public class GeoRetrieverService extends Service {
private Thread triggerService;
private final IBinder mBinder = new LocalBinder();
private Intent startingIntent;
@Override
public void onCreate()
{
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
@Override
public void onDestroy()
{
}
@Override
public int onStartCommand(final Intent intent,int flags,int startId)
{
Log.d("geoRetriever", "started geo retriever");
triggerService = new Thread(new Runnable() {
public void run() {
try{
//
String result = (connect("http://10.0.2.2:8080/GpsServ/GeoRetrieve")//,intent.getStringExtra("nearLeftLat"),
// intent.getStringExtra("nearLeftLng"),
// intent.getStringExtra("farRightLat"),
// intent.getStringExtra("farRightLng")
// )
);
Log.d("geoRetriever", result + " this should be result");
}
catch(Exception e)
{
e.printStackTrace();
}
}
//,String topLat,String topLng,String bottomLat,String bottomLng)
public String connect(String url)
{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httpget = new HttpPost(url);
HttpResponse response;
try {
response = httpclient.execute(httpget);
//Log.i(TAG,response.getStatusLine().toString());
HttpEntity entity = response.getEntity();
if (entity != null) {
InputStream instream = entity.getContent();
String result= convertStreamToString(instream);
instream.close();
return result;
}
} catch (ClientProtocolException e) {
} catch (IOException e) {
}
return null;
}
private String convertStreamToString(InputStream is) {
/*
* To convert the InputStream to String we use the BufferedReader.readLine()
* method. We iterate until the BufferedReader return null which means
* there's no more data to read. Each line will appended to a StringBuilder
* and returned as String.
*/
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}, "TrackRetrieverThread");
triggerService.start();
return START_STICKY;
}
public class LocalBinder extends Binder {
GeoRetrieverService getService() {
// Return this instance of LocalService so clients can call public methods
return GeoRetrieverService.this;
}
}
}
我从 MainActivity 开始这个课程。我确定服务开始了。从浏览器访问 URL 时，我得到了预期的数据。从调试器访问时，我得到空值。
我也尝试过使用 HttpGet 而不是 HttpPost。
服务器的结果是一个 json 字符串。
任何想法为什么我会得到空值？
编辑：它抛出一个
Connection to http://10.0.2.2:8080 refused.
我猜Tomcat正在断开连接。
我有
<uses-permission android:name="android.permission.INTERNET" />
在清单中。此外，服务器已启动，并在同一地址上响应（使用 localhost 而不是 10.0.2.2）
我不是在调试器内部进行测试，而是在连接到 USB 的设备上进行测试。