android-混淆将代码放入AsyncTask

概述我有此代码来接收聊天消息.但是当我尝试将其放入AsyncTask时感到困惑.我将警告信息读入postexecute时无法解析为read.readline().我想使此代码在后台运行,以检查是否有任何消息.我想问一下,要使代码始终在后台运行,是使用AsyncTask还是有其他方法做到这一点？任何人都请帮助我,我感

我有此代码来接收聊天消息.但是当我尝试将其放入AsyncTask时感到困惑.我将警告信息读入postexecute时无法解析为read.readline().
我想使此代码在后台运行,以检查是否有任何消息.我想问一下,要使代码始终在后台运行,是使用AsyncTask还是有其他方法做到这一点？
任何人都请帮助我,我感到困惑.谢谢

接收消息部分

httpURLConnection connection;        URL url = null;        try{            linkurl = new Koneksi(this);            SERVER_URL = linkurl.getUrl();            SERVER_URL += "/mobile/ChatRoom.PHP?IDu="+param2+"&IDch="+param3+"&IDcm="+param4;            url = new URL(SERVER_URL);            connection = (httpURLConnection) url.openConnection();            connection.setDoOutput(true);            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");            connection.setRequestMethod("POST");                httpClIEnt httpClIEnt = new DefaulthttpClIEnt();            httpPost httpPost = new httpPost(SERVER_URL);            //ArrayList<nameValuePair> param = new ArrayList<nameValuePair>();            //add parameter                //httpPost.setEntity(new UrlEncodedFormEntity(param));                httpResponse httpRespose = httpClIEnt.execute(httpPost);                httpentity httpentity = httpRespose.getEntity();                //read content                inputStream in = httpentity.getContent();                BufferedReader read = new BufferedReader(new inputStreamReader(in));                String msg = "tes";                while(true)                {                    try {                        msg = read.readline();                        Log.d("","MSGGG:  "+ msg);                        //msgList.add(msg);                    } catch (IOException e) {                        // Todo auto-generated catch block                        e.getMessage();                    }                    if(msg == null)                    {                        break;                    }                    else                    {                        showMessage(msg, false);                    }                }}        catch (IOException e) {            // Todo auto-generated catch block            e.printstacktrace();        }            }

我尝试过的AsyncTask部分-已更新,但在getintent()处收到警告,我必须在其中放置这些代码？

public class ReceivedTask extends AsyncTask<String, String, String> {    Bundle bundle = this.getIntent().getExtras();    final String param2 = bundle.getString("keyUserID");    final String param3 = bundle.getString("keyChatsID");     String param4 = bundle.getString("keyMessagesID");    @OverrIDe    protected voID onPreExecute() {        // Todo auto-generated method stub        super.onPreExecute();    }    @OverrIDe    protected String doInBackground(String... arg0) {        // Todo auto-generated method stub        httpURLConnection connection;        URL url = null;        try{            linkurl = new Koneksi(ChatRoom.this);            SERVER_URL = linkurl.getUrl();            SERVER_URL += "/mobile/ChatRoom.PHP?IDu="+param2+"&IDch="+param3+"&IDcm="+param4;            url = new URL(SERVER_URL);            connection = (httpURLConnection) url.openConnection();            connection.setDoOutput(true);            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");            connection.setRequestMethod("POST");                httpClIEnt httpClIEnt = new DefaulthttpClIEnt();            httpPost httpPost = new httpPost(SERVER_URL);            //ArrayList<nameValuePair> param = new ArrayList<nameValuePair>();            //add parameter                //httpPost.setEntity(new UrlEncodedFormEntity(param));                httpResponse httpRespose = httpClIEnt.execute(httpPost);                httpentity httpentity = httpRespose.getEntity();                //read content                inputStream in = httpentity.getContent();                BufferedReader read = new BufferedReader(new inputStreamReader(in));                String msg = "tes";                while(true)                {                    try {                        msg = read.readline();                        Log.d("","MSGGG:  "+ msg);                        //msgList.add(msg);                    } catch (IOException e) {                        // Todo auto-generated catch block                        e.getMessage();                    }                    if(msg == null)                    {                        break;                    }                    else                    {                        showMessage(msg, false);                    }                }}        catch (IOException e) {            // Todo auto-generated catch block            e.printstacktrace();        }            }    }

