Fragment入门

主要步骤

1、写出fragment的布局文件
2、定义一个继承Fragment的类加载该布局文件
3、fragment的调用

FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = 
                         fragmentManager.beginTransaction(); fragmentTransaction.replace(android.R.id.content,new Fragment1());
fragmentTransaction.commit();

定义一个继承Fragment的类

public class Fragment1 extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    //加载布局文件
    View view = inflater.inflate(R.layout.fragment_1, null);
        return view;
    }
}

主函数中根据横竖屏加载不同fragment

//获取屏幕分辨率
        WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
        Point point = new Point();
        wm.getDefaultDisplay().getSize(point);
        int x= point.x;
        int y = point.y;
        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();//开启事务
        if(y>x){
            //横屏
            fragmentTransaction.replace(android.R.id.content,new Fragment1());

        }else{
            //竖屏
            fragmentTransaction.replace(android.R.id.content,new Fragment1());
        }

        //☆☆☆☆☆ 提交事务
        fragmentTransaction.commit();
    ```