Android features multiple-selection and full-selection logging based on ListView and CheckBox _android

Application development often has the need to read data from a database display, and then select multiple, full records and deletions. When you're working on a custom system contact, here's a simple example of ListView and checkbox implementations for multiple selections and all selections. The following is the specific code.

The effect is as follows:

Multiselectactivity

/** * multiselectactivity/public class Multiselectactivity extends activity implements Onclicklistener, Onit 
  Emclicklistener {private static final String TAG = "multiselectactivity"; 
  Private ListView contactsdellist; 
  Private Button contactsdelbtn; 
  Private Button contactscancelbtn; 
  Private CheckBox SelectAll; 
  Private Cursor Cursor; 
 
  Private Contactsdeleteadapter Contactsdeleteadapter; 
  private static final string[] projection = new string[] {contacts._id, contacts.display_name}; 
  private static final int contacts_id_index = 0; 
  private static final int display_name_index = 1; 
 
  Private Contactsdeletelistitemviews holderviews; 
    Private Final class Contactsdeletelistitemviews {TextView nameview; 
  CheckBox Delcheckbox; 
    @Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); 
    Setcontentview (r.layout.contacts_delete_activity); Contactsdellist = (ListView) findvIewbyid (r.id.contacts_delete_list); 
    CONTACTSDELBTN = (Button) Findviewbyid (R.ID.CONTACTS_DELETE_BTN); 
    CONTACTSCANCELBTN = (Button) Findviewbyid (R.ID.CONTACTS_CANCEL_BTN); 
    SelectAll = (CheckBox) (Findviewbyid (R.id.contacts_delete_list_header). Findviewbyid (R.id.select_all)); 
    Contactsdellist.setonitemclicklistener (this); 
    Contactsdelbtn.setonclicklistener (this); 
    Contactscancelbtn.setonclicklistener (this); 
  Selectall.setonclicklistener (this); 
    } @Override protected void Onresume () {super.onresume (); 
  RefreshData ();  
        }//Query database private void RefreshData () {cursor = Getcontentresolver (). Query (Contacts.content_uri, projection, 
    NULL, NULL, NULL); 
    Contactsdeleteadapter = new Contactsdeleteadapter (this, cursor); 
  Contactsdellist.setadapter (Contactsdeleteadapter); 
    Class Contactsdeleteadapter extends Baseadapter {Cursor cur; 
    Map<integer, boolean> Selectedmap; Hashset<sTring> Delcontactsidset; 
      Public Contactsdeleteadapter (context context, Cursor c) {cur = c; 
      Saves the status of each record being selected Selectedmap = new Hashmap<integer, boolean> (); 
 
