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How to send/detect a reference/flag to a specific activity from another

How can I send or detect a reference or flag if a specific Activity was started from another Activity or not? I actually need a form in which I can execute only a certain piece of code only if this code was called by a specific Activity, for example:
Activity 1:
Intent intent = new Intent(this,ranking.class);
startActivity(intent);
Activity2:
Intent intent = new Intent(this,ranking.class);
startActivity(intent);
Ranking.class (It's pseudocode since I don't really know how/what to do):
if(I was called by Activity 1) {
//do something
} else {
finish();
}

You can .putExtra a message to your Intent.
Activity 1
Intent intent = new Intent(this,ranking.class);
intent.putExtra("activity", 1);
startActivity(intent);
Activity 2
Intent intent = new Intent(this,ranking.class);
intent.putExtra("activity", 2);
startActivity(intent);
Ranking.class
Intent intent = getIntent();
int activityNumber = intent.getIntExtra("activity", 0);
if (activityNumber == 1) {
//do something
} else{
finish();
}

The answer by #israel-dela-cruz is correct, you need to use extra to differentiate the flags. Here the more compact version to avoid using magic number and magic key:
public class RankingActivity extends Activity {
private static final ACTIVITY_OPTION_KEY = "activityOptionKey";
private static final int FROM_ACTIVITY_ONE = 1;
private static final int FROM_ACTIVITY_TWO = 2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_rating);
...
Bundle bundle = getIntent().getExtra();
int option = bundle.getInt(ACTIVITY_OPTION_KEY);
if(option == FROM_ACTIVITY_ONE) {
// do something when called from activity one
} else if(option == FROM_ACTIVITY_TWO) {
// do something when called from activity two
} else {
// is there something else?
}
...
}
// Use intent factory to remove dependency to magic number and magic key
public static Intent createIntentFromActivityOne(Activity activity) {
Intent intent = new Intent(activity, RatingActivity.class);
intent.putExtra(ACTIVITY_OPTION_KEY, FROM_ACTIVITY_ONE);
return intent;
}
public static Intent createIntentFromActivityTwo(Activity activity) {
Intent intent = new Intent(activity, RatingActivity.class);
intent.putExtra(ACTIVITY_OPTION_KEY, FROM_ACTIVITY_TWO);
return intent;
}
}
then you can create the intent without knowing the RatingActivity magic key and magic number:
// from activity one
Intent intent = RatingActivity.createIntentFromActivityOne(this);
startActivity(intent);
// from activity two
Intent intent = RatingActivity.createIntentFromActivityTwo(this);
startActivity(intent);

Android Studio: Activity only finishes when you call the finish() for second time

So, we're working with intents at school and I'm having trouble with the intents when I try to pass data from the "Activity2" to the "Activity1", when I do the setResult() and stuff. The problem is it won't go back to the first activity when I trigger the event the first time, but it will the second.
I've been working with Android studio only for about 12h so I really lack a lot of understanding.
Here is what I'm doing:
First I call this form the main activity.
public void CheckPassword(View view) {
password = PasswordManagement.getPassword(this);
TextView txtPassword = findViewById(R.id.txtPassword);
if (txtPassword.getText().toString().equals(password)) {
Intent intent;
intent = new Intent(this, WelcomeActivity.class);
intent.putExtra("password", password);
startActivityForResult(intent, 1);
startActivity(intent);
} else {
Intent intent;
intent = new Intent(this, RestrictedActivity.class);
startActivityForResult(intent, 1);
startActivity(intent);
}
}
Then, when I'm done from the second activity I run this:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_restricted);
lblRestrictedArea = findViewById(R.id.lblRestrictedArea);
lblRestrictedArea.setOnLongClickListener(
new OnLongClickListener() {
public boolean onLongClick(View view) {
intent = new Intent();
intent.putExtra(EXTRA_RESPONSE, true);
setResult(RESULT_OK, intent);
finish();
return false;
}
});
}
And back to the main activity I overwrote this to act according to the response:
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == 1) {
if (data.getBooleanExtra(RestrictedActivity.EXTRA_RESPONSE,false)){
LinearLayoutPasswordActivity.setBackgroundColor(getResources().getColor(R.color.red));
}else{
LinearLayoutPasswordActivity.setBackgroundColor(getResources().getColor(R.color.white));
}
}
}
}
If anyone can help I would be very glad, meanwhile I'll try to solve it my own.
Thanks!

Your are calling startActivity twice. So there are two instance of the same Activity and then you have to finish twice.
Keep your startActivityForResult(...) and delete startActivity in CheckPassword(View view)
->
public void CheckPassword(View view) {
password = PasswordManagement.getPassword(this);
TextView txtPassword = findViewById(R.id.txtPassword);
if (txtPassword.getText().toString().equals(password)) {
Intent intent;
intent = new Intent(this, WelcomeActivity.class);
intent.putExtra("password", password);
startActivityForResult(intent, 1);
// startActivity(intent);
} else {
Intent intent;
intent = new Intent(this, RestrictedActivity.class);
startActivityForResult(intent, 1);
//startActivity(intent);
}
}
Plus, note that you are using the same requestCode (1) for two different activities. The requestCode is very important for onActivityResult method.

Passing a string or a variable from a dialoguebox to an activity Android

I wan to implicitly pass two string or variable from a dialoguebox to be used by another activity and at the same time opening that activity.
dialoguebox
String city = addresses.get(0).getLocality();
String category = "Hazard";
AlertDialog.Builder prompt = new
AlertDialog.Builder(MapsActivity.this);
prompt.setCancelable(false)
.setPositiveButton("Mineralization", new
DialogInterface.OnClickListener() {
.setPositivetiveButton("Geohazard", new
DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog,
int which) {
startActivity(new
Intent(getApplicationContext(),MapsActivity.class));
//i want to pass the String city and category here
}
}
)
AlertDialog alert = prompt.create();
alert.setTitle("Please select an option");
alert.show();
TextView myTextView = (TextView) findViewById(R.id.PSString);
myTextView.setText(city);
New activity
package com.example.boneyflesh.homepage;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class GeohazardResults extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_geohazard_results);
}
}
how do i do this? what do i write on the onClickListener and what do i do on the new activity so that i can get the strings?

Instead of doing something like this in your onClick method
startActivity(new Intent(getApplicationContext(),MapsActivity.class));
You can just pass the two strings through the intent to the MapsActivity inside your onClick method as shown below
Intent lIntent = new Intent(getApplicationContext(), MapsActivity.class);
lIntent.putExtra("city", city);
lIntent.putExtra("category", category);
startActivity(lIntent);
and retrieve those values in MapsActivity as shown below
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_geohazard_results);
String city = getIntent().getStringExtra("city");
String category = getIntent().getStringExtra("category");
}

Pass Using Intent and Bundle like Below:
Intent intent = new Intent(getApplicationContext(),MapsActivity.class));
Bundle bundle =new Bundle();
bundle.putString("key1","value1");
bundle.putString("key2","value2");
intent.putExtras(bundle);
startActivity(intent );
And Retrieve value in next Activity like below:
Bundle bundle = getIntent().getExtras();
String value1= bundle.getString("key1");
String value2= bundle.getString("key2");

You need to use extras to send the data.
For example:
Intent intent = new Intent(getApplicationContext(),MapsActivity.class);
intent.putExtra("SOME_NAME_HERE", theString);
startActivity(intent);
Then, in the target activity you write - in onCreate:
Bundle extras = getIntent().getExtras();
if(extras == null) {
theString= null;
} else {
theString = extras.getString("SOME_NAME_HERE");
}

In your dialogbox:
Intent i = new Intent(MapsActivity.this, GeohazardResults.class);
i.putExtra("city", city);
i.putExtra("category", categoty);
startActivity(i);
In your new activity:
Intent i = getIntent();
Bundle extras = i.getExtras();
String city = extras.getString("city");
String category = extras.getString("category");

Instead of doing this -:
startActivity(new Intent(getApplicationContext(),MapsActivity.class));
Do something like this -:
Intent mapsActivityIntent = new Intent(getApplicationContext(), MapsActivity.class);
mapsActivityIntent.putExtra("CITY", city);
mapsActivityIntent.putExtra("CATEGORY", category);
startActivity(mapsActivityIntent);
In your activity you can then get them by doing :
getIntent().getStringExtra("CITY");
getIntent().getStringExtra("CATEGORY");

DialogInterface.OnClickListener() {
.setPositivetiveButton("Geohazard", new
DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog,
int which) {
Intent intent = new Intent(getApplicationContext(),MapsActivity.class))
// intent.putExtra(key,value);
intent.putExtra("String1","value1");
intent.putExtra("String2","value2");
startActitvity(intent);
}
}
)
in Acivity
Intent intent = getIntent();
Bundle extras = intent.getExtras();
if(extras != null){
//intent.getStringExtra(key)
string1 = intent.getStringExtra("String1");
string2 = intent.getStringExtra("String2");
}
i would suggest define keys as constants and use those while passing values, to avoid any confusion

pass intent from your dialog like this
Intent intent=new Intent(context, GeohazardResults.class);
Bundle parameters=new Bundle();
parameters.putString("city",city);
parameters.putString("category",category);
intent.putExtra("key",parameters);
startActivity(intent);
and in the next activity receive thiese values like this.
Intent receivedIntent=getIntent();
if(receivedIntent!=null){
Bundle parameters=receivedIntent.getBundleExtra("key");
if(parameters!=null){
String city=parameters.getString("city");
String category=parameters.getString("category");
}
}

How to call one activity multiple times based on from which the activity has been called?

