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我想将联系人加载到我的列表视图,但每次(不仅此项目)光标加载错误。列表视图有一个复选框,用户从列表中选择,所有值转到第二个活动。我的应用程序不能识别错误的项目和所选项目不要“T匹配其电话号码,我怎样才能解决这个重复如何将联系人加载到列表视图是否正确?
注:?我想
if (!listtearama.contains(phonenumber)){
listtearama.add(phonenumber);
}
它不工作
。这就是为什么我的应用程序加载错误。
public class MainActivity extends AppCompatActivity {
ArrayList<String> selectedlist = new ArrayList<>();
ListView chosinglist;
Button kaydet;
ArrayList<String> selectedlistarama = new ArrayList<>();
ArrayList<String> listte = new ArrayList<String>();
ArrayList<String> listtearama = new ArrayList<>();
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
chosinglist = (ListView) findViewById(R.id.chosing);
chosinglist.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
getNumber(this.getContentResolver());
}
private void getNumber(ContentResolver contentResolver) {
Cursor phones = contentResolver.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
if (phones != null && phones.getCount() > 0) {
//move to the first element, the cursor might be at an invalid location
phones.moveToFirst();
do {
String name = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
String phonenumber = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
System.out.println(".................." + phonenumber);
listte.add(name);
listtearama.add(phonenumber);
} while (phones.moveToNext());
phones.close();// close cursor
}
final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.checkrow,
R.id.checkedTextView2, listte);
kaydet.setEnabled(false);
chosinglist.setAdapter(adapter);
chosinglist.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String selecteditem = (String) parent.getAdapter().getItem(position);
String aramakicinliste = listtearama.get(position);
if (selectedlistarama.contains(aramakicinliste)) {
selectedlistarama.remove(aramakicinliste);
} else
selectedlistarama.add(aramakicinliste);
if (selectedlist.contains(selecteditem)) {
selectedlist.remove(selecteditem);
} else selectedlist.add(selecteditem);
}
您是否尝试过适配器的notifyDataSetChanged()方法? – Danger
是的,我现在试过了,它在第一个活动中不起作用 –
你如何更新适配器?通常情况下,流程如下:首先更新ArrayList,然后使用该ArrayList更新适配器,然后将适配器设置为你的ListView。notifyDataSetChanged()被使用,如果Arraylist的元素有任何变化,Adapter会得到通知并且会更新ListView。 – Danger