Question

在我的应用程序中，我有一个listView，显示员工，每个项目都有自己的名字，电子邮件和缩略图。一切正常，但缩略图。我的ArrayAdapter不是将所有员工个人资料图片显示为缩略图，而是这样：

会显示所有默认图片，当用户没有为特定员工选择任何图片时，会自动选择这些图片。（默认图片位于可绘制文件夹中："android.resource://com.witchking.modiryar/" + R.drawable.default_pic;
确实显示最后插入的员工图片为缩略图
如果我回到之前的活动并返回列表，列表将不会显示最后的图片。
如果我有2名或更多员工拥有相同的图片，并且我使用相同的图片再次创建另一名员工，列表将显示所有员工的图片与上次插入的员工图片相同！

这张照片是为了让您更好地了解我所面对的情况：

我的适配器问题：

员工哈利波特添加了默认图片
员工Frodo bagins添加了名为“A”的图片
返回主要活动并返回此活动后的员工清单
员工钢铁侠添加了名为“B”的图片
员工超人再次添加了名为“A”的图片

这是我的代码：

ArrayAdapter getView（）方法：

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View myView = convertView;
    String path ="android.resource://com.witchking.modiryar/" + R.drawable.default_pic;
    Uri uri = null;

    if (myView == null)
    {
        LayoutInflater layoutInflater;
        layoutInflater = LayoutInflater.from(getContext());
        myView = layoutInflater.inflate(R.layout.item_listviewitem, null);
    }

    PersonHandler myPerson = getItem(position);
    if (myPerson != null){
        TextView firstLine = (TextView) myView.findViewById(R.id.firstLine);
        TextView secondLine = (TextView) myView.findViewById(R.id.secondLine);
        ImageView profilePicture = (ImageView) myView.findViewById(R.id.icon);

        if (myPerson.getPersonProfilePictureUrl() != null){
            uri = Uri.parse(myPerson.getPersonProfilePictureUrl());
        }else {
            uri = Uri.parse(myPerson.getPersonProfilePictureUrl());
        }

        firstLine.setText(myPerson.getPersonFullName());
        profilePicture.setImageURI(uri);

        switch (personType)
        {
            case 'S': //person type student
                secondLine.setText(myPerson.getPersonStudentNumber());
                break;
            case 'E': //person type employee
                secondLine.setText(myPerson.getPersonEmail());
                break;
            case 'M': //person type Masters
                secondLine.setText(myPerson.getPersonEmail());
                break;
        }
    }
    return myView;
}

PersonHandler是一个基于不同活动的人员类型处理查询的类。这是getPersonList（）方法：

    public List<PersonHandler> getPersonList(SQLiteDatabase sqldb, char personType){
    Cursor cursor;
    String fullName = null;
    String stdNumber = null;
    String email = null;
    String query = null;
    String path = "android.resource://com.witchking.modiryar/" + R.drawable.exclamation;
    String[] columnName = new String[3];

    List<PersonHandler> listPerson=new ArrayList<PersonHandler>();

    /*
    * dar in ghesmat query motenaseb ba personType
    * ejra migardad
    * query selected by person type
    */

    switch (personType) {
        case 'S':
            query = "select * from " + "tbl_Students";

            break;
        case 'E':
            query = "select * from " + "tbl_Employees";
            break;
        case 'M':
            query = "select * from " + "tbl_Master";
            break;
    }

    cursor = sqldb.rawQuery(query, null);



    /*
    * dar in ghesmat barname check mikonad ke agar cursor khali bood
    * yani hich daneshjoo, karmand, ya ostadi add nashode
    * pas bar asase personType tasmim migirad ke peyghame monaseb ra namayesh dahad
    * checking if cursor is null and displaying proper message
    * the message is added as an item in list
    */

    int cnt = cursor.getCount();

    if (cursor.getCount() <= 0){
        PersonHandler newPerson=new PersonHandler();
        newPerson.setPersonProfilePictureUrl(path);

        switch (personType) {
            case 'S':
                fullName = "هیچ دانشجویی اضافه نشده";
                stdNumber = "از منو گزینه دانشجوی جدید را انتخاب نمایید";
                newPerson.setPersonFullName(fullName);
                newPerson.setPersonStudentNumber(stdNumber);
                break;
            case 'E':
                fullName = "هیچ کارمندی اضافه نشده";
                email = "از منو گزینه کارمند جدید را انتخاب نمایید";
                newPerson.setPersonFullName(fullName);
                newPerson.setPersonEmail(email);
                break;
            case 'M':
                fullName = "هیچ استادی اضافه نشده";
                email = "از منو گزینه استاد جدید را انتخاب نمایید";
                newPerson.setPersonFullName(fullName);
                newPerson.setPersonEmail(email);
                break;
        }

        listPerson.add(newPerson);

        /*
        * dar in ghesmat bar asase personType barname tasmim migirad
        * ke field haye monasb ra bar asase query voroodi az cursor
        * farakhani konad
        * if cursor is not null, app selects proper columns based on person type
        */
    }else {
        cursor.moveToFirst();

        while (!cursor.isAfterLast()){
            PersonHandler newPerson=new PersonHandler();

            switch (personType) {
                case 'S':
                    newPerson.setPersonFirstName(cursor.getString(1));  //First Name Column
                    newPerson.setPersonLastName(cursor.getString(2));   //Last Name Column
                    newPerson.setPersonEmail(cursor.getString(5));      //Email or StudentNumber Column
                    newPerson.setPersonProfilePictureUrl(cursor.getString(7));  //Picture Url Column
                    break;
                case 'E':
                    newPerson.setPersonFirstName(cursor.getString(1));  //First Name Column
                    newPerson.setPersonLastName(cursor.getString(2));   //Last Name Column
                    newPerson.setPersonEmail(cursor.getString(3));      //Email or StudentNumber Column
                    newPerson.setPersonProfilePictureUrl(cursor.getString(7));  //Picture Url Column
                    break;
                case 'M':
                    newPerson.setPersonFirstName(cursor.getString(1));  //First Name Column
                    newPerson.setPersonLastName(cursor.getString(2));   //Last Name Column
                    newPerson.setPersonEmail(cursor.getString(3));      //Email or StudentNumber Column
                    newPerson.setPersonProfilePictureUrl(cursor.getString(7));  //Picture Url Column
                    break;
            }

            newPerson.setPersonFullName(newPerson.getPersonFirstName() + " " + newPerson.getPersonLastName());
            listPerson.add(cursor.getPosition(), newPerson);

            cursor.moveToNext();
            newPerson = null;
        }
    }
    return listPerson;
}

最后我在活动中的onCreate（）方法：

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_employees);
    context = this;
    SQLiteDatabase myDB = openOrCreateDatabase("ModirYar.db", MODE_PRIVATE, null);

    char personType = 'E';

    PersonHandler EmployeePerson = new PersonHandler();
    List<PersonHandler> myPerson = new ArrayList<PersonHandler>();
    myPerson = EmployeePerson.getPersonList(myDB, personType);
    //get the list view reference
    listViewEmployeesList = (ListView) findViewById(R.id.lstView_Employees);

    sampleListAdapter myAdapter = new sampleListAdapter(this, R.layout.item_listviewitem, myPerson);
    myAdapter.personType = personType;
    listViewEmployeesList.setAdapter(myAdapter);

}

我真的很困惑。是什么导致了这个问题？提前谢谢......

Answer 1

尝试使用通用图像加载程序从drawable加载图像。这样的事情：

ImageLoader.getInstance().displayImage(context, "drawable://" + uri, profilePicture);

uri只会包含资源ID。

ArrayAdapter仅在列表视图

1 个答案: