由於listview的一些特性，剛開始寫這種需求的功能的時候都會碰到一些問題，重點就是存儲每個checkbox的狀態值，在這裏分享出了完美解決方法：
佈局文件：
<?xml
version="1.0" encoding="utf-8"?>
<RelativeLayout 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/tv"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical" />
<LinearLayout
android:id="@+id/line"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:layout_below="@+id/tv"
android:orientation="horizontal" >
<Button
android:id="@+id/bt_selectall"
android:layout_width="80dp"
android:layout_height="fill_parent"
android:text="全選" />
<Button
android:id="@+id/bt_cancleselectall"
android:layout_width="80dp"
android:layout_height="fill_parent"
android:text="反選" />
<Button
android:id="@+id/bt_deselectall"
android:layout_width="80dp"
android:layout_height="fill_parent"
android:text="取消選擇" />
</LinearLayout>
<ListView
android:id="@+id/lv"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@+id/line" />
</RelativeLayout>
listView 的item佈局文件：
<?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_tv"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
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>
Activity:
public class Ex_checkboxActivity extends Activity {
private ListView lv;
private MyAdapter mAdapter;
private ArrayList<String> list;
private Button bt_selectall;
private Button bt_cancel;
private Button bt_deselectall;
private int checkNum; // 記錄選中的條目數量
private TextView tv_show;// 用於顯示選中的條目數量
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
/* 實例化各個控件 */
lv = (ListView) findViewById(R.id.lv);
bt_selectall = (Button) findViewById(R.id.bt_selectall);
bt_cancel = (Button) findViewById(R.id.bt_cancelselectall);
bt_deselectall = (Button) findViewById(R.id.bt_deselectall);
tv_show = (TextView) findViewById(R.id.tv);
list = new ArrayList<String>();
// 爲Adapter準備數據
initDate();
// 實例化自定義的MyAdapter
mAdapter = new MyAdapter(list, this);
// 綁定Adapter
lv.setAdapter(mAdapter);
// 全選按鈕的回調接口
bt_selectall.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// 遍歷list的長度，將MyAdapter中的map值全部設爲true
for (int i = 0; i < list.size(); i++) {
MyAdapter.getIsSelected().put(i, true);
}
// 數量設爲list的長度
checkNum = list.size();
// 刷新listview和TextView的顯示
dataChanged();
}
});
// 反選按鈕的回調接口
bt_cancel.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// 遍歷list的長度，將已選的設爲未選，未選的設爲已選
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的顯示
dataChanged();
}
});
// 取消按鈕的回調接口
bt_deselectall.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// 遍歷list的長度，將已選的按鈕設爲未選
for (int i = 0; i < list.size(); i++) {
if (MyAdapter.getIsSelected().get(i)) {
MyAdapter.getIsSelected().put(i, false);
checkNum--;// 數量減1
}
}
// 刷新listview和TextView的顯示
dataChanged();
}
});
// 綁定listView的監聽器
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// 取得ViewHolder對象，這樣就省去了通過層層的findViewById去實例化我們需要的cb實例的步驟
ViewHolder holder = (ViewHolder) arg1.getTag();
// 改變CheckBox的狀態
holder.cb.toggle();
// 將CheckBox的選中狀況記錄下來
MyAdapter.getIsSelected().put(arg2, holder.cb.isChecked());
// 調整選定條目
if (holder.cb.isChecked() == true) {
checkNum++;
} else {
checkNum--;
}
// 用TextView顯示
tv_show.setText("已選中" + checkNum + "項");
}
});
}
// 初始化數據
private void initDate() {
for (int i = 0; i < 15; i++) {
list.add("data" + " " + i);
}
;
}
// 刷新listview和TextView的顯示
private void dataChanged() {
// 通知listView刷新
mAdapter.notifyDataSetChanged();
// TextView顯示最新的選中數目
tv_show.setText("已選中" + checkNum + "項");
};
}
列表適配器：
package
com.notice.listcheck;
import java.util.ArrayList;
import java.util.HashMap;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.TextView;
public class MyAdapter extends BaseAdapter {
// 填充數據的list
private ArrayList<String> list;
// 用來控制CheckBox的選中狀況
private static HashMap<Integer, Boolean> isSelected;
// 上下文
private Context context;
// 用來導入佈局
private LayoutInflater inflater = null;
// 構造器
public MyAdapter(ArrayList<String> list, Context context) {
this.context = context;
this.list = list;
inflater = LayoutInflater.from(context);
isSelected = new HashMap<Integer, Boolean>();
// 初始化數據
initDate();
}
// 初始化isSelected的數據
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(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
// 獲得ViewHolder對象
holder = new ViewHolder();
// 導入佈局並賦值給convertview
convertView = inflater.inflate(R.layout.listviewitem, null);
holder.tv = (TextView) convertView.findViewById(R.id.item_tv);
holder.cb = (CheckBox) convertView.findViewById(R.id.item_cb);
// 爲view設置標籤
convertView.setTag(holder);
} else {
// 取出holder
holder = (ViewHolder) convertView.getTag();
}
// 設置list中TextView的顯示
holder.tv.setText(list.get(position));
// 根據isSelected來設置checkbox的選中狀況
holder.cb.setChecked(getIsSelected().get(position));
return convertView;
}
public static HashMap<Integer, Boolean> getIsSelected() {
return isSelected;
}
public static void setIsSelected(HashMap<Integer, Boolean> isSelected) {
MyAdapter.isSelected = isSelected;
}
public static class ViewHolder {
TextView tv;
CheckBox cb;
}
}