如何在Android api 11+的Android列表视图中显示联系人 [英] how to display contacts in a listview in Android for Android api 11+
问题描述
如果这看起来像一百万次相同的问题，我很抱歉......但是谷歌搜索没有提供任何结果，只是一堆使用 managedQuery 和其他已弃用解决方案的过时教程...
I'm sorry if this looks like the same question a million times...but a google search for this provides no results, just a bunch of outdated tutorials using managedQuery and other deprecated solutions...
我参加了 android 开发人员检索联系人列表的培训，但教程不完整，甚至下载示例代码也无济于事，因为示例代码用于更高级的联系人列表操作(搜索等)
I went through the android developer training for retrieving a contact list, but the tutorial is incomplete and even downloading the sample code doesn't help because the sample code is for more advanced contact list manipulation (search, etc.)
无论如何，没有理由不应该有一个简单的解决方案，所以我希望有人能在这里回答，因为我确定这已经完成了一百万次，而且我确定还有其他几十次刚开始的 Android 开发者会很欣赏这一点.
In any case, there is no reason why there should not be a simple solution to this so I'm hoping someone can answer here because I'm sure this has been done a million times and I'm sure dozens of other beginning android developers would appreciate this.
据我所知，我已按照教程进行操作，没有出现任何联系人.我认为最重要的是 TO_IDS 是一个指向 android.R.id.text1 的整数数组.我很困惑这应该如何以某种方式拉出一组联系人姓名.
I have followed the tutorial to the best of my knowledge by no contacts show up. I think the biggest thing is that the TO_IDS is an integer array that points to android.R.id.text1. I'm confused how that is supposed to somehow pull an array of contact names.
另外，当最终目标是显示列表视图时，我很困惑为什么需要文本视图......在本教程中，我们有 mContactsList，它是一个列表视图......但我们用适配器填充列表视图指向 R.layout.contact_list_item，它只是由整数数组 TO_IDS 填充的文本视图.
Also, I'm confused why a textview is needed when the end goal is to display a listview...In the tutorial, we have mContactsList which is a list view...But we populate the list view with an adapter pointing to R.layout.contact_list_item which is just textviews populated by TO_IDS, an array of integers.
mContactsList = (ListView) getActivity().findViewById(R.layout.contact_list_view);
mCursorAdapter = new SimpleCursorAdapter(
getActivity(),
R.layout.contact_list_item,
null,
FROM_COLUMNS, TO_IDS,
0);
mContactList.setAdapter(mCursorAdapter);
我做错了什么，如何在列表视图中简单地显示联系人列表?
What am I doing wrong and how do I simply display the contact list in a listview?
添加我的代码:
在我的片段类中:
public class MyFragment extends Fragment implements
LoaderManager.LoaderCallbacks<Cursor>{
private static final String[] FROM_COLUMNS = {ContactsContract.Contacts.DISPLAY_NAME_PRIMARY };
private static final int[] TO_IDS = {android.R.id.text1};
ListView mContactList;
private SimpleCursorAdapter mCursorAdapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
return inflater.inflate(R.layout.contact_list_view,container,false);
}
@Override
public void onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
mContactsList = (ListView) getActivity().findViewById(R.layout.contact_list_view);
mCursorAdapter = new SimpleCursorAdapter(
getActivity(),
R.layout.contact_list_item,
null,
FROM_COLUMNS, TO_IDS,
0);
mContactList.setAdapter(mCursorAdapter);
}
@Override
public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
return null;
}
@Override
public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
}
@Override
public void onLoaderReset(Loader<Cursor> cursorLoader) {
}
}
在我的activity_main.xml中:
in my activity_main.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<fragment
android:id ="@+id/contactListFragment"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:name="preamble.myapp.MyFragment"/>
</LinearLayout>
在我的 contact_list_view xml 中:
in my contact_list_view xml :
<?xml version="1.0" encoding="utf-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/list"
android:layout_height="match_parent"
android:layout_width="match_parent"/>
在我的 contact_list_item xml 中
In my contact_list_item xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/text1"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
最后是contact_list_layout xml:
finally for contact_list_layout xml:
我在 contact_list_layout.xml 中放了什么?这只是一个空的 contact_list_view.xml 中定义一个 listview ?
What do I put in the contact_list_layout.xml? Is this just an empty <LinearLayout>? It's not clear in the tutorial how this xml is handled. It says this XML is the fragment, but if it's the fragment, why did we define a listview already in the contact_list_view.xml?
推荐答案
用于在 ListView 中显示联系人姓名的精简示例.Fragment 下面扩展了具有默认布局的 ListFragment.您不需要指定自己的.列表项的布局也取自 Android 的默认布局 (android.R.layout.simple_list_item_1)，它是每个项目的简单单行文本.
Small stripped down example for displaying the contacts name in a ListView.
Below Fragment extends ListFragment which has a default layout. You don't need to specify your own. The layout for list items is also taken from Android's default layouts (android.R.layout.simple_list_item_1) which is a simple single line of text per item.
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract.Contacts;
import android.support.v4.app.ListFragment;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v4.widget.CursorAdapter;
import android.support.v4.widget.SimpleCursorAdapter;
public class ContactListFragment extends ListFragment implements LoaderCallbacks<Cursor> {
private CursorAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// create adapter once
Context context = getActivity();
int layout = android.R.layout.simple_list_item_1;
Cursor c = null; // there is no cursor yet
int flags = 0; // no auto-requery! Loader requeries.
mAdapter = new SimpleCursorAdapter(context, layout, c, FROM, TO, flags);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
// each time we are started use our listadapter
setListAdapter(mAdapter);
// and tell loader manager to start loading
getLoaderManager().initLoader(0, null, this);
}
// columns requested from the database
private static final String[] PROJECTION = {
Contacts._ID, // _ID is always required
Contacts.DISPLAY_NAME_PRIMARY // that's what we want to display
};
// and name should be displayed in the text1 textview in item layout
private static final String[] FROM = { Contacts.DISPLAY_NAME_PRIMARY };
private static final int[] TO = { android.R.id.text1 };
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
// load from the "Contacts table"
Uri contentUri = Contacts.CONTENT_URI;
// no sub-selection, no sort order, simply every row
// projection says we want just the _id and the name column
return new CursorLoader(getActivity(),
contentUri,
PROJECTION,
null,
null,
null);
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
// Once cursor is loaded, give it to adapter
mAdapter.swapCursor(data);
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
// on reset take any old cursor away
mAdapter.swapCursor(null);
}
}
这篇关于如何在Android api 11+的Android列表视图中显示联系人的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
