效果圖如下：側滑點選第幾張 主界面顯示第幾章
工具類：
public class MoveToPosition {
//目标項是否在最後一個可見項之後
private static boolean mShouldScroll;
//記錄目标項位置
private static int mToPosition;
public static void MoveToPosition(LinearLayoutManager manager, RecyclerView mRecyclerView, int n) {
int firstItem = manager.findFirstVisibleItemPosition();
int lastItem = manager.findLastVisibleItemPosition();
if (n <= firstItem) {
mRecyclerView.scrollToPosition(n);
}else if (n <= lastItem) {
int top = mRecyclerView.getChildAt(n - firstItem).getTop();
mRecyclerView.scrollBy(0, top);
}else {
// mRecyclerView.scrollToPosition(n);
manager.scrollToPositionWithOffset(n,0);
}
}
public static void smoothMoveToPosition(LinearLayoutManager manager, RecyclerView mRecyclerView, final int position) {
// 第一個可見位置
int firstItem = mRecyclerView.getChildLayoutPosition(mRecyclerView.getChildAt(0));
// 最後一個可見位置
int lastItem = mRecyclerView.getChildLayoutPosition(mRecyclerView.getChildAt(mRecyclerView.getChildCount() -1));
if (position < firstItem) {
// 第一種可能:跳轉位置在第一個可見位置之前
mRecyclerView.scrollToPosition(position);
}else if (position <= lastItem) {
// 第二種可能:跳轉位置在第一個可見位置之後
int movePosition = position - firstItem;
if (movePosition >=0 && movePosition < mRecyclerView.getChildCount()) {
int top = mRecyclerView.getChildAt(movePosition).getTop();
mRecyclerView.scrollBy(0, top);
}
}else {
// 第三種可能:跳轉位置在最後可見項之後
// mRecyclerView.smoothScrollToPosition(position);
// mToPosition = position;
// mShouldScroll = true;
// mRecyclerView.scrollToPosition(position);
manager.scrollToPositionWithOffset(position,0);
mToPosition = position;
mShouldScroll =true;
}
}
}
調用方法：
titleAdapter.setOnItemClickLitener(new TitleAdapter1.OnItemClickLitener() {
@Override
public void onItemClick(View view, int position) {
drawerlayout.closeDrawers();
MoveToPosition.smoothMoveToPosition(ContentLinearLayoutManager, recyclerView, position);
}
});