我对android编程很陌生。我有一个程序，它使用套接字连接到远程主机、欺骗 http 请求并解析结果。由于某种原因，我的套接字无法连接到主机。我已经在独立环境中测试了该程序，它可以连接并正常工作。我继续并隔离了我需要的函数，并将其包含在我的活动类中以这种方式调用它。我也尝试过静态调用它，以及执行一个异步对象并从那里调用它。我的 android 模拟器上的互联网可以通过浏览器运行，我添加了
<uses-permission android:name="android.permission.INTERNET"/>
到我的 android 清单。下面的代码显示了我现在的位置。我需要做什么？
public class FlightNumResults extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
Intent intent = getIntent();
String value = intent.getStringExtra("input"); //if it's a string you stored.
//super.onCreate(savedInstanceState);
System.out.println("HULLO");
System.out.println(value);
setContentView(R.layout.loading);
Log.i("Excecution", "Complete");
Hashtable<String, String> table = flightNumInfo(value);
if (table == null)
System.out.println("NULL");
TableLayout results = (TableLayout) findViewById(R.id.resultTable);
TableRow rowLabels = new TableRow(this);
TableRow rowResults = new TableRow(this);
rowLabels.setGravity(Gravity.CENTER);
TableRow.LayoutParams params = new TableRow.LayoutParams();
params.span = 4;
//Column 1
TextView destLabel = new TextView(this);
destLabel.setText("Destination");
destLabel.setTypeface(Typeface.SERIF, Typeface.BOLD);
TextView destResult = new TextView(this);
destResult.setText(table.get("destination"));
destResult.setGravity(Gravity.CENTER_HORIZONTAL);
rowLabels.addView(destLabel);
rowResults.addView(destResult);
//Column 2
TextView gateLabel = new TextView(this);
destLabel.setText("Gate");
destLabel.setTypeface(Typeface.SERIF, Typeface.BOLD);
TextView gateResult = new TextView(this);
destResult.setText(table.get("gate"));
destResult.setGravity(Gravity.CENTER_HORIZONTAL);
rowLabels.addView(gateLabel);
rowResults.addView(gateResult);
//Column 3
TextView scheduledLabel = new TextView(this);
destLabel.setText("Scheduled");
destLabel.setTypeface(Typeface.SERIF, Typeface.BOLD);
TextView scheduledResult = new TextView(this);
destResult.setText(table.get("scheduled"));
destResult.setGravity(Gravity.CENTER_HORIZONTAL);
rowLabels.addView(scheduledLabel);
rowResults.addView(scheduledResult);
//Column 4
TextView estimatedLabel = new TextView(this);
destLabel.setText("estimated");
destLabel.setTypeface(Typeface.SERIF, Typeface.BOLD);
TextView estimatedResult = new TextView(this);
destResult.setText(table.get("scheduled"));
destResult.setGravity(Gravity.CENTER_HORIZONTAL);
rowLabels.addView(estimatedLabel);
rowResults.addView(estimatedResult);
results.addView(rowLabels);
results.addView(rowResults);
setContentView(R.layout.activity_flightnum_results);
}
public Hashtable<String, String> flightNumInfo(String flightNum) {
Hashtable<String, String> table = new Hashtable<String, String>();
System.out.println("Initializing socket");
try {
String request = "GET /flifo/servlet/DeltaFlifo?airline_code=DL&flight_number="
+ flightNum
+ "&flight_date="
+ DateCalc.getSlashDateAndTime()
+ "&request=main&DptText=ATL HTTP/1.1";
Socket conn = new Socket(InetAddress.getByName("www.delta.com"), 80);
System.out.println("initialized");
PrintWriter wr = new PrintWriter(conn.getOutputStream());
wr.println(request);
wr.println("Host: www.delta.com");
wr.println("Referer: http://www.delta.com/flifo/servlet/DeltaFlifo?airline_code=DL&request=main");
wr.println("Connection: close\n");
wr.flush();
Scanner in = new Scanner(conn.getInputStream());
String myResp = new String();
String ans = new String();
do {
ans = in.nextLine();
myResp += ans;
} while (ans.indexOf("<span class=\"detailsLabel\"><br />") < 0);
wr.close();
in.close();
// System.out.println(myResp);
Pattern p = Pattern
.compile("<td class=\"tableCell\" align=\"left\"> \\s+Atlanta\\s+"
+ "<a href=\"/content/www/en_US/traveling-with-us/airports-and-aircraft/airports/atlanta.html\">"
+ "<!-- mp_trans_disable_start -->\\(ATL\\)<!-- mp_trans_disable_end --></a>\\s+<br /> (.*?)"
