Question

我遇到从Android设备到PC的Socket连接问题在第一次，在LoginActivity中，我的应用程序使用登录名和密码正确连接到带有套接字的服务器但是，第二次，在CompteActivity中，当我想连接从同一套接字的数据库导入一些数据时，我的应用程序被停止了。
但是，在模拟器中运行没有问题。

在logcat中：

04-21 06:45:26.639: E/AndroidRuntime(13862): FATAL EXCEPTION: main
04-21 06:45:26.639: E/AndroidRuntime(13862): android.os.NetworkOnMainThreadException
04-21 06:45:26.639: E/AndroidRuntime(13862):    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at libcore.io.IoBridge.connect(IoBridge.java:112)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at java.net.Socket.startupSocket(Socket.java:566)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at java.net.Socket.tryAllAddresses(Socket.java:127)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at java.net.Socket.<init>(Socket.java:177)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at java.net.Socket.<init>(Socket.java:149)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at pfe.mobilebanking.atbmobile.CompteActivity$1.onClick(CompteActivity.java:81)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at android.view.View.performClick(View.java:3516)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at android.view.View$PerformClick.run(View.java:14110)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at android.os.Handler.handleCallback(Handler.java:605)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at android.os.Handler.dispatchMessage(Handler.java:92)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at android.os.Looper.loop(Looper.java:137)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at  android.app.ActivityThread.main(ActivityThread.java:4429)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at java.lang.reflect.Method.invokeNative(Native Method)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at java.lang.reflect.Method.invoke(Method.java:511)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
04-21 06:45:26.639: E/AndroidRuntime(13862):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

没有代码我无法帮助你，但是这个例外应该指出你正确的方向：

04-21 06:45:26.639: E/AndroidRuntime(13862): android.os.NetworkOnMainThreadException

基本上在较新的操作系统版本（我认为4.0+）中，Google启用了StrictMode，它不允许在主UI线程上访问网络。他们这样做专门用于帮助开发人员，因为网络可以花费不确定的时间，这将阻止用户界面在网络呼叫持续时进行响应或更新。

因此，您需要找到从套接字导入数据的代码，并将其放入AsyncTask，IntentService或其他一些主UI UI线程中。

Answer 2

确定！在清单中：

<uses-sdk
    android:minSdkVersion="7"
    android:targetSdkVersion="18" />

<uses-permission
    android:name="android.permission.INTERNET"
    android:maxSdkVersion="19" />

这是我在LoginActivity和CompteActitvity中的代码......

LoginActivity：

public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {

    String cin = null;
    String pass = null;
    String reponse = null;

    public UserLoginTask(String cin, String pass) {
        // TODO Auto-generated constructor stub
        this.cin = cin;
        this.pass = pass;
    }

    @Override
    protected Boolean doInBackground(Void... params) {
        // TODO: attempt authentication against a network service.

        try {
            // Simulate network access.
            Thread.sleep(2000);

        } catch (InterruptedException e) {
            return false;
        }


        try {
            clientSocket = new Socket(Inet4Address.getByName("192.168.100.1"), 2014);
            in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
            out = new PrintWriter(clientSocket.getOutputStream());
            out.println("connexion");
            out.println(cin);
            out.println(pass);
            out.flush();
            reponse = in.readLine();

        } catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        if(reponse.equals("ok"))
            return true;
        else
            return false;

        // TODO: register the new account here.
        //return true;
    }

    @Override
    protected void onPostExecute(final Boolean success) {
        mAuthTask = null;
        showProgress(false);

        if (success) {
            finish();

            String [] numCompte = new String [10];
            int i=0;
            try {
                System.out.println("envoie de INtent");
                while(in.ready())
                {
                    numCompte [i] = in.readLine();
                    System.out.println(numCompte[i]);
                    i++;
                }
                clientSocket.close();
                in.close();
                out.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            Intent secondeActivity = new Intent(LoginActivity.this,        EspaceClientActivity.class);

            secondeActivity.putExtra("numero_compte", numCompte);

            startActivity(secondeActivity);

        } else {
            mPasswordView
                    .setError(getString(R.string.error_incorrect_password));
            mPasswordView.requestFocus();
        }
    }

CompteActivity：

OnClickListener afficher = new OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

        int select = 0;
        float total = 0;

        try {
            System.out.println("lancement de socket");
            Socket clientSocket  = new Socket(Inet4Address.getByName("192.168.100.1"), 2014);
            in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
            out = new PrintWriter(clientSocket.getOutputStream());
            out.println("compte");

            String [] compteSelected = new String[mNumCompte.length];
            for(int i = 0;i<mListCompte.getCount();i++)
            {
                if(mListCompte.isItemChecked(i))
                {
                    compteSelected [select] = mListCompte.getItemAtPosition(i).toString();
                    //System.out.println(compteSelected[select]);
                    out.println(compteSelected[select]);
                    select++;
                }
            }

            out.flush();

            mSoldeCompte = new String[select+1];

            for (int i = 0; i<select;i++)
            {
                reponse = in.readLine();
                mSoldeCompte[i]=reponse;
                //System.out.println(mSoldeCompte[i]);
                total += Float.parseFloat(mSoldeCompte[i]);
            }
            //System.out.println("Float à ajouter..." + total);
            mSoldeCompte[select]= String.valueOf(total).toString();
            //System.out.println("valeur ajoutée..."+mSoldeCompte[select]);
            String [][] afficheElementSolde = new String[select+1][select+1];
            for(int i = 0;i<select;i++)
            {
                afficheElementSolde[i][0] = compteSelected[i];
            }
            for(int i = 0;i<select+1;i++)
            {
                afficheElementSolde[i][1] = mSoldeCompte[i];
            }
            afficheElementSolde[select][0]="Total";


