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onTouchEventでmoveしたときの速度を取る方法

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上記を翻訳、まとめてみた。


private VelocityTracker mVelocityTracker = null;
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int index = event.getActionIndex();
        int action = event.getActionMasked();
        int pointerId = event.getPointerId(index);

        switch(action) {
            case MotionEvent.ACTION_DOWN:
                if(mVelocityTracker == null) {
                    //  動きの速度を監視する新しいVelocityTrackerオブジェクトを取得します。
                    mVelocityTracker = VelocityTracker.obtain();
                }
                else {
                    // 速度トラッカーを初期状態にリセットします。
                    mVelocityTracker.clear();
                }
                // Add a user's movement to the tracker.
                mVelocityTracker.addMovement(event);
                break;
            case MotionEvent.ACTION_MOVE:
                mVelocityTracker.addMovement(event);
              //速度を決定する場合、computeCurrentVelocity()を呼び出します。
              //その後、getXVelocity()を呼び出します
              //getYVelocity()は各ポインタIDの速度を取得します。
                mVelocityTracker.computeCurrentVelocity(1000);
               
                break;
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL:
                // 他のユーザーによって再利用されるようにバックVelocityTrackerオブジェクトを返します。
                break;
        }
        return true;
    }
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