blocks|key|646309|text|@Override
public+View+onCreateView(LayoutInflater+inflater,+ViewGroup+container,
++++++++Bundle+savedInstanceState)+{
++++Bundle+b+=+getActivity().getIntent().getExtras();
++++++++++++wid+=+b.getString("wid");
++++++++++++rid+=+b.getString("rid");
++++++++++++View+view+=+inflater.inflate(R.layout.categoryfragment,+container,+false);
++++return+view;
+}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|646310|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
 Bundle savedInstanceState) {
 Bundle b = getActivity().getIntent().getExtras();
 wid = b.getString("wid");
 rid = b.getString("rid");
 View view = inflater.inflate(R.layout.categoryfragment, container, false);
 return view;
 }
</code></pre>

blocks|key|646381|text|我使用了一个实现日期侦听器的AppCompatActivity。片段是必需的，因为我需要编写一个日期范围选择器。我还需要容器接收选定的日期，以便将它们返回到父活动。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|646382|对于容器活动，这是类声明：|646383|public+class+AppCompatDateRange+extends+AppCompatActivity+implements
++++DateIniRangeFragment.OnDateIniSelectedListener,+DateFimRangeFragment.OnDateFimSelectedListener|code-block|syntax|javascript|646384|以及回调的接口：|646385|@Override
public+void+onDateIniSelected(String+dataIni)+{
++++Log.i("data+inicial:",+dataIni);
}

@Override
public+void+onDateFimSelected(String+dataFim)+{
++++Log.i("data+final:",+dataFim);
}|646386|回调是字符串，因为日期是select查询中的参数。|646387|片段的代码(基于初始日期片段)：|646388|public+class+DateIniRangeFragment+extends+Fragment+{
OnDateIniSelectedListener+callbackIni;

private+DatePicker+startDatePicker;

public+DateIniRangeFragment()+{
++++///required+empty+constructor
}

@Override
public+void+onCreate(Bundle+savedInstanceState)+{
++++super.onCreate(savedInstanceState);
}

///through+this+interface+the+fragment+sends+data+to+the+container+activity
public+interface+OnDateIniSelectedListener+{
++++void+onDateIniSelected(String+dataIni);
}

@Override
public+View+onCreateView(LayoutInflater+inflater,+ViewGroup+container,+Bundle+savedInstanceState)+{
++++///layout+for+the+fragment
++++View+v+=+inflater.inflate(R.layout.date_ini_fragment,+container,+false);

++++///initial+date+for+the+picker,+in+this+case,+current+date
++++startDatePicker+=+(DatePicker)+v.findViewById(R.id.start_date_picker_appcompat);
++++Calendar+c+=+Calendar.getInstance();
++++int+ano+=+c.get(Calendar.YEAR);
++++int+mes+=+c.get(Calendar.MONTH);
++++int+dia+=+c.get(Calendar.DAY_OF_MONTH);
++++startDatePicker.setSpinnersShown(false);
++++startDatePicker.init(ano,+mes,+dia,+dateSetListener);

++++return+v;
}

///listener+that+receives+the+selected+date
private+DatePicker.OnDateChangedListener+dateSetListener+=+new+DatePicker.OnDateChangedListener()+{
++++public+void+onDateChanged(DatePicker+view,+int+year,+int+monthOfYear,+int+dayOfMonth)+{
++++++++if+(view.isShown())+{+///if+the+datepicker+is+on+the+screen
++++++++++++String+sDataIni+=+year+%2B+"-"+%2B+(monthOfYear+%2B+1)+%2B+"-"+%2B+dayOfMonth;
++++++++++++callbackIni.onDateIniSelected(sDataIni);+//apply+date+to+callback,+string+format
++++++++}
++++}
};

@Override
public+void+onAttach(Activity+activity)+{
++++super.onAttach(activity);

++++/*
++++*+this+function+guarantees+that+the+container+activity+implemented+the+callback+interface
++++*+*/
++++try+{
++++++++callbackIni+=+(OnDateIniSelectedListener)+activity;
++++}+catch+(ClassCastException+e)+{
++++++++throw+new+ClassCastException(activity.toString()+%2B+"+deve+implementar+OnDateIniSelectedListener");
++++}
}|646389|}|646390|为了组合容器%2B片段，我使用了一个带有扩展FragmentPagerAdapter的自定义类的ViewPager+(AppCompat)。没有对话框。|646391|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|14|8|@]|9|@]|A|$]]|$1|Q|3|R|5|F|7|15|8|@]|9|@]|A|$G|H]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|17|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

I used an AppCompatActivity that implements Date Listeners. Fragments came as a necessity since I needed to code a date range selector. And I also needed the container to receive the selected dates to return them to the parent activity.

