相关疑难解决方法(0)

我在Android中为联系人加载照片时遇到问题.我已经google了一个答案,但到目前为止已经空了.有没有人有查询联系人,然后加载照片的例子？

因此,给定一个来自一个名为using的Activity结果的contactUri

startActivityForResult(new Intent(Intent.ACTION_PICK,ContactsContract.CommonDataKinds.Phone.CONTENT_URI),PICK_CONTACT_REQUEST) 

是:

内容://com.android.contacts/data/1557

loadContact(..)工作正常.但是,当我调用getPhoto(...)方法时,我得到了照片InputStream的空值.它也令人困惑,因为URI值不同.contactPhotoUri评估为:

内容://com.android.contacts/contacts/1557

请参阅下面代码中的内联注释.

 class ContactAccessor {

    /**
     * Retrieves the contact information.
     */
    public ContactInfo loadContact(ContentResolver contentResolver, Uri contactUri) {

        //contactUri --> content://com.android.contacts/data/1557

        ContactInfo contactInfo = new ContactInfo();

        // Load the display name for the specified person
        Cursor cursor = contentResolver.query(contactUri,
                                            new String[]{Contacts._ID, 
                                                         Contacts.DISPLAY_NAME, 
                                                         Phone.NUMBER,
                                                         Contacts.PHOTO_ID}, null, null, null);
        try {
            if (cursor.moveToFirst()) {
                contactInfo.setId(cursor.getLong(0));
                contactInfo.setDisplayName(cursor.getString(1));
                contactInfo.setPhoneNumber(cursor.getString(2));
            }
        } finally {
            cursor.close();
        }        
        return contactInfo;  // <-- returns info for contact
    }

    public Bitmap …

我有点困惑,因为我不知道如何解释这个教程:http://developer.android.com/training/basics/data-storage/databases.html#DbHelper

我的代码到现在看起来像这样:

public final class DatabaseContract {
// To prevent someone from accidentally instantiating the contract class,
// give it an empty constructor.
public DatabaseContract() {}

public static abstract class Table1 implements BaseColumns {
    public static final String TABLE_NAME       = "nameOfTable";
    public static final String COLUMN_NAME_COL1 = "column1";
    public static final String COLUMN_NAME_COL2 = "column2";
    public static final String COLUMN_NAME_COL3 = "column3";
}

public class DatabaseHelper extends SQLiteOpenHelper {
    // If you change the database schema, you …