android - 我想使用共享首选项将联系人保存在屏幕上

Question

我编写了从手机获取联系人的代码。现在我想使用共享首选项将联系人保存到 Activity 中。我在下面分享我的代码。请告诉我必须做什么？还有一件事是当所有联系人都保存到 Activity 中时。我想阻止保存到 Activity 中的联系人的来电和去电。

import java.util.ArrayList;
import java.util.Collections;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentResolver;
import android.content.DialogInterface;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button; 
import android.widget.ListView;
import android.widget.Toast;

public class BlackListActivity extends Activity implements OnClickListener {

private static final String TAG = "BlackListActivity";
Button add;
ListView lv;
String[] contactList ;
ArrayList<String> list = new ArrayList<String>();
ArrayList<String> blcklist = new ArrayList<String>();
ArrayAdapter<String> ad;
String spref_identifier = "com.example.app";
String entryIdentifierPrefix = "selectionState_listEntry_";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_black_list);

    add = (Button)findViewById(R.id.add);
    add.setOnClickListener(this);

    lv = (ListView)findViewById(R.id.listView1);

    ContentResolver cr = getContentResolver();
    Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);

    if (cur.getCount() > 0) {
      while (cur.moveToNext()) {
        String id = cur.getString(cur.getColumnIndex(ContactsContract.Contacts._ID));
        String name = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
        if (Integer.parseInt(cur.getString(cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
          Cursor pCur = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?", new String[] { id }, null);
          while (pCur.moveToNext()) {
              list.add(name);
            Log.d(TAG, name);
          }
          pCur.close();
        }
      }

      Collections.sort(list);


    }
    cur.close();

     int x = list.size();
     contactList = new String[x];
     contactList = (String[]) list.toArray(contactList);

     lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {

         public boolean onItemLongClick(AdapterView<?> arg0, View v,final int index, long arg3) {

//               Toast.makeText(BlackListActivity.this,lv.getItemAtPosition(index).toString(), Toast.LENGTH_LONG).show();
             new AlertDialog.Builder(BlackListActivity.this)
             .setMessage("Are you sure want to delete "+lv.getItemAtPosition(index).toString()+" contact number ?")
             .setTitle("Deleting Contact....")
             .setIcon(R.drawable.delete)
             .setPositiveButton("Delete", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(BlackListActivity.this, lv.getItemAtPosition(index).toString()+" contact number deleted", Toast.LENGTH_LONG).show();
                blcklist.remove(index);
                ad.notifyDataSetChanged();
                ad.notifyDataSetInvalidated();
            }
        })
        .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub

            }
        }).show();
                    return false;
                }
    }); 

}

@Override
public void onClick(View v) {

    if( v == add){

        new AlertDialog.Builder(this)
        .setTitle("Contact List")
        .setCancelable(false)
        .setMultiChoiceItems(contactList, null, new DialogInterface.OnMultiChoiceClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int indexSelected, boolean isChecked) {
                // TODO Auto-generated method stub
            if(isChecked){
            blcklist.add(contactList[indexSelected]);
            list.remove(contactList[indexSelected]);

            }
            else if (!isChecked) {
                blcklist.remove(contactList[indexSelected]);
             }
           }    
        })
        .setPositiveButton("Add", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                ad = new ArrayAdapter<String>(BlackListActivity.this,android.R.layout.simple_list_item_1,blcklist);
                lv.setAdapter(ad);
                contactList=(String[]) list.toArray(contactList);
            }
        })
        .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {

            }
        }).show();
    }
}
}

Answer 1

共享首选项将数据保存在键值对中。在共享首选项中保存/获取少量数据很容易，但对于大数据，如果您有很多联系人，则很难获取特定联系人，因此它最好将数据存储到数据库中