      Save the selected record as id delcontactsidset = new hashset<string> () in the database table; 
      for (int i = 0; i < Cur.getcount (); i++) {Selectedmap.put (I, false); @Override public View getview (int position, View Convertview, ViewGroup parent) {if (CONVERTV Iew = = null) {Convertview = Layoutinflater.from (multiselectactivity.this). Inflate (r.layout.contact 
        S_delete_list_item, NULL); 
        Holderviews = new Contactsdeletelistitemviews (); 
        Holderviews.nameview = (TextView) convertview. Findviewbyid (R.id.name); 
        Holderviews.delcheckbox = (CheckBox) convertview. Findviewbyid (R.id.delete_list_item); 
      Convertview.settag (holderviews); 
     } cur.movetoposition (position); Contactsdeletelistitemviews views = (contactsdeletelistitemviews) convertview. Gettag (); 
      Final String name = cur.getstring (Display_name_index); 
      Views.nameView.setText (name); 
      Views.delCheckBox.setChecked (Selectedmap.get (position)); Save Record ID if (selectedmap.get (position)) {Delcontactsidset.add (string.valueof cur. getInt (CO 
      Ntacts_id_index))); 
      else {delcontactsidset.remove (string.valueof (cur. getInt (Contacts_id_index))); 
    return convertview; 
    @Override public int GetCount () {return cur.getcount (); @Override public Object getitem (int position) {if (cur.movetoposition (position)) {return C 
      ur 
      else {return null; 
    @Override public long getitemid (int position) {return position; 
 @Override public void OnClick (View v) {switch (V.getid ()) {   Case R.id.select_all://Select all CheckBox Click event Handling if (selectall.ischecked ()) {for (int i = 0; ; Contactsdeleteadapter.getcount (); 
          i++) {ContactsDeleteAdapter.selectedMap.put (I, true); 
          Click event: All selected checkbox is checked to add all contact ID to Delcontactsidset contactsDeleteAdapter.cur.moveToPosition (i); ContactsDeleteAdapter.delContactsIdSet.add (String. valueof (contactsdeleteadapter.cur. GE 
        TInt (Contacts_id_index))); 
      } contactsdelbtn.setenabled (True); else {for (int i = 0; i < Contactsdeleteadapter.getcount (); i++) {contactsdeleteadapter.selecte 
        Dmap.put (I, false); 
        //click event: All selected checkbox is canceled check delcontactsidset empty contactsDeleteAdapter.delContactsIdSet.clear (); 
      Contactsdelbtn.setenabled (FALSE); 
      } contactsdeleteadapter.notifydatasetchanged (); 
    Break Case R.id.contacts_delete_btn:new AlerTdialog.builder (This). Settitle (R.string.clearconfirmation_title). Setmessage (R.string.clearconfirma tion). Setnegativebutton (Android. R.string.cancel, NULL). Setpositivebutton (Android. R.string.ok, New Dialoginterface.onclicklistener () {@Override public void OnClick (Dialoginterfa 
                      Ce dialog, int which) {final ProgressDialog ProgressDialog = ProgressDialog. Show ( 
                      Multiselectactivity.this, GetString (R.string.clearprogress_title), 
              "", true, false); 
                Final asynctask<void, void, void> task = new asynctask<void, void, void> () {@Override 
                  protected void Doinbackground (void ... params) {//Delete record event handling (I don't write detailed code here) 
                return null; } @Override protected void onpostexecute (void result) {Progressdialog.dismiss (); 
              } 
              }; 
              Progressdialog.show (); 
            Task.execute (); 
      }). Setcancelable (True). Create (). Show (); 
    Break 
    Case R.ID.CONTACTS_CANCEL_BTN://Cancel event handling break; 
    @Override public void Onitemclick (adapterview<?> arg0, view view, int position, long ID) { 
    LOG.I (TAG, "Onitemclick"); 
    Contactsdeletelistitemviews views = (contactsdeletelistitemviews) view. Gettag (); 
    Views.delCheckBox.toggle (); 
    ContactsDeleteAdapter.selectedMap.put (position, Views.delcheckbox. ischecked ()); 
    Contactsdeleteadapter.notifydatasetchanged (); Determine if a record is not selected in order to modify the Select checkbox Check state if (ContactsDeleteAdapter.selectedMap.containsValue (false)) {SELECTALL.SETC 
    Hecked (FALSE); 
    else {selectall.setchecked (true); //Determine if any records are selected to set the Delete button to be available if (contactsdeleteadapter.selecteDmap.containsvalue (True) {contactsdelbtn.setenabled (true); 
    else {contactsdelbtn.setenabled (false); 
 } 
  } 
}

Layout file: Contacts_delete_activity.xml

<?xml version= "1.0" encoding= "Utf-8"?> <!--zuolongsnail@163.com This layout of delete contacts. --> <linearlayout xmlns:android= "http://schemas.android.com/apk/res/android" android:layout_width= "Match_" Parent "android:layout_height=" match_parent "android:orientation=" vertical "> <include android:id=" @ +id/contacts_delete_list_header "layout=" @layout/contacts_delete_list_header "/> <listview android:id = "@+id/contacts_delete_list" android:layout_width= "match_parent" android:layout_height= "0dip" android:layou 
    t_weight= "1"/> <linearlayout style= "@android: Style/buttonbar" android:layout_width= "Match_parent" android:layout_height= "wrap_content" android:orientation= "horizontal" > <button android:id= "@+" Id/contacts_delete_btn "android:layout_width=" 0dip "android:layout_height=" Wrap_content "Android:layo ut_weight= "1" android:enabled= "False "android:text=" @string/delete "/> <button android:id=" @+id/contacts_cancel_btn " Droid:layout_width= "0dip" android:layout_height= "Wrap_content" android:layout_weight= "1" android:text 
 = "@string/cancel"/> </LinearLayout> </LinearLayout>

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