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This article introduces the knowledge of "how to use Activity and Fragment to transfer data in Android". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. The first and most commonly used way is to use Bundle to pass parameters

MyFragment myFragment = new MyFragment (); Bundle bundle = new Bundle (); bundle.putString ("DATA", values); / / the values here is the value we want to pass myFragment.setArguments (bundle)

Then in the onCreatView method in Fragment, get the bundle object through the getArgments () method, and then get the value we passed through the key value of getString.

2. The second way is to define the method in the host Activity, pass the value to Fragment, and get this value in the onAttach method in Fragment.

/ / getTitles () method in host activity public String getTitles () {return "hello";} / onAttach method in Fragment @ Override public void onAttach (Activity activity) {super.onAttach (activity); titles = ((MainActivity) activity). GetTitles ();} / / the passed data can be obtained by forcibly converting it to host activity.

3. The following is an extension to create Fragment and pass values

If we don't need to pass a numeric value, we can directly create a fragment in the host activity as usual, but if we need to pass data, we can use the newInstance (data) method, which is defined by ourselves, but is a static method defined in Fragment.

Static MyFragment newInstance (String s) {MyFragment myFragment = new MyFragment (); Bundle bundle = new Bundle (); bundle.putString ("DATA", s); myFragment.setArguments (bundle); return myFragment;} / / again, get this value @ Nullable @ Override public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {View view = inflater.inflate (R.layout.layoutfragment.container.false); Bundle bundle = getArguments () String data = bundle.getString ("DATA"); tv = (TextView) view.findViewById (R.id.id_fm_tv); if (data! = null) {tv.setText (data);} return view;}

In the host activity, create a Fragment

FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction (); fragmentTransaction.setCustomAnimations (android.R.anim.fade_in,android.R.anim.fade_out); fragment1 = MyFragment.newInstance ("this is the first fragment"); / / just call this method directly to create a fragment fragment2 = MyFragment.newInstance ("this is the second fragment"); fragment3 = MyFragment.newInstance ("this is the third fragment") That's all for "how to use Activity and Fragment to transfer data in Android". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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