Databases
StackOverflow2013
Postsdbo
POEfficiently filter an ArrayList in Java/Android
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POEfficiently filter an ArrayList in Java/Android
    primarykey
    data
    text
    <p>I'm developing an Android app (Android 1.6), but this is probably a more general Java question.</p> <p>I have an ArrayList of about 10,000 objects</p> <p>the objects contain 3 strings (firstName, middleName, lastName).</p> <p>The user is presented with a "search box" on android where they can search for a particular "object" by typing in part of the name.</p> <p>I have a class (which I call Filterer) that searches through the list of 10,000 for matching objects and then returns them as a "sublist".</p> <p>The search is a little bit SLOW (especially on an Android handset) and I'm sure I'm not doing the search/filtering in the most efficient manner possible.</p> <p>Does anyone have any suggestions on how to speed up my search? My code is below. One possibility to to search against a secondary "masterList" that already has every piece of information in lowercase and concatenated…but there may be additional ways to improve this search that would also help.</p> <p>TIA!!</p> <pre><code>public void filterNames() { this.filteredList.clear(); String sv = this.searchString.toString.trim().toLowerCase(); // search value for (int i = 0; i &lt; this.masterList.size(); i++) { MyObject d = this.masterList.get(i); String fn = d.getFirstName().toString().toLowerCase(); String mn = d.getMiddleName().toString().toLowerCase(); String ln = d.getLastName().toString().toLowerCase(); if (fn.indexOf(sv) &gt;= 0 || md.indexOf(sv) &gt;= 0 || ln.indexOf(sv) &gt;= 0) { this.currentList.add(d); } } } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USBranislav Abadjimarinov
    1. USuser141146
    plurals
    1. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POEfficiently filter an ArrayList in Java/Android
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POEfficiently filter an ArrayList in Java/Android
      1. USWildWezyr
      1. VTFavorite
    3. VO
      singulars
      1. POEfficiently filter an ArrayList in Java/Android
      1. This table or related slice is empty.
      1. VTUpMod
    1. COLook here for similar problem: http://stackoverflow.com/questions/2085445/fast-index-for-contains-string it is asked with c++ in mind, but general solution (data structures and algorithms) is language independent.
      singulars
      1. POEfficiently filter an ArrayList in Java/Android
      1. USWildWezyr
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload