Imagebutton在slideuppanel中不起作用

Question

我正在使用umano SlidingUpPanel库，并且在面板中使用了imagebutton，但是当我单击imagebutton时什么也没有发生，我在另一个运行良好的活动中尝试了imagebutton。当按下按钮时，“下一个”应该被打印到日志中。我到处搜索，但找不到任何解决方法

这是我的代码：

@SuppressLint("Registered")
public class NowPlaying extends Activity {

ImageButton play, pause, play_main, pause_main, next, imgbtn;

private MusicService musicSrv;


@SuppressLint("WrongViewCast")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.now_playing);

    play = findViewById(R.id.play_button);

    imgbtn = findViewById(R.id.imgbtn);
    imgbtn.setOnClickListener(new View.OnClickListener() {
        @SuppressLint("ShowToast")
        @Override
        public void onClick(View v) {
            Log.i("oladapos", "next");
        }
    });

    SlidingUpPanelLayout now_playing = 
findViewById(R.id.slideup_nowplaying);

    next.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            playNext();
        }
    });


}

//play next
private void playNext(){
    musicSrv.playNext();
}

//play previous
private void playPrev(){
    musicSrv.playPrev();
}

@Override
public void start() {

}

@Override
public void pause() {

}

@Override
public int getDuration() {
    return 0;
}

@Override
public int getCurrentPosition() {
    return 0;
}

@Override
public void seekTo(int pos) {

}

@Override
public boolean isPlaying() {
    return false;
}

@Override
public int getBufferPercentage() {
    return 0;
}

@Override
public boolean canPause() {
    return false;
}

@Override
public boolean canSeekBackward() {
    return false;
}

@Override
public boolean canSeekForward() {
    return false;
}

@Override
public int getAudioSessionId() {
    return 0;
}
}

xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/slideup_nowplaying"
android:layout_height="match_parent"
android:layout_width="match_parent"
tools:context=".Fragments.songsFragment">

<ImageView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_centerInParent="true"
    android:layout_alignParentTop="true"
    android:scaleType="centerCrop"
    android:src="@drawable/songs_cover"
    tools:ignore="ContentDescription" />

<LinearLayout
    android:id="@+id/toolbar_layout"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:clickable="true"
    android:orientation="horizontal"
    android:focusable="true">

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <ImageView
            android:id="@+id/songs_cover_one"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:layout_margin="10dp"
            android:layout_marginTop="8dp"
            android:layout_marginBottom="8dp"
            android:src="@drawable/songs_cover"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            tools:ignore="ContentDescription" />

        <LinearLayout
            android:id="@+id/linearLayout"
            android:layout_width="202dp"
            android:layout_height="match_parent"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="8dp"
            android:layout_marginBottom="8dp"
            android:orientation="vertical"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/linearLayout3"
            app:layout_constraintStart_toEndOf="@+id/songs_cover_one"
            app:layout_constraintTop_toTopOf="parent">

            <TextView
                android:id="@+id/songs_title"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fontFamily="sans-serif-condensed"
                android:lines="1"
                android:text="@string/havana_camila_cabello_song"
                android:textColor="#FFFFFF"
                android:textSize="22sp" />

            <TextView
                android:id="@+id/songs_artist_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:lines="1"
                android:text="@string/camila_cabello" />

        </LinearLayout>

        <LinearLayout
            android:id="@+id/linearLayout3"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="8dp"
            android:layout_marginBottom="8dp"
            android:gravity="center"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.974"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:orientation="horizontal">

            <Button
                android:id="@+id/play_button"
                android:layout_width="50dp"
                android:layout_height="50dp"
                android:clickable="true"
                android:focusable="true"
                android:scaleType="centerInside"
                android:src="@drawable/round_play_arrow_black_48dp" />

        </LinearLayout>

    </android.support.constraint.ConstraintLayout>

</LinearLayout>

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageButton
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/forword_button"
        android:id="@+id/imgbtn"/>

</RelativeLayout>
</RelativeLayout>