Android查询给定电子邮件id的电子邮件

import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.provider.ContactsContract.CommonDataKinds.Email;

public class EmailUtils {
    public static String getEmailById(Context context, long emailId) {
        ContentResolver contentResolver = context.getContentResolver();
        Uri emailUri = Uri.withAppendedPath(Email.CONTENT_URI, String.valueOf(emailId));

        String[] projection = {Email.ID, Email.FROM, Email.SUBJECT};
        String selection = Email._ID + "=?";
        String[] selectionArgs = {String.valueOf(emailId)};
        String sortOrder = null;

        Cursor cursor = contentResolver.query(emailUri, projection, selection, selectionArgs, sortOrder);

        String email = null;
        if (cursor != null && cursor.moveToFirst()) {
            int fromIndex = cursor.getColumnIndex(Email.FROM);
            email = cursor.getString(fromIndex);
            cursor.close();
        }

        return email;
    }
}