java - 未找到包含字段 id 的所需 View ，但 id 存在

Question

我有一个小问题。

我正在尝试使用 ID ongoing_call_layout 进行 BindView。我有那个 id，它存在并且它是 xml 中的 ConstraintLayout 对象。运行程序时，它的行为就像 id“ongoing_call_layout”不存在一样。

我尝试清理和重建项目，并使用 findViewById 而不是 BindView，但它仍然表示该 id 不存在。

代码本身以粗体显示(AndroidStudio 知道 id 在哪里)。

下面是相关代码

这是我的OngoingCallActivity.java(错误来自哪里):

@BindView(R.id.ongoing_call_layout) ConstraintLayout mOngoingCallLayout;
.
.
.
 ButterKnife.bind(this);
.
.

错误:

Unable to start activity ComponentInfo{com.chooloo.www.callmanager/com.chooloo.www.callmanager.ui.activity.OngoingCallActivity}: java.lang.IllegalStateException: Required view 'ongoing_call_layout' with ID 2131362055 for field 'mOngoingCallLayout' was not found. If this view is optional add '@Nullable' (fields) or '@Optional' (methods) annotation.

这是我的on_going_call.xml(ID 的来源):

<?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/ongoing_call_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layoutDirection="ltr"
    tools:context=".ui.activity.OngoingCallActivity">

    <!-- Call Timer -->
    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guide_status_bar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_begin="24dp" />

    <TextView
        android:id="@+id/text_stopwatch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/guide_status_bar"
        tools:text="00:00" />

    <!-- Caller Number (Temporary) -->

    <!-- Caller Pic -->

    <FrameLayout
        android:id="@+id/frameLayout"
        android:layout_width="129dp"
        android:layout_height="135dp"
        app:layout_constraintBottom_toTopOf="@+id/text_caller"
        app:layout_constraintEnd_toEndOf="@+id/text_caller"
        app:layout_constraintStart_toStartOf="@+id/text_caller"
        app:layout_constraintTop_toBottomOf="@+id/text_stopwatch">

        <ImageView
            android:id="@+id/image_placeholder"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:tint="@color/selector_button_icon"
            app:srcCompat="@drawable/ic_account_circle_black_24dp" />

        <de.hdodenhof.circleimageview.CircleImageView
            android:id="@+id/image_photo"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:visibility="gone"
            app:civ_border_width="0dp" />

    </FrameLayout>

    <!-- Caller Name -->
    <TextView
        android:id="@+id/text_caller"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingLeft="10sp"
        android:paddingRight="10sp"
        android:textAlignment="center"
        android:textAppearance="@style/TextAppearance.MaterialComponents.Headline4"
        android:textColor="?attr/iconColor"
        android:textStyle="bold"
        app:layout_constraintBottom_toTopOf="@+id/text_status"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        tools:text="Jesus" />

    <!-- Call Status -->
    <TextView
        android:id="@+id/text_status"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="24dp"
        android:textAppearance="@style/TextAppearance.MaterialComponents.Subtitle1"
        android:textColor="?attr/colorAccent"
        app:layout_constraintBottom_toTopOf="@+id/guide_eye_level"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="@+id/text_caller"
        tools:text="@string/status_call_incoming" />

    <!-- Hold Button -->
    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guide_eye_level"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.44" />

    <ImageView
        android:id="@+id/button_hold"
        android:layout_width="@dimen/flat_button_size"
        android:layout_height="62dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="120dp"
        android:layout_marginEnd="16dp"
        android:layout_weight="1"
        android:background="@drawable/ripple_oval"
        android:clickable="true"
        android:focusable="true"
        android:padding="@dimen/flat_button_padding"
        android:tint="@color/selector_button_icon"
        android:visibility="invisible"
        app:layout_constraintBottom_toTopOf="@+id/button_add_call"
        app:layout_constraintEnd_toStartOf="@+id/button_speaker"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/button_mute"
        app:layout_constraintTop_toTopOf="@+id/guide_eye_level"
        app:layout_constraintVertical_bias="0.32999998"
        app:layout_constraintVertical_chainStyle="packed"
        app:srcCompat="@drawable/ic_pause_black_24dp"
        tools:visibility="visible" />

