Question

应用程序需要阅读电话簿联系人并将其显示给用户，手机上有超过8000个联系人。问题是在渲染屏幕上的所有联系人时，它会长时间停留。

请建议完成此任务的最佳方法。感谢

主要方法：

 Cursor contactsCursor = getContentResolver().query(
        ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
LogUtils.d("@@@ cursorCount" + contactsCursor.getCount());
contacts = new ArrayList<ImportContactModel>();
importContactList = new ArrayList<ImportContactModel>();
showProgressDialog();
asyncLoader = new AsyncTask<Void, Void, Void>() {

    @Override
    protected Void doInBackground(Void... params) {
        fetchContacts();
        return null;
    }

    protected void onPostExecute(Void result) {
        // create an array of Strings, that will be put to our
        // ListActivity
        adapter = new ImportContactArrayAdapter(
                ImportContactSelection.this, contacts);
        contactList.setAdapter(adapter);
        contactList.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        initSearch();
        dismissProgressDialog();
    };

}.execute();

获取数据的类：

 public void fetchContacts() {

String phoneNumber = null;
String email = null;

Uri CONTENT_URI = ContactsContract.Contacts.CONTENT_URI;
String _ID = ContactsContract.Contacts._ID;
String DISPLAY_NAME = ContactsContract.Contacts.DISPLAY_NAME;
String HAS_PHONE_NUMBER = ContactsContract.Contacts.HAS_PHONE_NUMBER;
String PROFILE_PIC = ContactsContract.CommonDataKinds.Phone.PHOTO_URI;

Uri PhoneCONTENT_URI = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
String Phone_CONTACT_ID = ContactsContract.CommonDataKinds.Phone.CONTACT_ID;
String NUMBER = ContactsContract.CommonDataKinds.Phone.NUMBER;

Uri EMAIL_CONTENT_URI = ContactsContract.CommonDataKinds.Email.CONTENT_URI;
String EMAIL_CONTACT_ID = ContactsContract.CommonDataKinds.Email.CONTACT_ID;
String EMAIL = ContactsContract.CommonDataKinds.Email.DATA;

ContentResolver contentResolver = getContentResolver();
Cursor cursor = contentResolver.query(CONTENT_URI, null, null, null,
        null);

// Loop for every contact in the phone
if (cursor.getCount() > 0) {

    while (cursor.moveToNext()) {
        ImportContactModel tempContact = new ImportContactModel();
        String contact_id = cursor
                .getString(cursor.getColumnIndex(_ID));
        String name = cursor.getString(cursor
                .getColumnIndex(DISPLAY_NAME));
        String image_uri = cursor.getString(cursor
                .getColumnIndex(PROFILE_PIC));
        int hasPhoneNumber = Integer.parseInt(cursor.getString(cursor
                .getColumnIndex(HAS_PHONE_NUMBER)));

        if (hasPhoneNumber > 0) {

            tempContact.setId(contact_id);
            if (image_uri != null)
                tempContact.setProfilePic(cursor.getString(cursor
                        .getColumnIndex(PROFILE_PIC)));
            else
                tempContact.setProfilePic("");
            tempContact.setContactName(name);
            // Query and loop for every phone number of the contact
            Cursor phoneCursor = contentResolver.query(
                    PhoneCONTENT_URI, null, Phone_CONTACT_ID + " = ?",
                    new String[] { contact_id }, null);

            // Get All Phone Numbers
            while (phoneCursor.moveToNext()) {
                phoneNumber = phoneCursor.getString(phoneCursor
                        .getColumnIndex(NUMBER));
                tempContact.setContactNo(phoneNumber);
                break;
            }
            phoneCursor.close();

            Cursor emailCursor = contentResolver.query(
                    EMAIL_CONTENT_URI, null, EMAIL_CONTACT_ID + "=?",
                    new String[] { contact_id }, null);
            while (emailCursor.moveToNext()) {
                String contactId = emailCursor.getString(emailCursor
                        .getColumnIndex(EMAIL_CONTACT_ID));
                email = emailCursor.getString(emailCursor
                        .getColumnIndex(EMAIL));
                tempContact.setEmail(email);
                break;
            }
            emailCursor.close();
            contacts.add(tempContact);
        }
    }
}

