import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.provider.ContactsContract;
import android.telephony.PhoneNumberUtils;
import android.util.Log;
import java.util.HashMap;

// 定义联系人类
public class Contact {
    private static HashMap<String, String> sContactCache;
    private static final String TAG = "Contact";
    // 定义字符串 CALLER_ID_SELECTION
    private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + ContactsContract.CommonDataKinds.Phone.NUMBER + ",?) AND " + ContactsContract.Data.MIMETYPE + "='" + ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE + "'" + " AND " + ContactsContract.Data.RAW_CONTACT_ID + " IN "
            + "(SELECT raw_contact_id "
            + " FROM phone_lookup"
            + " WHERE min_match = '+')";

    // 定义获取联系人的方法
    public static String getContact(Context context, String phoneNumber) {
        if (sContactCache == null) {
            sContactCache = new HashMap<>();
        }
        // 查找 HashMap 中是否已有 phoneNumber 信息
        if (sContactCache.containsKey(phoneNumber)) {
            return sContactCache.get(phoneNumber);
        }
        String selection = CALLER_ID_SELECTION.replace("+",
                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
        // 查找数据库中 phoneNumber 的信息
        Cursor cursor = context.getContentResolver().query(
                ContactsContract.Data.CONTENT_URI,
                new String[]{ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME},
                selection,
                new String[]{phoneNumber},
                null);
        // 判定查询结果
        // moveToFirst() 返回第一条
        if (cursor != null && cursor.moveToFirst()) {
            try {
                // 找到相关信息
                String name = cursor.getString(0);
                sContactCache.put(phoneNumber, name);
                return name;
            } catch (IndexOutOfBoundsException e) {
                // 异常
                Log.e(TAG, " Cursor get string error " + e.toString());
                return null;
            } finally {
                cursor.close();
            }
        } else {
            // 未找到相关信息
            Log.d(TAG, "No contact matched with number:" + phoneNumber);
            return null;
        }
    }
}