For the container activity, this is the class declaration: 

<pre><code>public class AppCompatDateRange extends AppCompatActivity implements
 DateIniRangeFragment.OnDateIniSelectedListener, DateFimRangeFragment.OnDateFimSelectedListener
</code></pre>

And the interfaces for the callbacks:

<pre><code>@Override
public void onDateIniSelected(String dataIni) {
 Log.i("data inicial:", dataIni);
}

@Override
public void onDateFimSelected(String dataFim) {
 Log.i("data final:", dataFim);
}
</code></pre>

The callbacks are strings because dates are params in an query select.

The code for the fragments (based on the initial date fragment):

<pre><code>public class DateIniRangeFragment extends Fragment {
OnDateIniSelectedListener callbackIni;

private DatePicker startDatePicker;

public DateIniRangeFragment() {
 ///required empty constructor
}

@Override
public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
}

///through this interface the fragment sends data to the container activity
public interface OnDateIniSelectedListener {
 void onDateIniSelected(String dataIni);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 ///layout for the fragment
 View v = inflater.inflate(R.layout.date_ini_fragment, container, false);

 ///initial date for the picker, in this case, current date
 startDatePicker = (DatePicker) v.findViewById(R.id.start_date_picker_appcompat);
 Calendar c = Calendar.getInstance();
 int ano = c.get(Calendar.YEAR);
 int mes = c.get(Calendar.MONTH);
 int dia = c.get(Calendar.DAY_OF_MONTH);
 startDatePicker.setSpinnersShown(false);
 startDatePicker.init(ano, mes, dia, dateSetListener);

 return v;
}

///listener that receives the selected date
private DatePicker.OnDateChangedListener dateSetListener = new DatePicker.OnDateChangedListener() {
 public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
 if (view.isShown()) { ///if the datepicker is on the screen
 String sDataIni = year + "-" + (monthOfYear + 1) + "-" + dayOfMonth;
 callbackIni.onDateIniSelected(sDataIni); //apply date to callback, string format
 }
 }
};

@Override
public void onAttach(Activity activity) {
 super.onAttach(activity);

 /*
 * this function guarantees that the container activity implemented the callback interface
 * */
 try {
 callbackIni = (OnDateIniSelectedListener) activity;
 } catch (ClassCastException e) {
 throw new ClassCastException(activity.toString() + " deve implementar OnDateIniSelectedListener");
 }
}
</code></pre>

}

To compose the container + fragments, I used an ViewPager (AppCompat) with a custom class that extends FragmentPagerAdapter. No dialogs.

blocks|key|646505|text|我不知道这是不是最好的方法，但是我已经在google上搜索了很长一段时间，发现如何将Bundle从一个片段传递到它的容器activity，但我找到的只是将数据从一个activity发送到另一个片段(这对我来说有点困惑，因为我是一个新手)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|646506|后来，我尝试了一些我自己的东西，完全按照我想要的那样工作。所以我会把它贴在这里，以防像我这样的人在寻找同样的东西。|646507|//从Fragment传入数据|646508|Bundle+gameData+=+new+Bundle();
++++++++gameData.putStringArrayList(Constant.KEY_PLAYERS_ARR,players);
++++++++gameData.putString(Constant.KEY_TEAM_NAME,custom_team_name);
++++++++gameData.putInt(Constant.KEY_REQUESTED_OVER,requestedOver);

++++++++Intent+intent+=+getActivity().getIntent();
++++++++intent.putExtras(gameData);|code-block|syntax|javascript|646509|//从bundle的容器活动中获取数据。|646510|Bundle+gameData+=+getIntent().getExtras();
++++++++if+(gameData+!=+null)
++++++++{
++++++++++++int+over+=+gameData.getInt(Constant.KEY_REQUESTED_OVER);
++++++++++++ArrayList<String>+players+=+gameData.getStringArrayList(Constant.KEY_PLAYERS_ARR);
++++++++++++String+team+=+gameData.getString(Constant.KEY_TEAM_NAME);

++++++++}
++++++++else+if+(gameData+==+null)
++++++++{
++++++++++++Toast.makeText(this,+"Bundle+is+null",+Toast.LENGTH_SHORT).show();
++++++++}|646511|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|T|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|V|8|@]|9|@]|A|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I don't know if this is the best way or not
Bu I have been searching on google for quite a while finding how can I pass a Bundle from a fragment to its container activity but all I found was sending data from activity to fragment instead (which was a bit confusing for me as I'm a newbie).

later I tried something own my own that exactly worked for me as I wanted. so I'll post it here case someone like me looking for the same thing.

