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;
}
}
需要留意的是 用来保存选择状态
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>
这样，关于GridView中Checkbox全选的功能就算完成了。
