android.widget.TextView#getTranslationY ( )源码实例Demo

@Override
public void onNestedPreScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull TextView child, @NonNull View target, int dx, int dy, @NonNull int[] consumed, int type) {
    super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed, type);
    if (target instanceof RecyclerView) {
        RecyclerView list = (RecyclerView) target;
        //列表第一个全部可见Item的位置
        int pos = ((LinearLayoutManager) list.getLayoutManager()).findFirstCompletelyVisibleItemPosition();
        if (pos == 0 && pos < lastPosition) {
            downReach = true;
        }

        if (canScroll(child, dy) && pos == 0) {
            float finalY = child.getTranslationY() - dy;
            if (finalY < -child.getHeight()) {
                finalY = -child.getHeight();
                upReach = true;
            } else if (finalY > 0) {
                finalY = 0;
            }
            child.setTranslationY(finalY);
            consumed[1] = dy;
        }
        lastPosition = pos;
    }
}
 

@Override
protected void onFinishInflate() {
    super.onFinishInflate();

    mGreenView1 = (TextView) findViewById(R.id.greenView1);
    mGreenView1TranslationY = mGreenView1.getTranslationY();
    mGreenColor = getResources().getColor(android.R.color.holo_green_light);
}
 

@Override
protected void onFinishInflate() {
    super.onFinishInflate();

    mGreenView1 = (TextView) findViewById(R.id.greenView1);
    mGreenView1TranslationY = mGreenView1.getTranslationY();
    mGreenColor = getResources().getColor(android.R.color.holo_green_light);
}