Java 如何在Android api 11+的Android列表视图中显示联系人
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how to display contacts in a listview in Android for Android api 11+
提问by Terence Chow
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this looks like the same question a million times...but a google search for this provides no results, just a bunch of outdated tutorials using managedQueryand other deprecated solutions...
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，只是一堆使用过时的教程managedQuery和其他已弃用的解决方案......
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.)
我接受了检索联系人列表的android 开发人员培训，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）
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.
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个刚开始的 android 开发人员会欣赏这一点。
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_IDSis 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.
据我所知，我已经按照教程进行了操作，没有出现任何联系人。我认为最重要的是它TO_IDS是一个指向android.R.id.text1. 我很困惑这应该如何以某种方式拉出一组联系人姓名。
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_itemwhich is just textviews populated by TO_IDS, an array of integers.
另外，我很困惑为什么当最终目标是显示列表视图时需要 textview ......在本教程中，我们有 mContactsList 它是一个列表视图......但是我们用一个指向R.layout.contact_list_item它的适配器填充列表视图只是由整数数组 TO_IDS 填充的文本视图。
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);
What am I doing wrong and how do I simply display the contact list in a listview?
我做错了什么，如何简单地在列表视图中显示联系人列表？
EDIT: adding in my code:
编辑：添加我的代码：
in my fragment class:
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) {
}
}
in my activity_main.xml:
在我的 activity_main.xml 中：
<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>
in my contact_list_view xml :
在我的 contact_list_view xml 中：
<?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"/>
In my contact_list_item xml
在我的 contact_list_item xml 中
<?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"/>
finally for contact_list_layout xml:
最后是contact_list_layout xml：
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 listviewalready in the contact_list_view.xml?
我在里面放什么contact_list_layout.xml？这只是一个空的<LinearLayout>吗？教程中并不清楚这个xml是如何处理的。它说这个 XML 是片段，但如果是片段，为什么我们listview在contact_list_view.xml.
采纳答案by zapl
Small stripped down example for displaying the contacts name in a ListView.
Below Fragmentextends ListFragmentwhich 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.
用于在 .csv 文件中显示联系人姓名的小型精简示例ListView。下面的Fragment扩展ListFragment具有默认布局。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。
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);
}
}
