任何人都可以解释android中arrayadapter中的android.R.layout.simple_list_item_1和android.R.layout.simple_list_item_2。
我知道android.R.layout.simple_list_item_1和android.R.layout.simple_list_item_2是在android本身定义的布局。
android.R.layout.simple_list_item_1中的只包含一个textview，但android.R.layout.simple_list_item_2包含两个文本视图。
我想举例说明android.R.layout.simple_list_item_2 ...如何在listview中用适配器显示两个文本视图。
我的代码是
package com.app.listview;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class ExampleListViewActivity extends Activity {
private String[] nameArr = new String[]{"Arun","Anil","Ankit","Manoj"};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ListView listView = (ListView)findViewById(R.id.lv);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,
android.R.id.text1,
nameArr);
listView.setAdapter(adapter);
}
}
答案 0 :(得分：14)
区别如下。 simple_list_item_1仅包含TextView，而simple_list_item_2在RelativeLayout的子类中有两个。这些都来自果冻豆。
<强> simple_list_item_1管理
<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2006 The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<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"
android:textAppearance="?android:attr/textAppearanceListItemSmall"
android:gravity="center_vertical"
android:paddingLeft="?android:attr/listPreferredItemPaddingLeft"
android:paddingRight="?android:attr/listPreferredItemPaddingRight"
android:minHeight="?android:attr/listPreferredItemHeightSmall"
/>
<强> simple_list_item_2
<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2006 The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<TwoLineListItem xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?android:attr/listPreferredItemHeight"
android:mode="twoLine"
>
<TextView android:id="@android:id/text1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="?android:attr/listPreferredItemPaddingLeft"
android:layout_marginTop="8dip"
android:textAppearance="?android:attr/textAppearanceListItem"
/>
<TextView android:id="@android:id/text2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@android:id/text1"
android:layout_alignLeft="@android:id/text1"
android:textAppearance="?android:attr/textAppearanceSmall"
/>
</TwoLineListItem>
默认情况下，此类需要提供的资源ID引用 一个TextView。
因此，默认情况下，ArrayAdapter不会自动填充多个TextView个实例。但是，您可以覆盖getView()方法并填写TextView
R.layout.simple_list_item_2
答案 1 :(得分：13)
我发现这是你问题最简单的答案：
ArrayAdapter adapter = new ArrayAdapter(context, android.R.layout.simple_list_item_2, android.R.id.text1, list) {
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = super.getView(position, convertView, parent);
TextView text1 = (TextView) view.findViewById(android.R.id.text1);
TextView text2 = (TextView) view.findViewById(android.R.id.text2);
text1.setText(person[position].getName());
text2.setText(person[position].getAge());
return view;
}
};
如果您没有注意到：诀窍是向ArrayAdapter提供android.R.id.text1（主要是不必要的）参数，否则对super的调用将导致异常。
此外，此解决方案不需要Inflater或使用{1}}，这在API 17中已弃用。
答案 2 :(得分：4)
就像你注意到的那样，layout_1有一个textView，它是默认使用的。 layout_2有两个文本视图 - 另一个用作子文本。
但这是诀窍 - 并非所有适配器都使用了子文本;）
我发现为任何事物和所有内容编写专用的自定义适配器更容易（不是说强制性的）......
例如，这是一个自定义适配器，它将使用此simple_list_item_2显示名称及其状态
这不会是复制/粘贴代码，但你会通过一些调整来修复它......
public class BuddyArrayAdapter extends ArrayAdapter<Buddy>
{
private static final String tag = "BuddyArrayAdapter";
private Context context;
private TextView buddyName;
private TextView buddyStatus;
private List<Buddy> buddies = new ArrayList<Buddy>();
/**
* The default constructor which is invoked to create the buddy array
* adapter.
* <p>
* The adapter is needed to 'translate' data into a viewable item / widget.
*
* @param context
* the application context
* @param objects
* the backing array populated by Buddy objects to be displayed.
* @see {@link ArrayAdapter}<T>
*/
public BuddyArrayAdapter(Context context, int textViewResourceId, List<Buddy> objects)
{
super(context, textViewResourceId, objects);
this.context = context;
this.buddies = objects;
Collections.sort(buddies);
}
/**
* The method used for determining how many views are in this list or in
* other words, how many views are managed by this adapter.
