Android: What does ContentResolver.update() do excactly?

Question

I want to use the method ContentResolver.update(Uri uri, ContentValues values, String where, String[] selectionArgs) I know how to use it, but I wonder what it does with the ContentValues. Does it overwrite ALL existing ContentValues, or does it only overwrite the given ContentValues?

So for example, these ContentValues exist:

A: abc
B: 123
C: 456

And the ContentValues in the update()method contain this:

A: asdf
C: 789

Then will the new ContentValues be: (only overwrite given values)

A: asdf
B: 123
C: 789

Or will it be: (overwrite all values)

A: asdf
C: 789

This is my code:

 contentResolver.update(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, values, "_data=" + audioFilePath, null);

In which values contains the ContentValues that should be overwritten and audioFilePath contains the path to the audiofile (which is the value of _data).

Answer 1

It will only overwrite the given ContentValues.

Answer 2

As per the documentation, all the ContentResolver.update() method does is call the update method of the ContentProvider that you've defined and identified by the URI you provide in the first argument.

So, to know exactly what's going on, you need to look at how you defined the update() method of the ContentProvider you are referencing. Take a look at the ContentProvider basics documentation. If you need help properly defining the update() method of your contentProvider, post your code here or ask a question specific to that.