93 lines
2.8 KiB
Java
93 lines
2.8 KiB
Java
/*
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* Copyright 2018 Martijn Brekhof. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.xbmc.kore.ui;
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import android.database.Cursor;
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import android.support.v7.widget.RecyclerView;
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import android.view.View;
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abstract public class RecyclerViewCursorAdapter extends RecyclerView.Adapter<RecyclerViewCursorAdapter.CursorViewHolder> {
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private boolean dataValid;
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private int rowIDColumn;
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private Cursor cursor;
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@Override
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public void onBindViewHolder(CursorViewHolder holder, int position) {
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if (!dataValid) {
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throw new IllegalStateException("Cannot bind viewholder when cursor is in invalid state.");
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}
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if (!cursor.moveToPosition(position)) {
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throw new IllegalStateException("Could not move cursor to position " + position + " when trying to bind viewholder");
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}
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holder.bindView(cursor);
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}
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@Override
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public int getItemCount() {
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if (dataValid) {
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return cursor.getCount();
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} else {
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return 0;
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}
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}
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@Override
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public long getItemId(int position) {
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if (!dataValid) {
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throw new IllegalStateException("Cursor is in an invalid state.");
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}
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if (!cursor.moveToPosition(position)) {
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throw new IllegalStateException("Could not move cursor to position " + position);
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}
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return cursor.getLong(rowIDColumn);
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}
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public void swapCursor(Cursor newCursor) {
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if (newCursor == cursor) {
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return;
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}
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if (newCursor != null) {
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cursor = newCursor;
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rowIDColumn = cursor.getColumnIndexOrThrow("_id");
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dataValid = true;
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notifyDataSetChanged();
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} else {
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notifyItemRangeRemoved(0, getItemCount());
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cursor = null;
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rowIDColumn = -1;
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dataValid = false;
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}
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}
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abstract public static class CursorViewHolder extends RecyclerView.ViewHolder {
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public CursorViewHolder(View itemView) {
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super(itemView);
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itemView.setTag(this);
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}
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/**
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* Called to update the content of {@link RecyclerView.ViewHolder#itemView} this holder holds.
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*/
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abstract public void bindView(Cursor cursor);
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}
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}
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