*
* @return the number of items this adapter controls.
*/
@Override
public int getCount()
{
return this.buddies.size();
}
/**
* Get the data item associated with the specified position in the data set.
*
* @param index
* Position of the item whose data we want within the adapter's
* data set.
* @return the Buddy object data at the specified position.
*/
@Override
public Buddy getItem(int index)
{
if (index <= getCount()) //IndexOutOfBoundsException fix
return this.buddies.get(index);
return this.buddies.get(getCount() - 1);
}
/**
* Get a View that displays the data at the specified position in the data
* set. You can either create a View manually or inflate it from an XML
* layout file. When the View is inflated, the parent View (GridView,
* ListView...) will apply default layout parameters unless you use
* inflate(int, android.view.ViewGroup, boolean) to specify a root view and
* to prevent attachment to the root.
* <p>
* This method is used to generate views to be used in the ListView. This
* the method that defines how data will look and be represented throughout
* the UI.
*
* @param position
* The position of the item that is being placed / The position
* of the item within the adapter's data set of the item whose
* view we want.
* <p>
* @param convertView
* The old view to reuse, if possible. Note: You should check
* that this view is non-null and of an appropriate type before
* using. If it is not possible to convert this view to display
* the correct data, this method can create a new view.
* Heterogeneous lists can specify their number of view types, so
* that this View is always of the right type (see
* getViewTypeCount() and getItemViewType(int))
* <p>
* @param parent
* The parent that this view will eventually be attached to.
* @return the view that defines how this Buddy object is represented in the
* ListView / A View corresponding to the data at the specified
* position.
*
* @see {@link BaseAdapter#getView(int, View, ViewGroup)}
*/
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
View row = convertView;
if (row == null)
{
// ROW INFLATION
LayoutInflater inflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.simple_list_item_2, parent, false);
}
// Get item
Buddy buddy = getItem(position);
buddy.refresh();
buddyName = (TextView) row.findViewById(R.id.buddy_name); //change this to textField1 from simple_list_item_2
buddyName.setText(buddy.toString());
buddyStatus = (TextView) row.findViewById(R.id.buddy_mood); //change this to textField2 from simple_list_item_2
buddyStatus.setText(buddy.getMood());
// Log.d(tag, buddy.getIdentity()+"'s mood is "+buddyStatus.getText());
return row;
}
所以我建议您使用包含子文件的附加ArrayList扩展构造函数，然后使用em而不是buddy.getMood（）调用。
最后，实例化此适配器并将其设置为listView的适配器。瞧，你们两个文本都出现了;）
要进一步细化，请创建包含两个textView的XML文件，如下所示。
<?xml version="1.0" encoding="utf-8"?>
<com.skype.widget.CheckableLinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<CheckedTextView
android:id="@+id/buddy_name"
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:checkMark="?android:attr/textCheckMark"
android:gravity="center_vertical"
android:paddingLeft="6dip"
android:paddingRight="6dip"
android:text="@string/buddy_name"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/buddy_mood"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/empty_string"
android:layout_marginLeft="-350dp"
android:layout_marginTop="16dp"
android:gravity="center_vertical|bottom"
android:textAppearance="?android:attr/textAppearanceSmall" />
而不是
row = inflater.inflate(R.layout.simple_list_item_2, parent, false);
DO
row = inflater.inflate(R.layout.buddy_list_item, parent, false);
现在，您知道如何使适配器与自定义XML和listViews一起使用。
答案 3 :(得分：2)
消息 - 是List<Map<String, String>>，
标题和数据 - 是地图的关键。
SimpleAdapter adapter = new SimpleAdapter(this, messages,
android.R.layout.simple_list_item_2,
new String[] {"title", "data"},
new int[] {android.R.id.text1,
android.R.id.text2,
});
list.setAdapter(adapter);
这就是你所需要的一切。
答案 4 :(得分：1)
ArrayAdapter只知道如何处理每行一个TextView。如果你想要它处理更多，你需要通过继承ArrayAdapter并覆盖getView()方法来处理它。
根据您创建阵列的方式，可能还有另一个答案。
如果数组是从DB创建的（你显示一个硬编码的字符串数组，但据我所知，这可能只是你的例子）并且你没有被其他因素约束到数组，你可能会考虑使用CursorAdapter，因为它们已经设置为处理多个TextView而无需子类化适配器，它将为您节省将数据库数据转换为数组的处理能力。
答案 5 :(得分：0)
我也使用基本项目以编程方式完成了这项工作：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginLeft="3dp"
android:id="@+id/linearLayoutBasicItem"
>
<ImageView
android:id="@+id/imageViewBasicItem"
android:layout_marginTop="3dp"
android:layout_width="80dp"
android:layout_height="100dp"
android:src="@drawable/blockbreaker3"
android:background="#b3b3b3"
/>
<RelativeLayout
android:id="@+id/relativeLayoutInsideBasicItem"
android:layout_width="fill_parent"
android:layout_marginTop="3dp"
android:layout_height="100dp"
android:background="#b3b3b3"
>
<TextView
android:id="@+id/textViewBasicItem"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Affronta livelli ancora più complessi che ti porteranno al di là di un semplice schermo pieno di mattoncini."
