Internet connection not working if my App runs on a API 8 Emulator

Question

Hi and thanks for your help, I have an App which I compile against API 17 in Eclipse.

The App performs some simple internet connections.

Now, when I test on an Emulator with API 17 everything works fine.

If i test it against an Emulator with API 8 the App apparently is not able to perform network connections (adMob dos not show, HttpGet apparently not retrieving anything...) form my App (web browser on Emulator working fine and loading normally).

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And adMob as well does not load on Emulators with API 8 or 10 (it does on API 17 Emulators).

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Any help very much appreciated !!!

This is my main Activity:

public class QuotesActivity extends Activity implements MyInterface {

private String url2;

public static ArrayList<Stock> lt;
public static ArrayList<Stock> favQ;

public MyAdapter myAdap;

public Intent intent;
public ListView lv;
public FavManager fm;
private AdView adView;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.search);
    AdRequest request = new AdRequest();

    // request.addTestDevice(AdRequest.TEST_EMULATOR);
    request.setGender(AdRequest.Gender.MALE);
    boolean tabletSize = getResources().getBoolean(R.bool.isTablet);
    if (tabletSize) {
        // Create the adView
        adView = new AdView(this, AdSize.SMART_BANNER, "a151388079e47d1");
    } else {
        // Create the adView
        adView = new AdView(this, AdSize.BANNER, "a151388079e47d1");
    }

    // Lookup your LinearLayout assuming it's been given
    // the attribute android:id="@+id/mainLayout"
    LinearLayout layout = (LinearLayout) findViewById(R.id.ad);

    // Add the adView to it
    layout.addView(adView);

    // Initiate a generic request to load it with an ad
    adView.loadAd(request);

    lt = new ArrayList<Stock>();
    favQ = new ArrayList<Stock>();
    fm = new FavManager(getApplicationContext());
    favQ.clear();
    favQ.addAll(fm.ritiraFav());
    PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
    lt.clear();
    // ////////////
    try {
        InputStream in = getResources().openRawResource(R.raw.markets3);

        if (in != null) {
            InputStreamReader tmp = new InputStreamReader(in);
            BufferedReader reader = new BufferedReader(tmp);
            String str;
            String str1 = null;
            String str2 = null;
            boolean flag = true;
            while ((str = reader.readLine()) != null) {
                if (flag) {
                    str1 = str;
                    flag = false;
                } else {
                    str2 = str;
                    lt.add(new Stock(str1, str2, "0", "0"));
                    flag = true;
                }
            }
            in.close();
        }
    }

    catch (Throwable t) {
        // Log.e("", "Exception: " + t.toString());
    }
    // ///////
    Collections.sort(lt, new Comparator<Stock>() {
        public int compare(Stock s1, Stock s2) {
            return s1.nome.compareToIgnoreCase(s2.nome);
        }
    });
    lv = (ListView) findViewById(android.R.id.list);
    lv.setScrollbarFadingEnabled(false);
    Button favourites = (Button) findViewById(R.id.favoritesbtn);
    favourites.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent intent = new Intent(QuotesActivity.this,
                    QuotesActivityFavourites.class);
            startActivity(intent);

        }
    });

    Button search = (Button) findViewById(R.id.googsearch);
    search.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // Log.e("", "Chiamo onSearchRequested()");
            onSearchRequested();

        }
    });

    myAdap = new MyAdapter(lt, this, this);
    myAdap.l = lt;
    lv.setAdapter(myAdap);

    Button preference = (Button) findViewById(R.id.preferencebutton);
    preference.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent intent = new Intent(QuotesActivity.this,
                    SettingsActivity.class);
            startActivity(intent);

