Android 10-fragment, Android-fragment

Source: Internet
Author: User

Android 10-fragment, Android-fragment
Android 10-day notes-fragmentFragment (Fragment) I. Fragment Introduction

* Fragment is an API introduced in 3.0, mainly to solve the display problem of tablets and large screen mobile phones.

* Fragment represents the sub-module of the Activity. Therefore, fragment can be understood as a part of the Activity.

* Fragment must be used in an embedded Activity.

2. Step 3 of creating Fragment use fragment use Activity

* Create a layout to fill in fragment

<? Xml version = "1.0" encoding = "UTF-8"?> <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" android: layout_width = "match_parent" android: layout_height = "match_parent" android: orientation = "vertical"> <TextView android: layout_width = "match_parent" android: layout_height = "wrap_content" android: text = "sound size"/> <TextView android: layout_width = "match_parent" android: layout_height = "wrap_content" android: text = "Speed"/> <TextView android: layout_width = "match_parent" android: layout_height = "wrap_content" android: text = "3D"/> <TextView android: layout_width = "match_parent" android: layout_height = "wrap_content" android: text = "left channel"/> <TextView android: layout_width = "match_parent" android: layout_height = "wrap_content" android: text = "right channel"/> </LinearLayout>

 

* Create a fragement public class SoundFragment extends Fragment {

@Nullable@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {    View view=inflater.inflate(R.layout.sound_item,null) ;    return view;}

 

* Main Interface Layout

<? Xml version = "1.0" encoding = "UTF-8"?> <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" android: layoutwidth = "matchparent" android: layoutheight = "matchparent" android: orientation = "vertical"> <! -- Container --> <FrameLayoutandroid: id = "@ + id/fl_container" android: layout_width = "match_parent" android: layout_height = "0dp" android: layout_weight = "3"> </FrameLayout> <LinearLayout android: layout_width = "match_parent" android: layout_height = "wrap_content"> <Button android: onClick = "sound" android: layout_width = "0dp" android: layout_weight = "1" android: layout_height = "wrap_content" android: text = "sound"/> </LinearLayout>

 

* Activity

/*** Click the sound button to display fragment * @ param v */public void sound (View v) {// declare Fragment SoundFragment soundFragment = new SoundFragment (); // get the Fragment manager FragmentManager = getFragmentManager (); // start the transaction FragmentTransaction transaction = manager. beginTransaction (); // Replace the transaction of the frame layout container in the current layout. replace (R. id. fl_container, soundFragment); // submit the transaction. commit ();}

 

4. Lifecycle
  • OnAttach --- used to establish a connection and disconnect with Acivity. When this Fragment is added to the Activity, it is called only once.
  • OnCreate --- called when creating Fragment
  • OnCreateView -- it is called every time Fragment is created.
  • OnActivityCreated: called when the Activity in which Fragment is located is started
  • OnStart: called when Fragment is started
  • OnResume: it is called back when the Fragment is restored and will be called after the onStart method.
  • OnPause: callback when Fragment is suspended
  • OnStop: callback when Fragment is stopped
  • OnDestroyView: create and destroy a view
  • Ondescloud: used for initialization and destruction, the same as in the Activity.
  • OnDetach: Delete the Fragment from the Activity. Call this method when the replacement is complete. Call this method after the onDestroy method.
Comparison between Activity and Fragment Lifecycle
Activity--------------------Fragment                            onAttach()                            onCreate()                            onCreateView()onCreate()                  onActivityCreatedonStart()                   onStart()onResume()                 onResume()onPause()                  onPause()onStop()                   onStop()                           onDestoryView()                           onDestory()onDestory()                onDetach()

 

 

 

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