短視訊系統，長按側滑實現刪除的按鈕
短視訊系統，長按側滑實現刪除的按鈕實現的相關程式碼
1,導包
implementation ‘com.android.support:recyclerview-v7:27.1.1’
2,Xml檔案
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android=" android:layout_height="match_parent"> <android.support.v7.widget.RecyclerView android:id="@+id/rv_linear_list" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginTop="20dp"/> </android.support.constraint.ConstraintLayout>
3,Activity
public class RvItemTouchActivity extends AppCompatActivity {
private android.support.v7.widget.RecyclerView rvlinearlist;
private ArrayList<String> mData;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_linear);
this.rvlinearlist = (RecyclerView) findViewById(R.id.rv_linear_list);
initData();
initAdapter();
}
private void initAdapter() {
//線性佈局拖拽
rvlinearlist.setLayoutManager(new LinearLayoutManager(this));
//自定義類實現拖拽,側滑刪除
RvItemTouchAdapter adapter = new RvItemTouchAdapter(this, mData);
new ItemTouchHelper(new MyItemTouchHandler(adapter)).attachToRecyclerView(rvlinearlist);
rvlinearlist.setAdapter(adapter);
/* //庫實現
RvItemTouchAdapter2 adapter2 = new RvItemTouchAdapter2(R.layout.item_rv_linear2, mData);
rvlinearlist.setAdapter(adapter2);
ItemDragAndSwipeCallback itemDragAndSwipeCallback = new ItemDragAndSwipeCallback(adapter2);
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(itemDragAndSwipeCallback);
itemTouchHelper.attachToRecyclerView(rvlinearlist);
// 開啟拖拽
adapter2.enableDragItem(itemTouchHelper);
adapter2.setOnItemDragListener(onItemDragListener);
// 開啟滑動刪除
adapter2.enableSwipeItem();
adapter2.setOnItemSwipeListener(onItemSwipeListener);
*/
}
OnItemDragListener onItemDragListener = new OnItemDragListener() {
@Override
public void onItemDragStart(RecyclerView.ViewHolder viewHolder, int pos){}
@Override
public void onItemDragMoving(RecyclerView.ViewHolder source, int from, RecyclerView.ViewHolder target, int to) {
//移動位置互換
Collections.swap(mData,from,to);
}
@Override
public void onItemDragEnd(RecyclerView.ViewHolder viewHolder, int pos) {}
};
OnItemSwipeListener onItemSwipeListener = new OnItemSwipeListener() {
@Override
public void onItemSwipeStart(RecyclerView.ViewHolder viewHolder, int pos) {
Log.e("MMM", "onItemSwipeStart: "+pos );
}
@Override
public void clearView(RecyclerView.ViewHolder viewHolder, int pos) {
Log.e("MMM", "clearView: "+pos);
}
@Override
public void onItemSwiped(RecyclerView.ViewHolder viewHolder, int pos) {
Log.e("MMM", "onItemSwiped: "+pos);
}
@Override
public void onItemSwipeMoving(Canvas canvas, RecyclerView.ViewHolder viewHolder, float dX, float dY, boolean isCurrentlyActive) {
//正在滑動監聽
}
};
private void initData() {
mData = new ArrayList<>();
for (int i = 0; i < 10; i++) {
mData.add("頻道"+i);
}
}
}
4,Adapter
public class RvItemTouchAdapter extends MyItemTouchHandler.ItemTouchAdapterImpl {
private final LayoutInflater mLayoutInflater;
private Context mContext;
private List<String>mData;
public RvItemTouchAdapter(Context context, List<String> data) {
mContext = context;
mData = data;
mLayoutInflater = LayoutInflater.from(context);
}
@Override
public void onItemMove(int fromPosition, int toPosition) {
//移動時交換位置
Collections.swap(mData,fromPosition,toPosition);
}
@Override
public void onItemRemove(int position) {
//移除監聽
mData.remove(position);
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = mLayoutInflater.inflate(R.layout.item_rv_linear2, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
if (holder instanceof ViewHolder) {
((ViewHolder) holder).tvTv.setText(mData.get(position));
}
}
@Override
public int getItemCount() {
return mData.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
TextView tvTv;
