全選效果圖

這節講得相對比較基礎的東西，高手請忽略。

首先新建一個GridviewAdapter繼承BaseAdapter

public class GridviewAdapter extends BaseAdapter{

private ArrayList list;

private static HashMap isSelected;

private Context context;

private LayoutInflater inflater = null;

public GridviewAdapter(ArrayList list, Context context) {

this.context = context;

this.list = list;

inflater = LayoutInflater.from(context);

isSelected = new HashMap();

initDate();

}

private void initDate(){

for(int i=0; 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 getIsSelected() {

return isSelected;

}

public static void setIsSelected(HashMap isSelected) {

GridviewAdapter.isSelected = isSelected;

}

}

需要留意的是 用來保存選擇狀態

public static HashMap getIsSelected() {

return isSelected;

}

public static void setIsSelected(HashMap isSelected) {

GridviewAdapter.isSelected = isSelected;

}

下面我們新建一個Activity來看看效果：

public class MainActivity extends Activity implements OnClickListener {

private GridView gd;

private GridviewAdapter mAdapter;

private ArrayList persons;

private Button bt_selectall;

private Button bt_cancel;

private Button bt_deselectall;

private Button bt_sumit;

private int checkNum; // 記錄選中的條目數量

private TextView tv_show;// 用于顯示選中的條目數量

List selectID = new ArrayList(); //選中的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("已選中" + checkNum + "項");

}

});

}

/**

* 初始化數據

*/

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("已選中" + checkNum + "項");

}

/**

* 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();

bt_selectall.setOnClickListener(this);

bt_cancel.setOnClickListener(this);

bt_deselectall.setOnClickListener(this);

bt_sumit.setOnClickListener(this);

}

/**

* 全選

*/

private void selectAll() {

for (int i = 0; i < persons.size(); i++) {

GridviewAdapter.getIsSelected().put(i, true);

}

// 數量設為list的長度

checkNum = persons.size();

dataChanged();

}

/**

* 全不選

*/

private void cancelselectall() {

// 遍歷list的長度，將已選的按鈕設為未選

for (int i = 0; i < persons.size(); i++) {

if (GridviewAdapter.getIsSelected().get(i)) {

GridviewAdapter.getIsSelected().put(i, false);

checkNum--;// 數量減1

}

}

dataChanged();

}

/**

* 反選

*/

private void deselectall() {

// 遍歷list的長度，將已選的設為未選，未選的設為已選

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("沒有選中任何記錄");

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;

}

}

}

對應的activity_main.xml布局

xmlns:tools="http://schemas.android.com/tools"

android:id="@+id/LinearLayout1"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

>

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="horizontal"

>

android:id="@+id/bt_selectall"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="全選" />

android:id="@+id/bt_cancelselectall"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="全不選" />

android:id="@+id/bt_deselectall"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="反選" />

android:id="@+id/bt_submit"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="提交" />

android:id="@+id/tv"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="TextView" />

android:id="@+id/gd"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:numColumns="2" />

其中有個實體類

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

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="horizontal" >

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" />

android:id="@+id/item_name"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:gravity="center_vertical" />

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" />

這樣，關于GridView中Checkbox全選的功能就算完成了。

總結

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