blocks|key|1315070|text|创建监听器接口。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1315071|public+interface+YourCustomListener
{
++++public+void+onCustomClick(View+view);
++++++++++++//+pass+view+as+argument+or+whatever+you+want.
}|code-block|syntax|javascript|1315072|并在另一个活动(或片段)中创建方法setOnCustomClick，您想要在其中应用您的自定义侦听器......|1315073|++public+void+setCustomClickListener(YourCustomListener+yourCustomListener)
{
++++this.yourCustomListener=+yourCustomListener;
}|1315074|在您的第一个活动中调用此方法，并传递侦听器接口...|1315075|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Create listener interface.

<pre><code>public interface YourCustomListener
{
 public void onCustomClick(View view);
 // pass view as argument or whatever you want.
}
</code></pre>

And create method setOnCustomClick in another activity(or fragment) , where you want to apply your custom listener......

<pre><code> public void setCustomClickListener(YourCustomListener yourCustomListener)
{
 this.yourCustomListener= yourCustomListener;
}
</code></pre>

Call this method from your First activity, and pass the listener interface...

blocks|key|1315153|text|请务必阅读observer+pattern|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1315154|监听器接口|1315155|public+interface+OnEventListener+{
++++void+onEvent(EventResult+er);
++++//+or+void+onEvent();+as+per+your+need
}|code-block|syntax|javascript|1315156|然后在你的类中说Event类|style|CODE|1315157|public+class+Event+{
++++private+OnEventListener+mOnEventListener;

++++public+void+setOnEventListener(OnEventListener+listener)+{
++++++++mOnEventListener+=+listener;
++++}

++++public+void+doEvent()+{
++++++++/*
+++++++++*+code+code+code
+++++++++*/

+++++++++//+and+in+the+end

+++++++++if+(mOnEventListener+!=+null)
+++++++++++++mOnEventListener.onEvent(eventResult);+//+event+result+object+:)
++++}
}|1315158|在您的驱动程序类MyTestDriver中|1315159|public+class+MyTestDriver+{
++++public+static+void+main(String[]+args)+{
++++++++Event+e+=+new+Event();
++++++++e.setOnEventListener(new+OnEventListener()+{
+++++++++++++public+void+onEvent(EventResult+er)+{
+++++++++++++++++//+do+your+work.+
+++++++++++++}
++++++++});
++++++++e.doEvent();
++++}
}|1315160|entityMap|0|LINK|mutability|MUTABLE|url|http://www.vogella.com/articles/DesignPatternObserver/article.html^0|5|G|0|0|0|0|8|5|0|0|8|C|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|D|3|E|5|6|7|16|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|17|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|18|8|@$A|19|B|1A|M|N]]|9|@]|C|$]]|$1|O|3|P|5|H|7|1B|8|@]|9|@]|C|$I|J]]|$1|Q|3|R|5|6|7|1C|8|@$A|1D|B|1E|M|N]]|9|@]|C|$]]|$1|S|3|T|5|H|7|1F|8|@]|9|@]|C|$I|J]]|$1|U|3|-4|5|6|7|1G|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]]]

please do read <a href="http://www.vogella.com/articles/DesignPatternObserver/article.html" rel="noreferrer">observer pattern</a>

listener interface

<pre><code>public interface OnEventListener {
 void onEvent(EventResult er);
 // or void onEvent(); as per your need
}
</code></pre>

then in your class say <code>Event</code> class

<pre><code>public class Event {
 private OnEventListener mOnEventListener;

 public void setOnEventListener(OnEventListener listener) {
 mOnEventListener = listener;
 }

 public void doEvent() {
 /*
 * code code code
 */

 // and in the end

 if (mOnEventListener != null)
 mOnEventListener.onEvent(eventResult); // event result object :)
 }
}
</code></pre>

in your driver class <code>MyTestDriver</code>

<pre><code>public class MyTestDriver {
 public static void main(String[] args) {
 Event e = new Event();
 e.setOnEventListener(new OnEventListener() {
 public void onEvent(EventResult er) {
 // do your work. 
 }
 });
 e.doEvent();
 }
}
</code></pre>

blocks|key|1315264|text|在Android中，你可以创建一个接口，比如Listener，然后你的Activity就会实现它，但我不认为这是一个好主意。如果我们有许多组件来监听它们状态的变化，我们可以创建一个BaseListener实现的接口监听器，并使用类型代码来处理它们。我们可以在创建XML文件时绑定方法，例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1315265|<Button++
++++++++android:id="@%2Bid/button4"++
++++++++android:layout_width="match_parent"++
++++++++android:layout_height="wrap_content"++
++++++++android:text="Button4"++
++++++++android:onClick="Btn4OnClick"+/>|code-block|syntax|javascript|1315266|和源代码：|1315267|+public+void+Btn4OnClick(View+view)+{++
++++++++String+strTmp+=+"点击Button04";++
++++++++tv.setText(strTmp);++
++++}++|1315268|但我不认为这是个好主意。|1315269|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

In Android,you can create an interface such as Listener,and your Activity implements it,but i don't think it is a good idea.
if we have many components to listen the changes of their state,we can create a BaseListener implements interface Listener,and use type code to handle them.
we can bind the method when we create XML file,for example:

<pre><code>&lt;Button 
 android:id="@+id/button4" 
 android:layout_width="match_parent" 
 android:layout_height="wrap_content" 
 android:text="Button4" 
 android:onClick="Btn4OnClick" /&gt;
</code></pre>

and the source code:

<pre><code> public void Btn4OnClick(View view) { 
 String strTmp = "点击Button04"; 
 tv.setText(strTmp); 
 } 
</code></pre>

but i don't think it is a good idea...

