I'm just learning Java and here I'm presented with this strange error message. In the code below:
while (phones_cursor.moveToNext())
{
String name = phones_cursor.getString(phones_cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
}
Log.wtf("Name: ", name);
I'm get this message saying that "name" cannot be resolved to a variable. So I suppose name is local to the while loop. I wonder now however, how do I get this variable out of the while loop?
define the variable outside of the loop
String name = null;
while (phones_cursor.moveToNext())
{
name = phones_cursor.getString(phones_cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
}
Log.wtf("Name: ", name);
this is because every block (starting with { and ending with }) has it's own scope. but inner scope can access variables from outer scopes.
phone_cursor entries, but will only keep and print the value of the last entry.You have to define your variable outside the loop:
String name = null;
while (phones_cursor.moveToNext())
{
name = phones_cursor.getString(phones_cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
}
Log.wtf("Name: ", name);
Those variable is out of scope.
In java the scope is restricted to {}.
Just move that variable declaration to top, so that they available further.
String name = null;
while (phones_cursor.moveToNext())
{
name = phones_cursor.getString(phones_cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
}
Log.wtf("Name: ", name);
Prefer to read : Block and Statements
