android 之fragment创建

1.使用xml标签

1.1定义两个重要属性

　　 <fragment
        android:id="@+id/fregment_top"
        android:layout_width="match_parent"
        android:layout_height="220dp"
        android:layout_marginTop="80dp"
        android:name="com.lzh.fragment_study.Framgment_first"
        />

1.2实现一个继承自Fragment的新类

public class Framgment_first extends Fragment {

        public Framgment_first() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container,
                    false);
            return rootView;
        }
    }

1.3创建一个Fragment的layout文件 fragment_main

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.lzh.fragment_study.MainActivity$PlaceholderFragment" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
        />

</RelativeLayout>

2.通过JAVA代码实现

2.1在程序中加入Fragment
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        ExampleFragment fragment = new ExampleFragment();
        fragmentTransaction.add(R.id.container, fragment);
        fragmentTransaction.commit();

getSupportFragmentManager().beginTransaction()
                .add(R.id.container,new Framgment_first()).commit();

2.2动态移除或添加fragment

    getSupportFragmentManager()
                    .beginTransaction()
                    .remove(frag).commit();

 getSupportFragmentManager().beginTransaction()
                    .add(R.id.container,frag).commit();