CODEWITHSUNDEEP
androidandroid-edittextscrollviewtouch-eventmotionevent
A.AL
A.AL

Reputation: 145

ScrollView get back to top

So i have scrollView that has only one view on it (EditText), and i want to implement the

dispatchTouchEvent(MotionEvent me)
 View current_view = Processor.findViewGroupWithPoint(
            (int) me.getRawX(), (int) me.getRawY(), rmodel.layout.parent);
    if (current_view instanceof ScrollView) {


        switch( me.getAction() ){
        case MotionEvent.ACTION_DOWN:
            Log.d(TAG, " down");

            ((ScrollView) findViewById(111111)).fullScroll(View.FOCUS_DOWN);

            break;
        case MotionEvent.ACTION_UP:
            Log.d(TAG, " up");
((ScrollView) findViewById(111111)).fullScroll(View.FOCUS_UP);
            break;
        }

}

My problem is, when i scroll down, it works, but i have to hold my finger on the screen, as if i removed it, it will get back to top of the scrollView.

Upvotes: 1

Views: 905

Answers (1)

Tristan
Tristan

Reputation: 3578

As far as I can tell it goes to the top of the scrollView when you let go because you tell it to. you say 

case MotionEvent.ACTION_UP:
    Log.d(TAG, " up");
    ((ScrollView) findViewById(111111)).fullScroll(View.FOCUS_UP);

MotionEvent.ACTION_UP is used to detect when your finger is released, so when it does in this you tell it to go to the top with 

((ScrollView) findViewById(111111)).fullScroll(View.FOCUS_UP);

To fix this, all you really have to do is remove that line...

EDIT:

I wrote this up and it should work, might need some tweaks. 

boolean bottom = false;

Basically here just create a boolean called bottom and set it to false ^^

case MotionEvent.ACTION_DOWN:
    Log.d(TAG, " down");

    if (bottom = false){
        ((ScrollView) findViewById(111111)).fullScroll(View.FOCUS_DOWN);
    }else{
        ((ScrollView) findViewById(111111)).fullScroll(View.FOCUS_UP);
    }
    break;
}

This is just seeing if the ScrollView is at the bottom or now... Hope it works!

Upvotes: 1

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