public ViewHolder(View itemView) {
super(itemView);
tvTv=itemView.findViewById(R.id.tv_item_rv_linear_text);
}
}
}
5,MyItemTouchHandler
public class MyItemTouchHandler extends ItemTouchHelper.Callback {
ItemTouchAdapterImpl adapter;
public MyItemTouchHandler(@NonNull ItemTouchAdapterImpl adapter) {
this.adapter = adapter;
}
/**
* 設定 允許拖拽和滑動刪除的方向
*/
@Override
public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
// 指定可 拖拽方向 和 滑動消失的方向
int dragFlags,swipeFlags;
RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
if (manager instanceof GridLayoutManager || manager instanceof StaggeredGridLayoutManager) {
// 上下左右都可以拖動
dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
} else {
// 可以上下拖動
dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
}
// 可以左右方向滑動消失
swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
// 如果某個值傳 0 , 表示不支援該功能
return makeMovementFlags(dragFlags, swipeFlags);
}
/**
* 拖拽後回撥,一般通過介面暴露給adapter, 讓adapter去處理資料的交換
*/
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
// 相同 viewType 之間才能拖動交換
if (viewHolder.getItemViewType() == target.getItemViewType()) {
int fromPosition = viewHolder.getAdapterPosition();
int toPosition = target.getAdapterPosition();
if (fromPosition < toPosition) {
//途中所有的item位置都要移動
for (int i = fromPosition; i < toPosition; i++) {
adapter.onItemMove(i, i + 1);
}
} else {
for (int i = fromPosition; i > toPosition; i--) {
adapter.onItemMove(i, i - 1);
}
}
adapter.notifyItemMoved(fromPosition, toPosition);
return true;
}
return false;
}
/**
* 滑動刪除後回撥,一般通過介面暴露給adapter, 讓adapter去刪除該條資料
*/
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
// 刪除資料
adapter.onItemRemove(viewHolder.getAdapterPosition());
// adapter 重新整理
adapter.notifyItemRemoved(viewHolder.getAdapterPosition());
}
@Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
if(actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
//滑動時改變Item的透明度
final float alpha = 1 - Math.abs(dX) / (float)viewHolder.itemView.getWidth();
viewHolder.itemView.setAlpha(alpha);
viewHolder.itemView.setTranslationX(dX);
}
}
/**
* item被選中(長按)
* 這裡改變了 item的背景色, 也可以通過介面暴露, 讓adapter去處理邏輯
*/
@Override
public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
if (actionState == ItemTouchHelper.ACTION_STATE_DRAG) {
// 拖拽狀態
viewHolder.itemView.setBackgroundColor(Color.BLUE);
}else if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
// 滑動刪除狀態
viewHolder.itemView.setBackgroundColor(Color.RED);
}
super.onSelectedChanged(viewHolder, actionState);
}
/**
* item取消選中(取消長按)
* 這裡改變了 item的背景色, 也可以通過介面暴露, 讓adapter去處理邏輯
*/
@Override
public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
viewHolder.itemView.setBackgroundColor(Color.TRANSPARENT);
super.clearView(recyclerView, viewHolder);
}
/**
* 是否支援長按開始拖拽,預設開啟 * 可以不開啟,然後在長按 item 的時候,手動 呼叫 mItemTouchHelper.startDrag(myHolder) 開啟,更加靈活
*/
@Override
public boolean isLongPressDragEnabled() {
return adapter.autoOpenDrag();
}
/**
* 是否支援滑動刪除,預設開啟 * 可以不開啟,然後在長按 item 的時候,手動 呼叫 mItemTouchHelper.startSwipe(myHolder) 開啟,更加靈活
*/
@Override
public boolean isItemViewSwipeEnabled() {
return adapter.autoOpenSwipe();
}
// 建議讓 adapter 實現該介面
public static abstract class ItemTouchAdapterImpl extends RecyclerView.Adapter{
public abstract void onItemMove(int fromPosition, int toPosition);
public abstract void onItemRemove(int position);
// 是否自動開啟拖拽
protected boolean autoOpenDrag(){
return true;
}
// 是否自動開啟滑動刪除
protected boolean autoOpenSwipe(){
return true;
}
}
}
以上就是短視訊系統，長按側滑實現刪除的按鈕實現的相關程式碼， 更多內容歡迎關注之後的文章
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/69978258/viewspace-2837882/，如需轉載，請註明出處，否則將追究法律責任。
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