        }
    });

    lv.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> parent, View view,
                final int position, long id) {
            for (Stock item : favQ) {
                if (item.simbolo.equals(lt.get(position).simbolo)) {
                    AlertDialog.Builder builder = new AlertDialog.Builder(
                            QuotesActivity.this);
                    builder.setPositiveButton("Yes", new OnClickListener() {
                        public void onClick(DialogInterface arg0, int arg1) {
                            deleteFromFavorites(lt.get(position));
                        }
                    });
                    builder.setNegativeButton("No", new OnClickListener() {
                        public void onClick(DialogInterface arg0, int arg1) {
                            // Quotes.layoutSchermo(2);
                        }
                    });
                    builder.setMessage("Stock Already in Portfolio. Delete from it?");
                    builder.setTitle(lt.get(position).nome);

                    AlertDialog dialog = builder.create();
                    builder.show();
                    return;
                }

            }

            AlertDialog.Builder builder = new AlertDialog.Builder(
                    QuotesActivity.this);
            final int pos = position;

            builder.setPositiveButton("Yes", new OnClickListener() {
                public void onClick(DialogInterface arg0, int arg1) {
                    addToFavorites(lt.get(pos));
                }
            });
            builder.setNegativeButton("No", new OnClickListener() {
                public void onClick(DialogInterface arg0, int arg1) {
                    // Quotes.layoutSchermo(2);
                }
            });
            builder.setMessage("Add to Portfolio?");
            builder.setTitle(lt.get(position).nome);
            AlertDialog dialog = builder.create();
            builder.show();
            // dialog.show();
        }
    });

}

@Override
public void onResume() {
    super.onResume();
    RelativeLayout focuslayout = (RelativeLayout) findViewById(R.id.RequestFocusLayout);
    focuslayout.requestFocus();
    favQ.clear();
    favQ.addAll(fm.ritiraFav());
}

public void addToFavorites(final Stock toadd) {

    fm.addFav(toadd);
    favQ.clear();
    favQ.addAll(fm.ritiraFav());
    return;
}

public void deleteFromFavorites(Stock todel) {
    fm.removeFav(todel);
    favQ.clear();
    favQ.addAll(fm.ritiraFav());
    return;
}

public void UpdateLine(Integer position) {
    UpdateTask up = new UpdateTask();
    up.execute(position, null, null);
}

public class UpdateTask extends AsyncTask<Integer, Void, Void> {

    @Override
    protected void onProgressUpdate(Void... progress) {
    }

    @Override
    protected void onPostExecute(Void result) {
        myAdap.l = lt;
        myAdap.notifyDataSetChanged();
    }

    @Override
    protected Void doInBackground(Integer... position) {
        DefaultHttpClient client = new DefaultHttpClient();
        String srt = "";
        // ///////////API SEGRETO DI GOOGLE ORIGINARIO
        // String url
        // =getString(R.string.dettaglio1).concat("'"+fav.get(i).simbolo+"'").concat(getString(R.string.dettaglio2));
        // ///////////API ALTERNATIVO
        String url = getString(R.string.urlaternativo).concat(
                lt.get(position[0]).simbolo);

        HttpGet getMethod = new HttpGet(url);
        try {
            ResponseHandler<String> responseHandler = new BasicResponseHandler();
            srt = client.execute(getMethod, responseHandler);
            int inizio = srt.indexOf("<last data=\"");
            int fine = srt.indexOf("\"/>", inizio + 12);
            lt.get(position[0]).setPrezzo(srt.substring(inizio + 12, fine));

            inizio = srt.indexOf("<perc_change data=\"");
            fine = srt.indexOf("\"/>", inizio + 19);
            lt.get(position[0]).setCambiamento(
                    srt.substring(inizio + 19, fine));

        } catch (Throwable t) {
            // Log.e("ERRORE INTERNET", "ERRORE INTERNET", t);
        }

        return null;
    }
}

@Override
public void onDestroy() {
    if (adView != null) {
        adView.destroy();
    }
    super.onDestroy();
}
}

This is my Manifest:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.quotes" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="17" />

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<application android:debuggable="true" >
    <activity
        android:name=".QuotesActivity"
        android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
        android:icon="@drawable/ic_launcher"
        android:label="Markets in your pocket !" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>

        <meta-data
            android:name="android.app.default_searchable"
            android:value=".QuotesActivitySearch" />
    </activity>
    <activity
        android:name=".QuotesActivitySearch"
        android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
        android:icon="@drawable/ic_launcher"
        android:label="Markets in your pocket !" >
        <intent-filter>
            <action android:name="android.intent.action.SEARCH" />
        </intent-filter>

        <meta-data
            android:name="android.app.searchable"
            android:resource="@xml/searchable" />
    </activity>
    <activity
        android:name=".QuotesActivityFavourites"
        android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
        android:icon="@drawable/ic_launcher"
        android:label="Markets in your pocket !" >
    </activity>
    <activity
        android:name=".SettingsActivity"
        android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
        android:label="Settings" >
    </activity>
    <activity
        android:name="com.google.ads.AdActivity"
        android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize" />
</application>

This is my LogCat:

03-15 14:16:05.554: D/dalvikvm(1466): GC_EXPLICIT freed 909K, 43% free 4716K/8135K,    external 1170K/1682K, paused 7ms
03-15 14:16:07.185: E/ActivityThread(1466): Failed to find provider info for    com.google.plus.platform
03-15 14:16:07.185: D/szipinf(1466): Initializing inflate state
03-15 14:16:07.185: D/szipinf(1466): Initializing zlib to inflate
03-15 14:16:07.214: I/Ads(1466): To get test ads on this device, call    adRequest.addTestDevice("6EA1DCF3A944D7B947BC304C7A9E933D");
03-15 14:16:07.268: D/dalvikvm(1466): GC_CONCURRENT freed 395K, 36% free 5315K/8263K,    external 1121K/1603K, paused 1ms+0ms
03-15 14:16:07.290: I/Ads(1466): adRequestUrlHtml: <html><head><script     src="http://media.admob.com/sdk-core-v40.js"></script>   <script>AFMA_getSdkConstants();AFMA_buildAdURL({"preqs":3,"session_id":"1145804483122245265 2","seq_num":"4","slotname":"a151388079e47d1","u_w":320,"msid":"com.marketsinyourpocket","cap":"m,a","js":"afma-sdk-a-    v6.3.0","bas_off":0,"net":"ed","app_name":"1.android.com.marketsinyourpocket","hl":"en","gnt":3,"cust_gender":1,"carrier":"310260","u_audio":1,"u_sd":1.5,"ms":"Qqlgt9Kwv7BZOnio6PfLHi5mVs5ayp77VGIIyJ3Y7sojTNwIZfi0LHn2PZquoJTqpJx8NtOvTzGKWYlbxvU8fOjXkArCoqoQnGrLKZ57CTZOOt2WWrL9k8pyN4P-nBwIvuZDvijR0reHDyhcqwAoMtPdOeUV_cwIe3jk-6BMm_IgvGs8EKWVZESeqrSuExAStQMMsUYcC6p-XkB8KegxEX4FS2Q2CibdMk3CMKoAzfF58Sxp6DvRObm662IVwImzFWGdQ22UVx4ViQqz_ensdg1bXk5jgpyBOpV0jMFHgoEv5SwD5zpoeJfo-a1f0d5GR35f2bDAb3iXucuGB723lA","isu":"6EA1DCF3A944D7B947BC304C7A9E933D","format":"320x50_mb","oar":0,"ad_pos":{"height":0,"visible":0,"y":0,"x":0,"width":0},"u_h":533,"pt":1,"bas_on":0,"ptime":143736});</script></head><body></body></html>
03-15 14:16:07.358: W/webcore(1466): Can't get the viewWidth after the first layout
03-15 14:16:07.448: D/dalvikvm(1466): GC_CONCURRENT freed 338K, 33% free 6141K/9031K,  external 1121K/1603K, paused 1ms+0ms
03-15 14:16:13.494: V/URL I USE(1466): http://www.google.com/ig/api?stock=SHY
03-15 14:16:33.614: E/EXCEPTION I GET(1466): java.net.UnknownHostException: www.google.com

EDIT EDIT EDIT EDIT

Tried even on a API 10 Intel accelerated Emulator, with no better luck

Proxy is set correctly,

data transfer is enabled

...I am a bit desperate!