            List<HashMap<String, String>> liste = new ArrayList<HashMap<String, String>>();
            HashMap<String, String> element;

            for(int i = 0;i<select+1;i++)
            {
                element = new HashMap<String, String>();
                element.put("num_compte", afficheElementSolde[i][0]);
                element.put("sol_compte", afficheElementSolde[i][1]);
                liste.add(element);
            }

            //System.out.println("affichage de solde");
            ListAdapter adapter = new SimpleAdapter(CompteActivity.this , liste, android.R.layout.simple_list_item_2, new String[] {"num_compte","sol_compte"}, new int[]{android.R.id.text1,android.R.id.text2});
            mListSolde.setAdapter(adapter);



            clientSocket.close();
            in.close();
            out.close();
        } catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

};

只是为了提醒你，这个代码在模拟器中运行没有问题，而在android设备（os版本：4.0.4）中，问题出现在CompteActivity的这一行：

Socket clientSocket  = new Socket(Inet4Address.getByName("192.168.100.1"), 2014);

Answer 3

晚上好谢谢你的帮助！ :) 关于OS 4.0+版本的评论，我把我的代码放到了类中，扩展了AsyncTask 在CompteActivity中，就像你告诉我的那样......

这是我正确运行的新代码：

公共类CompteActivity扩展了Activity {

private UserCompteTask mSoldeTask;
private BufferedReader in = null;
private PrintWriter out = null;
String reponse = null;
Socket clientSocket;

private ListView mListCompte = null;
private ListView mListSolde = null;
private String [] mNumCompte = null;

//private String [] mSoldeCompte = null;

private Button boutonAfficher = null;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_compte);

    mListCompte = (ListView)findViewById(R.id.list_num_compte_compte);
    mListSolde = (ListView)findViewById(R.id.info_compte);

    boutonAfficher = (Button)findViewById(R.id.button_compte_affiche);


    boutonAfficher.setOnClickListener(afficher);


    Intent chargeNum = getIntent();
    mNumCompte = chargeNum.getStringArrayExtra("liste_compte");

    mListCompte.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_multiple_choice, mNumCompte));
    mListCompte.setItemChecked( 0, false);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.compte, menu);
    return true;
}

OnClickListener afficher = new OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

        mSoldeTask = new UserCompteTask();
        mSoldeTask.execute((Void) null);


    }

};

public class UserCompteTask extends AsyncTask<Void, Void, Boolean>
{
    int select = 0;
    float total = 0;
    private String [] mSoldeCompte = null;
    String [] compteSelected = new String[mNumCompte.length];

    @Override
    protected Boolean doInBackground(Void... params) {
        // TODO Auto-generated method stub

        try {
            // Simulate network access.
            Thread.sleep(1000);

        } catch (InterruptedException e) {
            return false;
        }



        try
        {

            clientSocket  = new Socket("192.168.100.1", 2014);
            in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
            out = new PrintWriter(clientSocket.getOutputStream());
            out.println("compte");

            for(int i = 0;i<mListCompte.getCount();i++)
            {
                if(mListCompte.isItemChecked(i))
                {
                    compteSelected [select] = mListCompte.getItemAtPosition(i).toString();
                    //System.out.println(compteSelected[select]);
                    out.println(compteSelected[select]);
                    select++;
                }
            }

            out.flush();

            mSoldeCompte = new String[select+1];

            for (int i = 0; i<select;i++)
            {
                reponse = in.readLine();
                mSoldeCompte[i]=reponse;
                //System.out.println(mSoldeCompte[i]);
                total += Float.parseFloat(mSoldeCompte[i]);
            }
            //System.out.println("Float à ajouter..." + total);
            mSoldeCompte[select]= String.valueOf(total).toString();
            //System.out.println("valeur ajoutée..."+mSoldeCompte[select]);

            clientSocket.close();
            in.close();
            out.close();
        }catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return true;
    }

    @Override
    protected void onPostExecute(final Boolean success) {

        mSoldeTask = null;

        if (success) {

            String [][] afficheElementSolde = new String[select+1][select+1];
            for(int i = 0;i<select;i++)
            {
                afficheElementSolde[i][0] = compteSelected[i];
            }
            for(int i = 0;i<select+1;i++)
            {
                afficheElementSolde[i][1] = mSoldeCompte[i];
            }
            afficheElementSolde[select][0]="Total";

            List<HashMap<String, String>> liste = new ArrayList<HashMap<String, String>>();
            HashMap<String, String> element;

            for(int i = 0;i<select+1;i++)
            {
                element = new HashMap<String, String>();
                element.put("num_compte", afficheElementSolde[i][0]);
                element.put("sol_compte", afficheElementSolde[i][1]);
                liste.add(element);
            }

            //System.out.println("affichage de solde");
            ListAdapter adapter = new SimpleAdapter(CompteActivity.this , liste, android.R.layout.simple_list_item_2, new String[] {"num_compte","sol_compte"}, new int[]{android.R.id.text1,android.R.id.text2});
            mListSolde.setAdapter(adapter);
        }
    }

    @Override
    protected void onCancelled() {
        mSoldeTask = null;

    }
}

}

使用socket从Android设备连接到pc？

3 个答案: