ScrollView disable focus move

I have a simple input form; it's a vertical LinearLayout with EditTexts inside a ScrollView.

<ScrollView android:layout_width="fill_parent"
    android:layout_height="wrap_content">
    <LinearLayout android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:orientation="vertical">
            <LinearLayout android:layout_width="fill_parent"
                  android:layout_height="wrap_content"
                  android:padding="10dip"
                  android:gravity="center_vertical"
                  android:orientation="horizontal">
                  <TextView style="@style/Text"
                         android:text="Name"/>
                  <EditText style="@style/EditBox"/>
            </LinearLayout>
            <View style="@style/Divider"/>
            <LinearLayout android:layout_width="fill_parent"
                  android:layout_height="wrap_content"
                  android:padding="10dip"
      开发者_如何学运维            android:gravity="center_vertical"
                  android:orientation="horizontal">
                  <TextView style="@style/Text"
                         android:text="Password"/>
                  <EditText style="@style/EditBox"/>
            </LinearLayout>               
            ... 
     </LinearLayout>
</ScrollView>

When the user scrolls the form, it automatically moves its focus to the visible EditText. It is possible to disable such behavior and always keep focus on the EditText currently selected by touch?

I understand that this may be a feature, but I need to disable it.

Thanks!

Just thought I'd share my solution to this. Even though some of the other answer's comments state that you cannot override this behavior, that is not true. This behavior stops as soon as you override the onRequestFocusInDescendants() method. So simply create your ScrollView extension to do this:

public class NonFocusingScrollView extends ScrollView {

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

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

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

  @Override
  protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
    return true;
  }

}

And you're done. The ScrollView will mess with your focus no more.

I have had such a problem too. The only way that helped me is to extend scroll view and to override neigher

@Override
public ArrayList<View> getFocusables(int direction) {
    return new ArrayList<View>();
}

or

@Override
protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
    return true;
}

but to override ViewGroup.requestChildFocus(View child, View focused) method as following:

    @Override
    public void requestChildFocus(View child, View focused) {
        // avoid scrolling to focused view
        // super.requestChildFocus(child, focused);
    }

What worked for me was combining @dmon's and @waj's answers.

Only overriding onRequestFocusInDescendants() worked great when I was only dealing with EditTexts inside of the ScrollView, but when I started added multiple View types, it didn't work so well.

Only overriding getFocusables() did not work at all.

Overriding both onRequestFocusInDescendants() AND getFocusables() seems to work beautifully in all scenarios.

public class FixedFocusScrollView extends ScrollView {

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

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

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

  @Override
  public ArrayList<View> getFocusables(int direction) {
      return new ArrayList<View>();
  }

  @Override
  protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
    return true;
  }

}

I tried all solutions posted here but either didn't work on certain Android versions or it messed up with some other behavior like when switching between touch and non-touch mode (when you click buttons or use the trackpad).

I finally found that overriding the method getFocusables did the trick:

public class FixedFocusScrollView extends ScrollView {

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

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

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

  @Override
  public ArrayList<View> getFocusables(int direction) {
    return new ArrayList<View>();
  }

}

Try to cut the problem from the source (edit: i.e. move it to an XML file).

First, there must be a focusable element for that to happen. Make all focusable elements contained in that scroll into non-focusable elements. Make them focusable after the view is inflated and is visible.

android:focusable="false"
android:focusableInTouchMode="false"

I found another easy solution that works for my problem.

I got a ScrollView with an EditText at the top, and after it, a big list of TextViews, RatingBars and Buttons. The Buttons launch AlertDialogs, and when they pops up, the ScrollView moves to the top, to the EditText that is the one that still has the focus.

To solve it, I set in the onClick method of the Activity the requestFocusFromTouch() to the view clicked (in this case the Button).

public void onClick(View v) {
    v.requestFocusFromTouch();
    ...
}

So now when I click on a Button, the ScrollView moves and put that Button on the center of the screen, that was just what I wanted.

I hope it help.

This method is very effective，you can overload computeScrollDeltaToGetChildRectOnScreen and return 0

public class NoScrollFocusScrollView extends ScrollView {

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

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

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

    @Override
    protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) {
        return 0;
    }
}

For such behavior use nextFocusUp and nextFocusDown.

<EditText
    android:id="@+id/my_edit_text"
    android:nextFocusDown="@id/my_edit_text"
    android:nextFocusUp="@id/my_edit_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
</EditText>

Happened to me today, basically I was adding a View programmatically between some existing views, and Scroll automatically moved to focus that view. What I just did, is the following:

container.setFocusable( false );

This solved the issue for me. It may not be applicable in all situations, but works well for mine where the scrolling is done programmatically:

View originalFocus = getCurrentFocus();
scroller.fullScroll(View.FOCUS_DOWN);
if (originalFocus!=null) {originalFocus.requestFocusFromTouch();}