将一个函数从Java转换为Kotlin（Android）。

huangapple
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英文:

Convert one function from java to kotlin android

问题

Converted Function In Kotlin :

  1. fun firebaseAuth(auth: FirebaseAuth, authCredential: AuthCredential?,
  2.     delegate: Function<Any?, Void?>
  3. ) {
  4.     auth.signInWithCredential(authCredential!!)
  5.         .addOnCompleteListener { task: Task<AuthResult?> ->
  6.             if (task.isSuccessful) {
  7.                 delegate.apply(auth.currentUser)
  8.             } else {
  9.                 delegate.apply(task.exception)
  10.             }
  11.         }
  12. }

Use Converted function in Kotlin:

我想要知道这个答案。因为我已经尝试过在Android Studio中进行转换，但编译器没有正确地进行转换。所以我想知道如何在Kotlin中使用这个函数。

提前感谢您。

英文:

I have developed one app in JAVA. Now I have made one function for firebase related calls. and Working perfectly. But now I want to convert that function to kotlin also. But I was confused about how to use that function call in kotlin.

Function of Java :

  1. public static void firebaseAuth(FirebaseAuth auth, AuthCredential authCredential, Function&lt;Object, Void&gt; delegate) {
  2.     auth.signInWithCredential(authCredential).addOnCompleteListener(task -&gt; {
  3.         if (task.isSuccessful()) {
  4.             delegate.apply(auth.getCurrentUser());
  5.         } else {
  6.             delegate.apply(task.getException());
  7.         }
  8.     });
  9. }

Use of this Function in Java :

  1. FireSignInHelper.firebaseAuth(mFireAuth, authCredential, o -&gt; {
  3.             if (o instanceof Exception) {
  4.                 signIn_UnSuccessful((Exception) o);
  5.             } else if (o instanceof FirebaseUser) {
  6.                 FirePacket firePacket = new FirePacket();
  7.                 firePacket.setProvider(provider);
  8.                 firePacket.setToken(((FirebaseUser) o).getUid());
  9.                 firePacket.setFirebaseUser((FirebaseUser) o);
  10.                 signIn_Successful(firePacket);
  11.             }
  12.             return null;
  13.         });

Converted Function In Kotlin :

  1. fun firebaseAuth(auth: FirebaseAuth,
  2.     authCredential: AuthCredential?,
  3.     delegate: Function&lt;Any?, Void?&gt;
  4. ) {
  5.     auth.signInWithCredential(authCredential!!)
  6.         .addOnCompleteListener { task: Task&lt;AuthResult?&gt; -&gt;
  7.             if (task.isSuccessful) {
  8.                 delegate.apply(auth.currentUser)
  9.             } else {
  10.                 delegate.apply(task.exception)
  11.             }
  12.         }
  13. }

Use Converted function in kotlin:

I want to know this answer. Because I have try through Android studio but the compiler didn't convert properly. So I want to know how to use this function in kotlin.

Thanks In advance.

答案1

得分: 2

以下是翻译好的内容：

The way IntelliJ convert your code is correct.
However the Function interface is of no use in kotlin since functions are first-class citizens. See higher-Order Functions examples from the doc.

I think you simply want to do something like this

  1. fun firebaseAuth(
  2.     auth: FirebaseAuth,
  3.     authCredential: AuthCredential?,
  4.     listener: (Any) -> Unit
  5. ) {
  6.     auth.signInWithCredential(authCredential!!)
  7.         .addOnCompleteListener {
  8.             listener.invoke(
  9.                 if (it.isSuccessful) auth.currentUser 
  10.                 else it.exception
  11.             )                
  12.         }
  13. }

And then

  1. FireSignInHelper.firebaseAuth(mFireAuth, authCredential) { 
  2.      when(it){
  3.         is FirebaseUser -> { ... }
  4.         is Exception -> { ... }
  5.      }
  6. }
英文:

The way IntelliJ convert your code is correct.
However the Function interface is of no use in kotlin since functions are first-class citizens. See higher-Order Functions examples from the doc.

I think you simply want to do something like this

  1. fun firebaseAuth(
  2.     auth: FirebaseAuth,
  3.     authCredential: AuthCredential?,
  4.     listener: (Any) -&gt; Unit
  5. ) {
  6.     auth.signInWithCredential(authCredential!!)
  7.         .addOnCompleteListener {
  8.             listener.invoke(
  9.                 if (it.isSuccessful) auth.currentUser 
  10.                 else it.exception
  11.             )                
  12.         }
  13. }

And then

  1. FireSignInHelper.firebaseAuth(mFireAuth, authCredential) { 
  2.      when(it){
  3.         is FirebaseUser -&gt; { ... }
  4.         is Exception -&gt; { ... }
  5.      }
  6. }

huangapple
  • 本文由 发表于 2020年4月6日 02:35:47
  • 转载请务必保留本文链接：https://go.coder-hub.com/61047582.html
  • android
  • java
  • kotlin
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