+ "<br /> Gate <!-- mp_trans_disable_start -->([A-Z0-9]{2,3})<!-- mp_trans_disable_end -->\\s+"
+ "</td>\\s+<td class=\"tableCell\">\\s+ ([A-Za-z0-9:]{6,9})<br />\\s+ (.*?)</td>\\s+"
+ "<td class=\"tableCell\">\\s+ ([a-z0-9*?:]{6,9}|[a-zA-Z\\s]{6,9})<br />\\s+ (.*?)</td>\\s+"
+ "<td class=\"tableCell\"> (.*?)\\(([A-Z]{3})\\)");
Matcher m = p.matcher(myResp);
if (m.find()) {
table.put("number", flightNum);
table.put("gate", m.group(2));
table.put("scheduled", m.group(3));
table.put("estimated", m.group(5));
table.put("destination", m.group(8));
return table;
}
} catch (Exception e) {
return null;
}
return null;
}
}
这是我的代码使用 AsyncTask 的样子。
public class FlightNumResults extends Activity {
public String flightNum;
public Hashtable<String, String> table;
@Override
protected void onCreate(Bundle savedInstanceState) {
Intent intent = getIntent();
flightNum = intent.getStringExtra("input"); // if it's a string you
// stored.
super.onCreate(savedInstanceState);
System.out.println("HULLO");
// System.out.println(value);
setContentView(R.layout.loading);
Log.i("Excecution", "Complete");
FlightInfo fi = new FlightInfo();
fi.execute();
fi.flightNumInfo(flightNum);
// Hashtable<String, String> table = fi.flightNumInfo(value);
// System.out.println(table.get("destination"));
// setContentView(R.layout.activity_flightnum_results);
}
public class FlightInfo extends AsyncTask<Void, Void, Void> {
public Socket conn;
public PrintWriter wr;
public DataInputStream dis;
public DataOutputStream dos;
@Override
protected Void doInBackground(Void... params) {
try {
conn = new Socket(InetAddress.getByName("www.delta.com"), 80);
}catch (Exception e){
Log.i("AsyncTank", "Can't create socket");
}
if (conn.isConnected()){
try {
dis = (DataInputStream)conn.getInputStream();
dos = (DataOutputStream)conn.getOutputStream();
Log.i("AsyncTank", "doInBackgoung: Socket created, Streams assigned");
} catch (IOException e) {
// TODO Auto-generated catch block
Log.i("AsyncTank", "doInBackgoung: Cannot assign Streams, Socket not connected");
e.printStackTrace();
}
} else {
Log.i("AsyncTank", "doInBackgoung: Cannot assign Streams, Socket is closed");
}
return null;
}
protected void onPostExecute(Boolean result) {
if (result) {
Log.i("AsyncTask", "onPostExecute: Completed with an Error.");
} else {
Log.i("AsyncTask", "onPostExecute: Completed.");
}
setContentView(R.layout.activity_flightnum_results);
}
public void flightNumInfo(String flightNum) {
table = new Hashtable<String, String>();
String request = "GET /flifo/servlet/DeltaFlifo?airline_code=DL&flight_number="
+ flightNum
+ "&flight_date="
+ DateCalc.getSlashDateAndTime()
+ "&request=main&DptText=ATL HTTP/1.1";
//Socket conn = new Socket(InetAddress.getByName("www.delta.com"), 80);
wr = new PrintWriter(dos);
wr.println(request);
wr.println("Host: www.delta.com");
wr.println("Referer: http://www.delta.com/flifo/servlet/DeltaFlifo?airline_code=DL&request=main");
wr.println("Connection: close\n");
wr.flush();
Scanner in = new Scanner(dis);
String myResp = new String();
String ans = new String();
do {
ans = in.nextLine();
myResp += ans;
} while (ans.indexOf("<span class=\"detailsLabel\"><br />") < 0);
wr.close();
in.close();
// System.out.println(myResp);
Pattern p = Pattern
.compile("<td class=\"tableCell\" align=\"left\"> \\s+Atlanta\\s+"
+ "<a href=\"/content/www/en_US/traveling-with-us/airports-and-aircraft/airports/atlanta.html\">"
+ "<!-- mp_trans_disable_start -->\\(ATL\\)<!-- mp_trans_disable_end --></a>\\s+<br /> (.*?)"
+ "<br /> Gate <!-- mp_trans_disable_start -->([A-Z0-9]{2,3})<!-- mp_trans_disable_end -->\\s+"
+ "</td>\\s+<td class=\"tableCell\">\\s+ ([A-Za-z0-9:]{6,9})<br />\\s+ (.*?)</td>\\s+"
+ "<td class=\"tableCell\">\\s+ ([a-z0-9*?:]{6,9}|[a-zA-Z\\s]{6,9})<br />\\s+ (.*?)</td>\\s+"
+ "<td class=\"tableCell\"> (.*?)\\(([A-Z]{3})\\)");
Matcher m = p.matcher(myResp);
if (m.find()) {
table.put("number", flightNum);
table.put("gate", m.group(2));
table.put("scheduled", m.group(3));
table.put("estimated", m.group(5));
table.put("destination", m.group(8));
}
}
}
}