Develop Reference

What should I pass to this Intent constructor inside an event listener?

I am new to Android development and I am trying to start another activity when the user clicks on an item in a ListView. However, I am stuck trying to create an Intent to do it. I am trying to follow this guide, where they use the this keyword. However, it doesn't work in this case because this refers to the AdapterView.onItemClickListener.
My current code is this:
list.setOnItemClickListener(
new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapter,
View item, int pos, long id) {
Intent intent = new Intent(this, OtherActivity.class);
// use the Intent to start another activity...
}
});
What should I be replacing this with?

use your activity name before this, example:
Intent intent = new Intent(MainActivity.this, OtherActivity.class);

how to open a webpage, fill an html form, submit it, get the form's result and then post the information to another activity in android

We have an aspx page with a form in it and we can only process this form in a browser-based environment (ie we cannot create a web service for it.
What we want to do is that we want to process this information in an android application. We want to send some initial data to this page, let the user fill it, submit the form, and then return the results to the calling activity, so we can show a proper message and act accordingly.
let me give an example for this usecase:
We are in activity A and in this activity we have a button that triggers the start of our journey:
//we are in activity A
mOurButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(ActivityA.this, ActivityB.class);
intent.putExtra("additional_data_we_need", adittionalData);
startActivityForResult(intent, REQUEST_CODE);
}
});
Now we are in activity B and here, we should comunicate with that webpage that I was talking about, passing it the additionalData that is in this activity's extra bundle (it is acceptable if we do it using query strings or any other way).
After the user fills the form, and hit submit,we do some operation on it and return some results to another (web)page or in the current (web)page's postback (again it is acceptable if we use query strings, post method or any other way; whicever way that works for this senario). We get this returned result in android side and then get the result to ActivityA :
//we are in acitivity B
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
int adittionalData = getIntent().getExtras().getIntExtra("adittional_data_we_nedd");
//this is the first place that I don't know what to do
callTheWebPageAndGiveItTheData(adittionalData);
}
public void SomeListenerOfTheReturnedDataFromTheWebpage(Bundle returnedData //doesn't necessarily need to be of bundle type) {
intent intent = new Intent();
intent.putExtra("return_bundle", returnedData);
setResult(Activity.RESULT_OK, intent);
finish();
}
What can I do to achieve this goal?
Thanks in advance for your kind answers

How to refer to a randomly generated button's elements

I need to randomly generate a button and then grab elements from it from the activity that the button opens. Specifically the universal ID of a "character" that I have specified in PersistentData. (That whole class works fine, though. The problem is between this activity and the next.) The child activity has multiple activities that can call it. (There are several activities with lists made from different characters from a pool, and each list has these buttons that are shown below, which all point to the same activity that loads information from PersistentData based on the data that its supposed to pull from said button.) The following 1 block of code is in the onCreate method for this activity. (Automatically generated, I just added this in after I called the layouts from the XML file)
for (fID = 0; fID < PersistentData.fName.size(); fID++) {
if (PersistentData.fName.get(fID) != null) {
Button[] Btn = new Button[PersistentData.fName.size()];
Btn[fID].setHeight(200);
Btn[fID].setWidth(200);
Btn[fID].setTextSize(40);
Btn[fID].setText(PersistentData.fName.get(fID));
Btn[fID].setTag(fID);
Layout.addView(Btn[fID]);
Btn[fID].setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int btnID = fID;
gotoActivity(v);
}
});
} else continue;
}
Here is gotoActivity(). (In the class, not onCreate)
public void gotoActivity(View view) {
Intent intent = new Intent(this, TargetActivity.class);
startActivity(intent);
intent.putExtra("btnClicked", /*IDK WHAT TO PUT RIGHT HERE*/);
}
I have put several things there, actually. Mostly, they have been various ways of declaring a variable on the creation of the button.
Here's the TargetActivity.class
public class Fighter extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fighter);
Intent intent = getIntent();
Bundle bundle =
intent.getExtras(); //line ***
**
TextView viewName = (TextView) findViewById(R.id.fighterName);
viewName.setText(PersistentData.fName.get(fID));
}
}
What should I put in the other class that I should get here**? (fID) is the thing that I'm trying to get. I have tried putting and getting fID using the methods as described in the Create an Activity page from Android and it continued to give me a NullPointerException at line *** (I split the line to be precise.)
Any help is appreciated. I would not be surprised if there is a better way to do this, requiring me to scrap all my work and restart. I would prefer not to, though lol. I will be checking this post periodically throughout the day, so if you have any questions or require more detail, just post or message me. Thank you beforehand.

