您好我正在尝试使用Android应用程序（客户端）将字符串发送到我的java服务器但是当我点击“登录”按钮时我的应用程序崩溃和eclipse让我出现此错误：
06-05 15:24:53.506: E/AndroidRuntime(2843): FATAL EXCEPTION: main
06-05 15:24:53.506: E/AndroidRuntime(2843): android.os.NetworkOnMainThreadException
06-05 15:24:53.506: E/AndroidRuntime(2843): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133)
06-05 15:24:53.506: E/AndroidRuntime(2843): at libcore.io.BlockGuardOs.recvfrom(BlockGuardOs.java:163)
06-05 15:24:53.506: E/AndroidRuntime(2843): at libcore.io.IoBridge.recvfrom(IoBridge.java:506)
06-05 15:24:53.506: E/AndroidRuntime(2843): at java.net.PlainSocketImpl.read(PlainSocketImpl.java:488)
06-05 15:24:53.506: E/AndroidRuntime(2843): at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:46)
06-05 15:24:53.506: E/AndroidRuntime(2843): at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:240)
06-05 15:24:53.506: E/AndroidRuntime(2843): at libcore.io.Streams.readSingleByte(Streams.java:41)
06-05 15:24:53.506: E/AndroidRuntime(2843): at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:236)
06-05 15:24:53.506: E/AndroidRuntime(2843): at java.io.FilterInputStream.read(FilterInputStream.java:114)
06-05 15:24:53.506: E/AndroidRuntime(2843): at java.io.ObjectInputStream.checkReadPrimitiveTypes(ObjectInputStream.java:405)
06-05 15:24:53.506: E/AndroidRuntime(2843): at java.io.ObjectInputStream.read(ObjectInputStream.java:564)
06-05 15:24:53.506: E/AndroidRuntime(2843): at libcore.io.Streams.readFully(Streams.java:81)
06-05 15:24:53.506: E/AndroidRuntime(2843): at java.io.DataInputStream.readShort(DataInputStream.java:169)
06-05 15:24:53.506: E/AndroidRuntime(2843): at java.io.DataInputStream.readUnsignedShort(DataInputStream.java:182)
06-05 15:24:53.506: E/AndroidRuntime(2843): at java.io.DataInputStream.readUTF(DataInputStream.java:186)
06-05 15:24:53.506: E/AndroidRuntime(2843): at java.io.ObjectInputStream.readUTF(ObjectInputStream.java:2155)
06-05 15:24:53.506: E/AndroidRuntime(2843): at com.example.social_network.Login$2.onClick(Login.java:120)
06-05 15:24:53.506: E/AndroidRuntime(2843): at android.view.View.performClick(View.java:4240)
06-05 15:24:53.506: E/AndroidRuntime(2843): at android.view.View$PerformClick.run(View.java:17721)
06-05 15:24:53.506: E/AndroidRuntime(2843): at android.os.Handler.handleCallback(Handler.java:730)
06-05 15:24:53.506: E/AndroidRuntime(2843): at android.os.Handler.dispatchMessage(Handler.java:92)
06-05 15:24:53.506: E/AndroidRuntime(2843): at android.os.Looper.loop(Looper.java:137)
06-05 15:24:53.506: E/AndroidRuntime(2843): at android.app.ActivityThread.main(ActivityThread.java:5103)
06-05 15:24:53.506: E/AndroidRuntime(2843): at java.lang.reflect.Method.invokeNative(Native Method)
06-05 15:24:53.506: E/AndroidRuntime(2843): at java.lang.reflect.Method.invoke(Method.java:525)
06-05 15:24:53.506: E/AndroidRuntime(2843): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
06-05 15:24:53.506: E/AndroidRuntime(2843): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
06-05 15:24:53.506: E/AndroidRuntime(2843): at dalvik.system.NativeStart.main(Native Method)
我正在使用AsyncTask创建一个新的Socket，但我不知道哪个按钮监听器需要编写
- ＆GT; android代码：
public class Login extends ActionBarActivity {
private TextView register;
private TextView connection;
private Button login;
private EditText email;
private EditText password;
private static ObjectOutputStream oos;
private static ObjectInputStream ois;
Socket client;
private class myTask extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(String... params) {
try {
client = new Socket("10.10.2.209", 4444); //connect to server
oos = new ObjectOutputStream(client.getOutputStream());
ois = new ObjectInputStream(client.getInputStream());
}catch (ConnectException e){
return "Host not found";
}catch (IOException e) {
return "Exception Caught";
}
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if ("Host not found".equalsIgnoreCase(result)){
Toast.makeText(getApplicationContext(), "Host not found" ,Toast.LENGTH_LONG).show();
}else if("Exception Caught".equalsIgnoreCase(result)){
Toast.makeText(getApplicationContext(), "Connection error" ,Toast.LENGTH_LONG).show();
}else{
Toast.makeText(getApplicationContext(), "Connection established" ,Toast.LENGTH_LONG).show();
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
register = (TextView)findViewById(R.id.register);
login = (Button)findViewById(R.id.login);
email = (EditText)findViewById(R.id.email);
password = (EditText)findViewById(R.id.password);
connection = (TextView)findViewById(R.id.connection);
new myTask().execute();
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
register.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View arg0) {
startActivity(new Intent(Login.this, Register.class));
}
});
login.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View arg0) {
try {
oos.writeUTF("LOGIN");
oos.flush();
String emailText = email.getText().toString();
oos.writeUTF(emailText);
oos.flush();
String passwordText = password.getText().toString();
oos.writeUTF(passwordText);
oos.flush();
String string = ois.readUTF();
connection.setText(string);
if(string.equals("Login successfully Done!")){
connection.setText("Login done!");
}
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.login, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_login, container, false);
return rootView;
}
}
}
感谢
答案 0 :(得分：0)
我不知道如何在＆＃34; onPostExecute＆＃34;中调用按钮监听器。方法
您无法在onPostExecute()中调用按钮侦听器。你搬家了：
套接字读取逻辑为doInBackground()和
将UI更新逻辑转换为onPostExecute()
然后，您从按钮侦听器执行AsyncTask。