setTranslationY()

本文详细介绍了如何使用setTranslationY方法来调整Android控件的垂直位置。通过此方法可以在布局后精确控制控件的位置,实现更灵活的UI设计。

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Sets the vertical location of this view relative to its top position. This effectively positions the object post-layout;
设置这个控件相对于其顶部位置的垂直位置。这有效地定位在对象的布局后
一、对控件使用setTranslationY(i),意味着在竖直方向上将该控件从它本来的位置偏移i个像素,如果一个父控件中包含了一个子控件,对父控件调用了该方法,那么父控件的TranslationY = i,而子控件的TranslationY = 0;

public class SimpleItemTouchHelperCallback extends ItemTouchHelper.Callback { private final AppIconAdapter mAdapter; private ObjectAnimator currentShakeAnim; public SimpleItemTouchHelperCallback(AppIconAdapter adapter) { mAdapter = adapter; } @Override public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { if (viewHolder.getAdapterPosition() == 0) { return makeMovementFlags(0, 0); } int dragFlags; if (recyclerView.getLayoutManager() instanceof GridLayoutManager) { dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT; } else { dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN; } return makeMovementFlags(dragFlags, 0); } @Override public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) { if ((viewHolder.getAdapterPosition() == 0 || target.getAdapterPosition() == 0)) { return false; } mAdapter.notifyItemMoved(viewHolder.getAdapterPosition(), target.getAdapterPosition()); return true; } @Override public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) { } @Override public void onSelectedChanged(@Nullable RecyclerView.ViewHolder viewHolder, int actionState) { super.onSelectedChanged(viewHolder, actionState); if (actionState == ItemTouchHelper.ACTION_STATE_DRAG) { // 开始拖拽,启动抖动动画 viewHolder.itemView.setAlpha(1f); if (actionState == ItemTouchHelper.ACTION_STATE_DRAG && viewHolder != null && viewHolder.getAdapterPosition() != 0) { viewHolder.itemView.setAlpha(0.5f); } } else if (actionState != ItemTouchHelper.ACTION_STATE_DRAG) { // 如果状态不是拖拽(可能是闲置或滑动),则停止抖动动画 viewHolder.itemView.setAlpha(1f); } } @Override public void onChildDraw(@NonNull Canvas c, @NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) { if (actionState == ItemTouchHelper.ACTION_STATE_DRAG) { // final float alpha = 1.0f - Math.abs(dX) / (float) viewHolder.itemView.getWidth(); viewHolder.itemView.setAlpha(0.5f); viewHolder.itemView.setTranslationX(dX); viewHolder.itemView.setTranslationY(dY); } else { super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive); } } @Override public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { super.clearView(recyclerView, viewHolder); viewHolder.itemView.setAlpha(1f); viewHolder.itemView.setTranslationX(0); viewHolder.itemView.setTranslationY(0); } } 拖动结束后没有还原alpha值,请找出问题点所在并解决
最新发布
07-31
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