RecycleView的全选和反选

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效果实现：点击全选，chechBox里的全都选上，点击反选，全都呈现未选中状态。

1.activity_xml中代码：

<LinearLayout    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:orientation="horizontal">    <Button        android:id="@+id/all"        android:layout_width="0dp"        android:layout_height="wrap_content"        android:layout_weight="1"        android:text="全选" />    <Button        android:id="@+id/fan"        android:layout_width="0dp"        android:layout_height="wrap_content"        android:layout_weight="1"        android:text="反选" /></LinearLayout>    <android.support.v7.widget.RecyclerView        android:id="@+id/rv"        android:layout_width="match_parent"        android:layout_height="match_parent">    </android.support.v7.widget.RecyclerView>2.item中的代码<LinearLayout    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:orientation="horizontal">    <TextView        android:id="@+id/text_item"        android:layout_width="300dp"        android:layout_height="wrap_content"        />    <CheckBox        android:id="@+id/mCheckBox"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></LinearLayout><View    android:id="@+id/v"    android:layout_width="match_parent"    android:layout_height="3dp"    android:background="#C0C0C0" />

3.Mainactivity中的代码：

public class MainActivity extends AppCompatActivity implements View.OnClickListener {    private Button all;    private Button fan;    private RecyclerView rv;    private ArrayList<Bean> arr;    private LinearLayoutManager linearLayoutManager;    private MyRecycleVAdapter myadapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        initData();    }    private void initData() {        arr = new ArrayList<>();        for (int i = 0; i < 100; i++) {            Bean bean = new Bean(i + "", false);            arr.add(bean);        }        linearLayoutManager = new LinearLayoutManager(this);        rv.setLayoutManager(linearLayoutManager);//        rv.addItemDecoration(new drawline());        //设置数据        if (myadapter == null) {            myadapter = new MyRecycleVAdapter(arr, MainActivity.this);            rv.setAdapter(myadapter);        } else {            myadapter.notifyDataSetChanged();        }        this.myadapter.setData(arr);    }    private void initView() {        all = (Button) findViewById(R.id.all);        fan = (Button) findViewById(R.id.fan);        rv = (RecyclerView) findViewById(R.id.rv);        all.setOnClickListener(this);        fan.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.all:                myadapter.setELL();                break;            //反选            case R.id.fan:                myadapter.setfalse();                break;        }    }

4.Myadapter中的代码：

public class MyRecycleVAdapter extends RecyclerView.Adapter<MyRecycleVAdapter.MyViewHoder> {    private ArrayList<Bean> list = new ArrayList<>();    private Context context;    public MyRecycleVAdapter(ArrayList<Bean> list, Context context) {        this.list = list;        this.context = context;    }    @Override    public MyViewHoder onCreateViewHolder(ViewGroup parent, int viewType) {        View inflate = View.inflate(context, R.layout.item, null);        MyViewHoder myViewHoder = new MyViewHoder(inflate);        return myViewHoder;    }    @Override    public void onBindViewHolder(final MyViewHoder holder, final int position) {        holder.text_item.setText(list.get(position).getStr());        holder.mCheckBox.setChecked(list.get(position).istrue());        holder.text_item.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Toast.makeText(context, "" + list.get(position).toString(), Toast.LENGTH_SHORT).show();            }        });        holder.text_item.setOnLongClickListener(new View.OnLongClickListener() {            @Override            public boolean onLongClick(View v) {                AlertDialog.Builder builder = new AlertDialog.Builder(context);                builder.setMessage("长按" + position);                builder.show();                return false;            }        });    }    @Override    public int getItemCount() {        return list.size();    }    public void setData(ArrayList<Bean> arr) {        if (arr != null) {            list.addAll(arr);        }    }    public void setELL() {        for (int i = 0; i < list.size(); i++) {            Bean bean = list.get(i);            bean.setIstrue(true);        }        notifyDataSetChanged();    }    public void setfalse() {        for (int i = 0; i < list.size(); i++) {            Bean bean = list.get(i);            bean.setIstrue(false);        }        notifyDataSetChanged();    }    class MyViewHoder extends RecyclerView.ViewHolder {        private final TextView text_item;        private final CheckBox mCheckBox;        private final View viewById;        public MyViewHoder(View itemView) {            super(itemView);            text_item = (TextView) itemView.findViewById(R.id.text_item);            mCheckBox = (CheckBox) itemView.findViewById(R.id.mCheckBox);            viewById = itemView.findViewById(R.id.v);        }    }}

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