Wie zu überprüfen, ob Bildlauf ist nach unten scrollen Android Studio

Question

Ich habe Scrollview decken viele Elemente im Inneren. Und ich möchte überprüfen, ob scrollview Scroll bis zum Ende scrool ist. Wie man das umsetzt. bitte jemand empfehle mich. Vielen Dank.

<ScrollView 
    android:id="@+id/scrollview" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentTop="true" > 

     <LinearLayout 
      android:id="@+id/layout" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:orientation="vertical" 
      android:showDividers="end|middle" > 
       <TextView 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:text=" 
       text....... 
       " /> 
       <TextView 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:text=" 
        text....... 
       " /> 
     </LinearLayout> 
    </ScrollView> 

Answer 1

Erstellen Sie eine benutzerdefinierte Scrollview wie folgt:

public class CustomScrollView erstreckt Scroll {OnBottomReachedListener mListener;

public CustomScrollView(Context context, AttributeSet attrs, 
        int defStyle) { 
super(context, attrs, defStyle); 
} 

public CustomScrollView(Context context, AttributeSet attrs) { 
super(context, attrs); 
} 

public CustomScrollView(Context context) { 
super(context); 
} 

@Override 
protected void onScrollChanged(int l, int t, int oldl, int oldt) { 
View view = getChildAt(getChildCount() - 1); 
int diff = (view.getBottom() - (getHeight() + getScrollY())) - view.getPaddingBottom(); 

if (diff <= 0 && mListener != null) { 
    mListener.onBottomReached(); 
} 

super.onScrollChanged(l, t, oldl, oldt); 
} 

// Getters & Setters 

public OnBottomReachedListener getOnBottomReachedListener() { 
return mListener; 
} 

public void setOnBottomReachedListener(
    OnBottomReachedListener onBottomReachedListener) { 
mListener = onBottomReachedListener; 
} 

//Event listener. 

public interface OnBottomReachedListener { 
public void onBottomReached(); 
} 

}

In Ihrer Haupttätigkeit:

CustomScrollView scroll = (CustomScrollView) findViewById (R.id.scrollView);

scrollView.setOnBottomReachedListener (neu CustomScrollView.OnBottomReachedListener() {

@Override 
    public void onBottomReached() { 
     // ScrollView Reached bottom 
    } 
}); 

in der XML-Datei:

<CustomScrollView android:id="@+id/scrollView" android:layout_width="match_parent" android:layout_height="wrap_content" > 

</CustomScrollView> 

Answer 2

Sie können dies tun, indem die Höhe des ScrollView zu vergleichen und Ihre LinearLayout:

ScrollView scrollView = (ScrollView) findViewById(R.id.scrollview); 
LinearLayout linearLayout = (LinearLayout) findViewById(R.id.layout); 

if(linearLayout.getMeasuredHeight() <= scrollView.getScrollY() + 
     scrollView.getHeight()) { 
    //scroll view is at the very bottom 
} 
else { 
    //scroll view is in somewhere middle 
}