} 适配器类

   public class ImportContactArrayAdapter extends ArrayAdapter<ImportContactModel> {

  private final List<ImportContactModel> list;
  private final Activity context;
  private ImageLoader mImageLoader;

  public ImportContactArrayAdapter(Activity context, List<ImportContactModel> list) {
super(context, R.layout.item_task_contact_select, list);
this.context = context;
this.list = list;
this.mImageLoader = ImageLoader.getInstance();
 }

 static class ViewHolder {
protected ImageView profilePic;
protected TextView contactName;
protected TextView contactNo;
protected CheckBox checkbox;
}

 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
  View view = null;
  if (convertView == null) {
  LayoutInflater inflator = context.getLayoutInflater();
  view = inflator.inflate(R.layout.item_task_contact_select, null);
  final ViewHolder viewHolder = new ViewHolder();
  //viewHolder.profilePic = (ImageView) view.findViewById(R.id.img_import_profilePic);
  viewHolder.contactName = (TextView) view.findViewById(R.id.name_text);
  viewHolder.contactNo = (TextView)view.findViewById(R.id.tag_text_1);
  viewHolder.contactNo.setVisibility(View.VISIBLE);
  viewHolder.contactNo.setTextSize(11);
  viewHolder.checkbox = (CheckBox) view.findViewById(R.id.select_checkbox);
  viewHolder.checkbox.setClickable(true);
  viewHolder.checkbox
      .setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView,
            boolean isChecked) {
            ImportContactModel element = (ImportContactModel) viewHolder.checkbox
              .getTag();
          element.setSelected(buttonView.isChecked());

        }
      });
  view.setTag(viewHolder);
  viewHolder.checkbox.setTag(list.get(position));
} else {
  view = convertView;
  ((ViewHolder) view.getTag()).checkbox.setTag(list.get(position));
}
ViewHolder holder = (ViewHolder) view.getTag();
ImageView avatar = (ImageView) view.findViewById(R.id.img_avatar);
ImageView avatarBorder = (ImageView) view.findViewById(R.id.img_avatar_overlay);
ProgressBar avatarProgress = (ProgressBar) view.findViewById(R.id.img_avatar_progress);

if(!list.get(position).equals(""))
//holder.profilePic.setImageURI(Uri.parse(list.get(position).getProfilePic()));
mImageLoader.displayImage(list.get(position).getProfilePic(), avatar, new    AvatarsImageLoadingListener(avatarProgress, avatarBorder, R.drawable.bg_nophoto));
holder.contactName.setText(list.get(position).getContactName());
holder.contactNo.setText(list.get(position).getContactNo());
holder.checkbox.setChecked(list.get(position).isSelected());
return view;
   }

 public ArrayList<ImportContactModel> getCheckList(){
  ArrayList<ImportContactModel> tempList = new ArrayList<ImportContactModel>();
  for(int i=0;i<list.size();i++){
      if(list.get(i).isSelected()){
          tempList.add(list.get(i));
          LogUtils.d(""+list.get(i).getContactName());
      }
  }

  return tempList;
 }


}

所以它只显示加载屏幕了很长时间..

Answer 1

您无需提取所有联系人以显示它们。 AsyncTask有publishProgress方法。我没有Cursor课程的经验，因为我更喜欢ORM，因此我会用伪代码编写，你必须自己调整它。

//in AsyncTask
protected Void doInBackground(params){
    while(cursor.moveToNext()){
        contactInfo = createContact(currentCursorValue);
        publishProgress(contactInfo);
    }
}
onProgressUpdate(contactInfo){
    if(adapter==null){
        //first time adapter setup
    }
    adapter.add(contactInfo);
    adapter.notifyDataSetChanged();
}

这样，每次从Db中提取记录时，都会将其发布，并且会不断添加项目。用户不会注意到任何延迟，除非他尝试搜索尚未存在的项目，或者您想要实现快速滚动的大弹出信件。尽管如此，上面的代码并不是非常有效，因为每隔0.001秒左右发布一次进度并不是很聪明，所以你可以发布每20个结果，或者每秒发布一次，直到你。

android在应用程序中有8000个联系人呈现

1 个答案: