/
RecyclerListAdapter.java
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/
RecyclerListAdapter.java
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/*
* Copyright (C) 2015 Paul Burke
*
* 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.
*/
package co.paulburke.android.itemtouchhelperdemo;
import android.content.Context;
import android.graphics.Color;
import android.support.v4.view.MotionEventCompat;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import co.paulburke.android.itemtouchhelperdemo.helper.ItemTouchHelperAdapter;
import co.paulburke.android.itemtouchhelperdemo.helper.ItemTouchHelperViewHolder;
import co.paulburke.android.itemtouchhelperdemo.helper.OnStartDragListener;
/**
* Simple RecyclerView.Adapter that implements {@link ItemTouchHelperAdapter} to respond to move and
* dismiss events from a {@link android.support.v7.widget.helper.ItemTouchHelper}.
*
* @author Paul Burke (ipaulpro)
*/
public class RecyclerListAdapter extends RecyclerView.Adapter<RecyclerListAdapter.ItemViewHolder>
implements ItemTouchHelperAdapter {
private final List<String> mItems = new ArrayList<>();
private final OnStartDragListener mDragStartListener;
public RecyclerListAdapter(Context context, OnStartDragListener dragStartListener) {
mDragStartListener = dragStartListener;
mItems.addAll(Arrays.asList(context.getResources().getStringArray(R.array.dummy_items)));
}
@Override
public ItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_main, parent, false);
ItemViewHolder itemViewHolder = new ItemViewHolder(view);
return itemViewHolder;
}
@Override
public void onBindViewHolder(final ItemViewHolder holder, int position) {
holder.textView.setText(mItems.get(position));
// Start a drag whenever the handle view it touched
holder.handleView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (MotionEventCompat.getActionMasked(event) == MotionEvent.ACTION_DOWN) {
mDragStartListener.onStartDrag(holder);
}
return false;
}
});
}
@Override
public void onItemDismiss(int position) {
mItems.remove(position);
notifyItemRemoved(position);
}
@Override
public boolean onItemMove(int fromPosition, int toPosition) {
Collections.swap(mItems, fromPosition, toPosition);
notifyItemMoved(fromPosition, toPosition);
return true;
}
@Override
public int getItemCount() {
return mItems.size();
}
/**
* Simple example of a view holder that implements {@link ItemTouchHelperViewHolder} and has a
* "handle" view that initiates a drag event when touched.
*/
public static class ItemViewHolder extends RecyclerView.ViewHolder implements
ItemTouchHelperViewHolder {
public final TextView textView;
public final ImageView handleView;
public ItemViewHolder(View itemView) {
super(itemView);
textView = (TextView) itemView.findViewById(R.id.text);
handleView = (ImageView) itemView.findViewById(R.id.handle);
}
@Override
public void onItemSelected() {
itemView.setBackgroundColor(Color.LTGRAY);
}
@Override
public void onItemClear() {
itemView.setBackgroundColor(0);
}
}
}