6 June 2024 Leave a comment Tech-Help
ViewPager is a popular component in Android development used to create swipeable views. However, there are cases where you might want to disable the swipe gesture while still allowing programmatic swiping. This article will guide you through the necessary steps to achieve this.
Subclassing ViewPager
One effective approach is to subclass ViewPager and override specific touch event methods. This method ensures that swiping by touch is disabled, but programmatic swiping remains functional.
Step-by-Step Implementation
Follow these steps to create a custom ViewPager that disables swipe gestures:
1. Create a Custom ViewPager Class
Add the following class to your src folder:
import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.animation.DecelerateInterpolator;
import android.widget.Scroller;
import java.lang.reflect.Field;
public class NonSwipeableViewPager extends ViewPager {
public NonSwipeableViewPager(Context context) {
super(context);
setMyScroller();
}
public NonSwipeableViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
setMyScroller();
}
@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
// Never allow swiping to switch between pages
return false;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// Never allow swiping to switch between pages
return false;
}
// For smooth scrolling
private void setMyScroller() {
try {
Class viewpager = ViewPager.class;
Field scroller = viewpager.getDeclaredField("mScroller");
scroller.setAccessible(true);
scroller.set(this, new MyScroller(getContext()));
} catch (Exception e) {
e.printStackTrace();
}
}
public class MyScroller extends Scroller {
public MyScroller(Context context) {
super(context, new DecelerateInterpolator());
}
@Override
public void startScroll(int startX, int startY, int dx, int dy, int duration) {
super.startScroll(startX, startY, dx, dy, 350 /*1 sec*/);
}
}
}
2. Update Your Layout File
Make sure to use your custom ViewPager in your layout file:
<com.yourcompany.NonSwipeableViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
Alternative: Using ViewPager2
If you are using ViewPager2, the process is even simpler. ViewPager2 includes a built-in method to disable user-initiated scrolling:
viewPager2.setUserInputEnabled(false);
To enable user-initiated scrolling again, use:
viewPager2.setUserInputEnabled(true);
Conclusion
Disabling swipe gestures in ViewPager while allowing programmatic swiping can be easily achieved by subclassing ViewPager or using the built-in properties of ViewPager2. Implementing these solutions can enhance the user experience by providing a controlled navigation flow within your app.
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