使用AsyncTask的为Android的网络连接 [英] Using AsyncTask for android network connection
本文介绍了使用AsyncTask的为Android的网络连接的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在使用的AsyncTask 一些麻烦，因为我从来没有遇到过它之前，没有任何线索，我在做什么吧。
基本上，我得到一个强制关闭，因为我想运行在主类的连接。可能有人有可能帮助我与添加的AsyncTask 进入code：
包com.smarte.smartipcontrol;
进口java.io.BufferedReader中;
进口java.io.BufferedWriter中;
进口java.io.IOException异常;
进口java.io.InputStreamReader中;
进口java.io.OutputStreamWriter中;
进口的java.io.PrintWriter;
进口的java.net.InetAddress;
进口的java.net.Socket;
进口的java.net.UnknownHostException;
进口android.app.Activity;
进口android.content.Intent;
进口android.os.Bundle;
进口android.view.View;
公共类IPControl延伸活动{
私人Socket套接字;
私人字符串serverIpAddress;
私有静态最终诠释REDIRECTED_SERVERPORT = 32;
公共PrintWriter的输出;
公众的BufferedReader的;
@覆盖
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
//从意图消息
意向意图= getIntent（）;
serverIpAddress = intent.getStringExtra（IPEntry.ACTUALSMARTIP）;
的createConnection（）;
}
公共无效getModel（查看视图）{
尝试 {
通过out.println（[M \ r \ N）;
//System.out.print("root\r\n）;
而（在。就绪（）！）;
串textStatus = readBuffer（）;
}赶上（IOException异常E）{}
}
公共无效的createConnection（）{
尝试 {
InetAddress类serverAddr = InetAddress.getByName（serverIpAddress）;
插座=新的Socket（serverAddr，REDIRECTED_SERVERPORT）;
}赶上（UnknownHostException异常E1）{
e1.printStackTrace（）;
}赶上（IOException异常E1）{
e1.printStackTrace（）;
}
尝试 {
OUT =的新PrintWriter（新的BufferedWriter（新OutputStreamWriter（socket.getOutputStream（））），TRUE）;在=新的BufferedReader（新的InputStreamReader（socket.getInputStream（）））;
而（在。就绪（）！）;
readBuffer（）;
通过out.println（根\ r \ N）;
//System.out.print("root\r\n）;
而（在。就绪（）！）;
readBuffer（）;
通过out.println（根\ r \ N）;
//System.out.print("root\r\n）;
而（在。就绪（）！）;
readBuffer（）;
}赶上（IOException异常E）{}
//R.id.textStatus
}
私人字符串readBuffer（）抛出IOException异常{
弦乐味精=;
而（在。就绪（））{
MSG = MSG +（炭）的.read（）;
}
//System.out.print(msg）;
如果（msg.indexOf（SNX_COM＆gt;中！）= -1）返回msg.substring（0，msg.indexOf（SNX_COM＆gt;中））;
否则返回味精;
}
}
解决方案
它是如何看migtht就像刚一简单的例子：
公共类IPControl延伸活动{
私人ProgressDialog PD = NULL;
私人字符串数据= NULL;
私人Socket套接字;
私人字符串serverIpAddress;
私有静态最终诠释REDIRECTED_SERVERPORT = 32;
公共PrintWriter的输出;
公众的BufferedReader的;
@覆盖
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.main）;
尝试{
this.pd = ProgressDialog.show（这一点，加载。，请等待......，真，假）;
新AsyncAction（）执行（）。
}赶上（例外五）{
e.printStackTrace（）;
}
}
私有类AsyncAction扩展的AsyncTask＆LT;字符串，太虚，字符串＆GT; {
保护无效doInBackground（字符串参数... args）{
尝试 {
InetAddress类serverAddr = InetAddress.getByName（serverIpAddress）;
插座=新的Socket（serverAddr，REDIRECTED_SERVERPORT）;
}赶上（UnknownHostException异常E1）{
e1.printStackTrace（）;
}赶上（IOException异常E1）{
e1.printStackTrace（）;
}
尝试 {
OUT =的新PrintWriter（新的BufferedWriter（新OutputStreamWriter（socket.getOutputStream（））），TRUE）;
在=新的BufferedReader（新的InputStreamReader（socket.getInputStream（）））;
而（in.ready（）！）;
readBuffer（）;
通过out.println（根\ r \ N）;
//System.out.print("root\r\n）;
而（在。就绪（）！）;
readBuffer（）;
通过out.println（根\ r \ N）;
//System.out.print("root\r\n）;
而（在。就绪（）！）;
弦乐味精=;
而（in.ready（））{
MSG = MSG +（炭）的.read（）;
}
}赶上（IOException异常E）{}
返回null; //返回要传递给onPostExecute什么（）
}
保护无效onPostExecute（字符串结果）{
// resultis从doInbackground返回的数据
IPControl.this.data =结果;
如果（IPControl.this.pd！= NULL）{
IPControl.this.pd.dismiss（）;
}
}
}
I am having some trouble using AsyncTask as I have never come across it before and have no clue what I am doing with it.
