onclick在android studio中不使用kotlin响应

我是kotlin的新手。 在这里，我正在实现登录屏幕到我的应用程序，并执行类使用kotlin下面的XML文件，但是当我点击按钮或textview onclick没有响应。 请帮我解决这个问题。

import android.content.Intent import android.support.v7.app.AppCompatActivity import android.os.* import android.util.Log import android.view.View import android.widget.Button import android.widget.TextView import android.widget.Toast import butterknife.BindView import butterknife.ButterKnife import butterknife.OnClick class login : AppCompatActivity(), View.OnClickListener { @BindView(R.id.title) var title: TextView? = null @BindView (R.id.email) var email : TextView? = null @BindView (R.id.password) var pass : TextView? = null @BindView (R.id.tv_fp) var fp : TextView? = null @BindView (R.id.tv_register) var register : TextView? = null @BindView (R.id.btn_login ) var login : Button? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_login) ButterKnife.bind(this) // change to register!!.setOnClickListener(this) to make sure your view is injected register?.setOnClickListener(this) login?.setOnClickListener(this) } // v--- change the parameter type View? to View, it is never be null override fun onClick(p0: View?) { // v--- remove it TODO("not implemented") //To change body of created functions use File | Settings | File Templates. // v--- remove the redundant safe-call ?. if(p0?.id == R.id.tv_register){ Log.e("login", "i") var intent = Intent(this@login, signin:: class.java) startActivity(intent) } if(p0?.id == R.id.btn_login){ Toast.makeText(this, "Login Button clicked", Toast.LENGTH_SHORT) } } } 

和这个类的布局文件如下，我使用了constrainedLayout

 <?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_margin="20dp"> <android.support.design.widget.TextInputEditText android:id="@+id/email" android:layout_width="0dp" android:layout_height="wrap_content" android:hint="Email id" android:textCursorDrawable="@drawable/cursor_color" android:backgroundTint="@color/skyBlue" app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent" android:layout_marginTop="100dp" app:layout_constraintHorizontal_bias="0.0" android:inputType="textEmailAddress"/> <android.support.design.widget.TextInputEditText android:layout_width="0dp" android:layout_height="wrap_content" android:hint="Password" android:textCursorDrawable="@drawable/cursor_color" android:id="@+id/password" app:layout_constraintStart_toStartOf="parent" android:layout_marginTop="8dp" app:layout_constraintTop_toBottomOf="@+id/email" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.0" android:inputType="textPassword"/> <Button android:id="@+id/btn_login" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Login" app:layout_constraintStart_toStartOf="parent" android:layout_marginTop="36dp" android:background="@color/yellow" android:textStyle="bold" app:layout_constraintTop_toBottomOf="@+id/password" android:layout_marginStart="4dp" /> <TextView android:id="@+id/tv_fp" android:layout_width="171dp" android:layout_height="22dp" android:text="FORGOT PASSWORD?" android:background="?attr/selectableItemBackground" tools:layout_editor_absoluteY="301dp" android:layout_marginStart="8dp" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="@+id/tv_register" android:layout_marginTop="6dp" android:layout_marginBottom="7dp" app:layout_constraintBottom_toTopOf="@+id/btn_login" /> <TextView android:id="@+id/tv_register" android:layout_width="156dp" android:layout_height="18dp" android:layout_marginStart="8dp" android:text="Register" android:background="?attr/selectableItemBackground" android:gravity="right" app:layout_constraintStart_toEndOf="@+id/tv_fp" app:layout_constraintTop_toTopOf="@+id/button" android:layout_marginTop="58dp" app:layout_constraintBottom_toBottomOf="@+id/btn_login" /> </android.support.constraint.ConstraintLayout>