RecyclerView和购物车的选择模式

首先是导入依赖
compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'

然后是布局
<android.support.v7.widget.RecyclerView
android:id="@+id/rv"
android:layout_width="match_parent"
android:layout_height="match_parent"></android.support.v7.widget.RecyclerView>

<RelativeLayout
android:id="@+id/rl"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:background="@android:color/white"
android:gravity="center_vertical">

<CheckBox
android:id="@+id/checkbox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="6dp"
android:button="@drawable/select_checkbox" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="6dp"
android:layout_toRightOf="@+id/checkbox"
android:text="全选"
android:textSize="20sp" />
</RelativeLayout>-----------------------------------------------------------------------------------------------------------------------
主页
public class MainActivity extends AppCompatActivity {
private MyAdapter adapter;
private RecyclerView mRv;
private CheckBox mCheckbox;
private RelativeLayout mRl;
private RelativeLayout mLinear;
private String url = "http://result.eolinker.com/iYXEPGn4e9c6dafce6e5cdd23287d2bb136ee7e9194d3e9?uri=one";
/**
* Hello World!
*/

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

initView();
//添加成布局,这个是listview的布局
mRv.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));
//请求数据
x.http().get(new RequestParams(url), new Callback.CommonCallback<String>() {

@Override
public void onSuccess(String result) {
Bean bean = new Gson().fromJson(result, Bean.class);
adapter = new MyAdapter(MainActivity.this,bean.getData());
mRv.setAdapter(adapter);
}

@Override
public void onError(Throwable ex, boolean isOnCallback) {

}

@Override
public void onCancelled(CancelledException cex) {

}

@Override
public void onFinished() {

}
});

}

private void initView() {
mRv = (RecyclerView) findViewById(R.id.rv);
mCheckbox = (CheckBox) findViewById(R.id.checkbox);
mRl = (RelativeLayout) findViewById(R.id.rl);

mCheckbox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//判断点击状态
if (mCheckbox.isChecked()){
mCheckbox.setChecked(true);
adapter.selectedAll();
}else{
mCheckbox.setChecked(false);
adapter.cancleAll();
}

}
});

}
//用来在适配器中调用更改状态
public void setCb(boolean bool) {
mCheckbox.setChecked(bool);
}
}

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
然后是适配器
public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context context;
private List<Bean.DataBean> list;
private final MainActivity ac;

public MyAdapter(Context context, List<Bean.DataBean> list) {
this.context = context;
this.list = list;
ac = (MainActivity) context;
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
//找到条目布局
View view = LayoutInflater.from(context).inflate(R.layout.item, parent, false);
RecyclerView.ViewHolder holder = new MyViewHolder(view);
return holder;
}

@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
final Bean.DataBean dataBean = list.get(position);
//找到控件
if (holder instanceof MyViewHolder) {
((MyViewHolder) holder).cb.setChecked(dataBean.isChecked());
((MyViewHolder) holder).iv.setBackgroundResource(R.mipmap.ic_launcher);
((MyViewHolder) holder).tv.setText(dataBean.getTitle());

((MyViewHolder) holder).cb.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//先判断是否选中
Bean.DataBean currentDataBean = list.get(position);
boolean currentChecked = currentDataBean.isChecked();
currentDataBean.setChecked(!currentChecked);
notifyDataSetChanged();

if (((MyViewHolder) holder).cb.isChecked()) {
//去判断其它按钮是否都选中
ac.setCb(isAllChecked());

} else {
//如果点击的按钮取消掉，即未选中状态，则去判断全选按钮是否是选中状态，如果是则取消选中
ac.setCb(false);
}
}
});
}
}

//用来判断点击状态
private boolean isAllChecked() {
for (int i = 0; i < list.size(); i++) {
Bean.DataBean dataBeans = list.get(i);
if (!dataBeans.isChecked()) {
return false;
}
}
return true;
}

@Override
public int getItemCount() {
return list.size();
}
//viewhodler优化类
private class MyViewHolder extends RecyclerView.ViewHolder {
private CheckBox cb;
private ImageView iv;
private TextView tv;

public MyViewHolder(View itemView) {
super(itemView);
cb = itemView.findViewById(R.id.checkbox);
iv = itemView.findViewById(R.id.imageview);
tv = itemView.findViewById(R.id.tv);
}
}

//更改为全部选中
public void selectedAll() {
for (int i = 0; i < list.size(); i++) {
Bean.DataBean dataBean = list.get(i);
dataBean.setChecked(true);
}
notifyDataSetChanged();
}

//更改为全都未选中
public void cancleAll() {
for (int i = 0; i < list.size(); i++) {
Bean.DataBean dataBean = list.get(i);
dataBean.setChecked(false);
}
notifyDataSetChanged();
}
}

xutils请求数据需要写一个app类，然后在注册列表里注册