Questoins over function calls in Activity

public class CardsActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}

I could not find the place where onCreate() is called, I want to know where savedInstanceState is passed over to
public void onCreate(Bundle savedInstanceState).
PROs help

 

I don't get it. I thought every function must be called at somewhere, then function will be running. But in here public void onCreate(Bundle savedInstanceState) just run automatically?

package my.Dialog;

import android.app.Activity;
import android.os.Bundle;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class DialogActivity extends Activity {
CharSequence[] items = {"Google" , "Apple", "Bean"};
boolean [] itemsChecked = new boolean [items.length];
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

Button btn = (Button) findViewById(R.id.btn_dialog);
btn.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {
// TODO Auto-generated method stub
showDialog(0);
}
});
}

@Override
protected Dialog onCreateDialog(int id){
switch (id){
case 0:
return new AlertDialog.Builder(this)
.setIcon(R.drawable.ic_launcher)
.setTitle("This is a dialog with some simple text...")
.setPositiveButton("OK",
new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog,
int whichButton)
{
Toast.makeText(getBaseContext(),
"OK clicked!", Toast.LENGTH_SHORT).show();
}
})
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog,
int whichButton)
{
Toast.makeText(getBaseContext(),
"Cancled clicked!", Toast.LENGTH_SHORT).show();
}
})
.setMultiChoiceItems(items, itemsChecked, new
DialogInterface.OnMultiChoiceClickListener() {
public void onClick(DialogInterface dialog, int which,
boolean isChecked) {
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(),
items[which] + (isChecked ? " checked!":
" unchecked!"),
Toast.LENGTH_SHORT).show();
}
}
).create();
}
return null;
}
}

Like this code I dont see any call statement for
protected Dialog onCreateDialog(int id) either.

 

Code (Text):

1. import android.app.Activity;
2. import android.os.Bundle;
3. import android.app.AlertDialog;
4. import android.app.Dialog;
5. import android.content.DialogInterface;
6. import android.view.View;
7. import android.widget.Button;
8. import android.widget.Toast;
9.  
10. public class DialogActivity extends Activity {
11.     CharSequence[] items = {"Google" , "Apple", "Bean"};
12.     boolean [] itemsChecked = new boolean [items.length];
13.     /** Called when the activity is first created. */
14.     @Override
15.     public void onCreate(Bundle savedInstanceState) {
16.         super.onCreate(savedInstanceState);
17.         setContentView(R.layout.main);
18.        
19.         Button btn = (Button) findViewById(R.id.btn_dialog);
20.         btn.setOnClickListener(new View.OnClickListener() {
21.            
22.             public void onClick(View v) {
23.                 // TODO Auto-generated method stub
24.                 showDialog(0);
25.             }
26.         });
27.     }
28.  
29. @Override
30. protected Dialog onCreateDialog(int id){
31.     switch (id){
32.     case 0:
33.         return new AlertDialog.Builder(this)
34.         .setIcon(R.drawable.ic_launcher)
35.         .setTitle("This is a dialog with some simple text...")
36.         .setPositiveButton("OK",
37.                 new DialogInterface.OnClickListener(){
38.                 public void onClick(DialogInterface dialog,
39.                 int whichButton)
40.                 {
41.                     Toast.makeText(getBaseContext(),
42.                             "OK clicked!", Toast.LENGTH_SHORT).show();
43.                 }
44.         })
45.         .setNegativeButton("Cancel",
46.                 new DialogInterface.OnClickListener(){
47.             public void onClick(DialogInterface dialog,
48.             int whichButton)
49.             {
50.                 Toast.makeText(getBaseContext(),
51.                         "Cancled clicked!", Toast.LENGTH_SHORT).show();
52.             }
53.         })
54.         .setMultiChoiceItems(items, itemsChecked, new
55.                 DialogInterface.OnMultiChoiceClickListener() {
56.                     public void onClick(DialogInterface dialog, int which,
57.                             boolean isChecked) {
58.                         // TODO Auto-generated method stub
59.                         Toast.makeText(getBaseContext(),
60.                                 items[which] + (isChecked ? " checked!":
61.                                 " unchecked!"),
62.                                 Toast.LENGTH_SHORT).show();
63.                     }
64.                 }
65.         ).create();
66.     }
67.     return null;
68. }
69. }
70.  

So protected Dialog onCreateDialog(int id) is called by android too? What kind of functions is called by Android?

 

Code (Text):

1. .setPositiveButton("OK",
2.                   new DialogInterface.OnClickListener(){
3.                  public void onClick(DialogInterface dialog,                
4. int whichButton)
5.                  {
6.                      Toast.makeText(getBaseContext(),
7.                              "OK clicked!", Toast.LENGTH_SHORT).show();
8.                  }
9.          })

What it means by "new" and "this"? I kinda remember the "this" means current something.

 

thanks jiminaus, the information is very helpful

Code (Text):

1. .setPositiveButton("OK",
2.                 new DialogInterface.OnClickListener(){
3.                 public void onClick(DialogInterface dialog,
4.                 int whichButton)
5.                 {
6.                     Toast.makeText(getBaseContext(),
7.                             "OK clicked!", Toast.LENGTH_SHORT).show();
8.                 }
9.         })

I dont understand how things work after "OK", need a "English" version of it lol.
You could create methods in middle of a line?

and in the following line what is the "context" means?
Toast.makeText(getBaseContext(),
"OK clicked!", Toast.LENGTH_SHORT).show();

 

Code (Text):

1. new DialogInterface.OnClickListener(){
2.                 public void onClick(DialogInterface dialog,
3.                 int whichButton)
4.                 {
5.                     Toast.makeText(getBaseContext(),
6.                             "OK clicked!", Toast.LENGTH_SHORT).show();
7.                 }
8.         }
9.  

Is this means adding

Code (Text):

1. Toast.makeText(getBaseContext(),
2.                             "OK clicked!", Toast.LENGTH_SHORT).show();

to onClick in DialogInterface.OnClickListener() funciton?

 

interface- means the things showing on screen

This is what I found on websites for inner class:
inner class- declared inside the body of a method is known as the local inner classes. The class declared inside the body of a method without naming it is known as anonymous inner classes.
but dont know how those work.

and setPostiveButton(CharSequence, DialogInterface.OnClickListener) put CharSequence on the button, DialogInterface.OnClickListener is the things u want to happen when the button is clicked.

 

Haha, I think I jumping too much. thx guys