The creation process of fragment subclasses and their preferencefragment in Android demo _android

Fragment How to create
There are two ways to use fragment: Static mode and dynamic mode.
1. Static mode
First step: Define a fragment subclass first.

public class Examplefragment extends Fragment {

  @Override public
  View Oncreateview (Layoutinflater inflater, ViewGroup container, 
      Bundle savedinstancestate) {return
    inflater.inflate (r.layout.example_fragment, container, False);
  }  

Description: Examplefragment is a subclass of fragment, and its layout definition is Example_fragment.xml file.
Step Two: Define the layout file for the fragment subclass.

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android=
"http://schemas.android.com/apk/" Res/android "
  xmlns:tools=" Http://schemas.android.com/tools "
  android:layout_width=" Match_parent
  " android:layout_height= "Match_parent"
  android:orientation= "Horizontal" >

  <edittext android:id= "@+id" /edit_message "
    android:layout_width=" 0DP "
    android:layout_height=" wrap_content "
    android:layout_ weight= "1"
    android:hint= "@string/edit_message"/>

  <button android:layout_width=
    "Wrap_ Content "
    android:layout_height=" wrap_content "
    android:text=" "@string/button_send"
    android:o nclick= "SendMessage"/>

</LinearLayout>

Description: Above is the content of Example_fragment.xml.
Step three: Use the fragment in the layout that needs to be used for the fragment activity.
Here's the code that references the fragment activity:

The public class Fragmentlayouttest extends activity {/** called the ' when ' is the ' The activity ' is the ' the '
  ---'
  @Override Public
  void OnCreate (Bundle savedinstancestate)
  {
    super.oncreate (savedinstancestate);
    Setcontentview (R.layout.main); 
  } 

Here's what the Main.xml:

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android=
"http://schemas.android.com/apk/" Res/android "
  android:orientation=" vertical "
  android:layout_width=" fill_parent "
  android:layout_" height= "Fill_parent"
  >
  <textview
    android:layout_width= "fill_parent"
    android:layout_ height= "Wrap_content"
    android:text= "@string/fragment_intro"
    /> <fragment android:name=

  " Com.skw.fragmentlayouttest.ExampleFragment "
    android:id=" @+id/frag_example "
    android:layout_weight=" 1 "
    android:layout_width= "match_parent"
    android:layout_height= "match_parent"/>

</ Linearlayout>

Description: In this layout file, a previously customized examplefragment is called.
Click to view: Static mode full source
2. Dynamic mode
repeat the first and second steps above to implement a fragment subclass.
Step three: Define a framelayout in the layout that needs to be used for the fragment activity.

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android=
"http://schemas.android.com/apk/" Res/android "
  android:orientation=" vertical "
  android:layout_width=" fill_parent "
  android:layout_" height= "Fill_parent"
  >

  <textview
    android:layout_width= "fill_parent"
    android:layout_ height= "Wrap_content"
    android:text= "@string/fragment_intro"
    />

  <framelayout
    android: Id= "@+id/frag_example"
    android:layout_width= "match_parent" android:layout_height= "match_parent"
    />

</LinearLayout>

Step Fourth: In the activity, populate the fragment into the framelayout.

public class Fragmentlayouttest extends activity {

  @Override
  protected void onCreate (Bundle savedinstancestate ) {
    super.oncreate (savedinstancestate);
    Setcontentview (r.layout.main);

    Get Fragmentmanager
    Fragmentmanager Fragmentmanager = Getfragmentmanager ();
    Get fragmenttransaction    
    fragmenttransaction fragmenttransaction = fragmentmanager.begintransaction ();

    Get examplefragment
    examplefragment fragment = new Examplefragment ();
    Add the fragment to the container frag_example
    fragmenttransaction.add (r.id.frag_example, fragment);
    Fragmenttransaction.commit ();
  }

Preferencefragment Use instructions
1. Create a configuration file
new Res/xml/preferences.xml, which reads as follows:

<preferencescreen xmlns:android= "Http://schemas.android.com/apk/res/android" > <preferencecategory androi
     D:title= "Preferencecategory a" > <!--(a) Android:key is Preferece's ID (s) android:title is a big title for Preferece
      (Android:summary) is the preferece--> <checkboxpreference android:key= "Checkbox_preference" Android:title= "Title_checkbox_preference" android:summary= "summary_checkbox_preference"/> </PreferenceC ategory> <preferencecategory android:title= "Preferencecategory B" > <!--android:dialogtitle is
      The title Android:defaultvalue the dialog box is the default value--> <edittextpreference android:key= "Edittext_preference" Android:title= "title_edittext_preference" android:summary= "null" android:dialogtitle= "dialog_title_edittext_p Reference "android:defaultvalue=" null/> <!--android:entries is a description of the items in the list android:entryvalues is the list The value of the items in-->; Listpreference android:key= "list_preference" android:dialogtitle= Choose font "android:entries=" @arra Y/pref_font_types "android:entryvalues=" @array/pref_font_types_values "android:summary=" sans "Android : title= "Font" android:defaultvalue= "sans"/> </PreferenceCategory> <preferencecategory Androi d:title= Preferencecategory C > <switchpreference android:key= switch_preferece android:title= Le_switch_preferece "android:defaultvalue=" true "/> <seekbarpreference android:key=" Seekbar_prefere nCE "android:title=" title_seekbar_preference "android:max=" android:defaultvalue= ""/> </

