Question

以下是我的代码，实际上在屏幕上它没有显示任何联系人。在模拟器中我添加了5个联系人。请告诉我该怎么做。

{
    //some code
    Cursor cur = getContacts();
    String[] fields = new String[] {ContactsContract.Data.DISPLAY_NAME};
    SimpleCursorAdapter adapter = 
        new SimpleCursorAdapter(this, 
                                R.layout.list_view_item_new,
                                cur,
                                fields,
                                new int[] {R.id.contactEntryText});
    lv.setAdapter(adapter);
}

private Cursor getContacts() {  
    // Run query     
    Uri uri = ContactsContract.Contacts.CONTENT_URI;
    String[] projection = 
        new String[]{ ContactsContract.Contacts._ID,
                      ContactsContract.Contacts.DISPLAY_NAME }; 
    String selection = null;
    String[] selectionArgs = null;  
    String sortOrder = ContactsContract.Contacts.DISPLAY_NAME + 
        " COLLATE LOCALIZED ASC";  
    return managedQuery(uri, projection, selection, selectionArgs, sortOrder);  
}

Answer 1

我复制并执行了几乎相同的代码并且它可以工作：

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Cursor cur = getContacts();

        ListView lv = getListView();

       String[] fields = new String[] {ContactsContract.Data.DISPLAY_NAME};

       SimpleCursorAdapter adapter = 
                new SimpleCursorAdapter(this, 
                                        R.layout.main,
                                        cur,
                                        fields,
                                        new int[] {R.id.txtbox});
          lv.setAdapter(adapter);         
    }    

    private Cursor getContacts() {  
        // Run query     
        Uri uri = ContactsContract.Contacts.CONTENT_URI;

        String[] projection = 
                new String[]{ ContactsContract.Contacts._ID,
                              ContactsContract.Contacts.DISPLAY_NAME }; 
            String selection = null;
            String[] selectionArgs = null;  
            String sortOrder = ContactsContract.Contacts.DISPLAY_NAME + 
                " COLLATE LOCALIZED ASC";  
            return managedQuery(uri, projection, selection, selectionArgs, sortOrder);
    }

请检查textview实施中是否有任何错误？

Answer 2

首先，我只是缩小问题范围。

1）检查您是否有阅读联系人的权限

<uses-permission android:name="android.permission.READ_CONTACTS"/>

2）检查光标是否有任何结果

cur.getCount()

如何在ListView中显示手机通讯录

2 个答案: