Fragment

· Fragment

创建一个Fragment类

use the onCreateView()：this is the only callback （回调函数）you need in order to get a fragment running.​
for example：​

import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.ViewGroup;public class ArticleFragment extends Fragment {    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,        Bundle savedInstanceState) {        // Inflate the layout for this fragment        return inflater.inflate(R.layout.article_view, container, false);    }}



· 应用
· Add a Fragment to an Activity using XML
​​​While fragments are reusable, modular UI components, each instance of a Fragment class must be associated with a parent FragmentActivity. You can achieve this association by defining each fragment within your activity layout XML file.
（当Fragment被重复使用，模式化为UI组件，每个Fragment类的实例都连接着FragmentActivity（父类），你可以通过在你的activity layout XML file中定义每个Fragment获得这个关联）​
​
​step1：
​
res/layout-large/news_articles.xml​
​
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="horizontal"    android:layout_width="fill_parent"    android:layout_height="fill_parent">    <fragment android:name="com.example.android.fragments.HeadlinesFragment"              android:id="@+id/headlines_fragment"              android:layout_weight="1"              android:layout_width="0dp"              android:layout_height="match_parent" />    <fragment android:name="com.example.android.fragments.ArticleFragment"              android:id="@+id/article_fragment"              android:layout_weight="2"              android:layout_width="0dp"              android:layout_height="match_parent" /></LinearLayout>


step2：apply the layout to your activity
import android.os.Bundle;import android.support.v4.app.FragmentActivity;public class MainActivity extends FragmentActivity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.news_articles);    }}


Note:
​1. FragmentActivity is a special activity provided in the Support Library to handle fragments on system versions older than API level 11. If the lowest system version you support is API level 11 or higher, then you can use a regular Activity.​​
（低于API level 11使用FragmentActivity，高于API level 11）​
2.If you're using the v7 appcompat library, your activity should instead extend AppCompatActivity, which is a subclass of FragmentActivity.
3.When you add a fragment to an activity layout by defining the fragment in the layout XML file, you cannot remove the fragment at runtime. If you plan to swap your fragments in and out during user interaction, you must add the fragment to the activity when the activity first starts​(swap in/out:换入/出)

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