<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="/apk/res/android" xmlns:tools="/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".luzhiwei0321.MainActivity"><RelativeLayout android:id="@+id/line1" android:layout_width="match_parent" android:layout_height="50dp" android:layout_alignParentTop="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true"> <Button android:id="@+id/bt_selectall" android:layout_width="80dp" android:layout_height="fill_parent" android:text="全选" /> <Button android:id="@+id/bt_cancleselectall" android:layout_width="80dp" android:layout_height="fill_parent" android:text="反选" android:layout_alignParentTop="true" android:layout_alignParentRight="true" android:layout_alignParentEnd="true" /></RelativeLayout> <ListView android:id="@+id/rl" android:layout_below="@id/line1" android:layout_width="match_parent" android:layout_height="match_parent" android:divider="#000" android:dividerHeight="1px"/></RelativeLayout>
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/item_tv" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:paddingLeft="20dp" android:textSize="20sp" android:layout_weight="1" /> <CheckBox android:id="@+id/item_cb" android:layout_width="wrap_content" android:layout_height="wrap_content" android:clickable="false" android:focusable="false" android:focusableInTouchMode="false" android:gravity="center_vertical" /></LinearLayout>
public class MainActivity extends AppCompatActivity {private Button bt_selectall; private Button bt_cancleselectall;// private RecyclerView rl; private ArrayList<String> list; private MyAdapter adapter; private ListView rl; private int checkNum; // 记录选中的条目数量 @Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); bt_selectall = (Button) findViewById(R.id.bt_selectall); bt_cancleselectall = (Button) findViewById(R.id.bt_cancleselectall); // rl = (RecyclerView) findViewById(R.id.rl); rl = (ListView) findViewById(R.id.rl); list = new ArrayList<>(); initData(); adapter = new MyAdapter(list,MainActivity.this); rl.setAdapter(adapter); // 全选按钮的回调接口 bt_selectall.setOnClickListener(new View.OnClickListener() {@Override public void onClick(View v) {// 遍历list的长度，将MyAdapter中的map值全部设为truefor (int i = 0; i < list.size(); i++) {MyAdapter.getIsSelected().put(i, true);}// 数量设为list的长度checkNum = list.size();// 刷新listview和TextView的显示dataChanged(); }}); // 反选按钮的回调接口 bt_cancleselectall.setOnClickListener(new View.OnClickListener() {@Override public void onClick(View v) {// 遍历list的长度，将已选的设为未选，未选的设为已选for (int i = 0; i < list.size(); i++) {if (MyAdapter.getIsSelected().get(i)) {MyAdapter.getIsSelected().put(i, false); checkNum--;} else {MyAdapter.getIsSelected().put(i, true); checkNum++;}}// 刷新listview和TextView的显示dataChanged(); }}); // 绑定listView的监听器 rl.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {// 取得ViewHolder对象，这样就省去了通过层层的findViewById去实例化我们需要的cb实例的步骤MyAdapter.ViewHolder holder = (MyAdapter.ViewHolder) arg1.getTag();// 改变CheckBox的状态holder.cb.toggle();// 将CheckBox的选中状况记录下来MyAdapter.getIsSelected().put(arg2, holder.cb.isChecked());// 调整选定条目if (holder.cb.isChecked() == true) {checkNum++;} else {checkNum--;}}}); }private void initData() {for (int i = 0; i < 100; i++) {list.add(i+""); }}// 刷新listview和TextView的显示 private void dataChanged() {// 通知listView刷新 adapter.notifyDataSetChanged(); }}
/*** Created by lenovo on /3/21.*/public class MyAdapter extends BaseAdapter {// 填充数据的list private ArrayList<String> list; // 用来控制CheckBox的选中状况 private static HashMap<Integer, Boolean>isSelected; // 上下文 private Context context; // 用来导入布局 private LayoutInflater inflater = null; // 构造器 public MyAdapter(ArrayList<String> list, Context context) {this.context = context; this.list = list; inflater = LayoutInflater.from(context); isSelected= new HashMap<Integer, Boolean>(); // 初始化数据 initDate(); }// 初始化isSelected的数据 private void initDate() {for (int i = 0; i < list.size(); i++) {getIsSelected().put(i, false); }}@Override public int getCount() {return list.size(); }@Override public Object getItem(int i) {return list.get(i); }@Override public long getItemId(int i) {return i; }@Override public View getView(final int i, View view, ViewGroup viewGroup) {ViewHolder holder = null; if (view == null) {// 获得ViewHolder对象 holder = new ViewHolder(); // 导入布局并赋值给convertview view = inflater.inflate(R.layout.item, null); holder.tv = (TextView) view.findViewById(R.id.item_tv); holder.cb = (CheckBox) view.findViewById(R.id.item_cb); // 为view设置标签 view.setTag(holder); } else {// 取出holder holder = (ViewHolder) view.getTag(); }// 设置list中TextView的显示 holder.tv.setText(list.get(i)); // 根据isSelected来设置checkbox的选中状况 holder.cb.setChecked(getIsSelected().get(i)); holder.tv.setOnClickListener(new View.OnClickListener() {@Override public void onClick(View view) {Toast.makeText(context,""+list.get(i),Toast.LENGTH_SHORT).show(); }}); return view; }public static HashMap<Integer, Boolean> getIsSelected() {returnisSelected; }public static void setIsSelected(HashMap<Integer, Boolean> isSelected) {MyAdapter.isSelected= isSelected; }public static class ViewHolder {TextView tv; CheckBox cb; }}
