这是我项目中的MainActivity（仅限活动）（FSM，我知道）
public class MainActivity extends Activity {
private static final String DEBUG_TAG = "HttpExample";
private static final String MYURL = "http://www.myserver.com/myapp/usertable.php";
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//initialize the textview
textView = (TextView) findViewById(R.id.hello_world);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
//Check connectivity
ConnectivityManager connMgr = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected()) {
//fetch data
new DownloadWebpageTask().execute(MYURL);
textView.setText("Fetching data");
} else {
//show error
textView.setText("No network connection available.");
}
}
private class DownloadWebpageTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
// params comes from the execute() call: params[0] is the url.
try {
return downloadUrl(urls[0]);
} catch (IOException e) {
return "Unable to retrieve web page. URL may be invalid.";
}
}
// onPostExecute displays the results of the AsyncTask.
@Override
protected void onPostExecute(String result) {
textView.setText(result);
textView.setMovementMethod(new ScrollingMovementMethod());
}
}
//Method to convert url to url object
private String downloadUrl(String myurl) throws IOException {
InputStream is = null;
// Only display the first 500 characters of the retrieved
// web page content.
int len = 16*1024; //Try 16*1024
String username;
String password;
String email;
try {
URL url = new URL(myurl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("GET");
conn.setDoInput(true);
// Starts the query
conn.connect();
int response = conn.getResponseCode();
Log.d(DEBUG_TAG, "The response is: " + response);
is = conn.getInputStream();
// Convert the InputStream into a string
String contentAsString = readIt(is, len);
Log.d(DEBUG_TAG, "The data is: " + contentAsString);
try {
//Get master array of locations
Log.d(DEBUG_TAG, "BEFORE JSONArray: " + contentAsString);
JSONArray jsonArray = new JSONArray(contentAsString);
Log.d(DEBUG_TAG, "AFTER JSONArray: " + contentAsString);
//Loop through each dictionary in array
for (int i = 0; i < jsonArray.length(); i++) {
//test array contents
//String strToPrint = "jsonArray[" + i + "]=" + jsonArray[i];
//Get the lat&long for
JSONObject someData = jsonArray.getJSONObject(i);
System.out.println(i + " id : " + someData.getString("id"));
System.out.println(i + " user : " + someData.getString("username"));
System.out.println(i + " email : " + someData.getString("email"));
//username = sys.getString("username");
//email = sys.getString("email");
//password = sys.getString("password");
//Create location object
// Use Location.distanceTo() - creates list of distances to users current location
//add distance to array?
}
//Sort and get nearest 5 locations
//better use Mirror API
} catch (Exception e) {
// TODO Auto-generated catch block
System.out.println("trycatch" );
e.printStackTrace();
}
return contentAsString;
// Makes sure that the InputStream is closed after the app is
// finished using it.
} finally {
if (is != null) {
is.close();
}
}
}
//Get distances
public float distanceTo (Location dest) {
//Compare distance passed to user location
//return distance float
return 1;
}
//Convert input stream to string
// Reads an InputStream and converts it to a String.
