Forked from skyfishjy/CursorRecyclerViewAdapter.java
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CursorRecyclerViewAdapter
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/* | |
* Copyright (C) 2014 skyfish.jy@gmail.com | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
* | |
*/ | |
import android.content.Context; | |
import android.database.Cursor; | |
import android.database.DataSetObserver; | |
import android.support.v7.widget.RecyclerView; | |
import java.util.ArrayList; | |
import java.util.List; | |
/** | |
* Created by skyfishjy on 10/31/14. | |
*/ | |
public abstract class CursorRecyclerViewAdapter<VH extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<VH> { | |
private Context mContext; | |
private Cursor mCursor; | |
private boolean mDataValid; | |
private int mRowIdColumn; | |
private DataSetObserver mDataSetObserver; | |
public CursorRecyclerViewAdapter(Context context, Cursor cursor) { | |
mContext = context; | |
mCursor = cursor; | |
mDataValid = cursor != null; | |
mRowIdColumn = mDataValid ? mCursor.getColumnIndex("_id") : -1; | |
mDataSetObserver = new NotifyingDataSetObserver(); | |
if (mCursor != null) { | |
mCursor.registerDataSetObserver(mDataSetObserver); | |
} | |
} | |
public abstract boolean isSelectable(); | |
public abstract void setSelectable(boolean selectable); | |
public abstract void setSelectedAll(boolean selected); | |
protected abstract boolean isSelected(int position); | |
public abstract boolean isAllSelected(); | |
public abstract boolean isMultipleSelection(); | |
public abstract boolean isSingleSelection(); | |
public abstract void toggleSelection(int pos); | |
public abstract void clearSelections(); | |
public abstract int getSelectedItemCount(); | |
public abstract List<Integer> getSelectedItems(); | |
public abstract int deleteSelectedItems(); | |
public Cursor getCursor() { | |
return mCursor; | |
} | |
@Override | |
public int getItemCount() { | |
if (mDataValid && mCursor != null) { | |
return mCursor.getCount(); | |
} | |
return 0; | |
} | |
protected Context getContext() { | |
return mContext; | |
} | |
@Override | |
public long getItemId(int position) { | |
if (mDataValid && mCursor != null && mCursor.moveToPosition(position)) { | |
return mCursor.getLong(mRowIdColumn); | |
} | |
return 0; | |
} | |
@Override | |
public void setHasStableIds(boolean hasStableIds) { | |
super.setHasStableIds(true); | |
} | |
public abstract void onBindViewHolder(VH viewHolder, Cursor cursor); | |
@Override | |
public void onBindViewHolder(VH viewHolder, int position) { | |
if (!mDataValid) { | |
throw new IllegalStateException("this should only be called when the cursor is valid"); | |
} | |
if (!mCursor.moveToPosition(position)) { | |
throw new IllegalStateException("couldn't move cursor to position " + position); | |
} | |
onBindViewHolder(viewHolder, mCursor); | |
} | |
/** | |
* Change the underlying cursor to a new cursor. If there is an existing cursor it will be | |
* closed. | |
*/ | |
public void changeCursor(Cursor cursor) { | |
Cursor old = swapCursor(cursor); | |
if (old != null) { | |
old.close(); | |
} | |
} | |
/** | |
* Swap in a new Cursor, returning the old Cursor. Unlike | |
* {@link #changeCursor(Cursor)}, the returned old Cursor is <em>not</em> | |
* closed. | |
*/ | |
public Cursor swapCursor(Cursor newCursor) { | |
if (newCursor == mCursor) { | |
return null; | |
} | |
final Cursor oldCursor = mCursor; | |
if (oldCursor != null && mDataSetObserver != null) { | |
oldCursor.unregisterDataSetObserver(mDataSetObserver); | |
} | |
mCursor = newCursor; | |
if (mCursor != null) { | |
if (mDataSetObserver != null) { | |
mCursor.registerDataSetObserver(mDataSetObserver); | |
} | |
mRowIdColumn = newCursor.getColumnIndexOrThrow("_id"); | |
mDataValid = true; | |
notifyDataSetChanged(); | |
} else { | |
mRowIdColumn = -1; | |
mDataValid = false; | |
notifyDataSetChanged(); | |
//There is no notifyDataSetInvalidated() method in RecyclerView.Adapter | |
} | |
return oldCursor; | |
} | |
/** | |
* Swap in a new Cursor, returning the old Cursor. Unlike | |
* {@link #changeCursor(Cursor)}, the returned old Cursor is <em>not</em> | |
* closed. | |
*/ | |
public Cursor disableCursor() { | |
final Cursor oldCursor = mCursor; | |
if (oldCursor != null && mDataSetObserver != null) { | |
oldCursor.unregisterDataSetObserver(mDataSetObserver); | |
} | |
mCursor = null; | |
mRowIdColumn = -1; | |
mDataValid = false; | |
return oldCursor; | |
} | |
public void notifyItemRemove(int position) { | |
super.notifyItemRangeRemoved(position, 1); | |
} | |
private class NotifyingDataSetObserver extends DataSetObserver { | |
@Override | |
public void onChanged() { | |
super.onChanged(); | |
mDataValid = true; | |
notifyDataSetChanged(); | |
} | |
@Override | |
public void onInvalidated() { | |
super.onInvalidated(); | |
mDataValid = false; | |
notifyDataSetChanged(); | |
//There is no notifyDataSetInvalidated() method in RecyclerView.Adapter | |
} | |
} | |
} |
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Added few abstract methods to support ListView alike methods