Fragment的创建与使用

使用Fragment最简单的方式就是把Fragment当成最普通的控件,可以直接写在Activity的布局文件中。整个过程只需要两步：一是继承Fragment,重写onCreateView,决定Fragment的布局,二是在Activity布局文件中加入Fragment,与普通的View一样。
MainActivity.java

package com.sdutacm.viewpager.Fragment;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import com.sdutacm.viewpager.R;public class Main2Activity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout    android:orientation="vertical"    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.sdutacm.viewpager.Fragment.MainActivity">    <fragment        android:id="@+id/id_fragment_title"        android:name="com.sdutacm.viewpager.Fragment.TitleFragment"        android:layout_width="match_parent"        android:layout_height="45dp" />    <fragment        android:id="@+id/id_fragment_content"        android:name="com.sdutacm.viewpager.Fragment.ContentFragment"        android:layout_width="match_parent"        android:layout_height="match_parent" /></LinearLayout>

TitleFragment.java

package com.sdutacm.viewpager.Fragment;import android.app.Fragment;import android.os.Bundle;import android.support.annotation.Nullable;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import com.sdutacm.viewpager.R;/** * Created by bummer on 2017/8/14. */public class TitleFragment extends Fragment {    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.fragment_title,container,false);        return view;    }}

fragment_title.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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:background="#EE30A7"    tools:context="com.sdutacm.viewpager.Fragment.TitleFragment">    <TextView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:gravity="center"        android:text="新闻浏览器"        android:textSize="28sp" /></LinearLayout>

ContentFragment.java

package com.sdutacm.viewpager.Fragment;import android.app.Fragment;import android.os.Bundle;import android.support.annotation.Nullable;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.Button;import android.widget.TextView;import com.sdutacm.viewpager.R;/** * Created by bummer on 2017/8/14. */public class ContentFragment extends Fragment{    private Button contentButton;    private TextView textView;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.fragment_content,container,false);        intiView(view);        return view;    }    private void intiView(View view) {        contentButton = (Button) view.findViewById(R.id.contentButton);        textView = (TextView) view.findViewById(R.id.contentText);        contentButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                textView.setText("中国羽毛队获得了奥运会冠军");            }        });    }}

fragment_content.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent"    xmlns:tools="http://schemas.android.com/tools"    tools:context="com.sdutacm.viewpager.Fragment.ContentFragment"    >    <TextView        android:layout_width="match_parent"        android:layout_height="100dp"        android:id="@+id/contentText"        android:text="@string/content"        android:textSize="25sp"        />    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/contentButton"        android:text="@string/addNews"        /></LinearLayout>