在android中,从联系人获取数据花费了太多时间

使用异步任务在后台加载联系人。首次加载后,将联系人列表存储到本地数据库中

https://developer.android.com/guide/components/loaders

https://stackoverflow.com/a/40017905/10239870

  class ContactLoader extends AsyncTask<Void, Void, List<Contact>> {
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        //visible your progress bar here
    }

    @Override
    protected List<Contact> doInBackground(Void... voids) {
        List<Contact> contacts = new ArrayList<>();
        String order = ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " ASC";
        Cursor cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, order);
        while (cursor.moveToNext()) {
            String name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
            String phonenumber = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
            contacts.add(new Contact(name, phonenumber));
        }
        cursor.close();
        return contacts;
    }

    @Override
    protected void onPostExecute(List<Contact> contactList) {
        super.onPostExecute(contactList);
        //set list to your adapter
    }
}


  class Contact {
    String name;
    String number;

    public Contact(String name, String number) {
        this.name = name;
        this.number = number;
    }

    public String getName() {
        return name;
    }

    public String getNumber() {
        return number;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setNumber(String number) {
        this.number = number;
    }
}