嗨，在下面的代码中我得到了数组索引超出范围的异常。这是朋友数组，它给出了两个值。
对于前： friendinfo [0] = user1，friendinfo 1 = user2，当我选择user1时选中复选框我要将friend.length显示为2，选中的值应为1.
这是示例屏幕，当我点击创建按钮时，如何添加use3和user1。 的 GroupList.java
public class GroupList extends ListActivity
{
boolean[] checkBoxState;
private IAppManager imService = null;
private FriendListAdapter friendAdapter;
public String ownusername = new String();
private class FriendListAdapter extends BaseAdapter
{
@SuppressWarnings("unused")
class ViewHolder {
TextView text;
ImageView icon;
CheckBox check1;
}
private LayoutInflater mInflater;
private Bitmap mOnlineIcon;
private Bitmap mOfflineIcon;
private FriendInfo[] friends = null;
public FriendListAdapter(Context context) {
super();
mInflater = LayoutInflater.from(context);
mOnlineIcon = BitmapFactory.decodeResource(context.getResources(), R.drawable.greenstar);
mOfflineIcon = BitmapFactory.decodeResource(context.getResources(), R.drawable.redstar);
}
public void setFriendList(FriendInfo[] friends)
{
this.friends = friends;
}
public int getCount() {
return friends.length;
}
public FriendInfo getItem(int position) {
return friends[position];
}
public long getItemId(int position) {
return 0;
}
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null)
{
convertView = mInflater.inflate(R.layout.grouplist, null);
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.text);
holder.icon = (ImageView) convertView.findViewById(R.id.icon);
holder.check1 = (CheckBox) convertView.findViewById(R.id.checkBox1);
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
holder.text.setText(friends[position].userName);
holder.icon.setImageBitmap(friends[position].status == STATUS.ONLINE ? mOnlineIcon : mOfflineIcon);
checkBoxState = new boolean[friends.length];
holder.check1.setChecked(checkBoxState[position]);
holder.check1.setOnCheckedChangeListener(new OnCheckedChangeListener(){
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
checkBoxState[position]=isChecked;
String check=friends[position].userName;
Toast.makeText(getApplicationContext(),friends[position].userName+"checked", Toast.LENGTH_LONG).show();
}
});
return convertView;
}
}
public class MessageReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Log.i("Broadcast receiver ", "received a message");
Bundle extra = intent.getExtras();
if (extra != null)
{
String action = intent.getAction();
if (action.equals(IMService.FRIEND_LIST_UPDATED))
{
GroupList.this.updateData(FriendController.getFriendsInfo(),
FriendController.getUnapprovedFriendsInfo());
}
}
}
};
public MessageReceiver messageReceiver = new MessageReceiver();
private ServiceConnection mConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
imService = ((IMService.IMBinder)service).getService();
FriendInfo[] friends = FriendController.getFriendsInfo();
if (friends != null) {
GroupList.this.updateData(friends, null);
}
String groupname = getIntent().getStringExtra("nick");
setTitle(groupname);
ownusername = imService.getUsername();
}
public void onServiceDisconnected(ComponentName className) {
imService = null;
Toast.makeText(GroupList.this, R.string.local_service_stopped,
Toast.LENGTH_SHORT).show();
}
};
@SuppressLint("NewApi")
@TargetApi(Build.VERSION_CODES.GINGERBREAD)
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
}
setContentView(R.layout.group_list_screen);
friendAdapter = new FriendListAdapter(this);
Button create=(Button)findViewById(R.id.create);
create.setOnClickListener(new OnClickListener() {
@SuppressWarnings("unused")
@Override
public void onClick(View v) {
String groupname = getIntent().getStringExtra("nick");
try {
FriendInfo[] friend=FriendController.getFriendsInfo();
//checkBoxState = new CheckBox[friend.length];
/*try {
for(int i=0;i <=friend.length ;i++){
if(checkBoxState[i].isChecked()){
check[i]="1";
}
}
}catch (Exception e) {
e.printStackTrace();
}*/
String result1 = imService.CreateGroup(groupname,imService.getUsername(),friend);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
Toast.makeText(getApplicationContext(), "Group Created Sucessfully",Toast.LENGTH_LONG).show();
}
});
}
public void updateData(FriendInfo[] friends, FriendInfo[] unApprovedFriends)
{
if (friends != null) {
friendAdapter.setFriendList(friends);
setListAdapter(friendAdapter);
}
if (unApprovedFriends != null)
{
NotificationManager NM = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
if (unApprovedFriends.length > 0)
{
String tmp = new String();
for (int j = 0; j < unApprovedFriends.length; j++) {
tmp = tmp.concat(unApprovedFriends[j].userName).concat(",");
}
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.stat_sample)
.setContentTitle(getText(R.string.new_friend_request_exist));
/*Notification notification = new Notification(R.drawable.stat_sample,
getText(R.string.new_friend_request_exist),
System.currentTimeMillis());*/
Intent i = new Intent(this, UnApprovedFriendList.class);
i.putExtra(FriendInfo.FRIEND_LIST, tmp);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
i, 0);
mBuilder.setContentText("You have new friend request(s)");
mBuilder.setContentIntent(contentIntent);
NM.notify(R.string.new_friend_request_exist, mBuilder.build());
}
else
{
NM.cancel(R.string.new_friend_request_exist);
}
}
}
@Override
protected void onPause()
{
unregisterReceiver(messageReceiver);
unbindService(mConnection);
super.onPause();
}
@Override
protected void onResume()
{
super.onResume();
bindService(new Intent(GroupList.this, IMService.class), mConnection , Context.BIND_AUTO_CREATE);
IntentFilter i = new IntentFilter();
i.addAction(IMService.FRIEND_LIST_UPDATED);
registerReceiver(messageReceiver, i);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
}
答案 0 :(得分：5)
你可能想写：
if(checkBoxState[i]==isChecked)
如果checkBoxState和friend数组具有相同的长度，checkBoxState[friend.length]超出范围，因为数组的索引从0到长度为-1。
另请注意，您的if条件包含赋值运算符=，而不是比较运算符==。
答案 1 :(得分：2)
只需使用for循环中的索引即可。此外，因为isChecked已经是一个布尔值，你可以直接将其分配给checkBoxState
for (int i = 0; i < friend.length; i++) {
checkBoxState[i] = isChecked;
}
答案 2 :(得分：1)
您正尝试访问长度为2（位置0和1）的数组中的索引第2个位置。
所以请更改以下代码，
if(checkBoxState[i]==isChecked)