Question

i’m new here so still very blur with some certain things here.
& i’m a bit confuse with following codes.

public class SmsActivity extends ListActivity { 
private String[] mSmsReceiver; 
public SmsActivity(){
mSmsReceiver = new SmsReceived();

setListAdapter(new ArrayAdapter<String>(this, R.layout.main,mSmsReceiver));

my understanding: (should be wrong)

line 1: Class SmsActivity under a superclass ListActivity
line 2: i introduce a string array term name:mSmReceiver
line 3: calling method SmsActivity()
line 4: inside SmsActivity method, mSmsReceiver(a string array) call method SmsReceived
line 5: ArrayAdapter(in string form, loaded with the info. of mSmsReceiver) loaded into setListAdapter

My question:

1. pls correct my understanding upon code above.
2. line 5, what is this refers to?
   (i checked on internet & books, it always says context. but i’m totally no idea what is context exactly means, anyone can explain what is context refering here?)

full codes:

    import...
    ....   

    public class SmsActivity extends ListActivity {
    private String[] mSmsReceiver;
    public SmsActivity(){
    mSmsReceiver = new SmsReceived();

    setListAdapter(new ArrayAdapter<String>(this, R.layout.main,mSmsReceiver));

    ListView listView = getListView();
    listView.setTextFilterEnabled(true);

    //---method is call when listitem is clicked---
    listView.setOnItemClickListener(new OnItemClickListener() {edit later});
    }


    private class SmsReceived extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) 
    {..... }
    }

    }

Answer 1

Basically this is a definition of a class named SmsActivity.

You are right about line 1 and line 2. More precisely, mSmReceiver is a private number of class SmsActivity.

Line 3 should be the constructor which I am not sure because I’m not an android developer and I heard it use onCreate instead in Activity. But anyway it wouldn’t be calling the method just definition of it. The constructor will be used to initialize the class.

And line 4 mSmsReceiver(a string array) call method SmsReceived. Not the case, it would be initialize mSmsReceiver with an object, which is an instance of class SmsReceived.

Line 5 this refers to the class SmsActivity. In classes this almost always refers to the class it’s in. And this provide a context so you can use this.someMumber or this.someFunction.