Detect Fling distance android

android

Solution

It is passed 3 years but no answer yet. I found some workaround to achieve it.

Actually it is kind of advanced topic as there are a lot of nuances but basically you can refer to Android source code(OverScroller class in particular) and use this method. You will need to copy it into your class and use it.

 private double getSplineFlingDistance(int velocity) {
     final double l = getSplineDeceleration(velocity);
     final double decelMinusOne = DECELERATION_RATE - 1.0;
     return mFlingFriction * PHYSICAL_COEF * Math.exp(DECELERATION_RATE / decelMinusOne * l);
 }

Other methods and values can be obtained from the same class. The link to the source code: https://android.googlesource.com/platform/frameworks/base/+/jb-release/core/java/android/widget/OverScroller.java

Keep in mind that in some devices the value can be different (not too much). Some vendors change the formula depending on their requirements and hardware to make it more smooth.

Problem

I am working on an application which requires me to manually handle the fling process rather than giving it to the framework. What I want to achieve is basically calculate the amount of pixels a listview moves when it receives a fling action. As the scroll method already provides distance in form of delta, I have handled it easily. But is there a way to get fling distance as only velocity parameter is being passed in the super method. Note- I have to move another view in accordance with the fling distance, so I need to get it simultaneously just like onScroll provides it. Thanks.

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