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Android - 封装Fragment不依赖于Activity

封装Fragment不依赖于Activity


本文地址:http://blog.csdn.net/caroline_wendy


Fragment直接托管activity的intent会破坏Fragment的封装性。


可以使用newInstance()的静态方法,完成fragment实例及bundle对象的创建,

然后将argument放入bundle中,最后再附加给fragment.


newInstance代码:

    public static CrimeFragment newInstance(UUID crimeId) {
        Bundle args = new Bundle();
        args.putSerializable(EXTRA_CRIME_ID, crimeId);
        CrimeFragment fragment = new CrimeFragment();
        fragment.setArguments(args);

        return fragment;
    }

Activity创建Fragment:

    protected Fragment createFragment() {
//        return new CrimeFragment();
        UUID crimeId = (UUID)getIntent().getSerializableExtra(CrimeFragment.EXTRA_CRIME_ID);
        return CrimeFragment.newInstance(crimeId);
    }

获取Argument数据:

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
//        UUID crimeId = (UUID)getActivity().getIntent().getSerializableExtra(EXTRA_CRIME_ID);
        UUID crimeId = (UUID)getArguments().getSerializable(EXTRA_CRIME_ID);
        mCrime = CrimeLab.get(getActivity()).getCrime(crimeId); //依赖activity获取crime
    }





Android - 封装Fragment不依赖于Activity