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채팅 응용 프로그램을 디자인했지만 텍스트를 작성하고 보내기를 클릭하면 응용 프로그램이 강제 종료됩니다. 다른 활동에 사용자 이름, IP 및 포트 정보를 보냅니다.안드로이드 채팅 응용 프로그램을 해결
메시징 코드 :
import java.io.UnsupportedEncodingException;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.NotificationManager;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.database.Cursor;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnKeyListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.android.chat.IAppManager;
import com.android.chat.IMService;
import com.android.chat.FriendController;
import com.android.chat.LocalStorageHandler;
import com.android.chat.FriendInfo;
import com.android.chat.MessageInfo;
import com.android.chats.R;
public class Messaging extends Activity {
private static final int MESSAGE_CANNOT_BE_SENT = 0;
public String username;
private EditText messageText;
private EditText messageHistoryText;
private Button sendMessageButton;
private IAppManager imService;
private FriendInfo friend = new FriendInfo();
private LocalStorageHandler localstoragehandler;
private Cursor dbCursor;
private ServiceConnection mConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
imService = ((IMService.IMBinder)service).getService();
}
public void onServiceDisconnected(ComponentName className) {
imService = null;
Toast.makeText(Messaging.this, R.string.local_service_stopped,
Toast.LENGTH_SHORT).show();
}
};
@Override
protected void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.messaging_screen); //messaging_screen);
messageHistoryText = (EditText) findViewById(R.id.messageHistory);
messageText = (EditText) findViewById(R.id.message);
messageText.requestFocus();
sendMessageButton = (Button) findViewById(R.id.sendMessageButton);
Bundle extras = this.getIntent().getExtras();
friend.userName = extras.getString(FriendInfo.USERNAME);
friend.ip = extras.getString(FriendInfo.IP);
friend.port = extras.getString(FriendInfo.PORT);
String msg = extras.getString(MessageInfo.MESSAGETEXT);
setTitle("Messaging with " + friend.userName);
// EditText friendUserName = (EditText) findViewById(R.id.friendUserName);
// friendUserName.setText(friend.userName);
localstoragehandler = new LocalStorageHandler(this);
dbCursor = localstoragehandler.get(friend.userName, IMService.USERNAME);
if (dbCursor.getCount() > 0){
int noOfScorer = 0;
dbCursor.moveToFirst();
while ((!dbCursor.isAfterLast())&&noOfScorer<dbCursor.getCount())
{
noOfScorer++;
this.appendToMessageHistory(dbCursor.getString(2) , dbCursor.getString(3));
dbCursor.moveToNext();
}
}
localstoragehandler.close();
if (msg != null)
{
this.appendToMessageHistory(friend.userName , msg);
((NotificationManager)getSystemService(NOTIFICATION_SERVICE)).cancel((friend.userName+msg).hashCode());
}
sendMessageButton.setOnClickListener(new OnClickListener(){
CharSequence message;
Handler handler = new Handler();
public void onClick(View arg0) {
message = messageText.getText();
if (message.length()>0)
{
appendToMessageHistory(imService.getUsername(), message.toString());
localstoragehandler.insert(imService.getUsername(), friend.userName, message.toString());
messageText.setText("");
Thread thread = new Thread(){
public void run() {
try {
if (imService.sendMessage(imService.getUsername(), friend.userName, message.toString()) == null)
{
handler.post(new Runnable(){
public void run() {
Toast.makeText(getApplicationContext(),R.string.message_cannot_be_sent, Toast.LENGTH_LONG).show();
//showDialog(MESSAGE_CANNOT_BE_SENT);
}
});
}
} catch (UnsupportedEncodingException e) {
Toast.makeText(getApplicationContext(),R.string.message_cannot_be_sent, Toast.LENGTH_LONG).show();
e.printStackTrace();
}
}
};
thread.start();
}
}});
messageText.setOnKeyListener(new OnKeyListener(){
public boolean onKey(View v, int keyCode, KeyEvent event)
{
if (keyCode == 66){
sendMessageButton.performClick();
return true;
}
return false;
}
});
}
@Override
protected Dialog onCreateDialog(int id) {
int message = -1;
switch (id)
{
case MESSAGE_CANNOT_BE_SENT:
message = R.string.message_cannot_be_sent;
break;
}
if (message == -1)
{
return null;
}
else
{
return new AlertDialog.Builder(Messaging.this)
.setMessage(message)
.setPositiveButton(R.string.OK, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked OK so do some stuff */
}
})
.create();
}
}
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(messageReceiver);
unbindService(mConnection);
FriendController.setActiveFriend(null);
}
@Override
protected void onResume()
{
super.onResume();
bindService(new Intent(Messaging.this, IMService.class), mConnection , Context.BIND_AUTO_CREATE);
IntentFilter i = new IntentFilter();
i.addAction(IMService.TAKE_MESSAGE);
registerReceiver(messageReceiver, i);
FriendController.setActiveFriend(friend.userName);
}
public class MessageReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent)
{
Bundle extra = intent.getExtras();
String username = extra.getString(MessageInfo.USERID);
String message = extra.getString(MessageInfo.MESSAGETEXT);
if (username != null && message != null)
{
if (friend.userName.equals(username)) {
appendToMessageHistory(username, message);
localstoragehandler.insert(username,imService.getUsername(), message);
}
else {
if (message.length() > 15) {
message = message.substring(0, 15);
}
Toast.makeText(Messaging.this, username + " says '"+
message + "'",
Toast.LENGTH_SHORT).show();
}
}
}
};
private MessageReceiver messageReceiver = new MessageReceiver();
public void appendToMessageHistory(String username, String message) {
if (username != null && message != null) {
messageHistoryText.append(username + ":\n");
messageHistoryText.append(message + "\n");
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (localstoragehandler != null) {
localstoragehandler.close();
}
if (dbCursor != null) {
dbCursor.close();
}
}
}
로그 캣 메시지 :
뭔가가 null는 로그 캣은 –
가능 꽤 명백하다 [Null Pointer Exception이란 무엇이며 어떻게 수정합니까?] (http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception-and-how-do-i) -fix-it) –
그 핸들러 코드는? 또는 삽입 코드 – Elltz