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 List channels = 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。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持创新互联。
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