Fragment知识整理

横竖屏切换改变

int width = getWindowManager().getDefaultDisplay().getWidth();
        int height = getWindowManager().getDefaultDisplay().getHeight();

        Fragment1 fragment1 = new Fragment1();
        Fragment2 fragment2 = new Fragment2();

        //定义片段管理器
        FragmentManager fm=getFragmentManager();
        //定义片段事务处理
        FragmentTransaction ft=fm.beginTransaction();

        //判断横竖屏
        if(width>height){
            ft.replace(android.R.id.content, fragment1);
        }else{
            ft.replace(android.R.id.content, fragment2);
        }

        ft.commit();

Activity向Fragment传数据

// 创建Bundle，准备向Fragment传入参数
        Bundle arguments = new Bundle();
        arguments.putInt(BookDetailFragment.ITEM_ID, id);
        // 创建BookDetailFragment对象
        BookDetailFragment fragment = new BookDetailFragment();
        // 向Fragment传入参数
        fragment.setArguments(arguments);
        // 使用fragment替换book_detail_container容器当前显示的Fragment
        getFragmentManager().beginTransaction()
            .replace(R.id.book_detail_container, fragment)
            .commit();

 

Fragment获取数据

if (getArguments().containsKey(ITEM_ID))
        {
            book = BookContent.ITEM_MAP.get(getArguments()
                .getInt(ITEM_ID)); //①
        }

Fragment显示布局文件

// 重写该方法，该方法返回的View将作为Fragment显示的组件
    @Override
    public View onCreateView(LayoutInflater inflater
        , ViewGroup container, Bundle savedInstanceState)
    {
        // 加载/res/layout/目录下的fragment_book_detail.xml布局文件
        View rootView = inflater.inflate(R.layout.fragment_book_detail,
                container, false);
        if (book != null)
        {
            // 让book_title文本框显示book对象的title属性
            ((TextView) rootView.findViewById(R.id.book_title))
                    .setText(book.title);
            // 让book_desc文本框显示book对象的desc属性
            ((TextView) rootView.findViewById(R.id.book_desc))
                .setText(book.desc);
        }
        return rootView;
    }

FragmentTransaction调用commit()方法之后,要你重新调用fragmentManager的beginTransaction()方法

 

    fragmentManager=getFragmentManager();

    abnormalFragment=new ExecuteAbnormalFragment();
    normalFragment = new ExecuteNormalFragment();

    status=(RadioGroup)findViewById(R.id.status);
    status.setOnCheckedChangeListener(new OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup arg0, int checkedId) {
            fragmentTransaction=fragmentManager.beginTransaction();
            if(checkedId==R.id.abnormal){
                Toast.makeText(getApplicationContext(), "不正常", Toast.LENGTH_SHORT).show();
                fragmentTransaction.replace(R.id.status_show, abnormalFragment);
/整体语句执行方法           getFragmentManager().beginTransaction().replace(R.id.status_show, abnormalFragment).commit();

            }else{
                Toast.makeText(getApplicationContext(), "正常", Toast.LENGTH_SHORT).show();
                fragmentTransaction.replace(R.id.status_show, normalFragment);
/                   getFragmentManager().beginTransaction().replace(R.id.status_show, normalFragment).commit();
            }

            fragmentTransaction.commit();
        }
    });

}