I have a fragment containing a recyclerView.
When an item is clicked on in the recyclerView I set the recyclerview item background to green and change the “saveBtn” text to “Update”.
I need to also be able to remove the “deletebtn” every time a user clicks on a recyclerView item, or hide it so that the UI looks somewhat like this:
How could this be done?
Method I am using to update UI on recyclerView click
public void onExerciseClicked(int position) {
saveBtn.setText("Update");
clearBtn.setText("Delete");
}
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_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/gradientfrozen"
android:id="@+id/constraint_layout21">
<LinearLayout
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#292929"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/textView5"
android:layout_width="327dp"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:paddingLeft="20dp"
android:layout_marginTop="10dp"
android:text="WEIGHT (kgs)"
android:textColor="@android:color/background_light"
android:textSize="16dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="75dp"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:orientation="horizontal">
<Button
android:id="@+id/dec_weight"
android:layout_width="1dp"
android:layout_height="50dp"
android:layout_weight="0.5"
android:background="@drawable/down22"
android:textColor="@color/design_default_color_background" />
<EditText
android:id="@+id/editTextWeight"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_weight="1"
android:backgroundTint="@color/green"
android:ems="10"
android:gravity="center"
android:hint="0.0"
android:inputType="numberDecimal"
android:singleLine="false"
android:textColor="@color/design_default_color_background"
android:textColorHint="@color/light_grey"
android:textSize="30sp" />
<Button
android:id="@+id/inc_weight"
android:layout_width="1dp"
android:layout_height="50dp"
android:layout_weight="0.5"
android:background="@drawable/up22" />
</LinearLayout>
<TextView
android:id="@+id/textView8"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="20dp"
android:text="REPS"
android:textColor="@android:color/background_light"
android:textSize="16dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="80dp"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:orientation="horizontal">
<Button
android:id="@+id/dec_reps"
android:layout_width="1dp"
android:layout_height="50dp"
android:layout_weight="1.6"
android:background="@drawable/down22"
android:shadowColor="@color/design_default_color_background" />
<EditText
android:id="@+id/editTextReps"
android:layout_width="161dp"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_weight="1"
android:backgroundTint="@color/green"
android:ems="10"
android:gravity="center"
android:hint="0"
android:inputType="number"
android:textColor="@color/design_default_color_background"
android:textColorHint="@color/light_grey"
android:textSize="30sp" />
<Button
android:id="@+id/inc_reps"
android:layout_width="1dp"
android:layout_height="50dp"
android:layout_weight="1.6"
android:background="@drawable/up22" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:orientation="horizontal">
<Button
android:id="@+id/save_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_weight="1"
android:background="@drawable/my_small_green_shape"
android:text="Save"
android:textColor="#ffffff"
android:textSize="20sp" />
<Button
android:id="@+id/clear_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_weight="1"
android:background="@drawable/my_small_red_shape"
android:text="Clear"
android:textColor="#ffffff"
android:textSize="20sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:orientation="horizontal">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="Set"
android:textColor="@android:color/holo_green_light" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="Kgs"
android:textColor="@android:color/holo_green_light" />
<TextView
android:id="@+id/textView7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="Reps"
android:textColor="@android:color/holo_green_light" />
</LinearLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/completed_exercise_ListView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="25dp"
android:layout_marginRight="25dp"
android:background="#292929"
tools:listitem="@layout/completed_exercise_item" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
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Answer
Using LinearLayout as a direct child of ConstraintLayout defeats the whole purpose of using ConstraintLayout. It is not a good practice to use nested layout from the performance point of view. Besides, if deleteBtn is direct child of ConstraintLayout, then setting the layout_width of saveBtn to match_constraint will enable it to take up the whole space if we change the visibility of deleteBtn to gone.