ScrollView's child cannot get ACTION_MOVE and ACTION_UP event when touch child and scroll vertically

Question

I have some views in ScrollView. The problem is when I touch the child view and scroll it vertically, the child view can only get ACTION_DOWN and ACTION_CANCEL event. The ACTION_MOVE and ACTION_UP event is missed.
If I touch the child view and scroll it horizontally, the child view can get all the touch event just as expected.
Here is my code:
xml file:

<?xml version="1.0" encoding="utf-8"?> <ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <TextView android:id="@+id/sv_test_tv" android:layout_width="match_parent" android:layout_height="100dp" android:gravity="center" android:text="This is some text." android:textSize="30sp" /> <View android:layout_width="match_parent" android:layout_height="300dp" android:background="#faa" /> <View android:layout_width="match_parent" android:layout_height="300dp" android:background="#faf" /> </LinearLayout> </ScrollView>

java code:

@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.sv_test); TextView tv = (TextView) findViewById(R.id.sv_test_tv); tv.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { LogUtils.v("ScrollViewTest", "onTouch:" + getType(event.getAction())); return true; } }); } private String getType(int type) { switch (type) { case MotionEvent.ACTION_DOWN: { return "ACTION_DOWN"; } case MotionEvent.ACTION_MOVE: { return "ACTION_MOVE"; } case MotionEvent.ACTION_UP: { return "ACTION_UP"; } } return "other:" + type; }

Anyone can help me？ Thanks a lot.

dn_c · Accepted Answer · 2015-07-15 08:46:25Z

You can add custom scrollview to your layout. Create your custom scrollView and use it in your layout.

public class VerticalScrollview extends ScrollView{ public VerticalScrollview(Context context) { super(context); } public VerticalScrollview(Context context, AttributeSet attrs) { super(context, attrs); } public VerticalScrollview(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { final int action = ev.getAction(); switch (action) { case MotionEvent.ACTION_DOWN: super.onTouchEvent(ev); break; case MotionEvent.ACTION_MOVE: return false; // redirect MotionEvents to ourself case MotionEvent.ACTION_CANCEL: super.onTouchEvent(ev); break; case MotionEvent.ACTION_UP: return false; default: break; } return false; } @Override public boolean onTouchEvent(MotionEvent ev) { super.onTouchEvent(ev); //Log.i("VerticalScrollview", "onTouchEvent. action: " + ev.getAction() ); return true; } }

Add <packagename..VerticalScrollview /> in place of ScrollView.

Community · Accepted Answer · 2017-05-23 12:14:13Z

This happens because the ScrollView intercepts the move event, Take a look at the ScrollView source code at onInterceptTouchEvent(MotionEvent ev) and it will be clearer. If u want a ScrollView inside of a ScrollView then i would suggest to take a look at this answer

Thank you very much. I know the reason now. I just have a TextView in ScrollView and I want the user can touch and move the position of the TextView. Thanks for @dn_c 's help I have solved my problem now.

Sirop4ik · Accepted Answer · 2017-06-02 22:04:43Z

Try this one

onInterceptTouchEvent only gets ACTION_DOWN

@Override public boolean dispatchTouchEvent(MotionEvent event) { MyLog.d(MyLog.DEBUG, "dispatchTouchEvent(): "+event.getAction()); if (isEnabled()) { MyLog.d(MyLog.DEBUG, "dispatchTouchEvent()2: "+event.getAction()); processEvent(event);//here you get all events include move & up super.dispatchTouchEvent(event); return true; //to keep receive event that follow down event } return super.dispatchTouchEvent(event); }

Akshay Rajeev · Accepted Answer · 2020-07-15 10:17:27Z

Try using this line

sv_test_tv.setMovementMethod(new ScrollingMovementMethod());

in the Activity File

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