碎片Fragment

fragment适用用平板电脑（大屏幕）

注意要点：

1.MainActivity要继承 FragmentActivity 而不是Activity

2.LeftFragment 继承 Fragment时要import android.support.v4.app.Fragment;而不是import android.app.Fragment;

3.在activity_main.xml里声明碎片使用fragment而不是Fragment或者android.support.v4.app.Fragment

left_fragment.xml

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#333"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
android:textColor="#fff"/>

</LinearLayout>

right_fragment.xml

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

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"/>

</LinearLayout>

LeftFragment.java

package com.example.fragment;

import com.example.testsometing.R;

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

public class LeftFragment extends Fragment{

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

RightFragment.java

package com.example.fragment;

import com.example.testsometing.R;

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

public class RightFragment extends Fragment{

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

activity_main.xml

<LinearLayout
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
>

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

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

MainActivity.java

public class MainActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}

让不同大小的移动设备显示不同的布局

在res/下创建layout-large或者layout-sw600dp文件夹。

layout-large是指大屏幕，但是不够灵活，所以使用layout-sw600dp（屏幕尺寸大于600dp）。

layout-sw600dp要在模拟器的platform大于4.0才有效