public String readIt(InputStream stream, int len) throws IOException, UnsupportedEncodingException {
Reader reader = null;
reader = new InputStreamReader(stream, "UTF-8");
char[] buffer = new char[len];
reader.read(buffer);
return new String(buffer);
}
这是打印的最终结果，因为数据是：在一长串正确字符的末尾：
， “电子邮件”：“乔
服务器响应实际上是：
， “电子邮件”： “John.e.Francois@someserver.com”
以下是服务器结果的示例：
[{"id":"36","username":"Simulor","password":"0457e576192406775e574c2555e2edc6","password_hint":"","last name":"","first name":"","email":"info@hey.com","phone":"","address1":"","address2":"","city":"","state":"","zip":"","country":"","url":"","permissions":"1","udid":"9","userCreated":"2013-06-29 17:51:40","time_queued":null,"time_sent":null},
{"id":"35","username":"zlitsami ","password":"932d1c42a4e4880e57037994fd3584b1","password_hint":"","last name":"","first name":"","email":"sami@yahoo.com","phone":"","address1":"","address2":"","city":"","state":"","zip":"","country":"","url":"","permissions":"1","idid":"9","userCreated":"2013-01-01 14:27:22","time_queued":null,"time_sent":null},{"id":"34","username":"Probate","password":"5fbba4aa93a00a9d75b19a3b7f9249bd","password_hint":"","last name":"","first name":"","email":"info@google.com","phone":"","address1":"","address2":"","city":"","state":"","zip":"","country":"","url":"","permissions":"1","udid":"9","userCreated":"2012-06-15 12:17:53","time_queued":null,"time_sent":null},{"id":"4","username":"carSim","password":"2d157441e6f311d0a5c8a5cbe2fd6f06","password_hint":"","lastname":"","firstname":"","email":"info@compusa.com","phone":"","address1":"","address2":"","city":"","state":"","zip":"","country":"","url":"","permissions":"1","udid":"F6869FB4-2EBE-5D43-A62D-5D4007646764","userCreated":"0000-00-00 00:00:00","time_queued":null,"time_sent":"2011-06-24 11:59:23"},{"id":"33","username":"Test","password":"68eacb97d86f0c4621fa2b0e17cabd8c","password_hint":"","lastname":"","firstname":"","email":"info@openerp.com","phone":"","address1":"","address2":"","city":"","state":"","zip":"","country":"","url":"","permissions":"1","udid":"9","userCreated":"2012-06-15 12:03:49","time_queued":null,"time_sent":null},{"id":"6","username":"danni","password":"6d1ab84bf937dde5ef7d738f97b44314","password_hint":"","lastname":"","firstname":"","email":"jodri40@hotmail.com","phone":"","address1":"","address2":"","city":"","state":"","zip":"","country":"","url":"","permissions":"1","udid":"36e83a379985ce9e485fdbd2d94d2c835f869b1c","userCreated":"0000-00-00 00:00:00","time_queued":null,"time_sent":"2011-06-24 11:59:23"},{"id":"7","username":"janevm","password":"da80a7e5f20f7dd56370dba9305155ef","password_hint":"","lastname":"","firstname":"","email":"cats5@hotmail.com","phone":"","address1":"","address2":"","city":"","state":"","zip":"","country":"","url":"","permissions":"1","udid":"adead80b9f8426ff4c20b38f4aa8cca9ab75e383","userCreated":"0000-00-00 00:00:00","time_queued":null,"time_sent":"2011-06-24 11:59:23"},{"id":"8","username":"JohnFranks","password":"3cc5f0b88d4cf16008ed8f63c88ddcb0","password_hint":"","lastname":"","firstname":"","email":"John.e.Francois@somerserver.com","phone":"","address1":"","address2":"","city":"","state":"","zip":"","country":"","url":"","permissions":"1","idid":"9950b4a6189f338eb68b38bd76745ef6a6d932f1","userCreated":"0000-00-00 00:00:00","time_queued":null,"time_sent":"2011-06-24 11:59:23"}
]
什么可能导致那些奇怪的人物？它们仅在我将Stream的int len设为此大小（16 * 1024）时才会出现。最初它只有500.但为什么我甚至需要指定一定数量的字符才能返回？
为什么应用程序永远不会超过JSONArray jsonArray = new JSONArray（contentAsString）;线？
我可以使用JSON编码的数组，并将其直接放入java中的数组吗？
答案 0 :(得分：1)
当id，username和email的值是字符串时，为什么要调用someData.getInt（）/ sameData.getDouble（）？你应该改为调用someData.getString（）。
答案 1 :(得分：0)
您是否可以提供您的网络服务网址，以便我可以使用我的代码进行测试？
请为用户更改getDouble和＆amp;电子邮件的getBoolean为getString，如下所示：
System.out.println(i + " user : " + someData.getString("username"));
System.out.println(i + " email : " + someData.getString("email"));
答案 2 :(得分：0)
我将读取InputStream的方法替换为：
public String readIt(InputStream stream, int len) throws IOException, UnsupportedEncodingException {
StringBuilder builder = new StringBuilder();
BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
//New code to convert InputStream to String
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
return builder.toString();
}
现在有效。