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POAndroid app on real device,crashes when try connecting to server
 

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  1. POAndroid app on real device,crashes when try connecting to server
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    <p>I am trying to run a simple android code on my real device but it keeps crashing, it works fine on emulator.</p> <p>my code is </p> <pre><code> package com.example.new1; import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import android.os.AsyncTask; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.View; import android.widget.TextView; public class MainActivity extends Activity { TextView tx; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tx= (TextView)findViewById(R.id.text); } public void func(View view) { //tx.setText("Working fine till here."); new FetchSQL().execute(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; } private class FetchSQL extends AsyncTask&lt;String,Void,String&gt; { @Override protected String doInBackground(String... arg0) { URL url = null; BufferedReader reader = null; StringBuilder stringBuilder; String myUrl = "http://10.22.35.4:80/conc2.php"; try { url =new URL(myUrl); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setRequestMethod("GET"); connection.setReadTimeout(15*10000); connection.connect(); reader = new BufferedReader(new InputStreamReader(connection.getInputStream())); stringBuilder = new StringBuilder(); String line = null; while ((line = reader.readLine()) != null) { stringBuilder.append(line + "\n"); } // TODO Auto-generated method stub return stringBuilder.toString(); } catch(Exception e) { tx.setText(e.toString()); } return null; } protected void onPostExecute(String result) { tx.setText(result); } } } </code></pre> <p>it works fine on emulator , the output it gives </p> <blockquote> <p>V. M. ARORADr. C. P. REDDYARTI CHOWDHARYJAGDISH SINGH but on running same on my device. it gives following error code.</p> </blockquote> <pre><code>05-03 11:49:39.002: E/AndroidRuntime(19934): FATAL EXCEPTION: AsyncTask #1 05-03 11:49:39.002: E/AndroidRuntime(19934): java.lang.RuntimeException: An error occured while executing doInBackground() 05-03 11:49:39.002: E/AndroidRuntime(19934): at android.os.AsyncTask$3.done(AsyncTask.java:200) 05-03 11:49:39.002: E/AndroidRuntime(19934): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 05-03 11:49:39.002: E/AndroidRuntime(19934): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 05-03 11:49:39.002: E/AndroidRuntime(19934): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 05-03 11:49:39.002: E/AndroidRuntime(19934): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 05-03 11:49:39.002: E/AndroidRuntime(19934): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068) 05-03 11:49:39.002: E/AndroidRuntime(19934): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561) 05-03 11:49:39.002: E/AndroidRuntime(19934): at java.lang.Thread.run(Thread.java:1096) 05-03 11:49:39.002: E/AndroidRuntime(19934): Caused by: android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. 05-03 11:49:39.002: E/AndroidRuntime(19934): at android.view.ViewRoot.checkThread(ViewRoot.java:2811) 05-03 11:49:39.002: E/AndroidRuntime(19934): at android.view.ViewRoot.requestLayout(ViewRoot.java:594) 05-03 11:49:39.002: E/AndroidRuntime(19934): at android.view.View.requestLayout(View.java:8180) 05-03 11:49:39.002: E/AndroidRuntime(19934): at android.view.View.requestLayout(View.java:8180) 05-03 11:49:39.002: E/AndroidRuntime(19934): at android.view.View.requestLayout(View.java:8180) 05-03 11:49:39.002: E/AndroidRuntime(19934): at android.view.View.requestLayout(View.java:8180) 05-03 11:49:39.002: E/AndroidRuntime(19934): at android.widget.RelativeLayout.requestLayout(RelativeLayout.java:257) 05-03 11:49:39.002: E/AndroidRuntime(19934): at android.view.View.requestLayout(View.java:8180) 05-03 11:49:39.002: E/AndroidRuntime(19934): at android.widget.TextView.checkForRelayout(TextView.java:5383) 05-03 11:49:39.002: E/AndroidRuntime(19934): at android.widget.TextView.setText(TextView.java:2688) 05-03 11:49:39.002: E/AndroidRuntime(19934): at android.widget.TextView.setText(TextView.java:2556) 05-03 11:49:39.002: E/AndroidRuntime(19934): at android.widget.TextView.setText(TextView.java:2531) 05-03 11:49:39.002: E/AndroidRuntime(19934): at com.example.new1.MainActivity$FetchSQL.doInBackground(MainActivity.java:66) 05-03 11:49:39.002: E/AndroidRuntime(19934): at com.example.new1.MainActivity$FetchSQL.doInBackground(MainActivity.java:1) 05-03 11:49:39.002: E/AndroidRuntime(19934): at android.os.AsyncTask$2.call(AsyncTask.java:185) 05-03 11:49:39.002: E/AndroidRuntime(19934): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 05-03 11:49:39.002: E/AndroidRuntime(19934): ... 4 more </code></pre> <p>please help, how to run this stupid code on my real device. ive got my device </p> <blockquote> <p>GTI-9003 , ANDROID 2.2.1 (FROYO).. AND IN THIS APP I'VE PUT MIN SDK ..OF 1.5(CUPCAKE).</p> </blockquote>
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    2. COComment the line `tx.setText(e.toString());` inside the `doInBackground()` method, and post the logcat output again.
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    3. COMay be you could update your question with the actual log.
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      1. USAshwin
 

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