java - 查询以在 1 行代码中获取电子邮件、联系人姓名和电话号码

Question

nullim 使用 Cursor cursor = getContentResolver() .query(contactUri, projection, null,null,null); 获取点击联系人的数量。是否可以使用此查询获取电子邮件、号码和姓名。同时？我们可以这样做吗？如下所示？

                 String[] projection = {Phone.NUMBER};
             String[] projection1 = {Email.DATA};
             String[] projection2 = {Contacts.DISPLAY_NAME};
                 Cursor cursor = getContentResolver().
                 query(contactUri, projection, null,projection1,projection2);
             cursor.moveToFirst();
                 int column = cursor.getColumnIndex(Phone.NUMBER);
             int column1 = cursor.getColumnIndex(Email.DATA);
             int column2= cursor.getColumnIndex(Contacts.DISPLAY_NAME);
             String number = cursor.getString(column);
             String email1 = cursor.getString(column1);
             String name1 = cursor.getString(column2)

这可能吗？

现在这正确吗？

   String[] projection = {Phone.NUMBER, Email.ADDRESS, Contacts.DISPLAY_NAME};
   Cursor cursor = getContentResolver().
             query(contactUri, projection, null,null,null);
         cursor.moveToFirst();
             int column = cursor.getColumnIndex(Phone.NUMBER);
         int column1 = cursor.getColumnIndex(Email.ADDRESS);
         int column2= cursor.getColumnIndex(Contacts.DISPLAY_NAME);
         String number = cursor.getString(column);
         String email1 = cursor.getString(column1);
         String name1 = cursor.getString(column2)


             editText3 = (EditText) findViewById(R.id.editText3);
             editText17 = (EditText) findViewById(R.id.editText17);
             editText3.setText(number); 
             editText17.setText(email1); 

只有电话号码在文本框中设置edittext3和edittext17都有手机号码？我做错了什么？谢谢你

Answer 1

您可以在一个数组中放置多个值：

String[] projection = {Phone.NUMBER, Email.DATA, Contacts.DISPLAY_NAME};

---

全部一起：

String[] projection = {Phone.NUMBER, Email.DATA, Contacts.DISPLAY_NAME};
Cursor cursor = getContentResolver().query(contactUri, projection, null, null, null);

int column = cursor.getColumnIndex(Phone.NUMBER);
int column1 = cursor.getColumnIndex(Email.DATA);
int column2= cursor.getColumnIndex(Contacts.DISPLAY_NAME);
if(cursor.moveToFirst()) { // Check if data exists
     String number = cursor.getString(column);
     String email1 = cursor.getString(column1);
     String name1 = cursor.getString(column2)
}