Develop Reference

Change text content depending on button clicked within the same class

My problem is exactly like this link but it's not in android.
I have one button on a layout and two buttons on an another one. On my application, ClickScreen activity can be triggered by either FirstCase activity or SecondCase activity.
I tried to make a conditional statement on my ClickScreen for which activity is triggered but couldn't handle it. I don't want to create two more classes to do this since it's not an efficient technique.
private void goTo2ndPage() {
Intent i3 = new Intent(this, ClickScreen.class);
startActivity(i3);
}
public class ClickScreen extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.click_screen);
}
}

As we discussed in comments. It looks like what you really want is to add extra data in your intent so that Started Activity can get it and act accordingly.
Check out this post !

Refresh only once when intent to new activity

In android studio, I can refresh the activity using the following method. When Button onClick, it refreshData at current activity.
public void refreshData(){
Intent intent = getIntent();
finish();
startActivity(intent);
}
Now the thing I want to do is, when Button onclick, it jump from Activity A.class to B.class, and instantly refresh B.class. I needed it because of pulling database data at first time .
In order words I need refresh second activity when any activity jump to it.
Second activity:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_history);
getData(); //get database data
addData(); //set data to variable
refreshData(); // I wish to refresh the Activity 2 Interface
}

Just call your database entries from Activity B's onCreate() method, so that every time Activity B is loaded (called from any Activity), the database entries are re-fetched and filled into the UI. Pretty straight forward, isn't it?

Create custom method for pulling database data in second activity .
then call the custom method in oncreate of second activity .
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
getdataMethod();// pulling database data
}

calling the same activity using a for

Hi everyone.
I'm new in android and I'm working on an app in which I need to recall the same activity to enter the information of a variable amount of entities (passengers).
I have the following:
btnContinue3.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
for (int i=0; i<Pssngr; i++){
passenger[i] = new
Intent(getApplicationContext(), Pasajeros.class);
startActivity(passenger[i]);
}
}
});
Pssngr is the amount of passsengers or entites that need a unique activity to get their information entered.
The trigger is the button then the activities will be called one by one following an array
I try this code but after clicking on the button the app crashed.
Please someone help me find a way to make this work.
thanks

It crashes because You are trying to start x number of Activities at once.
If You have to run new Activity for each of Passengers best in this scenario will be startActivityForResult
I beliver effect You trying to get is that user clicks on button just once and activities for each passenger will open one after another.
To do it in method onClick You will start only first activity, don't use loop.
You start consequently next activities in onActivitiyResult

In addition to what Gustek mentions above, a better way to approach this would be to have one activity and just pass the different values from the parent (PassengersAvitivty) activity through the intent as below:
final Intent intent = new Intent(PassengersAcitivty.this, PassengersEntityActivity.class);
intent.putExtra("PASSENGER_FIRSTNAME", passenger[i].getName());
intent.putExtra("PASSENGER_LASTNAME", passenger[i].getLastName());
intent.putExtra("PASSENGER_EMAIL", passenger[i].getEmail());
startActivity(intent);
and here is how you can retrieve them on your activity (PassengerEntityActivity)
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle extras = getIntent().getExtras();
if (extras != null)
{
firstname = extras.getString("PASSENGER_FIRSTNAME");
lastname = extras.getString("PASSENGER_LASTNAME");
email = extras.getString("PASSENGER_EMAIL");
}
else
{
//Log.v("NO VALUE", "OOPS");
}
I can clarify further if needed.

Problems sending data from one activity to another with application

As the title says I want to transfer data, in this case the information introduced by the user on an EditText and a Spinner, from one activity to another.
I am following a tutorial from a book but it doesn't work (I think its not complete). Here the code of the program:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.main);
this.location=(EditText)findViewById(R.id.location);
this.cuisine=(Spinner)findViewById(R.id.cuisine);
this.grabReviews=(Button)findViewById(R.id.get_reviews_button);
ArrayAdapter adapter = ArrayAdapter.createFromResource(this, R.array.cuisine, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
this.cuisine.setAdapter(adapter);
this.grabReviews.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
handleGetReviews();
}
}
);
}
private void handleGetReviews() {
RestaurantsActivity application= (RestaurantsActivity) getApplication();
application.setReviewCriteriaCuisine(this.cuisine.getSelectedItem().toString());
application.setReviewCriteriaLocation(this.location.getText().toString());
Intent intent=new Intent(Constants.INTENT_ACTION_VIEW_LIST);
startActivity(intent);
}
This code above doesn't work. I dont understand four things:
-RestaurantsActivity must be the actual activity right?
-In all the examples I have seen over the internet there is an application extends class, in this example there isnt.
-setReviewCriteria function is missing
-Where does Constants.INTENT_ACTION_VIEW_LIST come from ?

So your target is to get the data to Restaurantsactivity?
Normally data in android are handed over from one activtiy to another by using Intents.
So first you create an intent.
Then you put the data you want to transfer into the intent by using the intent.putExtra() method.
In the activity that gets the intent you can get the data by using getIntent().getExtra() method (getExtra can be something like getStringExtra()).
Here is a small example for a edit box called "name":
public void onCreate(Bundle iBundle){
//do some stuff here
//perhaps define some Buttos and so on
//now lets start the activity
Intent intent = new Intent(currentActivityname.this, ActivityYouWantToStart.class);
intent.putExtra("name", name.getText().toString())
startActivity(intent); // you can also start an startActivityForResult() here :)
}
In our receiving activity you can now handle the intent (e.g. in the onCreate() method
public void onCreate(Bundle iBundle){
String name = this.getIntent().getStringExtra("name",some default value);
}

Try to put data in the Bundle and start Activity with this Bundle
Intent intent = new Intent(this, YourSecondActivity.class);
intent.putExtra(... HERE YOUR BUNDLE WITH DATA ...);
startActivity(intent);
Hope, it help you!

How to pass checked items to another activity?

I got list of checked contacts.However, i need to pass these selected contacts to another activity and display in edit Text.Please help.Thanks

You have a few solutions...
You can use static fields in your Java classes
You can pack the data into Intents via Intent.putExtra
Option (1) is probably going to be the easiest and quickest if you are trying to send data between your own activities. Option (2) is what you must do if you wish to send data to Activities of another applications.
I suggest you read these Q&A first though as some cover this question in more depth...
Passing data of a non-primitive type between activities in android
Passing data between activities in Android
Switching activities/passing data between activities

You have to use an Intent to do so.
Example, to pass the data to an activity already running:
public void sendToActivity(Object data){
Intent i = new Intent("SEND_DATA");
i.putExtra("data", this.catchReports.get(data));
sendBroadcast(i);
}
Then, you have to setup a listener in your receiving activity to catch the Broadcasted signal:
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
// Sets the View of the Activity
setContentView(R.layout.activity_layout);
registerReceiver(new CustomReceiver(this), new IntentFilter("SEND_DATA"));
}
With the following customreceiver:
public class CustomReceiver extends BroadcastReceiver {
private MyActivity activity;
public ReceiverEvent(MyActivity activity) {
this.activity = activity;
}
public void onReceive(Context context, Intent i) {
this.activity.doWhateverWithYourData(i.getParcelableExtra("newEvent"));
}
}
Note that if you want to transport Objects other than integers, floats and strings, you have to make them Parcelable.