Question

当我编译程序时，它显示错误找不到类NativeContentProvider
下面给出的是我试图使用的代码，但没有工作

    private void displayContacts() {

        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()) {
                        String phoneNo = pCur.getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                        Toast.makeText(NativeContentProvider.this, "Name: " + name + ", Phone No: " + phoneNo, Toast.LENGTH_SHORT).show();
                    }
                    pCur.close();
                }
            }
        }
    }

    public void clickFunction(View view){
        displayContacts();
    }

其中clickFunction是按钮的onClick方法

Answer 1

Toast.makeText(NativeContentProvider.this, "Name: " + name + ", Phone No: " + phoneNo, Toast.LENGTH_SHORT).show();

这里NativeContentProvider.this这应该是活动或背景!!

Answer 2

Toast的基本语法。

Toast.makeText(context, text, duration).show();

尝试

Toast.makeText(YourActivity.this, "Name: " + name + ", Phone No: " + phoneNo, Toast.LENGTH_SHORT).show();

或

Toast.makeText(getApplicationContext(), "Name: " + name + ", Phone No: " + phoneNo, Toast.LENGTH_SHORT).show();

找不到符号类NativeContentProvider

2 个答案: