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如何知道哪些具体接触是在甲体内更新的?
原标题:How to know which specific contact was updated in android?

我收到了一份一般性通知,“联系银行有改动”,但我想知道插入、更新或删除的具体记录。

我不想使用URI的“眼光”概念,因为我不想单独为每次接触建立URI。 我想有一个通用的解决办法,我知道何时更新或删除任何接触。

问题回答

您可以实施<代码> <>服务/代码>,以观察数据库状况。

import android.app.Service;
import android.content.Intent;
import android.database.ContentObserver;
import android.database.Cursor;
import android.os.Handler;
import android.os.IBinder;
import android.provider.ContactsContract;

public class ContactService extends Service {

private int mContactCount;

@Override
public IBinder onBind(Intent arg0) {
    return null;
}

@Override
public void onCreate() {
    super.onCreate();
    mContactCount = getContactCount();
    this.getContentResolver().registerContentObserver(
            ContactsContract.Contacts.CONTENT_URI, true, mObserver);
}

private int getContactCount() {
    Cursor cursor = null;
    try {
        cursor = getContentResolver().query(
                ContactsContract.Contacts.CONTENT_URI, null, null, null,
                null);
        if (cursor != null) {
            return cursor.getCount();
        } else {
            return 0;
        }
    } catch (Exception ignore) {
    } finally {
        if (cursor != null) {
            cursor.close();
        }
    }
    return 0;
}

private ContentObserver mObserver = new ContentObserver(new Handler()) {

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

        final int currentCount = getContactCount();
        if (currentCount < mContactCount) {
            // DELETE HAPPEN.
        } else if (currentCount == mContactCount) {
            // UPDATE HAPPEN.
        } else {
            // INSERT HAPPEN.
        }
                    mContactCount = currentCount;
    }

};

    @Override
public int onStartCommand(Intent intent, int flags, int startId) {
    return START_STICKY;
}

@Override
public void onDestroy() {
    super.onDestroy();
    getContentResolver().unregisterContentObserver(mObserver);
 }

}

我以以下方式处理这一问题:

在安装我的当地非行联络桌时,正由特定时间的接触启动。 然后,所有电话都由1名Listner跟踪:如果用户收到/收货单,如果数字载于目前用户的电话簿,那么我就可以检索所有与该号码相关的联系信息,并更新我的当地银行。





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