Android编程权威指南之Activity的抽象类使用

SingleFragmentActivity.java:

import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentManager;/** * Created by Administrator on 2017/4/8. */

public abstract class SingleFragmentActivity extends FragmentActivity {    protected abstract Fragment creatFragment( );    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView( R.layout.activity_main );        FragmentManager fm = getSupportFragmentManager( );        Fragment fragment = fm.findFragmentById( R.id.fragment_container );        if( fragment == null ) {            fragment = creatFragment();            fm.beginTransaction().add(R.id.fragment_container, fragment ).commit();        }    }}

DataListActivity.java:

public class DataListActivity extends SingleFragmentActivity{    @Override    protected Fragment creatFragment() {        return new DataListFragment();    }}

DataListFragment.java:

import android.support.v4.app.Fragment;/** * Created by Administrator on 2017/4/8. */public class DataListFragment extends Fragment {}

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/fragment_container"    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.example.administrator.recycleviewtest.MainActivity">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Hello World!" />FrameLayout>

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