我有一个从我的服务器（在线）获取信息的应用程序，我的计算机中有该网站的版本（localhost），
应用程序正在使用localhost可以获取json，但我无法访问服务器上的网站。
public class MainActivity extends Activity {
EditText etResponse;
TextView tvIsConnected;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// get reference to the views
etResponse = (EditText) findViewById(R.id.etResponse);
tvIsConnected = (TextView) findViewById(R.id.tvIsConnected);
// check if you are connected or not
if(isConnected()){
tvIsConnected.setBackgroundColor(0xFF00CC00);
// tvIsConnected.setText("You are conncted");
}
else{
tvIsConnected.setText("You are NOT conncted");
}
// call AsynTask to perform network operation on separate thread
new HttpAsyncTask().execute("http://alarbaeen.com/app/?a=gallery&b=images&c=new&d=1");
}
public static String GET(String url){
Log.i("hamid", "1111111111111");
InputStream inputStream = null;
String result = "";
try {
Log.i("hamid", "222222222222");
HttpClient httpclient = new DefaultHttpClient();
Log.i("hamid", "333333333333333333");
HttpResponse httpResponse = httpclient.execute(new HttpGet(url));
Log.i("hamid", "44444444444444444");
// receive response as inputStream
inputStream = httpResponse.getEntity().getContent();
Log.i("hamid", "55555555555555");
// convert inputstream to string
if(inputStream != null)
result = convertInputStreamToString(inputStream);
else
result = "Did not work!";
} catch (Exception e) {
Log.d("InputStream", e.getLocalizedMessage());
}
return result;
}
private static String convertInputStreamToString(InputStream inputStream) throws IOException{
BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(inputStream));
String line = "";
String result = "";
while((line = bufferedReader.readLine()) != null)
result += line;
inputStream.close();
return result;
}
public boolean isConnected(){
ConnectivityManager connMgr = (ConnectivityManager) getSystemService(Activity.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected())
return true;
else
return false;
}
private class HttpAsyncTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
return GET(urls[0]);
}
// onPostExecute displays the results of the AsyncTask.
@Override
protected void onPostExecute(String result) {
Toast.makeText(getBaseContext(), "Received!", Toast.LENGTH_LONG).show();
etResponse.setText(result);
}
}
这些是错误：
03-12 11:45:38.704: I/hamid(4005): 1111111111111
03-12 11:45:38.704: I/hamid(4005): 222222222222
03-12 11:45:38.704: I/hamid(4005): 333333333333333333
03-12 11:45:39.524: I/PGA(4005): Attempting to create new SOCKET connectionn pid = 4005, tid = 4005
03-12 11:45:39.534: I/PGA(4005): New SOCKET connection: com.example.testjsons22 (pid 4005, tid 4005)
03-12 11:45:39.534: W/dalvikvm(4005): threadid=11: thread exiting with uncaught exception (group=0x95d67b20)
03-12 11:45:39.534: I/Process(4005): Sending signal. PID: 4005 SIG: 9
03-12 11:45:39.534: D/AndroidRuntime(4005): procName from cmdline: com.example.testjsons22
03-12 11:45:39.534: E/AndroidRuntime(4005): in writeCrashedAppName, pkgName :com.example.testjsons22
03-12 11:45:39.534: D/AndroidRuntime(4005): file written successfully with content: com.example.testjsons22 StringBuffer : ;com.example.testjsons22
03-12 11:45:39.534: E/AndroidRuntime(4005): FATAL EXCEPTION: AsyncTask #1
03-12 11:45:39.534: E/AndroidRuntime(4005): Process: com.example.testjsons22, PID: 4005
03-12 11:45:39.534: E/AndroidRuntime(4005): java.lang.RuntimeException: An error occured while executing doInBackground()
03-12 11:45:39.534: E/AndroidRuntime(4005): at android.os.AsyncTask$3.done(AsyncTask.java:300)
03-12 11:45:39.534: E/AndroidRuntime(4005): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
03-12 11:45:39.534: E/AndroidRuntime(4005): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
03-12 11:45:39.534: E/AndroidRuntime(4005): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
03-12 11:45:39.534: E/AndroidRuntime(4005): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
03-12 11:45:39.534: E/AndroidRuntime(4005): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
03-12 11:45:39.534: E/AndroidRuntime(4005): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
03-12 11:45:39.534: E/AndroidRuntime(4005): at java.lang.Thread.run(Thread.java:841)
03-12 11:45:39.534: E/AndroidRuntime(4005): Caused by: java.lang.NullPointerException: println needs a message
03-12 11:45:39.534: E/AndroidRuntime(4005): at android.util.Log.println_native(Native Method)
03-12 11:45:39.534: E/AndroidRuntime(4005): at android.util.Log.d(Log.java:139)
03-12 11:45:39.534: E/AndroidRuntime(4005): at com.example.testjsons22.MainActivity.GET(MainActivity.java:78)
03-12 11:45:39.534: E/AndroidRuntime(4005): at com.example.testjsons22.MainActivity$HttpAsyncTask.doInBackground(MainActivity.java:108)
03-12 11:45:39.534: E/AndroidRuntime(4005): at com.example.testjsons22.MainActivity$HttpAsyncTask.doInBackground(MainActivity.java:1)
03-12 11:45:39.534: E/AndroidRuntime(4005): at android.os.AsyncTask$2.call(AsyncTask.java:288)
03-12 11:45:39.534: E/AndroidRuntime(4005): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
03-12 11:45:39.534: E/AndroidRuntime(4005): ... 4 more
注意：此程序适用于所有主机和服务器，我认为问题来自我的服务器。 （也许）