ContentProvider contentresolver contentobserver content: Provide, access, monitor

Content offers

public class Personcontentprovider extends contentprovider{

private static final String authority = "Com.itheima28.sqlitedemo.providers.PersonContentProvider" ;
private static final int Preson_insert_code = 0; URI matching code for actions added by the person table

Urimatcher Urimatcher;

Private personsqliteopenhelper mopenhelper;

static{

Urimatcher = new Urimatcher (urimatcher.no_match);

Urimatcher. Adduri (authority, "Person/insert", preson_insert_code);

}

@Override
public Boolean onCreate () {
mopenhelper = new Personsqliteopenhelper (GetContext ());
return true;
}

@Override
Public URI insert (URI uri, contentvalues values) {

Switch (Urimatcher.match (URI)) {
Case Preson_insert_code://Add people to person table
Sqlitedatabase db = Mopenhelper.getwritabledatabase ();

if (Db.isopen ()) {

Long id = db.insert ("person", null, values);

Db.close ();

Return Contenturis.withappendedid (URI, id);
}
Break
Default
throw new IllegalArgumentException ("uri mismatch:" + URI);
}
return null;
}

}

Urimatcher

Content access

contentresolver resolver = GetContext (). Getcontentresolver ();

URI = resolver. Insert (URI, values);

int count = Resolver. Delete (URI, where, Selectionargs);

int count = Resolver. Update (URI, values, "_id =?", New string[]{"20"});

cursor cursor = resolver. Query (URI, new string[]{"_id", "name", "age"}, NULL, NULL, "_id desc");

Content Monitoring

Resolver. Registercontentobserver   (Uri.parse ("content://sms/"), True, new mycontentobserver(New Handler ())); Register for content Monitoring

Class Mycontentobserver extends contentobserver {

private static final String TAG = "Mycontentobserver";

Public Mycontentobserver (Handler Handler) {

Super (handler);

}

/** * Callback when the content being monitored is changed */

@Override

public void OnChange (Boolean selfchange) {

LOG.I (TAG, "SMS Changed");

Uri uri = uri.parse ("Content://sms/outbox"); The URI of the Outbox//Query the contents of the Outbox

cursor cursor = getcontentresolver (). Query (URI, new string[]{"Address", "date", "Body"}, NULL, NULL, NULL);

if (cursor! = NULL && cursor.getcount () > 0) {String address;     Long date; String body;

while (Cursor.movetonext ()) {address = cursor.getstring (0);      Date = Cursor.getlong (1); BODY = cursor.getstring (2);

LOG.I (TAG, "number:" + address + ", Date:" + Date + ", content:" + body); }

Cursor.close ();

}   }  }

ContentProvider contentresolver contentobserver content: Provide, access, monitor