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

1. <?xml version="1.0" encoding="utf-8"?>
   
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   
3.     android:orientation="vertical" android:layout_width="match_parent"
   
4.     android:layout_height="match_parent"
   
5.     android:background="@color/colorPrimary">
   
6. <Button
   
7.     android:layout_width="wrap_content"
   
8.     android:layout_height="wrap_content"
   
9.     android:id="@+id/button"
   
10.     android:layout_gravity="center_horizontal"
    
11.     android:text="button"/>
    
12. </LinearLayout>

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right_fragment.xml

1. <?xml version="1.0" encoding="utf-8"?>
   
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   
3.     android:orientation="vertical" android:layout_width="match_parent"
   
4.     android:layout_height="match_parent"
   
5.     android:background="#00ff00">
   
6. <TextView
   
7.     android:layout_width="wrap_content"
   
8.     android:layout_height="wrap_content"
   
9.     android:id="@+id/text_view"
   
10.     android:textSize="20sp"
    
11.     android:layout_gravity="center_horizontal"
    
12.     android:text="This is right fragment"/>
    
13. </LinearLayout>

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

1. package com.example.xinwei.fragmentactivity;
   
2. 
   
3. import android.os.Bundle;
   
4. import android.support.annotation.Nullable;
   
5. import android.support.v4.app.Fragment;
   
6. import android.view.LayoutInflater;
   
7. import android.view.View;
   
8. import android.view.ViewGroup;
   
9. 
   
10. /**
    
11. * Created by xinwei on 2017/10/2.
    
12. */
    
13. 
    
14. public class LeftFragment extends Fragment {
    
15.     @Nullable
    
16.     @Override
    
17.     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    
18.         View view = inflater.inflate(R.layout.left_fragment,container,false);
    
19.         return view;
    
20.     }
    
21. }
    

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RightFragment.java

1. package com.example.xinwei.fragmentactivity;
   
2. 
   
3. import android.os.Bundle;
   
4. import android.support.annotation.Nullable;
   
5. import android.support.v4.app.Fragment;
   
6. import android.view.LayoutInflater;
   
7. import android.view.View;
   
8. import android.view.ViewGroup;
   
9. 
   
10. /**
    
11. * Created by xinwei on 2017/10/2.
    
12. */
    
13. 
    
14. public class RightFragment extends Fragment {
    
15.     @Nullable
    
16.     @Override
    
17.     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    
18.         View view = inflater.inflate(R.layout.right_fragment,container,false);
    
19.         return view;
    
20.     }
    
21. }
    

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修改activity_main.xml文件

1. <?xml version="1.0" encoding="utf-8"?>
   
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   
3.     android:orientation="horizontal" android:layout_width="match_parent"
   
4.     android:layout_height="match_parent">
   
5. 
   
6.     <fragment
   
7.         android:layout_width="0dp"
   
8.         android:layout_height="match_parent"
   
9.         android:layout_weight="1"
   
10.         android:id="@+id/left_fragment"
    
11.         android:name="com.example.xinwei.fragmentactivity.LeftFragment" />
    
12. 
    
13.     <fragment
    
14.         android:layout_width="0dp"
    
15.         android:layout_height="match_parent"
    
16.         android:layout_weight="1"
    
17.         android:id="@+id/right_fragment"
    
18.         android:name="com.example.xinwei.fragmentactivity.RightFragment" />
    
19. </LinearLayout>

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效果图为：