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Asked: 2026-05-31T08:21:37+00:00

I’m trying to make a viewpager that has editable text, but I don’t want

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I’m trying to make a viewpager that has editable text, but I don’t want the viewpager to scroll when a text box is being edited. I’m trying to disable the scrolling by using the beginFakeDrag and endFakeDrag functions of the viewpager which causes the viewpager to ignore all touch events. For some reason if you call beginFakeDrag followed by endFakeDrap it works fine, but when separated it throws the following error:

03-08 17:54:00.511: E/AndroidRuntime(31362): FATAL EXCEPTION: main
03-08 17:54:00.511: E/AndroidRuntime(31362): java.lang.NullPointerException
03-08 17:54:00.511: E/AndroidRuntime(31362):    at android.support.v4.view.ViewPager.endFakeDrag(ViewPager.java:1683)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at gtg.gis.RequestActivity$2.onFocusChange(RequestActivity.java:115)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at android.view.View.onFocusChanged(View.java:2742)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at android.widget.TextView.onFocusChanged(TextView.java:7080)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at android.view.View.clearFocus(View.java:2639)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at android.view.ViewGroup.clearFocus(ViewGroup.java:522)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at android.view.View.setFlags(View.java:4645)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at android.view.View.setVisibility(View.java:3116)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at gtg.gis.RequestActivity$1.onClick(RequestActivity.java:95)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at android.view.View.performClick(View.java:2485)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at android.view.View$PerformClick.run(View.java:9089)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at android.os.Handler.handleCallback(Handler.java:587)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at android.os.Handler.dispatchMessage(Handler.java:92)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at android.os.Looper.loop(Looper.java:130)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at android.app.ActivityThread.main(ActivityThread.java:3806)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at java.lang.reflect.Method.invokeNative(Native Method)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at java.lang.reflect.Method.invoke(Method.java:507)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
03-08 17:54:00.511: E/AndroidRuntime(31362):    at dalvik.system.NativeStart.main(Native Method)

Here is my code.

        commentBox.setOnFocusChangeListener(new EditText.OnFocusChangeListener()
        {

            public void onFocusChange(View v, boolean hasFocus)
            {
                if (hasFocus)
                {
                    InputMethodManager mgr = (InputMethodManager) getContext().getSystemService(
                            Context.INPUT_METHOD_SERVICE);
                    mgr.showSoftInput(v, InputMethodManager.SHOW_IMPLICIT);
                    _viewPager.beginFakeDrag();
                    return;
                }

                _viewPager.endFakeDrag();
                InputMethodManager mgr = (InputMethodManager) getContext().getSystemService(
                        Context.INPUT_METHOD_SERVICE);
                mgr.hideSoftInputFromWindow(v.getWindowToken(), 0);
            }
        });
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1 Answer

  1. Editorial Team

    Please check out my answer to another question about disabling the swiping of ViewPager: How do disable paging by swiping with finger in ViewPager but still be able to swipe programmatically?

    I’d just enhance it to have a boolean:

    private boolean mDisablePaging;

    Then add a getter/setter if you need it for that boolean.

    Then enhance onInterceptTouchEvent:

    @Override
public boolean onInterceptTouchEvent(MotionEvent arg0) {
    // Don't allow swiping to switch between pages if we disabled it
    if (mDisablePaging) {
       return false;
    }

    // Otherwise, do the normal behavior 
    return super.onInterceptTouchEvent(arg0);
}

    Then just set mDisablePaging to true when you detect that the user is editing the text box.

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