I am creating a custom class to set the max height of a NestedScrollView
, based on the answer provided in this StackOverflow question:
How to set the Maximum Height for a NestedScrollView in Android?
However, when I include the custom class (MaxHeightNestedScrollView
) in my activity_main.xml
code layout, there is no scrollbar appearing when the TextView inside the MaxHeightNestedScrollView
exceeds the defined max height. Below is the code for MaxNestedScrollView
:
import android.content.Context;
import android.util.AttributeSet;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.widget.NestedScrollView;
public class MaxHeightNestedScrollView extends NestedScrollView {
private int maxHeight = -1;
public MaxHeightNestedScrollView(@NonNull Context context) {
super(context);
}
public MaxHeightNestedScrollView(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public MaxHeightNestedScrollView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public int getMaxHeight() {
return maxHeight;
}
public void setMaxHeight(int maxHeight) {
this.maxHeight = maxHeight;
}
public void setMaxHeightDensity(int dps){
this.maxHeight = (int)(dps * getContext().getResources().getDisplayMetrics().density);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (maxHeight > 0) {
heightMeasureSpec = MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.AT_MOST);
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
Below is the code for the attrs.xml
file in the values
folder:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="MaxHeightNestedScrollView">
<attr name="maxHeight" format="dimension" />
</declare-styleable>
</resources>
Below is the code for activity_main.xml
:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
android:layout_weight="1"
android:fillViewport="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Lorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum
\nLorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum
\nLorem ipsum\nLorem ipsum\nLorem ipsum" />
<com.example.testgradle.MaxHeightNestedScrollView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
app:maxHeight="130dp">
<TextView
android:id="@+id/textView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20dp"
android:textColor="#000000"
android:text="Lorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum
\nLorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum
\nLorem ipsum\nLorem ipsum\nLorem ipsumLorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum
\nLorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum
\nLorem ipsum\nLorem ipsum\nLorem ipsum" />
</com.example.testgradle.MaxHeightNestedScrollView>
<TextView
android:id="@+id/textView3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Lorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum
\nLorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum\nLorem ipsum
\nLorem ipsum\nLorem ipsum\nLorem ipsum" />
</LinearLayout>
</ScrollView>
</LinearLayout>