    <!-- Mute Button -->
    <ImageView
        android:id="@+id/button_mute"
        android:layout_width="@dimen/flat_button_size"
        android:layout_height="@dimen/flat_button_size"
        android:layout_marginEnd="16dp"
        android:layout_weight="1"
        android:background="@drawable/ripple_oval"
        android:clickable="true"
        android:focusable="true"
        android:padding="@dimen/flat_button_padding"
        android:tint="@color/selector_button_icon"
        android:visibility="invisible"
        app:layout_constraintBottom_toBottomOf="@+id/button_hold"
        app:layout_constraintEnd_toStartOf="@+id/button_hold"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/button_hold"
        app:srcCompat="@drawable/ic_mic_off_black_24dp"
        tools:visibility="visible" />

    <!-- Speaker Button -->
    <ImageView
        android:id="@+id/button_speaker"
        android:layout_width="@dimen/flat_button_size"
        android:layout_height="@dimen/flat_button_size"
        android:layout_marginStart="16dp"
        android:layout_weight="1"
        android:background="@drawable/ripple_oval"
        android:clickable="true"
        android:focusable="true"
        android:padding="@dimen/flat_button_padding"
        android:tint="@color/selector_button_icon"
        android:visibility="invisible"
        app:layout_constraintBottom_toBottomOf="@+id/button_hold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/button_hold"
        app:layout_constraintTop_toTopOf="@+id/button_hold"
        app:srcCompat="@drawable/ic_volume_up_black_24dp"
        tools:visibility="visible" />

    <!-- Keypad Button -->
    <ImageView
        android:id="@+id/button_keypad"
        android:layout_width="@dimen/flat_button_size"
        android:layout_height="@dimen/flat_button_size"
        android:layout_marginEnd="16dp"
        android:layout_weight="1"
        android:background="@drawable/ripple_oval"
        android:clickable="true"
        android:focusable="true"
        android:padding="@dimen/flat_button_padding"
        android:tint="@color/selector_button_icon"
        android:visibility="invisible"
        app:layout_constraintBottom_toBottomOf="@+id/button_add_call"
        app:layout_constraintEnd_toStartOf="@+id/button_add_call"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/button_add_call"
        app:srcCompat="@drawable/ic_dialpad_black_24dp"
        tools:visibility="visible" />

    <!-- Add Call Button -->
    <ImageView
        android:id="@+id/button_add_call"
        android:layout_width="65dp"
        android:layout_height="67dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="32dp"
        android:background="@drawable/ripple_oval"
        android:clickable="true"
        android:focusable="true"
        android:padding="@dimen/flat_button_padding"
        android:tint="@color/selector_button_icon"
        android:visibility="invisible"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/button_keypad"
        app:layout_constraintTop_toBottomOf="@+id/button_hold"
        app:srcCompat="@drawable/ic_add_black_24dp"
        tools:visibility="visible" />

    <!-- Answer Button -->
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/answer_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginBottom="32dp"
        android:scaleType="center"
        android:src="@drawable/ic_call_black_24dp"
        android:tint="@color/green_phone"
        app:backgroundTint="@color/white"
        app:fabCustomSize="72dp"
        app:fabSize="normal"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:maxImageSize="36dp" />

    <!-- Reject Button -->
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/reject_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="32dp"
        android:layout_marginBottom="32dp"
        android:scaleType="center"
        android:src="@drawable/ic_call_end_black_24dp"
        android:tint="@color/red_phone"
        app:backgroundTint="@color/white"
        app:fabCustomSize="72dp"
        app:fabSize="normal"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:maxImageSize="36dp" />

    <!-- Guidelines -->

</androidx.constraintlayout.widget.ConstraintLayout>

我无法声明 mOngoingCallLayout Nullable 因为它是必要的。顺便说一句，这个错误是在我从服务器合并一些代码后突然开始发生的，但与此相关的所有代码仍然是相同的。谢谢您的帮助

Answer 1

您可以尝试几种方法

1. 重建项目
2. 清洁项目
3. 使缓存无效/重新启动

您还可以尝试 ButterKnife Plugin = 设置 -> 插件 -> Android ButterKnife Zelezny;

要访问插件菜单，请将键盘光标放在 setContentView(R.layout.your_activity) 中的 Activity 名称上，然后按 ALT + INSERT 它将是最后一个或第二个最后一个选项生成 ButterKnife 注入(inject)

希望这会有所帮助