// Passing data from Fragment .

<pre><code>Bundle gameData = new Bundle();
 gameData.putStringArrayList(Constant.KEY_PLAYERS_ARR,players);
 gameData.putString(Constant.KEY_TEAM_NAME,custom_team_name);
 gameData.putInt(Constant.KEY_REQUESTED_OVER,requestedOver);

 Intent intent = getActivity().getIntent();
 intent.putExtras(gameData);
</code></pre>

// Getting data from the bundle from it's container activity .

<pre><code>Bundle gameData = getIntent().getExtras();
 if (gameData != null)
 {
 int over = gameData.getInt(Constant.KEY_REQUESTED_OVER);
 ArrayList&lt;String&gt; players = gameData.getStringArrayList(Constant.KEY_PLAYERS_ARR);
 String team = gameData.getString(Constant.KEY_TEAM_NAME);

 }
 else if (gameData == null)
 {
 Toast.makeText(this, "Bundle is null", Toast.LENGTH_SHORT).show();
 }
</code></pre>

blocks|key|432212|text|接口是最好的解决方案之一：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|432213|胶水接口：|432214|public+interface+DataProviderFromActivity+{

++++public+String+getName();
++++public+String+getId);

}++|code-block|syntax|javascript|432215|MyActivity：|432216|public+class+MyActivity+implements+DataProviderFromActivity{

++++String+name+=+"Makarov";
++++String+id+=+"sys533";

++++...+...+...+...+...+....+....+
++++...+...+...+...+...+....+....+

++++public+String+getName(){
++++++++return+name;
++++};
++++public+String+getId(){
++++++++return+id;
++++};
}|432217|MyFragment：|432218|public+class+MyFragment+extends+Fragment{

++++String+fragName+=+"";
++++String+fragId+=+"";

++++...+...+...+...+...+....+....+
++++...+...+...+...+...+....+....+

++++@Override
++++public+void+onActivityCreated(Bundle+savedInstanceState)+{
++++++++super.onActivityCreated(savedInstanceState);

++++++++DataProviderFromActivity+myActivity=+(DataProviderFromActivity)+getActivity();
++++++++fragName+=+myActivity.getName();
++++++++fragId+=+myActivity.getId();

++++++++...+...+...+...+...+....+....+
++++++++...+...+...+...+...+....+....+

++++++++updateFragmentView();
++++}
}|432219|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Interface is one of the best solutions: 

Glue Interface: 

<pre><code>public interface DataProviderFromActivity {

 public String getName();
 public String getId);

} 
</code></pre>

MyActivity: 

<pre><code>public class MyActivity implements DataProviderFromActivity{

 String name = "Makarov";
 String id = "sys533";

 ... ... ... ... ... .... .... 
 ... ... ... ... ... .... .... 

 public String getName(){
 return name;
 };
 public String getId(){
 return id;
 };
}
</code></pre>

MyFragment: 

<pre><code>public class MyFragment extends Fragment{

 String fragName = "";
 String fragId = "";

 ... ... ... ... ... .... .... 
 ... ... ... ... ... .... .... 

 @Override
 public void onActivityCreated(Bundle savedInstanceState) {
 super.onActivityCreated(savedInstanceState);

 DataProviderFromActivity myActivity= (DataProviderFromActivity) getActivity();
 fragName = myActivity.getName();
 fragId = myActivity.getId();

 ... ... ... ... ... .... .... 
 ... ... ... ... ... .... .... 

 updateFragmentView();
 }
}
</code></pre>

blocks|key|432267|text|这对我很有效..|type|unstyled|depth|inlineStyleRanges|entityRanges|data|432268|在活动中添加此方法|432269|++++public+void+GetData(String+data)
+++++{
++++++++//+do+something+with+your+data++++++++
+++++}|code-block|syntax|javascript|432270|并在片段中添加以下行|432271|((YourActivity)getContext).GetData("your+data+here");|432272|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This is working for me..

in Activity add this method

<pre><code> public void GetData(String data)
 {
 // do something with your data 
 }
</code></pre>

and in Fragment add this line

<pre><code>((YourActivity)getContext).GetData("your data here");
</code></pre>

blocks|key|646637|text|public+class+Fragmentdemo+extends+Fragment+{

++public+interface+onDemoEventListener+{
++++public+void+demoEvent(String+s);
++}

++onDemoEventListener+demoEventListener;

