Android Combat Simple Tutorial-52nd gun (communication between fragment and activity)

The use of fragment can make our application more flexible to adapt to various types of Android devices, but for fragment and activity between the communication, a lot of friends should be more unfamiliar, below we have an example to see how to achieve.

First, Activity->fragment pass data1.main.xml:

<linearlayout xmlns:android= "http://schemas.android.com/apk/res/android"    xmlns:tools= "http// Schemas.android.com/tools "    android:layout_width=" match_parent "    android:id=" @+id/rl_fragment    " android:orientation= "vertical"    android:layout_height= "match_parent" >    <edittext        android:id= "@ +id/et_input "        android:layout_width=" match_parent "        android:layout_height=" wrap_content "/>    < Button        android:id= "@+id/btn_send"        android:layout_width= "wrap_content"        android:layout_height= " Wrap_content "        android:text=" send "/></linearlayout>

2.fragment.xml:

<?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" >    <textview        android:id= "@+id/tv_fragment" android:layout_height= "Wrap_        Content "        android:layout_width=" wrap_content "        /></linearlayout>

3.mainactivity.java:

Package Com.example.fragementcommunication;import Android.app.activity;import Android.app.fragmentmanager;import Android.app.fragmenttransaction;import Android.os.bundle;import Android.view.view;import Android.view.view.onclicklistener;import Android.view.window;import Android.widget.button;import Android.widget.edittext;import Android.widget.toast;public class Mainactivity extends Activity {private EditText Mmainactivityet;private Button Msendbutton; @Overrideprotected void OnCreate (Bundle savedinstancestate) { Super.oncreate (savedinstancestate); Requestwindowfeature (Window.feature_no_title); SetContentView ( R.layout.activity_main); Mmainactivityet = (EditText) Findviewbyid (r.id.et_input); Msendbutton = (Button) Findviewbyid (r.id.btn_send); Msendbutton.setonclicklistener (new Onclicklistener () {@Overridepublic void OnClick (View v) {String Text = Mmainactivityet.gettext (). toString (); Myfragment myfragment = new Myfragment (); Bundle bundle = new bundle (); Bundle.putstring ("Input", text); myfragment.Setarguments (bundle);//pass Stringfragmentmanager Manager = Getfragmentmanager (); Fragmenttransaction transaction = Manager.begintransaction (); Transaction.add (R.id.rl_fragment, Myfragment, " Myfragment "); Transaction.commit (); Toast.maketext (Mainactivity.this, "Send data to Fragment" + text, Toast.length_short). Show ();}});}}

4.myfragment.java:

Package Com.example.fragementcommunication;import Android.app.fragment;import Android.os.bundle;import Android.view.layoutinflater;import Android.view.view;import Android.view.viewgroup;import Android.widget.TextView Import Android.widget.toast;public class Myfragment extends Fragment {@Overridepublic View oncreateview ( Layoutinflater inflater, ViewGroup container, Bundle savedinstancestate) {View view = Inflater.inflate (R.layout.fragmet , null); TextView Mfragmenttextview = (TextView) View.findviewbyid (r.id.tv_fragment); String string = Getarguments (). getString ("input");//Get Data; Mfragmenttextview.settext (string); Toast.maketext (Getactivity (), "Fetch data successfully" + String, Toast.length_short). Show (); return view;}}

Summary : Send data method->setarguments (bundle)Receive Data Method->getarguments ()
let's look at the effect:


Second, fragment to the activity value (interface callback mode)layout file As above, let's look at the changes in the Java code:1.mainactivity.java:

Package Com.example.fragementcommunication;import Com.example.fragementcommunication.MyFragment.MyListener; Import Android.app.activity;import Android.app.fragmentmanager;import Android.app.fragmenttransaction;import Android.os.bundle;import Android.view.view;import Android.view.view.onclicklistener;import Android.view.Window; Import Android.widget.button;import Android.widget.edittext;import Android.widget.toast;public class MainActivity Extends Activity implements Mylistener{private EditText mmainactivityet;private Button Msendbutton; @Overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Requestwindowfeature (window.feature_ No_title); Setcontentview (r.layout.activity_main); Mmainactivityet = (EditText) Findviewbyid (r.id.et_input); Msendbutton = (Button) Findviewbyid (r.id.btn_send); Msendbutton.setonclicklistener (new Onclicklistener () {@ overridepublic void OnClick (View v) {String text = Mmainactivityet.gettext (). toString (); Myfragment myfragment = newMyfragment (); Bundle bundle = new bundle (); Bundle.putstring ("Input", text); myfragment.setarguments (bundle);// Pass Stringfragmentmanager Manager = Getfragmentmanager (); Fragmenttransaction transaction = Manager.begintransaction (); Transaction.add (R.id.rl_fragment, Myfragment, " Myfragment "); Transaction.commit (); Toast.maketext (Mainactivity.this, "Send data to Fragment" + text, Toast.length_short). Show ();});} @Overridepublic Void callback (String back) {Toast.maketext (mainactivity.this, "Get data from fragment" + Back, Toast.length_short). Show ();}}

2.myfragment.java:

Package Com.example.fragementcommunication;import Android.app.activity;import Android.app.fragment;import Android.os.bundle;import Android.view.layoutinflater;import Android.view.view;import Android.view.ViewGroup; Import Android.widget.textview;import Android.widget.toast;public class Myfragment extends Fragment {public MyListener Listener;private String back= "has received data! Thank you ";/** * Transfer value from fragment to activity via interface callback; * @author Administrator * */public interface mylistener{public void Callback (STR ing back); @Overridepublic void Onattach (activity activity) {Super.onattach (activity); listener= (MyListener) Activity;} @Overridepublic View Oncreateview (layoutinflater inflater, ViewGroup container, Bundle savedinstancestate) {View view = I Nflater.inflate (R.layout.fragmet, NULL); TextView Mfragmenttextview = (TextView) View.findviewbyid (r.id.tv_fragment); String string = Getarguments (). getString ("input");//Get Data; Mfragmenttextview.settext (string); Toast.maketext (Getactivity (), "Fetch data successfully" + String, Toast.length_short). Show (); Toast.maketext (Getactivity (), "passing data to activity" + back, Toast.length_short). Show (); Listener.callback (back); return View;}}

Run as follows:

at this point we can see that first mainactivity to fragment 123, and then fragment to the activity "has received the data!" Thank you. "
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Android Combat Simple Tutorial-52nd gun (communication between fragment and activity)