android 编程4.2.1

alltolove

学习碎片必须要先安装个平板电脑的模拟器，就在genmotion开始画面新建一个tablet就行了，如图：
重新建个项目，新建两个layout文件，left_fragment.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"
    android:background="@color/colorPrimary">
<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/button"
    android:layout_gravity="center_horizontal"
    android:text="button"/>
</LinearLayout>

right_fragment.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"
    android:background="#00ff00">
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/text_view"
    android:textSize="20sp"
    android:layout_gravity="center_horizontal"
    android:text="This is right fragment"/>
</LinearLayout>

在主文件mainactivity.java边上新建两个java文件，LeftFragment.java

package com.example.xinwei.fragmentactivity;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * Created by xinwei on 2017/10/2.
 */

public class LeftFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.left_fragment,container,false);
        return view;
    }
}

RightFragment.java

package com.example.xinwei.fragmentactivity;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * Created by xinwei on 2017/10/2.
 */

public class RightFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.right_fragment,container,false);
        return view;
    }
}

修改activity_main.xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <fragment
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:id="@+id/left_fragment"
        android:name="com.example.xinwei.fragmentactivity.LeftFragment" />

    <fragment
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:id="@+id/right_fragment"
        android:name="com.example.xinwei.fragmentactivity.RightFragment" />
</LinearLayout>

效果图为：