++@Override
++public+void+onAttach(Activity+activity)+{
++++super.onAttach(activity);
++++++++try+{
++++++++++demoEventListener+=+(onDemoEventListener)+activity;
++++++++}+catch+(ClassCastException+e)+{
++++++++++++throw+new+ClassCastException(activity.toString()+%2B+"+must+implement+onDemoEventListener");
++++++++}
++}

++final+String+LOG_TAG+=+"TAG";

++public+View+onCreateView(LayoutInflater+inflater,+ViewGroup+container,
++++++Bundle+savedInstanceState)+{
++++View+v+=+inflater.inflate(R.layout.fragmentdemo,+null);

++++Button+button+=+(Button)+v.findViewById(R.id.button);
++++button.setOnClickListener(new+OnClickListener()+{
++++++public+void+onClick(View+v)+{
++++++++demoEventListener.someEvent("Test+text+to+Fragment1");
++++++}
++++});
++++enter+code+here
++++return+v;
++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|646638|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>public class Fragmentdemo extends Fragment {

 public interface onDemoEventListener {
 public void demoEvent(String s);
 }

 onDemoEventListener demoEventListener;

 @Override
 public void onAttach(Activity activity) {
 super.onAttach(activity);
 try {
 demoEventListener = (onDemoEventListener) activity;
 } catch (ClassCastException e) {
 throw new ClassCastException(activity.toString() + " must implement onDemoEventListener");
 }
 }

 final String LOG_TAG = "TAG";

 public View onCreateView(LayoutInflater inflater, ViewGroup container,
 Bundle savedInstanceState) {
 View v = inflater.inflate(R.layout.fragmentdemo, null);

 Button button = (Button) v.findViewById(R.id.button);
 button.setOnClickListener(new OnClickListener() {
 public void onClick(View v) {
 demoEventListener.someEvent("Test text to Fragment1");
 }
 });
 enter code here
 return v;
 }
}
</code></pre>

blocks|key|432348|text|我用来将数据从片段转换为活动的一个有效解决方案是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|432349|In+fragment:

Intent+intent+=+new+Intent(this,+OtherActivity.class);
Bundle+bundle+=+new+Bundle();
bundle.putString("KEY",+Value);
intent.putExtras(bundle);
getActivity().startActivity(bundle);

//------------------------------------------------------------

In+Activity+get+data:

Bundle+bundle+=+getIntent().getExtras();
if+(bundle+!=+null){
String+getData+=+bundle.getString("KEY");
}

Done!|code-block|syntax|javascript|432350|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

One effective solution I used to convert data from a fragment to an activity is:
<pre><code>In fragment:

Intent intent = new Intent(this, OtherActivity.class);
Bundle bundle = new Bundle();
bundle.putString(&quot;KEY&quot;, Value);
intent.putExtras(bundle);
getActivity().startActivity(bundle);

//------------------------------------------------------------

In Activity get data:

Bundle bundle = getIntent().getExtras();
if (bundle != null){
String getData = bundle.getString(&quot;KEY&quot;);
}

Done!
</code></pre>

blocks|key|646856|text|首先在Fragment.java中创建接口|type|unstyled|depth|inlineStyleRanges|entityRanges|data|646857|+public+interface+SendDataInterface{
+++++public+void+sendData(String+data);
+}|code-block|syntax|javascript|646858|然后通过覆盖onAttach(Context+context)方法在Fragment.java中创建活动引用|646859|@Override
public+void+onAttach(@NonNull+Context+context)+{
++++super.onAttach(context);
++++Activity+activity+=(Activity)context+;
++++try{
++++++++mSendDataInterface=+(SendDataInterface)+activity;
++++}catch(RuntimeException+e){
++++++++throw+new+RuntimeException(activity.toString()%2B"+must+implement+method");
++++}
}|646860|您的Fragment.java应该如下所示：|646861|public+class+FirstFragment+extends+Fragment+{

private+Button+mButton;
private+EditText+mEditText;
SendDataInterface+mSendDataInterface;

public+FirstFragment(){+}

/**
+*+We+can+not+directly+access+the+data+of+Fragment
+*+So+we+should+create+an+interface
+*
+*/
+public+interface+SendDataInterface{
+++++public+void+sendData(String+data);
+}


@Override
public+View+onCreateView(LayoutInflater+inflater,+ViewGroup+container,
+++++++++++++++++++++++++Bundle+savedInstanceState)+{
++++//+Inflate+the+layout+for+this+fragment
++++View+view+=++inflater.inflate(R.layout.fragment_first,+container,+false);
++++mButton+=+view.findViewById(R.id.button);
++++mEditText+=+view.findViewById(R.id.editText);

