews_update.revData.get(mov_pos).getYoutubeLink();
Toast.makeText(Movie_rev_fulldis_activity.this,
Reviews_update.revData.get(mov_pos).getYoutubeLink(), Toast.LENGTH_LONG).show();
mov_pos=Integer.parseInt((getIntent().getExtras()).getString("mov_pos"));
in second activity i am getting values but when i send one filed to third activity that value passing null any one please help me i stuck in their,
I want to show YoutubeLink field sencnd activity to third activity how to parse that any one please help

In FastActivity:
Intent in = new Intent(FastActivity.this, SecondActivity.class);
in.putExtra("a", yourdata);
startActivity(in);
In SecondActivity:
Bundle extras = getIntent().getExtras();
if (extras != null) {
String a = extras.getString("a");
}

You can also use any static variable and use it in any class
static int a = 5;
And in any other class
int b = classname.a;
classname is the class where static variable is declared.

Make that variable static and then pass
Your variable object reference get change in the THIRD Activity so, it returns null

Accessing instance of the parent activity?

Suppose I have a class first.java (activity class) and I start another activity in this class (second.java - activity class).
How can I access the instance of first.java from second.java?
Can someone give me a good explanation on this... An example would be great...

If you need your second activity to return some data to your first activity I recommend you use startActivityForResult() to start your second activity. Then in onResult() in your first activity you can do the work needed.
In First.java where you start Second.java:
Intent intent = new Intent(this, Second.class);
int requestCode = 1; // Or some number you choose
startActivityForResult(intent, requestCode);
The result method:
protected void onActivityResult (int requestCode, int resultCode, Intent data) {
// Collect data from the intent and use it
String value = data.getString("someValue");
}
In Second.java:
Intent intent = new Intent();
intent.putExtra("someValue", "data");
setResult(RESULT_OK, intent);
finish();
If you do not wish to wait for the Second activity to end before you do some work in the First activity, you could instead send a broadcast which the First activity reacts to.

You can simply call getParent() from the child activity.
I have no clue why other answers are so complicated.

Only this should work
class first
{
public static first instance;
oncreate()
{
instance = this;
}
}
first.instance is the required thing that is accessible from the second class

try this if this work 4 u.........
something like this.....
class first
{
public static first instance;
oncreate()
{
instance=this;
}
public static getInstance()
{
return instance;
}
}
now from second class call first.getInstance();
you can also directly acess instance in static way like this first.instance.......
Thanks...

You can't create an activity directly.
In the first activity take a static activity variable like this,
public static Activity activity;
In the onCreate do this.
activity = this;
Then in the second activity do this,
Activity activity = (your activity name).activity;
Edit:
For passing data from one activity to other activity this is not the way.
Above answer was to get activity instance from other activity which was initially asked.
To pass data from one activity to other activty generally use bundle. But if the data is not primitive data type, then use object class which should implement parcelable or serializable interface. Then through bundle only parcelable list of objects we can pass.