blocks|key|1315366|text|在2018年，不再需要监听器接口。您已经让Android+LiveData负责将所需的结果传递回UI组件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1315367|如果我采用Rupesh的答案并将其调整为使用LiveData，它将如下所示：|1315368|public+class+Event+{

++++public+LiveData<EventResult>+doEvent()+{
+++++++++/*
++++++++++*+code+code+code
++++++++++*/

+++++++++//+and+in+the+end

+++++++++LiveData<EventResult>+result+=+new+MutableLiveData<>();
+++++++++result.setValue(eventResult);
+++++++++return+result;
++++}
}|code-block|syntax|javascript|1315369|现在在您的驱动程序类MyTestDriver中：|1315370|public+class+MyTestDriver+{
++++public+static+void+main(String[]+args)+{
++++++++Event+e+=+new+Event();
++++++++e.doEvent().observe(this,+new++Observer<EventResult>()+{
++++++++++++@Override
++++++++++++public+void+onChanged(final+EventResult+er)+{
++++++++++++++++//+do+your+work.
++++++++++++}
++++++++});
++++}
}|1315371|有关代码示例的更多信息，您可以阅读我关于它的帖子以及官方文档：|1315372|When+and+why+to+use+LiveData|offset|length|1315373|Official+docs|1315374|entityMap|0|LINK|mutability|MUTABLE|url|https://medium.com/sears-israel/when-and-why-to-use-android-livedata-93d7dd949138|1|https://developer.android.com/topic/libraries/architecture/^0|0|0|0|0|0|0|0|S|0|0|0|D|1|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|15|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|17|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|18|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|19|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1A|8|@]|9|@$Q|1B|R|1C|1|1D]]|A|$]]|$1|S|3|T|5|6|7|1E|8|@]|9|@$Q|1F|R|1G|1|1H]]|A|$]]|$1|U|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]|12|$5|X|Y|Z|A|$10|13]]]]

In the year of 2018, there's no need for listeners interfaces. You've got Android LiveData to take care of passing the desired result back to the UI components.

If I'll take Rupesh's answer and adjust it to use LiveData, it will like so:

<pre><code>public class Event {

 public LiveData&lt;EventResult&gt; doEvent() {
 /*
 * code code code
 */

 // and in the end

 LiveData&lt;EventResult&gt; result = new MutableLiveData&lt;&gt;();
 result.setValue(eventResult);
 return result;
 }
}
</code></pre>

and now in your driver class MyTestDriver:

<pre><code>public class MyTestDriver {
 public static void main(String[] args) {
 Event e = new Event();
 e.doEvent().observe(this, new Observer&lt;EventResult&gt;() {
 @Override
 public void onChanged(final EventResult er) {
 // do your work.
 }
 });
 }
}
</code></pre>

For more information along with code samples you can read my post about it, as well as the offical docs:

<a href="https://medium.com/sears-israel/when-and-why-to-use-android-livedata-93d7dd949138" rel="nofollow noreferrer">When and why to use LiveData</a>

<a href="https://developer.android.com/topic/libraries/architecture/" rel="nofollow noreferrer">Official docs</a>

blocks|key|1315490|text|我已经做了类似下面的事情，将我的模型类从第二个活动发送到第一个活动。在Rupesh和TheCodeFather的回答的帮助下，我使用LiveData实现了这一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1315491|第二项活动|1315492|public+static+MutableLiveData<AudioListModel>+getLiveSong()+{
++++++++MutableLiveData<AudioListModel>+result+=+new+MutableLiveData<>();
++++++++result.setValue(liveSong);
++++++++return+result;
++++}|code-block|syntax|javascript|1315493|"liveSong“是全局声明的AudioListModel|1315494|在第一个活动中调用此方法|1315495|PlayerActivity.getLiveSong().observe(this,+new+Observer<AudioListModel>()+{
++++++++++++@Override
++++++++++++public+void+onChanged(AudioListModel+audioListModel)+{
++++++++++++++++if+(PlayerActivity.mediaPlayer+!=+null+&&+PlayerActivity.mediaPlayer.isPlaying())+{
++++++++++++++++++++Log.d("LiveSong--->Changes-->",+audioListModel.getSongName());
++++++++++++++++}
++++++++++++}
++++++++});|1315496|希望这对像我这样的新探险家有所帮助。|1315497|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]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|X|8|@]|9|@]|A|$G|H]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

I have done it something like below for sending my model class from the Second Activity to First Activity. I used LiveData to achieve this, with the help of answers from Rupesh and TheCodeFather.

Second Activity

<pre><code>public static MutableLiveData&lt;AudioListModel&gt; getLiveSong() {
 MutableLiveData&lt;AudioListModel&gt; result = new MutableLiveData&lt;&gt;();
 result.setValue(liveSong);
 return result;
 }
</code></pre>

"liveSong" is AudioListModel declared globally

Call this method in the First Activity

<pre><code>PlayerActivity.getLiveSong().observe(this, new Observer&lt;AudioListModel&gt;() {
 @Override
 public void onChanged(AudioListModel audioListModel) {
 if (PlayerActivity.mediaPlayer != null &amp;&amp; PlayerActivity.mediaPlayer.isPlaying()) {
 Log.d("LiveSong---&gt;Changes--&gt;", audioListModel.getSongName());
 }
 }
 });
</code></pre>

May this help for new explorers like me.

Could someone help me to create user defined listener interface with some code snippets?

How to create our own Listener interface in android?

Android

有没有人可以帮我用一些代码片段创建用户定义的监听器接口？

问如何在android中创建我们自己的Listener界面？
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