++++mButton.setOnClickListener(new+View.OnClickListener()+{
++++++++@Override
++++++++public+void+onClick(View+v)+{
++++++++++++String+data=+mEditText.getText().toString();
++++++++++++mSendDataInterface.sendData(data);
++++++++}
++++});
++++return+view;
}

/**
+*+We+create+a+reference+of+activity
+*/
@Override
public+void+onAttach(@NonNull+Context+context)+{
++++super.onAttach(context);
++++Activity+activity+=(Activity)context+;
++++try{
++++++++mSendDataInterface=+(SendDataInterface)+activity;
++++}catch(RuntimeException+e){
++++++++throw+new+RuntimeException(activity.toString()%2B"+must+implement+method");
++++}
}|646862|在MainActivity.java中实现SendDataInterface接口|646863|public+class+MainActivity+extends+AppCompatActivity+implements+FirstFragment.SendDataInterface+{

private+TextView+mTextView;

@Override
protected+void+onCreate(Bundle+savedInstanceState)+{
++++super.onCreate(savedInstanceState);
++++setContentView(R.layout.activity_main);

++++mTextView+=+findViewById(R.id.textView);

++++if(findViewById(R.id.container)+!=+null){

++++++++//+Check+if+app+is+on+Resume+in+Lifecycle
++++++++if(savedInstanceState+!=+null){
++++++++++++return;
++++++++}

++++++++FragmentManager+fragmentManager+=+getSupportFragmentManager();
++++++++fragmentManager.beginTransaction()
++++++++++++++++.add(R.id.container,new+FirstFragment(),null)
++++++++++++++++.commit();
++++}
}

@Override
public+void+sendData(String+data)+{
++++mTextView.setText(data);
}
}|646864|完成|646865|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

First create interface in your Fragment.java
<pre><code> public interface SendDataInterface{
 public void sendData(String data);
 }
</code></pre>
Then create a reference of Activity in Fragment.java by overriding onAttach(Context context) method
<pre><code>@Override
public void onAttach(@NonNull Context context) {
 super.onAttach(context);
 Activity activity =(Activity)context ;
 try{
 mSendDataInterface= (SendDataInterface) activity;
 }catch(RuntimeException e){
 throw new RuntimeException(activity.toString()+&quot; must implement method&quot;);
 }
}
</code></pre>
Your Fragment.java should look like this :
<pre><code>public class FirstFragment extends Fragment {

private Button mButton;
private EditText mEditText;
SendDataInterface mSendDataInterface;

public FirstFragment(){ }

/**
 * We can not directly access the data of Fragment
 * So we should create an interface
 *
 */
 public interface SendDataInterface{
 public void sendData(String data);
 }


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
 Bundle savedInstanceState) {
 // Inflate the layout for this fragment
 View view = inflater.inflate(R.layout.fragment_first, container, false);
 mButton = view.findViewById(R.id.button);
 mEditText = view.findViewById(R.id.editText);

 mButton.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 String data= mEditText.getText().toString();
 mSendDataInterface.sendData(data);
 }
 });
 return view;
}

/**
 * We create a reference of activity
 */
@Override
public void onAttach(@NonNull Context context) {
 super.onAttach(context);
 Activity activity =(Activity)context ;
 try{
 mSendDataInterface= (SendDataInterface) activity;
 }catch(RuntimeException e){
 throw new RuntimeException(activity.toString()+&quot; must implement method&quot;);
 }
}
</code></pre>
Implement SendDataInterface interface in your MainActivity.java
<pre><code>public class MainActivity extends AppCompatActivity implements FirstFragment.SendDataInterface {

private TextView mTextView;

@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 mTextView = findViewById(R.id.textView);

 if(findViewById(R.id.container) != null){

 // Check if app is on Resume in Lifecycle
 if(savedInstanceState != null){
 return;
 }

 FragmentManager fragmentManager = getSupportFragmentManager();
 fragmentManager.beginTransaction()
 .add(R.id.container,new FirstFragment(),null)
 .commit();
 }
}

@Override
public void sendData(String data) {
 mTextView.setText(data);
}
}
</code></pre>
Done

How can I pass data between a fragment and its container activity? Is there something similar to passing data between activities through intents?

I read this, but it didn't help much: 
<a href="http://developer.android.com/guide/topics/fundamentals/fragments.html#CommunicatingWithActivity" rel="noreferrer">http://developer.android.com/guide/topics/fundamentals/fragments.html#CommunicatingWithActivity</a>

Passing data between a fragment and its container activity

容器

如何在片段和它的容器活动之间传递数据？有没有类似于通过意图在活动之间传递数据的东西？我读了这篇文章，但没有多大帮助：

问在片段及其容器活动之间传递数据
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