我有一个适配器用于在聊天应用程序中的列表视图相似的消息上显示消息.创建活动后,我能够完美地显示内容,但是当我返回并再次创建活动时,适配器不能像往常一样工作.
我在调试中发现的是：
>函数receive()在收到消息时被调用并更新
注册,如上所述,显示没有问题
创建活动后列表视图中的数据,但一旦我返回
并重新启动我无法显示已接收消息的活动.
onSesume()OnPause或onStart()方法中是否存在关于自定义适配器(例如再次注册或重新定制自定义适配器)的问题？感谢帮助.
以下是我的活动类的代码,它使用自定义适配器显示已发送和已接收的消息：
public class hotListener extends ListActivity {
private XMPPConnection connection;
private IBinder binder;
private Handler mHandler = new Handler();
private ArrayList<String> messages = new ArrayList<String>();
ArrayList<ChatMessage> messagex= new ArrayList<ChatMessage>();;
ChattingAdapter adaptex;
Intent mIntent ;
private ListView listview;
EditText sender_message ;
String msg;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listener);
//messagex.add(new ChatMessage("Hello", false));
adaptex = new ChattingAdapter(getApplicationContext(),messagex);
setlistadapter(adaptex);
Button send_button = (Button) findViewById(R.id.chat_send_message);
sender_message = (EditText) findViewById(R.id.chat_input);
send_button.setonClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
msg = sender_message.getText().toString();
sender_message.setText("");
if(!(msg.length()==0)){
messagex.add(new ChatMessage(msg, true));
//addNewMessage(new ChatMessage(msg, true));
adaptex.notifyDataSetChanged();
getListView().setSelection(messagex.size()-1);
}
}
});
if(!isMyServiceRunning()){
System.out.println("seems like service not running");
startService(new Intent(this,xService.class));
System.out.print(" Now started ");
}
}
@Override
protected void onStart(){
super.onStart();
Boolean kuch = bindService(new Intent(this,xService.class), mConnection,Context.BIND_AUTO_CREATE);
//System.out.println(kuch);
System.out.println("bind done");
}
private void receives(XMPPConnection connection2) {
//ChatManager chatmanager = connection.getChatManager();
connection2.getChatManager().addChatListener(new ChatManagerListener() {
@Override
public void chatCreated(Chat arg0, boolean arg1) {
arg0.addMessageListener(new MessageListener() {
@Override
public void processMessage(Chat chat, Message message) {
final String from = message.getFrom();
final String body = message.getBody();
mHandler.post(new Runnable() {
ChatMessage kudi = new ChatMessage(body, false);
@Override
public void run() {
messagex.add(kudi);
adaptex.notifyDataSetChanged();
getListView().setSelection(messagex.size()-1);
Toast.makeText(hotListener.this,body,Toast.LENGTH_SHORT).show(); }
});
}
});
}
});
}
private boolean isMyServiceRunning() {
ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
for(RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)){
if(xService.class.getName().equals(service.service.getClassName())){
return true;
}
}
//System.out.print("false");
return false;
}
@Override
protected void onResume() {
bindService(new Intent(this, xService.class), mConnection, Context.BIND_AUTO_CREATE);
super.onResume();
}
@Override
protected void onPause() {
unbindService(mConnection);
super.onPause();
}
private ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServicedisconnected(ComponentName name) {
connection = null;
service = null;
}
@Override
public void onServiceConnected(ComponentName name, IBinder binder) {
//System.out.println("binding in hot listener");
service = ((xService.mybinder)binder).getService();
connection = service.getConnection();
receives(connection);
Log.wtf("Service","connected");
}
};
void addNewMessage(ChatMessage m)
{
System.out.println("1");
messagex.add(m);
System.out.println("2");
adaptex.notifyDataSetChanged();
System.out.println("3");
getListView().setSelection(messagex.size()-1);
}
}
这是我的自定义适配器(自定义适配器没有问题,但添加以使事情清楚)：
public class ChattingAdapter extends BaseAdapter{
private Context mContext;
private ArrayList<ChatMessage> mMessages;
public ChattingAdapter(Context context, ArrayList<ChatMessage> messages) {
super();
this.mContext = context;
this.mMessages = messages;
}
@Override
public int getCount() {
return mMessages.size();
}
@Override
public Object getItem(int position) {
return mMessages.get(position);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ChatMessage message = (ChatMessage) this.getItem(position);
ViewHolder holder;
if(convertView == null)
{
holder = new ViewHolder();
convertView = LayoutInflater.from(mContext).inflate(R.layout.listitem, parent, false);
holder.message = (TextView) convertView.findViewById(R.id.text1);
convertView.setTag(holder);
}
else
holder = (ViewHolder) convertView.getTag();
holder.message.setText(message.getMessage());
LayoutParams lp = (LayoutParams) holder.message.getLayoutParams();
//Check whether message is mine to show green background and align to right
if(message.ismine())
{ holder.message.setBackgroundResource(R.drawable.msgBox_new_selected_go_up);
lp.gravity = Gravity.RIGHT;
}
//If not mine then it is from sender to show orange background and align to left
else
{
holder.message.setBackgroundResource(R.drawable.msgBox_other_go_up);
lp.gravity = Gravity.LEFT;
}
holder.message.setLayoutParams(lp);
//holder.message.setTextColor(R.color.textColor);
return convertView;
}
private static class ViewHolder
{
TextView message;
}
@Override
public long getItemId(int position) {
//Unimplemented, because we aren't using sqlite.
return position;
}
}
p.s：我没有在sqlite中存储任何消息,因为我现在不想恢复消息,但我希望新消息至少显示在一些激活状态.我可以在按下发送按钮后显示已发送的消息,但没有收到的消息在第一次创建活动时工作正常.
编辑：我做了更多的调试,事实证明问题不在于恢复活动,如果我第一次不使用receive()函数,并在返回后恢复活动,那么receive()将工作,这意味着,函数内部接收( )：getListView().setSelection(messagex.size() – 1);只工作一次.
第一次接收消息或下次时,当且仅当第一次没有呼叫活动时.
解决方法:
我认为问题在于当您尝试恢复活动时,您仍在运行以前的mHandler运行,因此您的消息实例不会被销毁,当您恢复活动时会产生问题.确保在调用unstop时,mhandler会销毁所有对象实例.
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