Android TV中,当一个页面上有多个RecyclerView控件时,焦点会出现问题,导致用户无法通过遥控器方便的控制不同的RecyclerView。如何解决这个问题?是否有方法可以让不同的RecyclerView控件共享焦点,以提高用户体验?
答:可以使用FocusGroupManager来管理多个RecyclerView的焦点。首先,将所有需要共享焦点的RecyclerView添加到同一个FocusGroupManager中。然后,重写RecyclerView的onKeyDown方法,当用户按下方向键时,获取当前RecyclerView所处的位置以及方向,并通过FocusGroupManager将焦点移动到要求的目标。
具体实现可以参考如下代码:
//在Activity中创建FocusGroupManager private FocusGroupManager mFocusGroupManager;
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); RecyclerView recyclerView1 = findViewById(R.id.recyclerView1); RecyclerView recyclerView2 = findViewById(R.id.recyclerView2); mFocusGroupManager = new FocusGroupManager(); mFocusGroupManager.addFocusableView(recyclerView1); mFocusGroupManager.addFocusableView(recyclerView2); }
//在RecyclerView的子类中重写onKeyDown方法 @Override public boolean onKeyDown(int keyCode, KeyEvent event) { int orientation = getOrientation(); if(orientation == OrientationHelper.HORIZONTAL){ switch (keyCode){ case KeyEvent.KEYCODE_DPAD_LEFT://左方向键 if(canScrollHorizontally(-1)){//是否能向左滑动 //如当前RecyclerView还有前一个子项,则向前一个子项移动焦点 View view = ((LinearLayoutManager) getLayoutManager()).findViewByPosition(getCurrentPosition() - 1); if(view != null){ mFocusGroupManager.setFocusView(view); return true; } } break; case KeyEvent.KEYCODE_DPAD_RIGHT://右方向键 if(canScrollHorizontally(1)){//是否能向右滑动 //如当前RecyclerView还有后一个子项,则向后一个子项移动焦点 View view = ((LinearLayoutManager) getLayoutManager()).findViewByPosition(getCurrentPosition() + 1); if(view != null){ mFocusGroupManager.setFocusView(view); return true; } } break; } }else{//垂直方向 switch (keyCode){ case KeyEvent.KEYCODE_DPAD_UP://上方向键 if(canScrollVertically(-1)){//是否能向上滑动 //如当前RecyclerView还有前一个子项,则向前一个子项移动焦点 View view = ((LinearLayoutManager) getLayoutManager()).findViewByPosition(getCurrentPosition() - 1); if(view != null){ mFocusGroupManager.setFocusView(view); return true; } } break; case KeyEvent.KEYCODE_DPAD_DOWN://下方向键 if(canScrollVertically(1)){//是否能向下滑动 //如当前RecyclerView还有后一个子项,则向后一个子项移动焦点 View view = ((LinearLayoutManager) getLayoutManager()).findViewByPosition(getCurrentPosition() + 1); if(view != null){ mFocusGroupManager.setFocusView(view); return true; } } break; } } return super.onKeyDown(keyCode, event); }