 Preferencecategory> </PreferenceScreen>

Description: Many of the preferencefragment components, including Checkboxpreference, Edittextpreference, Listpreference, Switchpreference, Seekbarpreference, Volumepreference and so on. The properties of these builds are defined as follows. The
(Android:key) is the ID of the preferece, which is the unique identifier of the preferece. The
(android:title) is a preferece headline. The
(android:summary) is a preferece of a small caption. The
(android:dialogtitle) is the title of the dialog box. The
(android:defaultvalue) is the default value. The
(android:entries) is a description of the items in the list. The
(android:entryvalues) is the value of the items in the list.
Note: Switchpreference is supported by API (ANDROID4.0). Therefore, to use switchpreference, you must define the minimum version of APK support in manifest.
<uses-sdk android:minsdkversion=/>
2 custom preferencefragment

public class Prefsfragment extends Preferencefragment implements Sharedpreferences.onsharedpreferencechangelistener,

  Preference.onpreferenceclicklistener {private static final String TAG = "# #PrefsFragment # #";
  private static final String check_preference = "Checkbox_preference";
  private static final String edittext_preference = "Edittext_preference";
  private static final String list_preference = "List_preference";
  private static final String switch_preference = "Switch_preferece";

  private static final String seekbar_preference = "Seekbar_preference";
  Private preference Medittext;

    @Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);

    Load the preferences from XML resource Addpreferencesfromresource (r.xml.preferences);
    Medittext = (preference) findpreference (edittext_preference);
  Medittext.setonpreferenceclicklistener (this); @Override public void onsharedpreferencechanged (SharedpreFerences sharedpreferences, String key) {//Set summary to is the user-description for the selected value Prefere
    nce connectionpref = findpreference (key);
      if (Key.equals (Check_preference)) {Boolean checked = Sharedpreferences.getboolean (key, false);
    LOG.D (TAG, "checkbox:checked=" +checked);
      else if (key.equals (edittext_preference)) {String value = sharedpreferences.getstring (Key, "");
      Connectionpref.setsummary (value);
    LOG.D (TAG, "edittext:value=" +value);
      else if (key.equals (list_preference)) {String value = sharedpreferences.getstring (Key, "");
      Connectionpref.setsummary (value);
    LOG.D (TAG, "list:value=" +value);
      else if (key.equals (Switch_preference)) {Boolean checked = Sharedpreferences.getboolean (key, false);
    LOG.D (TAG, "switch:checked=" +checked);
      else if (key.equals (seekbar_preference)) {int value = Sharedpreferences.getint (key, 0);
LOG.D (TAG, "seekbar:value=" +value);    @Override public boolean Onpreferenceclick (preference preference) {Sharedpreferences sharedpreference
    s = preference.getsharedpreferences ();
    String value = sharedpreferences.getstring (Preference.getkey (), "");

    LOG.D (TAG, "onpreferenceclick:value=" +value);
  return true;
    @Override public void Onresume () {super.onresume ();

  Getpreferencemanager (). Getsharedpreferences (). Registeronsharedpreferencechangelistener (this); @Override public void OnPause () {Getpreferencemanager (). Getsharedpreferences (). Unregisteronsharedpreferencecha
    Ngelistener (this);
  Super.onpause ();

 }
}

Description: Each item in the Preferencefragment is a Sharedpreferences object that is stored as a sharedpreferences in the APK's private data area. There are a number of ways to listen for members in a preferencefragment, and two common types are:
(01) Monitoring data changes: By implementing the Sharedpreferences.onsharedpreferencechangelistener interface, to monitor the data changes in each item in the Preferencefragment.
(02) Monitoring Click event: By implementing Preference.onpreferenceclicklistener interface, to monitor the preferencefragment of each item in the Click action.
3. Use of Preferencefragment
a preferencefragment has been defined earlier. Next, you can instantiate its object and display it in the activity.

public class Fragmenttest extends activity {

  @Override public
  void OnCreate (Bundle savedinstancestate) {
    Super.oncreate (savedinstancestate);
    Setcontentview (r.layout.main);

    Getfragmentmanager (). BeginTransaction (). Replace (Android. R.id.content, 
        new Prefsfragment ()). commit (); 
  }