android:textSize="10dp"
android:textColor="#000000"
android:gravity="top"
android:ems="10" />
<TextView
android:id="@+id/textViewPlatformItem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textViewBasicItem"
android:layout_marginTop="3dp"
android:text="Platform: "
android:textSize="8dp"
android:textColor="#000000"
android:gravity="top"
android:ems="10" />
<TextView
android:id="@+id/textViewTypeItem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textViewPlatformItem"
android:layout_marginTop="3dp"
android:text="Genere: "
android:textSize="8dp"
android:textColor="#000000"
android:gravity="top"
android:ems="10" />
<TextView
android:id="@+id/textViewDateItem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textViewTypeItem"
android:layout_marginTop="3dp"
android:text="Data di lancio: "
android:textSize="8dp"
android:textColor="#000000"
android:gravity="top"
android:ems="10"
android:layout_marginBottom="3dp"
/>
<TextView
android:id="@+id/textViewPriceItem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="Gratis "
android:gravity="right"
android:textSize="15dp"
android:textColor="#0096ff"
android:ems="10"
/>
</RelativeLayout>
</LinearLayout>
将此图层添加到我的主要活动
中的垂直线性布局中...
<ScrollView
android:id="@+id/scrollViewStep1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@+id/textViewStep1"
android:layout_marginTop="35dp"
android:layout_marginRight="10dp"
android:layout_marginLeft="10dp"
android:layout_marginBottom="32dp"
android:background="#e8e8e8"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="@+id/collector"
></LinearLayout>
</ScrollView>
...
添加修改内容的项目的活动内的代码是：
public void listViewTailer(int rootId, int itemId){
LinearLayout collector = (LinearLayout) findViewById(rootId);
LinearLayout inflatedView;
for(int i = 0; i < listFeeder.size(); i++){
inflatedView = (LinearLayout) View.inflate(this, itemId, null);
TextView description = (TextView) inflatedView.findViewById(id.textViewBasicItem);
description.setText(listFeeder.getGameList().get(i).getPrdDescription());
TextView platform = (TextView) inflatedView.findViewById(id.textViewPlatformItem);
platform.setText(platform.getText() + "" + listFeeder.getGameList().get(i).getPrdPlatform());
TextView type = (TextView) inflatedView.findViewById(id.textViewTypeItem);
type.setText(type.getText() + "" + listFeeder.getGameList().get(i).getPrdType());
TextView date = (TextView) inflatedView.findViewById(id.textViewDateItem);
date.setText(date.getText() + "" + listFeeder.getGameList().get(i).getPrdDateAvailability());
TextView price = (TextView) inflatedView.findViewById(id.textViewPriceItem);
price.setText(listFeeder.getGameList().get(i).getPrdPrice() + " ");
collector.addView(inflatedView);
ImageView imageView = (ImageView) inflatedView.findViewById(id.imageViewBasicItem);
imageView.setImageResource(listFeeder.getGameList().get(i).getPrdImage());
}
}
其中rootId是收集器布局，而itemId是添加到垂直线性布局的基本项。
希望这可以提供帮助。