在使用项目触摸助手滑动删除之前确认对话框

Question

如何在删除回收器之前显示确认对话框查看项目使用项目触摸助手。 我创建了RecyclerView并实现了基本的ItemTouchHelper.Callback类。但是，我不知道下一步该怎么做。

我已经创建了下面的类并将其附加到Recyclerview。刷出该项目有效。但是我想在移动项目之前显示确认对话框。

class SwipeController extends Callback {
public SwipeController( ) {
}
@Override
public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
return makeMovementFlags(0, START);
}
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
return false;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
}
}

Answer 1

以下是我如何实现所需的行为，假设如果按下"是"，该项目将被删除，否则什么都不做：

new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
return false;
}
// Called when a user swipes left or right on a ViewHolder
@Override
public void onSwiped(final RecyclerView.ViewHolder viewHolder, int swipeDir) {
// Here is where you'll implement swipe to delete
new AlertDialog.Builder(viewHolder.itemView.getContext())
.setMessage("Are you sure?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// Get the position of the item to be deleted
int position = viewHolder.getAdapterPosition();
// Then you can remove this item from the adapter 
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User cancelled the dialog, 
// so we will refresh the adapter to prevent hiding the item from UI
mAdapter.notifyItemChanged(viewHolder.getAdapterPosition());
}
})
.create()
.show();
}
}).attachToRecyclerView(mRecyclerView);

Answer 2

在onSwiped中，添加带有正按钮和负按钮的AlertDialog，每个操作都需要执行操作。 示例代码如下：

@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int arg1) {
// Your action
dialog.cancel();
};
});
builder.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int arg1) {
dialog.cancel();
};
});
}

Answer 3

@Override
public void onSwiped(final RecyclerView.ViewHolder viewHolder, int direction, int position) {
Log.d(TAG, "onSwiped() position=" + position + " direction=" + direction);
// get item details
final String itemIndex = cartList.get(viewHolder.getAdapterPosition()).getIndex();
String itemSubjekt = cartList.get(viewHolder.getAdapterPosition()).getSubjekt();
String itemPrio = cartList.get(viewHolder.getAdapterPosition()).getPrio();

// from right to left = delete line
if ((viewHolder instanceof CartListAdapter.MyViewHolder) && (direction == 4)){
Log.d(TAG, "onSwiped() delete");
Context context = viewHolder.itemView.getContext();
AlertDialog adDelete = new AlertDialog.Builder(context).create();
adDelete.setTitle(context.getResources().getString(R.string.dialog_delete_nadpis));
adDelete.setMessage(context.getResources().getString(R.string.dialog_delete_really));
adDelete.setButton(DialogInterface.BUTTON_POSITIVE, "ANO", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Log.d(TAG, "Dialog delete - vybrano ANO");
final Item deletedItem = cartList.get(viewHolder.getAdapterPosition());
// final int deletedIndex = viewHolder.getAdapterPosition();
// code here to delete item in db

}
});
adDelete.setButton(DialogInterface.BUTTON_NEGATIVE, "NE", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Log.d(TAG, "Dialog delete - vybrano NE");
mAdapter.notifyItemChanged(viewHolder.getAdapterPosition());
}
});
adDelete.show();

}

// from left to right = Edit line
if ((viewHolder instanceof CartListAdapter.MyViewHolder) && (direction == 8)){
Log.d(TAG, "onSwiped() edit");

}

}

Answer 4

感谢您的@AhmedAbdelaal

科特林版本

override fun onSwiped(viewHolder: RecyclerView.ViewHolder, i: Int) {
if (enableConfirmDialogBeforeSwiped) {
val alertDialogBuilder = AlertDialogBuilder(viewHolder.itemView.context)
alertDialogBuilder.title("提示")
alertDialogBuilder.message("确定删除该数据吗？")
alertDialogBuilder.positiveButton("确定") {
// remove this item
mAdapter.onItemDismiss(viewHolder.adapterPosition)
}
alertDialogBuilder.negativeButton("取消") {
// User cancelled the dialog, so we will refresh the adapter to prevent hiding the item from UI
mAdapter.notifyItemChanged(viewHolder.adapterPosition)
}
alertDialogBuilder.show()
} else {
// remove this item
mAdapter.onItemDismiss(viewHolder.adapterPosition)
}
}