Two ways to use Android learning notes fragment

One, the first method:

(1) The first way to use fragment is to load a separate layout file using fragment: (That is, the way XML is implemented)

The structure is as follows:

Activity_main.xml is mainly to add two linear layouts in a linear layout

<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:orien tation= "Horizontal" tools:context= ". Mainactivity "> <linearlayout android:id=" @+id/linerlayout1 "android:layout_width=" 0DP "Android oid:layout_height= "Match_parent" android:layout_weight= "1" android:background= "#CCCCCC" Android:orien tation= "vertical" > <button android:id= "@+id/button1" android:layout_width= "Match_paren T "android:layout_height=" wrap_content "android:text=" display window "/> </LinearLayout> <li Nearlayout android:id= "@+id/linerlayout2" android:layout_width= "0DP" android:layout_height= "Match_par Ent "android:layout_weight=" 3 "android:background=" #CCFFDD "android:orientation=" vertical "> &L T;/lineaRlayout></linearlayout> 

Right.xml is a layout file that is loaded when the fragment is used: (because it is loaded in the interface, so no special requirements)

<?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:o rientation= "vertical" >    <ratingbar        android:id= "@+id/ratingbar1" android:layout_width= "Wrap_        Content "        android:layout_height=" wrap_content "/>    <button        android:id=" @+id/button11        " Android:layout_width= "Wrap_content"        android:layout_height= "wrap_content"        android:text= "point I'll Try"/> </LinearLayout>

Myfragment.java is the class that loads fragment, to inherit the Fragment class: (To reload the three methods below the parent class)

Package Com.lc.tablet_fragment_addview;import Android.app.fragment;import Android.os.bundle;import Android.view.layoutinflater;import Android.view.view;import Android.view.view.onclicklistener;import Android.view.viewgroup;import Android.widget.button;import Android.widget.toast;public class MyFragment extends Fragment {public myfragment () {//TODO auto-generated constructor stub} @Overridepublic void OnCreate (Bundle Savedinstancestate) {//TODO auto-generated method Stubsuper.oncreate (savedinstancestate);} @Overridepublic View Oncreateview (layoutinflater inflater, ViewGroup container,bundle savedinstancestate) {// The r.layout.right here is the interface of Idview view = inflater.inflate (r.layout.right, NULL); Button button = (button) View.findviewbyid (r.id.button11); Button.setonclicklistener (new Onclicklistener () {@ overridepublic void OnClick (View v) {toast.maketext (getactivity (), "Hello world!", Toast.length_long). Show ();}); return view;} @Overridepublic void OnPause () {//TODO auto-generated method Stubsuper. OnPause ();}} 

Mainactivity.java:

Package Com.lc.tablet_fragment_addview;import Android.app.activity;import Android.app.fragmentmanager;import Android.app.fragmenttransaction;import Android.os.bundle;import Android.view.menu;import Android.view.View;import Android.view.view.onclicklistener;import Android.widget.button;public class Mainactivity extends Activity {private Button button;private Fragmentmanager Fragmentmanager; Manage Private fragmenttransaction fragmenttransaction; Transaction @overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_main); button = (button) This.findviewbyid (r.id.button1); Fragmentmanager = Getfragmentmanager (); Button.setonclicklistener (New Onclicklistener () {@Overridepublic void OnClick (View v) {fragmenttransaction = Fragmentmanager.begintransaction (); Myfragment myfragment = new Myfragment ();//The first parameter is the ID to which to place, and the second is the Fragmentfragmenttransaction.add to be placed ( R.id.linerlayout2, myfragment); Fragmenttransaction.commit ();}}); @OverridepubliC Boolean oncreateoptionsmenu (Menu menu) {//Inflate the menu; This adds items to the action bar if it is Present.getmenui Nflater (). Inflate (R.menu.main, menu); return true;}}

Demo Effect: Displays the layout on the right when you click on the button on the gray screen:

The second method is similar to the one in the project structure: just use the fragment control directly in the layout file:

<relativelayout 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:paddingbottom= "@dimen/activity_vertical_margin"    android:paddingleft= "@dimen/activity_ Horizontal_margin "    android:paddingright=" @dimen/activity_horizontal_margin "    android:paddingtop=" @dimen /activity_vertical_margin "    tools:context=". Mainactivity ">    <fragment        android:id=" @+id/fragment1 "        android:name=" com.example.tablet_ Fragment_fragementmanager. Myfragment "        android:layout_width=" wrap_content "        android:layout_height=" Wrap_content "        android: Layout_alignparenttop= "true"        android:layout_centerhorizontal= "true"        android:layout_margintop= "37DP"/ ></RelativeLayout>

In the Myfragment.java file, you only need to find the layout file that the fragment accommodates, without doing business:

Package Com.example.tablet_fragment_fragementmanager;import Android.app.fragment;import Android.os.Bundle;import Android.view.layoutinflater;import Android.view.view;import Android.view.viewgroup;public class MyFragment extends Fragment {public myfragment () {} @Overridepublic void OnCreate (Bundle savedinstancestate) {super.oncreate ( Savedinstancestate);} @Overridepublic View Oncreateview (layoutinflater inflater, ViewGroup container,bundle savedinstancestate) {/* * Just find the layout file here */view view = inflater.inflate (R.layout.text, null); return view;} @Overridepublic void Onresume () {Super.onresume ();}}

Mainactivity.java file: Business processing for fragment

Package Com.example.tablet_fragment_fragementmanager;import Android.app.activity;import Android.app.fragmentmanager;import Android.os.bundle;import Android.view.menu;import Android.view.View;import Android.view.view.onclicklistener;import Android.widget.button;import android.widget.toast;/* * Drag a fragment into the layout file , use the method below to find a specific fragment * do not need to use the BeginTransaction method */public class Mainactivity extends Activity {private myfragment Fragment;private fragmentmanager fragmentmanager;private button button, @Overrideprotected void OnCreate (Bundle Savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_main); FragmentManager = Getfragmentmanager ();//use Fragmentmanager to find fragment, use ID as unique identifier fragment = (myfragment) Fragmentmanager.findfragmentbyid (r.id.fragment1);//or use the method below to find fragment//fragment = (myfragment) Fragmentmanager.findfragmentbytag ("Fragment1");//Find the button Button1button = (button) Fragment.getview () in the fragment layout. Findviewbyid (R.id.button1); Button.setonclicklistener (NEW Onclicklistener () {@Overridepublic void OnClick (View v) {toast.maketext (mainactivity.this, "Hello world!", Toast.length_short). Show ();}}); @Overridepublic boolean Oncreateoptionsmenu (Menu menu) {getmenuinflater (). Inflate (R.menu.main, menu); return true;}}

Two ways to use Android learning notes fragment