ChatRoom.java-我的完整代码

public class ChatRoom extends Activity {    public Koneksi linkurl;    String SERVER_URL;    private EditText messageText;    private TextVIEw meLabel;    private TextVIEw frIEndLabel;    private VIEwGroup messagesContainer;    private ScrollVIEw scrollContainer;/*    private Handler handler = new Handler();*/    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.chatpage);        messagesContainer = (VIEwGroup) findVIEwByID(R.ID.messagesContainer);        scrollContainer = (ScrollVIEw) findVIEwByID(R.ID.scrollContainer);        button sendMessagebutton = (button) findVIEwByID(R.ID.sendbutton);        Bundle bundle = this.getIntent().getExtras();        /*final String paramnama = bundle.getString("nama");*/        messageText = (EditText) findVIEwByID(R.ID.messageEdit);        meLabel = (TextVIEw) findVIEwByID(R.ID.meLabel);        frIEndLabel = (TextVIEw) findVIEwByID(R.ID.frIEndLabel);        meLabel.setText("me");        final String param1 = bundle.getString("keyCourseID");        final String param2 = bundle.getString("keyUserID");        final String param3 = bundle.getString("keyChatsID");         String param4 = bundle.getString("keyMessagesID");        sendMessagebutton.setonClickListener(new VIEw.OnClickListener() {            @OverrIDe            public voID onClick(VIEw v) {                // Todo auto-generated method stub                ArrayList<nameValuePair> postParameters = new ArrayList<nameValuePair>();                postParameters.add(new BasicnameValuePair("messages", messageText.getText().toString()));                String response = null;                try {                    linkurl = new Koneksi(ChatRoom.this);                    SERVER_URL = linkurl.getUrl();                    SERVER_URL += "/mobile/ChatKirimTeks.PHP?IDu="+param2+"&IDch="+param3;                   response = CoursehttpClIEnt.executehttpPost(SERVER_URL, postParameters);                   String res = response.toString();                   res = res.trim();                   res = res.replaceAll("\s+","");                   if(res.equals("1")){                       String messageString = messageText.getText().toString();                       showMessage(messageString, true);                       messageText.getText().clear();                   }else                   {                       createDialog("Maaf", "Messages Anda Gagal Terkirim");                   }                }                catch (Exception e) {                    messageText.setText(e.toString());                  }             }        });        httpURLConnection connection;        URL url = null;        try{            linkurl = new Koneksi(this);            SERVER_URL = linkurl.getUrl();            SERVER_URL += "/mobile/ChatRoom.PHP?IDu="+param2+"&IDch="+param3+"&IDcm="+param4;            url = new URL(SERVER_URL);            connection = (httpURLConnection) url.openConnection();            connection.setDoOutput(true);            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");            connection.setRequestMethod("POST");                httpClIEnt httpClIEnt = new DefaulthttpClIEnt();            httpPost httpPost = new httpPost(SERVER_URL);            //ArrayList<nameValuePair> param = new ArrayList<nameValuePair>();            //add parameter                //httpPost.setEntity(new UrlEncodedFormEntity(param));                httpResponse httpRespose = httpClIEnt.execute(httpPost);                httpentity httpentity = httpRespose.getEntity();                //read content                inputStream in = httpentity.getContent();                BufferedReader read = new BufferedReader(new inputStreamReader(in));                String msg = "tes";                while(true)                {                    try {                        msg = read.readline();                        Log.d("","MSGGG:  "+ msg);                        //msgList.add(msg);                    } catch (IOException e) {                        // Todo auto-generated catch block                        e.getMessage();                    }                    if(msg == null)                    {                        break;                    }                    else                    {                        showMessage(msg, false);                    }                }}        catch (IOException e) {            // Todo auto-generated catch block            e.printstacktrace();        }            }    public class ReceivedTask extends AsyncTask<String, String, String> {        @OverrIDe        protected voID onPreExecute() {        }        @OverrIDe        protected String doInBackground(String... arg0) {            // Todo auto-generated method stub            httpURLConnection connection;            URL url = null;            try{                linkurl = new Koneksi(ChatRoom.this);                SERVER_URL = linkurl.getUrl();                SERVER_URL += "/mobile/ChatRoom.PHP?IDu="+param2+"&IDch="+param3+"&IDcm="+param4;                url = new URL(SERVER_URL);                connection = (httpURLConnection) url.openConnection();                connection.setDoOutput(true);                connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");                connection.setRequestMethod("POST");                    httpClIEnt httpClIEnt = new DefaulthttpClIEnt();                httpPost httpPost = new httpPost(SERVER_URL);                //ArrayList<nameValuePair> param = new ArrayList<nameValuePair>();                //add parameter                    //httpPost.setEntity(new UrlEncodedFormEntity(param));                    httpResponse httpRespose = httpClIEnt.execute(httpPost);                    httpentity httpentity = httpRespose.getEntity();                    //read content                    inputStream in = httpentity.getContent();                    BufferedReader read = new BufferedReader(new inputStreamReader(in));            }            catch (IOException e) {                // Todo auto-generated catch block                e.printstacktrace();                return null;            }        }        @OverrIDe        protected voID onPostExecute(String result) {            // Todo auto-generated method stub            super.onPostExecute(result);            String msg = "tes";            while(true)            {                try {                    msg = read.readline();                    Log.d("","MSGGG:  "+ msg);                    //msgList.add(msg);                } catch (IOException e) {                    // Todo auto-generated catch block                    e.getMessage();                }                if(msg == null)                {                    break;                }                else                {                    showMessage(msg, false);                }            }        }    }    public voID showMessage(String message, boolean leftSIDe) {        final TextVIEw textVIEw = new TextVIEw(ChatRoom.this);        textVIEw.setTextcolor(color.BLACK);        textVIEw.setText(message);        int bgRes = R.drawable.left_message_bg;        linearLayout.LayoutParams params = new linearLayout.LayoutParams(                linearLayout.LayoutParams.WRAP_CONTENT, linearLayout.LayoutParams.WRAP_CONTENT);        if (!leftSIDe) {            bgRes = R.drawable.right_message_bg;            params.gravity = Gravity.RIGHT;        }        textVIEw.setLayoutParams(params);        textVIEw.setBackgroundResource(bgRes);        runOnUiThread(new Runnable() {            @OverrIDe            public voID run() {                messagesContainer.addVIEw(textVIEw);                // Scroll to bottom                if (scrollContainer.getChildAt(0) != null) {                    scrollContainer.scrollTo(scrollContainer.getScrollX(), scrollContainer.getChildAt(0).getHeight());                }                scrollContainer.fullScroll(VIEw.FOCUS_DOWN);            }        });    }    private voID createDialog(String Title, String text) {        AlertDialog ad = new AlertDialog.Builder(this)        .setPositivebutton("Ok", null)        .setTitle(Title)        .setMessage(text)        .create();        ad.show();    }}

