全选效果图
这节讲得相对比较基础的东西，高手请忽略。
首先新建一个GridviewAdapter继承BaseAdapter
public class GridviewAdapter extends BaseAdapter{ private ArrayList<Person> list; private static HashMap<Integer,Boolean> isSelected; private Context context; private LayoutInflater inflater = null; public GridviewAdapter(ArrayList<Person> list, Context context) { this.context = context; this.list = list; inflater = LayoutInflater.from(context); isSelected = new HashMap<Integer, Boolean>(); initDate(); } 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 position) { return list.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(final int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if (convertView == null) { holder = new ViewHolder(); convertView = inflater.inflate(R.layout.gridviewitem, null); holder.name = (TextView) convertView.findViewById(R.id.item_name); holder.ID = (TextView) convertView.findViewById(R.id.item_ID); holder.cb = (CheckBox) convertView.findViewById(R.id.item_cb); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } holder.ID.setText(list.get(position).getId()); holder.name.setText(list.get(position).getName()); holder.cb.setChecked(getIsSelected().get(position)); return convertView; } static class ViewHolder{ CheckBox cb; TextView name; TextView ID; } public static HashMap<Integer,Boolean> getIsSelected() { return isSelected; } public static void setIsSelected(HashMap<Integer,Boolean> isSelected) { GridviewAdapter.isSelected = isSelected; } }
下面我们新建一个Activity来看看效果：
public class MainActivity extends Activity implements OnClickListener { private GridView gd; private GridviewAdapter mAdapter; private ArrayList<Person> persons; private Button bt_selectall; private Button bt_cancel; private Button bt_deselectall; private Button bt_sumit; private int checkNum; // 记录选中的条目数量 private TextView tv_show;// 用于显示选中的条目数量 List<String> selectID = new ArrayList<String>(); //选中的ID @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); initData(); gd.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { ViewHolder holder = (ViewHolder) arg1.getTag(); holder.cb.toggle(); GridviewAdapter.getIsSelected().put(arg2, holder.cb.isChecked()); if (holder.cb.isChecked() == true) { checkNum++; } else { checkNum--; } tv_show.setText("已选中" + checkNum + "项"); } }); } /** * 初始化数据 */ private void initData() { Person mPerson; for (int i = 1; i <= 40; i++) { mPerson = new Person(); mPerson.setName("aikaifa" + i); // mPerson.setId(Character.valueOf((char)(i+65))+" "); mPerson.setId(i + ""); persons.add(mPerson); } mAdapter = new GridviewAdapter(persons, this); gd.setAdapter(mAdapter); } /** * 刷新 */ private void dataChanged() { mAdapter.notifyDataSetChanged(); tv_show.setText("已选中" + checkNum + "项"); } /** * 初始化控件 */ private void initView() { gd = (GridView) findViewById(R.id.gd); bt_selectall = (Button) findViewById(R.id.bt_selectall); bt_cancel = (Button) findViewById(R.id.bt_cancelselectall); bt_deselectall = (Button) findViewById(R.id.bt_deselectall); bt_sumit = (Button) findViewById(R.id.bt_submit); tv_show = (TextView) findViewById(R.id.tv); persons = new ArrayList<Person>(); bt_selectall.setOnClickListener(this); bt_cancel.setOnClickListener(this); bt_deselectall.setOnClickListener(this); bt_sumit.setOnClickListener(this); } /** * 全选 */ private void selectAll() { for (int i = 0; i < persons.size(); i++) { GridviewAdapter.getIsSelected().put(i, true); } // 数量设为list的长度 checkNum = persons.size(); dataChanged(); } /** * 全不选 */ private void cancelselectall() { // 遍历list的长度，将已选的按钮设为未选 for (int i = 0; i < persons.size(); i++) { if (GridviewAdapter.getIsSelected().get(i)) { GridviewAdapter.getIsSelected().put(i, false); checkNum--;// 数量减1 } } dataChanged(); } /** * 反选 */ private void deselectall() { // 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 < persons.size(); i++) { if (GridviewAdapter.getIsSelected().get(i)) { GridviewAdapter.getIsSelected().put(i, false); checkNum--; } else { GridviewAdapter.getIsSelected().put(i, true); checkNum++; } } dataChanged(); } /** * 提交 */ private void submit() { selectID.clear(); for (int i = 0; i < mAdapter.getIsSelected().size(); i++) { if (mAdapter.getIsSelected().get(i)) { selectID.add(persons.get(i).getId()); } } if (selectID.size() == 0) { AlertDialog.Builder builder1 = new AlertDialog.Builder( MainActivity.this); builder1.setMessage("没有选中任何记录"); builder1.show(); } else { StringBuilder sb = new StringBuilder(); for (int i = 0; i < selectID.size(); i++) { sb.append("ID=" + selectID.get(i) + " "); } AlertDialog.Builder builder2 = new AlertDialog.Builder(MainActivity.this); builder2.setMessage(sb.toString()); builder2.show(); } } @Override public void onClick(View v) { switch (v.getId()) { case R.id.bt_selectall: selectAll(); break; case R.id.bt_cancelselectall: cancelselectall(); break; case R.id.bt_deselectall: deselectall(); break; case R.id.bt_submit: submit(); break; } } }
对应的activity_main.xml布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/LinearLayout1" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <Button android:id="@+id/bt_selectall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="全选" /> <Button android:id="@+id/bt_cancelselectall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="全不选" /> <Button android:id="@+id/bt_deselectall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="反选" /> <Button android:id="@+id/bt_submit" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="提交" /> </LinearLayout> <TextView android:id="@+id/tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="TextView" /> <GridView android:id="@+id/gd" android:layout_width="fill_parent" android:layout_height="fill_parent" android:numColumns="2" /> </LinearLayout>
其中有个实体类
public class Person { private String name; private String Id; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getId() { return Id; } public void setId(String id) { Id = id; } }
gridviewitem.xml布局
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal" > <TextView android:id="@+id/item_ID" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center_vertical" android:visibility="gone" /> <TextView android:id="@+id/item_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center_vertical" /> <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>
