Required view with id for field was not found but id exists

Question

I have a little problem.

I'm trying to BindView with the id ongoing_call_layout. I have that id, it exists and its a ConstraintLayout object in xml. When running the program it acts like the id "ongoing_call_layout" doesn't exist.

I've tried cleaning and rebuilding the project and also using findViewById instead of BindView but still, it says that the id doesn't exist.

In the code itself its bolded (AndroidStudio do know where the id is).

Below is the related code

Here is my OngoingCallActivity.java (where the error comes from):

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

The error:

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.

Here is my on_going_call.xml (where the id comes from):

<?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>

I cant make the declaration of mOngoingCallLayout Nullable because its necessary. By the way, that bug only started happening out of no where after i merged some code from server but all the code that's related to this is still the same. Thank you for your help

Answer 1

You can try several things

1. Rebuild project
2. Clean project
3. Invalidate Caches/ Restart

You can also try ButterKnife Plugin = Settings -> Plugins -> Android ButterKnife Zelezny;

To access plugin menu, place your keyboard cursor on the activity name in setContentView(R.layout.your_activity) and press ALT + INSERT it will be last or second last option Generate ButterKnife Injections

Hope this will help