Basically I am getting a force close because I am trying to run the connection on a main class. Could someone possibly help me with adding AsyncTask into the code:
package com.smarte.smartipcontrol;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
public class IPControl extends Activity {
private Socket socket;
private String serverIpAddress;
private static final int REDIRECTED_SERVERPORT = 32;
public PrintWriter out;
public BufferedReader in ;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get the message from the intent
Intent intent = getIntent();
serverIpAddress = intent.getStringExtra(IPEntry.ACTUALSMARTIP);
createConnection();
}
public void getModel(View view) {
try {
out.println("[m\r\n");
//System.out.print("root\r\n");
while (! in .ready());
String textStatus = readBuffer();
} catch (IOException e) {}
}
public void createConnection() {
try {
InetAddress serverAddr = InetAddress.getByName(serverIpAddress);
socket = new Socket(serverAddr, REDIRECTED_SERVERPORT);
} catch (UnknownHostException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
}
try {
out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true); in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
while (! in .ready());
readBuffer();
out.println("root\r\n");
//System.out.print("root\r\n");
while (! in .ready());
readBuffer();
out.println("root\r\n");
//System.out.print("root\r\n");
while (! in .ready());
readBuffer();
} catch (IOException e) {}
//R.id.textStatus
}
private String readBuffer() throws IOException {
String msg = "";
while ( in .ready()) {
msg = msg + (char) in .read();
}
//System.out.print(msg);
if (msg.indexOf("SNX_COM> ") != -1) return msg.substring(0, msg.indexOf("SNX_COM> "));
else return msg;
}
}
解决方案
Just one quick example of how it migtht look like:
public class IPControl extends Activity {
private ProgressDialog pd = null;
private String data = null;
private Socket socket;
private String serverIpAddress;
private static final int REDIRECTED_SERVERPORT = 32;
public PrintWriter out;
public BufferedReader in ;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
try{
this.pd = ProgressDialog.show(this, "Loading..", "Please Wait...", true, false);
new AsyncAction().execute();
}catch (Exception e) {
e.printStackTrace();
}
}
private class AsyncAction extends AsyncTask<String, Void, String> {
protected Void doInBackground(String... args) {
try {
InetAddress serverAddr = InetAddress.getByName(serverIpAddress);
socket = new Socket(serverAddr, REDIRECTED_SERVERPORT);
} catch (UnknownHostException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
}
try {
out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
while (! in.ready());
readBuffer();
out.println("root\r\n");
//System.out.print("root\r\n");
while (! in .ready());
readBuffer();
out.println("root\r\n");
//System.out.print("root\r\n");
while (! in .ready());
String msg = "";
while (in.ready()) {
msg = msg + (char) in .read();
}
} catch (IOException e) {}
return null;//returns what you want to pass to the onPostExecute()
}
protected void onPostExecute(String result) {
//resultis the data returned from doInbackground
IPControl.this.data = result;
if (IPControl.this.pd != null) {
IPControl.this.pd.dismiss();
}
}
}
这篇关于使用AsyncTask的为Android的网络连接的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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