I think the reason you got a NullPointerException because you started the activity before persing the extra.
In the gotoActiviy, make sure the extra(s) method are called before you start the activity. that is
public void gotoActivity(View view) {
Intent intent = new Intent(this, TargetActivity.class);
intent.putExtra("btnClicked", "Strings");
startActivity(intent);
}
As you can see, a string was the extra, you can put any variable type as the extra just make sure at the activity being called, the same variable type gets the extra.
as an example
String getValue = getIntent().getExtras().getString("btnClicked");
Int getValue = getIntent().getExtras().getInt("btnClicked");
/** If integer was the value activity extra */

Take the information inside a ListItem and send it to the next Activity

I am relatively new to the Eclipse & ADT plugin world, so any answers can you please explain what it's doing? It would be very helpful.
Basically, I have a list in one activity that will be populated by a HTTP request from a database API, this I am still working on. However, what I wish to know, is am I able to take the string in the ListItem and give that to a TextView in the next activity?
So for example, I tap 'Record 1' and it takes 'Record 1' and puts it inside a variable, then sends the user to the next screen, and inserts the variable into a TextView. Is this possible?
Thank you.

Get what you want from the adapter, then put that into the Intent that starts the new activity:
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String string = parent.getAdapter().getItem(position);
Intent intent = new Intent(this, nextActivity.class);
intent.putExtra("text", string);
startActivity(intent);
}
});
In the new Activity you then get the Intent that started the new Activity and get the String you put into it:
String data = getIntent().getStringExtra("text");

Implement the setOnItemClickListener() for the listItem where you will capture the listItem clicked and the String you require and then using intent.putExtra(String id, STRING_VALUE) you can pass your string to the next activity.

Yes, it is possible.
You can send information to another activity using Extra. See this code below:
Intent i = new Intent(this, NoteEdit.class);
i.putExtra(NotesDbAdapter.KEY_ROWID, id);
startActivityForResult(i, ACTIVITY_EDIT);
You use putExtra to put your data do you want to send to the activity. In the example NotesDbAdapter.KEY_ROWID is the name you give to access the data and id is the data itself.
And, this is how you can get the data from the activity:
Bundle extras = getIntent().getExtras();
mRowId = (extras == null) ? null : extras.getLong(NotesDbAdapter.KEY_ROWID);

Passing data between activities

I have the following code:
chart.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
final String aux= (String) lt.getItemAtPosition(position);
Intent myIntent = new Intent(infoList.this, tabList.class);
startActivity(myIntent);
}
});
I also have a ListView. When I click on an item from that ListView I navigate to another activity that shows me the info for that activity. How do I do that? I want that info to correspond to the item I clicked.

Here is what I did in this situation, if you don't want to just pass an id back:
I call the other activity with this:
Intent intent = new Intent(myapp, CreateExerciseActivity.class);
intent.putExtra("selected_id", workout.getId());
startActivityForResult(intent, CREATE_ACTIVITY);
I then do
Intent returnIntent = new Intent();
returnIntent.putExtra("name", m.getName());
returnIntent.putExtra("unit", m.getUnit());
returnIntent.putExtra("quantity", m.getQuantity());
if (getParent() == null) {
setResult(Activity.RESULT_OK, returnIntent);
} else {
getParent().setResult(Activity.RESULT_OK, returnIntent);
}
finish();
So, in this case I was passing in an id in order to get more details from the user, and then I pass those back to the calling activity, in order to add it, as I didn't want to save this until the user chooses to later.
So, you need to do startActivityForResult in order to have it able to return the data.

You can add some data to the Intent with the methods putExtra(), and then retrieve the data in the new Activity with getExtras().getSomething().

i guess you have to use OnItemClickListener instead of the click event and you need intent to call the next activity.
private OnItemClickListener mMessageClickedHandler = new OnItemClickListener() {
public void onItemClick(AdapterView parent, View v, int position, long id)
{
Intent intent = new Intent(this, MyInfoActivity.class);
intent.putExtra("selected_id", getIdFor(position));
startActivity(intent);
}
};
mHistoryView = (ListView)findViewById(R.id.history);
mHistoryView.setOnItemClickListener(mMessageClickedHandler);

Possible answer: How do I pass data between Activities in Android application?
http://thedevelopersinfo.wordpress.com/2009/10/15/passing-data-between-activities-in-android/

It really depends on what the data is in your listview. For example, if you're displaying a list of contacts in the listview, you could just pass the ID of the contact over to the other activity, and let that activity access the content provider for contacts to retrieve the data you want it to work with. You'd pass an ID within a URI in the data field of the intent, as opposed to in the extras bundle.