更改活动时程序突然结束
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【中文标题】更改活动时程序突然结束【英文标题】：The program suddently finish when changing activity 【发布时间】：2021-12-26 13:14:39 【问题描述】：遇到切换activity时无法启动新activity的情况，模拟器自行重启程序。
这是切换前的活动
private fun login(email:String,password:String)
//Login function of customer
cAuth.signInWithEmailAndPassword(email, password)
.addOnCompleteListener(this) task ->
if (task.isSuccessful)
// Sign in success, update UI with the signed-in user's information
Toast.makeText(this,"Sucessful login", Toast.LENGTH_SHORT).show()
val intent = Intent(this, custMainMenu::class.java)
startActivity(intent)
else
// If sign in fails, display a message to the user.
Toast.makeText(this,"Wrong password or email", Toast.LENGTH_SHORT).show()
这是它的xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:id="@+id/login_layout"
android:layout_
android:layout_
tools:context=".RegisterAndLogin.CustLoginActivity"
android:background="@color/white">
<FrameLayout
android:id="@+id/custLogin_header"
android:layout_
android:layout_
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
>
<ImageView
android:layout_
android:layout_
android:contentDescription="image"
android:src="@drawable/header"
android:scaleType="fitXY"/>
</FrameLayout>
<EditText
android:layout_
android:layout_
tools:ignore="MissingConstraints"
android:layout_marginTop="35dp"
android:textSize="@dimen/title_textSize"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/custLogin_header"
android:id="@+id/titleText"
android:text="@string/cust_login_title"
android:textColor="@color/black"
>
</EditText>
<com.google.android.material.textfield.TextInputLayout
android:layout_
android:layout_
tools:ignore="MissingConstraints"
android:id="@+id/layout_et_custEmailID"
android:layout_marginStart="16dp"
android:layout_marginTop="20dp"
android:layout_marginLeft="16dp"
android:layout_marginEnd="16dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@id/titleText"
android:hint="@string/et_hint_id"
style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
android:textColorHint="@color/black"
><EditText
android:layout_
android:layout_
android:id="@+id/et_custID"
android:inputType="text"
android:padding="@dimen/et_padding"
android:textColor="@color/black"
android:textSize="@dimen/et_textSize"
></EditText>
</com.google.android.material.textfield.TextInputLayout>
<com.google.android.material.textfield.TextInputLayout
android:layout_
android:layout_
tools:ignore="MissingConstraints"
android:id="@+id/layout_et_custPassword"
android:layout_marginStart="16dp"
android:layout_marginTop="20dp"
android:layout_marginLeft="16dp"
android:layout_marginEnd="16dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@id/layout_et_custEmailID"
android:hint="@string/et_hint_password"
style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
android:textColorHint="@color/black"
><EditText
android:layout_
android:layout_
android:id="@+id/et_custPassword"
android:inputType="textPassword"
android:padding="@dimen/et_padding"
android:textColor="@color/black"
android:textSize="@dimen/et_textSize"
></EditText>
</com.google.android.material.textfield.TextInputLayout>
<EditText
android:id="@+id/tv_forgotPassword"
android:layout_
android:layout_
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:padding="@dimen/clickable_text_padding"
android:text="@string/forgot_pass"
android:textColor="@color/black"
android:textSize="@dimen/forgot_password"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@id/layout_et_custPassword"
tools:ignore="MissingConstraints" />
<com.example.finalyearproject.util.NDIButton
android:id="@+id/custLogin_btn"
android:layout_
android:layout_
android:layout_marginTop="67dp"
android:text="@string/btn_login_text"
app:layout_constraintTop_toBottomOf="@+id/layout_et_custPassword"
tools:layout_editor_absoluteX="158dp"
android:background="@drawable/button_background"
android:gravity="center"
tools:ignore="MissingConstraints" />
<com.example.finalyearproject.util.NDITextViewItalic
android:id="@+id/tv_custRegister"
android:layout_
android:layout_
android:layout_marginTop="7dp"
android:foreground="?attr/selectableItemBackground"
android:padding="@dimen/clickable_text_padding"
android:text="Do not have account?Register"
android:textColor="@color/black"
android:textSize="@dimen/lbl_textSize"
app:layout_constraintTop_toBottomOf="@+id/custLogin_btn"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
tools:ignore="MissingConstraints"
tools:layout_editor_absoluteX="109dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
这是切换后的activity
class custMainMenu : AppCompatActivity()
private lateinit var bottomMenu:BottomNavigationView
private lateinit var chatButton: Button
override fun onCreate(savedInstanceState: Bundle?)
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_cust_main_menu)
bottomMenu = findViewById(R.id.bottomMenu)
chatButton=findViewById(R.id.chatButton)
val navigationController = findNavController(R.id.navigate1)
bottomMenu.setupWithNavController(navigationController)
chatButton.setOnClickListener()
val intent= Intent(this,CustMainActivity::class.java)
startActivity(intent)
这是第二个活动的 xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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_
android:layout_
tools:context=".custMainMenu"
>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/productRView"
android:layout_
android:layout_
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toTopOf="@+id/bottomMenu"
tools:listitem="@layout/product_item_layout" />
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bottomMenu"
android:layout_
android:layout_
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:menu="@menu/menu1"
app:layout_constraintBottom_toBottomOf="parent" />
<ImageView
android:id="@+id/chatButton"
android:layout_
android:layout_
android:layout_marginBottom="36dp"
app:layout_constraintBottom_toTopOf="@+id/bottomMenu"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.909"
app:layout_constraintStart_toStartOf="parent"
android:src="@drawable/ic_baseline_chat_24"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
我尝试了其他活动和片段，它成功运行，我相信问题出在第二个 xml 文件中，但为了参考，我将两者都发布了。请尽快帮助我，需要及时使用。
这是日志猫
2021-11-15 19:16:12.868 30586-30586/com.example.finalyearproject D/AndroidRuntime: Shutting down VM
2021-11-15 19:16:12.870 30586-30586/com.example.finalyearproject E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.finalyearproject, PID: 30586
java.lang.RuntimeException: Unable to start activity ComponentInfocom.example.finalyearproject/com.example.finalyearproject.custMainMenu: java.lang.ClassCastException: androidx.appcompat.widget.AppCompatImageView cannot be cast to android.widget.Button
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3449)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
Caused by: java.lang.ClassCastException: androidx.appcompat.widget.AppCompatImageView cannot be cast to android.widget.Button
at com.example.finalyearproject.custMainMenu.onCreate(custMainMenu.kt:19)
at android.app.Activity.performCreate(Activity.java:8000)
at android.app.Activity.performCreate(Activity.java:7984)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3422)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
【问题讨论】：
请同时分享崩溃日志 这能回答你的问题吗？ Unfortunately MyApp has stopped. How can I solve this? 请将 Logcat 详细信息连同您的问题一起发布 【参考方案1】：你有 id 为 chatButton 的 imageView。
<ImageView
android:id="@+id/chatButton"..
但您将其声明为 Button
private lateinit var chatButton: Button
当然应该是ImageView
【讨论】：
是的，这是一个问题，但问题不是主要问题。项目还是不行 这是基于您的日志的问题。如果您有其他问题，则不会显示在此日志中；此修复解决了您在此处显示的错误投射问题。以上是关于更改活动时程序突然结束的主要内容，如果未能解决你的问题，请参考以下文章