解决方法:

您收到的错误消息无法解决,因为AndroID禁止您从用户界面线程访问互联网.您必须在后台线程中执行此 *** 作.的确,使用AsyncTask的目的是使用户界面线程尽可能地自由.

每当我使用AsyncTask时,通常都会创建一个类来保存任务的所有参数,并创建另一个类来保存结果.另外,我确保结果类可以代表可能发生的任何错误情况,例如引发异常.因此,我使用的通用模板看起来像这样(注意：这是用于不需要进度报告的情况).

public class MyActivity extends Activity {    static class MyAsyncTaskParameters {        // put all the parameters that the task will need here    }    voID KickOffAsynctask(...) {  // varIoUs arguments as required by the task in hand        MyAsyncTaskParameters params = new MyAsyncTaskParameters(...);  // package up all the parameters        MyAsyncTask newtask = new MyAsyncTask();        newtask.execute(params);    }    static class MyAsyncTaskResults {        // put all the results that the task can generate here        // NOTE: errors can occur in tasks, also exceptions        //       can be thrown in tasks, so make it possible        //       for this class to describe all error conditions that can occur    }    static class MyAsyncTask extends AsyncTask<MyAsyncTaskParameters, VoID, MyAsyncTaskResults> {        @OverrIDe        protected MyAsyncTaskResults doInBackground(MyAsyncTaskParameters... params) {            MyAsyncTaskResults results = new MyAsyncTaskResults();            try {                MyAsyncTaskParameters taskParameters = params[0];                // This method will run in a background thread, so                // do as much as possible of the AsyncTask here.            } catch (Throwable e) {                // Set results object to indicate that an exception occurred.            }            return results;        }        @OverrIDe        protected voID onPostExecute(MyAsyncTaskResults res) {            // This method will run in the User Interface thread.            // Use it to deal with the results stored in res.            // If an error has occurred, the res object will have it stored            // so take appropriate action, e.g. report to user.        }    }}

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