EDIT EDIT EDIT

Posted the entire Activity

EDIT EDIT EDIT

The app works correctly on a real telephone with API 10 (not on my Emulator with API 10)!!!

The error I catch is

03-15 13:14:43.299: E/Exception(1318): java.net.UnknownHostException: www.google.com

indeed I use a Google REST Service

Thanks for your help!

Answer 1

I'm pretty sure it's a proxy settings issue. Try explicit setting the proxy (obtain the values from Android System).

On a default HttpClient this would be:

HttpClient client = new DefaultHttpClient();

//Get the default settings from APN
  String proxyHost = android.net.Proxy.getDefaultHost();
  int proxyPort = android.net.Proxy.getDefaultPort();
//Set Proxy params of client, if they are not the standard
    if (proxyHost != null && proxyPort > 0) {
        HttpHost proxy = new HttpHost(proxyHost, proxyPort);
        client.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);
    }
HttpGet request = new HttpGet("http://www.google.com");

Answer 2

Maybe internet is turned off in the emulator? There should be a little 3G icon at the top of it, try clicking F8, it turns it on and off.

Answer 3

Guesses:

• "Proxy is set correctly" Try it without setting any proxy.
• try using another cpu instead of the intel atom

Answer 4

Since network access works with the AVD's browser, I'd focus on other potential sources of the problem.

If I were you, I'd simply try to compile against API 8. When you do that, you will be pointed towards any methods and other constructs you use in your code which are not available for API 8. (You haven't provided all code, e.g. there could be something hidden in MyAdapter. Also, you haven't mentioned whether or not your catch log message appears in the LogCat.)

The other aspect which may be worth looking at is that you're not using AsyncTask correctly, and it's going to behave differently on different API versions.

Depending on the API version, when you do not choose the Executor explicitly, your AsyncTasks will either run sequentially or in parallel, resulting in many or few http connections and also resulting in concurrent manipulation of your data structure.

You may manipulate your Adapter only on the main/UI thread. Otherwise, e.g. when the user scrolls through your list, the UI will call your adapter's getView() which may be interrupted by your AsyncTask modifying the very entry which is currently being processed by getView(), resulting in inconsistencies and/or crash.

You have tried to achieve this by manipulating lt asynchronously and calling myAdap.l = lt on the UI thread.

This is a nice idea, but it has two problems. First, on API 8, many AsyncTasks can run in parallel, while on API 17 it will only be one. Qoute:

Starting with DONUT, this was changed to a pool of threads allowing multiple tasks to operate in parallel. Starting with HONEYCOMB, tasks are executed on a single thread to avoid common application errors caused by parallel execution.

So on some versions of Android, you would encounter a race condition by which copies of lt would be manipulated in parallel, resulting in data loss upon the assignment. If those were actual copies, that is -- they aren't. By manipulating lt asynchronously while it is already assigned as the underlying data structure of your Adapter, you're breaking the rule of not manipulating UI objects asynchronously.

So you'll need to pass the fetched data from doInBackground to onPostExecute and update your Adapter's data structure there.

The two points I mentioned may not be the final cause of the problem but they could very well contribute to the observed behaviour, need to be addressed anyway and will make it easier to identify any other potentail root cause.

Hope this helps.

Update You may also be using the HttpClient in a wrong way. See for example here. Maybe not all combinations are (correctly) supported for all API levels (there were several bugs in the past). You may also want to read Android’s HTTP Clients.

Answer 5

If you are developing in eclipse, you can try

Window>Preferences>Android>Launch

Default emulator options: -dns-server 8.8.8.8,8.8.4.4

EDIT:

goto: run->run configuration-> android application

then select your project -> target, scroll down options page and paste -dns-server 8.8.8.8,8.8.4.4 to Additional Emulator Command Line Options