Question

我能够获得一个通用通知“联系人数据库发生了变化”，但我想知道插入，更新或删除的特定记录。以下是注册并获取onChange通知的代码。不幸的是，它并不具体，这使得我的处理功能详尽且效率低下。

这是代码存根：

            if ((mNativeContactsObserver == null) && (mHandler == null)) {
            mHandler = new Handler(this.getMainLooper()) {
            };
            mNativeContactsObserver = new ContentObserver(mHandler) {
                @Override
                public void onChange(boolean selfChange) {
                    super.onChange(selfChange);

                    Bundle data = null;
                    Message message = mHandler.obtainMessage();
                    if (message != null) {
                        data = message.getData();
                        if (data != null) {
                            Logs.d(TAG, "Message = [" + message.toString() + "] data=[" + data.toString() + "]");
                            Logs.d(TAG, "Contents = [" + message.describeContents() + "]");
                        }
                    }

                    if (!selfChange) {
                        final Account accountListen = MySyncAdapter.lookupAccount(TAG, getApplicationContext(), getUserProfile().getAccountId(), AUTHORITY_MY_SYNC);
                        Logs.d(TAG, "onChange!? account: " + accountListen.name);
                        if (!ContentResolver.isSyncPending(account, ContactsContract.AUTHORITY) 
                                && (!ContentResolver.isSyncActive(account, ContactsContract.AUTHORITY))) {
                            Bundle extras = new Bundle();
                            extras.putInt(MySyncAdapter.EXTRA_SYNC_TYPE, MySyncAdapter.REQUEST_SYNC_NATIVE_CHANGED);
                            ContentResolver.requestSync(accountListen, ContactsContract.AUTHORITY, extras);
                        } else {
                            Logs.w(TAG, "There is a pending sync.  This request is ignored.");
                        }
                    }
                }
            };
        }
        Uri uriContactsListen = ContactsContract.Contacts.CONTENT_URI.buildUpon().appendEncodedPath("#").build();
        Logs.i(TAG, "Register listening for native contacts changes. [" + uriContactsListen + "]");
        cr.registerContentObserver(uriContactsListen, true, mNativeContactsObserver);

Answer 1

最后至少我能够检测到更新/删除/插入查看我的OnChange方法，如下所示

 @Override
       public void onChange(boolean selfChange) {
           super.onChange(selfChange);
           Log.e("ContactChangeObserver", "onChange");

           // 0 Update , 1 Delete , 2 Added
 // Get count from phone contacts
           final int currentCount = contactDBOperaion.getContactsCountFromPhone();

 // Get count from your sqlite database
           int mContactCount= DbContacts.getInstance().getContactsCount();

           if (currentCount < mContactCount) {
               // DELETE HAPPEN.
               Log.e("Status", "Deletion");
               contactDBOperaion.SyncContacts(1);
           } else if (currentCount == mContactCount) {
               // UPDATE HAPPEN.
               contactDBOperaion.SyncContacts(0);
           } else {
               // INSERT HAPPEN.
               Log.e("Status", "Insertion");
               contactDBOperaion.SyncContacts(2);
           }
       }

发生更新时，我会更新所有联系人

发生插入时，我检查后插入新添加的行   isExist在现有数据库中

删除时未找到解决方案

Answer 2

我的应用程序基类中有这段代码。

private ContentObserver contactObserver = new ContactObserver();

private class ContactObserver extends ContentObserver {

    public ContactObserver() {
        super(null);
    }

    @Override
    public void onChange(boolean selfChange) {
        super.onChange(selfChange);

        // Since onChange do not sent which user have been changed, you 
        // have to figure out how to match it with your data.
        // Note: Contact is  one of my classes.
        for (Contact contact : getContacts()) {
            if (!contact.isLinked())
                continue;

            String selection = ContactsContract.Data._ID + " = ?";
            String[] selectionArgs = new String[] { contact.getSystemId() };
            String[] projection = new String[] { ContactsContract.Data.DISPLAY_NAME };
            Cursor cursor = getContentResolver().query(
                    ContactsContract.Contacts.CONTENT_URI, projection,
                    selection, selectionArgs, null);

            if (!cursor.moveToFirst())
                return;

            String name = cursor.getString(0);

            if (contact.getUsername().equalsIgnoreCase(name))
                continue;

            contact.setUserName(name);

        }
    }
}

关于投射检查here

的内容

Unfortunately, it is not specific which makes my processing exhaustive and inefficient.

如果进入下一个Android版本，也会发送刚刚更改过的联系人ID。

希望这有帮助

Answer 3

首先，您必须注册contentObserver以接收更改通知。

通过致电：

来做到这一点

registerContentObserver();

以下是规格：registerContetObserver

之后你会想要在修改时通知所有听众：

contentResolver.notifyChange();

以下是该规范的规格：notifyChange

希望它有所帮助;）

干杯！

Answer 4

使用加载程序在模拟器上查询并显示Android设备上的联系人列表。它们会自动检测基础数据中的更改并在您的UI上反映出来。

如何让我的Contacts ContentObserver for ContactsContract检测添加，更新或删除的联系人？

4 个答案: