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| package com.qefee.pj.testrecyclerview;
import android.content.Context; import android.os.Bundle; import android.support.design.widget.FloatingActionButton; import android.support.design.widget.Snackbar; import android.support.v7.app.ActionBar; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.DefaultItemAnimator; import android.support.v7.widget.DividerItemDecoration; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.Toolbar; import android.support.v7.widget.helper.ItemTouchHelper; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import android.widget.Toast;
import java.util.ArrayList; import java.util.Collections; import java.util.List; import java.util.Random;
public class RecyclerView1Activity extends AppCompatActivity {
* 数据集合. */ private List<String> dataList; * RecyclerView的适配器. */ private MyAdapter adapter;
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_recycler_view1); initActionBar(); initFloatingActionButton();
initDataList(); initRecyclerView(); }
private void initFloatingActionButton() { FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); fab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) .setAction("Action", null).show(); } }); }
private void initActionBar() { Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); ActionBar actionBar = getSupportActionBar();
if (actionBar != null) { actionBar.setDisplayHomeAsUpEnabled(true); } }
private void initRecyclerView() { RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView); recyclerView.setLayoutManager(new LinearLayoutManager(this)); adapter = new MyAdapter(this, dataList); recyclerView.setAdapter(adapter); recyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL)); recyclerView.setItemAnimator(new DefaultItemAnimator()); MyItemTouchHelperCallback callback = new MyItemTouchHelperCallback(adapter); ItemTouchHelper itemTouchHelper = new ItemTouchHelper(callback); itemTouchHelper.attachToRecyclerView(recyclerView); }
private void initDataList() { dataList = new ArrayList<>();
for (int i = 0; i < 20; i++) { dataList.add(String.format("item %d", i)); } }
class MyItemTouchHelperCallback extends ItemTouchHelper.Callback {
MyAdapter adapter;
MyItemTouchHelperCallback(MyAdapter adapter) { this.adapter = adapter; }
@Override public boolean isLongPressDragEnabled() { return true; }
@Override public boolean isItemViewSwipeEnabled() { return true; }
@Override public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN; int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END; return makeMovementFlags(dragFlags, swipeFlags); }
@Override public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) { int from = viewHolder.getAdapterPosition(); int to = target.getAdapterPosition(); Collections.swap(adapter.dataList, from, to); adapter.notifyItemMoved(from, to); return true; }
@Override public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) { switch (direction) { case ItemTouchHelper.START: case ItemTouchHelper.END: int adapterPosition = viewHolder.getAdapterPosition(); adapter.dataList.remove(adapterPosition); adapter.notifyItemRemoved(adapterPosition); break; default: break; } } }
class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
Context context; List<String> dataList;
MyAdapter(Context context, List<String> dataList) { this.context = context; this.dataList = dataList; }
@Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(context); View view = inflater.inflate(android.R.layout.simple_list_item_1, parent, false); MyViewHolder vh = new MyViewHolder(view);
return vh; }
@Override public void onBindViewHolder(MyViewHolder holder, int position) { holder.text1.setText(dataList.get(position)); }
@Override public int getItemCount() { return dataList.size(); }
class MyViewHolder extends RecyclerView.ViewHolder {
TextView text1;
MyViewHolder(View itemView) { super(itemView);
text1 = (TextView) itemView;
text1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Toast.makeText(RecyclerView1Activity.this, String.format("text1 on click. index = %d", getAdapterPosition()), Toast.LENGTH_SHORT).show(); } });
text1.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View view) { Toast.makeText(RecyclerView1Activity.this, String.format("text1 on long click. index = %d", getAdapterPosition()), Toast.LENGTH_SHORT).show(); return true; } }); } } }
@Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_recycler_view_1, menu); return true; }
@Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId();
switch (id) { case R.id.itemAdd:
if (dataList.size() > 0) { Random random = new Random(); int nextInt = random.nextInt(dataList.size()); dataList.add(nextInt, String.format("这里是添加项 %d", nextInt));
adapter.notifyItemInserted(nextInt); return true; } else { int i = 0; dataList.add(i, String.format("这里是添加项 %d", i));
adapter.notifyItemInserted(i); }
return true; case R.id.itemDelete:
if (dataList.size() > 0) { Random random1 = new Random(); int nextInt1 = random1.nextInt(dataList.size()); dataList.remove(nextInt1);
adapter.notifyItemRemoved(nextInt1); return true; } else { Toast.makeText(this, "没有可删的了", Toast.LENGTH_SHORT).show(); } default: break; }
return super.onOptionsItemSelected(item); }
}
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