I have one activity which is common for all other activities. I want to call this activity and want to set some conditions based on from which activity it has been called. I thought of bundle for this. How can I call a condition based on bundle value? I have another activity in between. I am not calling the activity directly. So how can we pass data by using bundle?
txt_from.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
i = new Intent(getApplicationContext(), PickLocationActivity.class);
GoSendData.instance.addressType = 0;
i.putExtra("type",1);
startActivity(i);
}
});
From this I am calling second activity.
In common activity I have a view I am calling the activity back from this. The activity from which it has been called , it should be called back from this view.
useLocation.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Bundle extras = intent.getExtras();
activityType = extras.getInt("type");
if(activityType==0) {
intent = new Intent(ChooseFromMapActivity.this, GoSend.class);
startActivity(intent);
}
if(activityType == 1)
{
intent = new Intent(ChooseFromMapActivity.this, GoRideActivity.class);
startActivity(intent);
}
}
});
How to achieve this...?
How can I do this with shared preferences?

Change
Bundle extras = intent.getExtras();
to
Bundle extras = getIntent().getExtras();
Hope this helps :)

Check the below code
Activity_1. : This will send the data to the Common Activity.
Intent i = new Intent(Activity_1.this, CommonActivity.class);
i.putExtra("type",1);
startActivity(i);
Activity_2. : This will send the data to the Common Activity.
Intent i = new Intent(Activity_2.this, CommonActivity.class);
i.putExtra("type",2);
startActivity(i);
Then on your Common Activity write this code in the onCreate function.
int receivedValue = getIntent().getIntExtra("type", 0);
// here 0 is the default value when there is no data in the particular key.
now you can check the condition like this
if(receivedValue==1)
{
// do something here
}
if(receivedValue==2)
{
// do something here
}
This will definitely work for you. Try it..!!
Happy coding.

Activity1,
txt_from.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
i = new Intent(getApplicationContext(), PickLocationActivity.class);
GoSendData.instance.addressType = 0;
i.putExtra("type",1);
startActivity(i);
}
});
Activity2,
txt_from.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
i = new Intent(getApplicationContext(), PickLocationActivity.class);
GoSendData.instance.addressType = 0;
i.putExtra("type",2);
startActivity(i);
}
});
Common Activity
useLocation.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = getIntent();
int type = i.getInt("type");
if(type==1) {
Intent intent = new Intent(ChooseFromMapActivity.this, Activity1.class);
startActivity(intent);
}
if(type == 2)
{
Intent intent = new Intent(ChooseFromMapActivity.this, Activity2.class);
startActivity(intent);
}
}
});

Intent putExtra persists

i'm having an issue with Intents and putExtra.
What i want to do is this :
In Activity A(it's not my MainActivity),when i click a button,it will close all my activities, send a string and launch my main activity.For testing purposes it will show a test dialog with my string.All good till now,works as i need it to.
The problem is that if i restart my MainActivity(and i need to do that,it's something like a shopping list,i need to start a new shopping list) the dialog with the putExtra string shows again.
Here are my code snippets :
In Activity A :
#Override
public void onClick(View v) {
Intent intent = new Intent(Gestionarez.this, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK|Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_NO_ANIMATION);
intent.putExtra( "paramName", str );
startActivity( intent );
// TODO Auto-generated method stub
dialog.dismiss();
dialog.cancel();
}
In my MainActivity
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
LoadPref();
Bundle extras = getIntent().getExtras();
if (extras != null) {
String myParam = extras.getString("paramName");
ShowAlertMessage(this, "TEST", myParam + "");
} else {
}
}
And this is how i restart my MainActivity when i need to start a new shopping list :
Intent intent = getIntent();
finish();
startActivity(intent);

replace
Intent intent = getIntent();
finish();
startActivity(intent);
with
Intent intent = new Intent(this, ActivityB.class);
finish();
startActivity(intent);