AndroidRecyclerView选择多个item的实现代码
模仿网易新闻客户端阅读偏好的频道选择,先看实现的页面:
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直接上代码:
import android.content.res.Resources; import android.content.res.TypedArray; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.DefaultItemAnimator; import android.support.v7.widget.GridLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.helper.ItemTouchHelper; import android.util.Log; import android.util.SparseBooleanArray; import android.view.View; import java.util.ArrayList; import java.util.Collections; import java.util.List; public class RecyclerViewActivity extends AppCompatActivity { private RecyclerView recycler; private RecyclerAdapter mAdapter; private Listchannels = new ArrayList<>(); private List channelsSelected; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_recycler_view_acitivity); initData(); initUI(); findViewById(R.id.resultBTN).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { int lens = channelsSelected.size(); for (int i =0 ; i < lens; i++) { PreferCustomizableChannel customizableChannel = channelsSelected.get(i); if (customizableChannel.isSelected()) { Log.i("RecyclerViewActivity", "onClick: "+customizableChannel.toString()); } } } }); } private void initData() { Resources resources = getResources(); TypedArray array = resources.obtainTypedArray(R.array.prefer_channel_icon); int len = array.length(); String[] name = resources.getStringArray(R.array.prefer_channel_name); for (int i = 0; i < len; i++) { PreferCustomizableChannel customizableChannel = new PreferCustomizableChannel(); customizableChannel.setChannel(name[i]); customizableChannel.setResId(array.getResourceId(i, 0)); customizableChannel.setSelected(false); customizableChannel.setId(i * 100); channels.add(customizableChannel); } array.recycle(); channelsSelected = channels; } private void initUI() { recycler = (RecyclerView) findViewById(R.id.recycler); final GridLayoutManager manager = new GridLayoutManager(this, 3); recycler.setLayoutManager(manager); recycler.setHasFixedSize(true); recycler.setItemAnimator(new DefaultItemAnimator()); mAdapter = new RecyclerAdapter(RecyclerViewActivity.this, channels); recycler.setAdapter(mAdapter); mAdapter.setClickListener(new OnRecyclerViewItemClickListener() { @Override public void onItemClick(View view, int position) { SparseBooleanArray selecteds = mAdapter.getSelectedItem(); int len = channels.size(); for (int i = 0; i < len; i++) { if (selecteds.get(i)) { channelsSelected.get(position).setSelected(true); } } } }); } }
布局文件RecyclerView横竖都是“match_parent”,否则在点击的时候gridView会自动上滑一段距离。
适配器的实现:
import android.support.v7.widget.RecyclerView; import android.util.SparseBooleanArray; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.RelativeLayout; import android.widget.TextView; import com.entity.PreferCustomizableChannel; import com.listener.OnRecyclerItemClickListener; import java.util.List; import butterknife.BindView; import butterknife.ButterKnife; public class PreferChannelAdapter extends RecyclerView.Adapter{ private List lists; private OnRecyclerItemClickListener listener; private SparseBooleanArray selectLists = new SparseBooleanArray(); public PreferChannelAdapter() { } public void setDatas(List lists) { this.lists = lists; notifyDataSetChanged(); } public void setOnItemClickListener(OnRecyclerItemClickListener listener) { this.listener = listener; } @Override public PreferChannelHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.prefer_channel_item, null); return new PreferChannelHolder(view); } @Override public void onBindViewHolder(final PreferChannelHolder holder, final int position) { PreferCustomizableChannel channelItem = lists.get(position); holder.channelItemTV.setText(channelItem.getChannel()); holder.channelItemImg.setImageResource(channelItem.getResId()); if (!selectLists.get(position)) { holder.selectedMarkImg.setVisibility(View.GONE); } else { holder.selectedMarkImg.setVisibility(View.VISIBLE); } holder.preferChannelItemLayout.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (holder.selectedMarkImg.getVisibility() == View.GONE) { holder.selectedMarkImg.setVisibility(View.VISIBLE); selectLists.put(position, true); } else if (holder.selectedMarkImg.getVisibility() == View.VISIBLE){ holder.selectedMarkImg.setVisibility(View.GONE); selectLists.put(position, false); } listener.onRecyclerClick(position); } }); } @Override public int getItemCount() { return lists.size(); } public class PreferChannelHolder extends RecyclerView.ViewHolder { @BindView(R.id.preferChannelItemLayout) RelativeLayout preferChannelItemLayout; @BindView(R.id.channelItemTV) TextView channelItemTV; @BindView(R.id.channelItemImg) ImageView channelItemImg; @BindView(R.id.selectedMarkImg) ImageView selectedMarkImg; public PreferChannelHolder(View itemView) { super(itemView); ButterKnife.bind(this, itemView); } } public SparseBooleanArray getSelectedItem() { return selectLists; } }
顺便把item的布局也贴出来吧:
<?xml version="1.0" encoding="utf-8"?>
其他注意的地方:
SpareBooleanArrary.size()返回的是已经设置为true的长度,比如选择了一个则返回1,选择了10则返回10,但在选择了10后去掉一个的时候,size()返回的并不是9,而依然是10,这点注意,所以在遍历的时候并没有使用使用size()取长度。
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