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private static final String ENCODING = "UTF-8"; private static final String URL_BASE = "http://ajax.googleapis.com/ajax/services/language/translate v=1.0&langpair="; private static final String INPUT_TEXT = "&q="; private static final String MY_SITE = "http://my.website.com"; private static final String TAG = "Translator"; public static String translate(String text, String from, String to) throws Exception { try { StringBuilder url = new StringBuilder(); url.append(URL_BASE).append(from).append("%7C").append(to); url.append(INPUT_TEXT).append(URLEncoder.encode(text, ENCODING)); HttpURLConnection conn = (HttpURLConnection) new URL(url.toString()) .openConnection(); conn.setRequestProperty("REFERER", MY_SITE); conn.setDoInput(true); conn.setDoOutput(true); try { InputStream is= conn.getInputStream(); String rawResult = makeResult(is); JSONObject json = new JSONObject(rawResult); String result = ((JSONObject)json.get("responseData")) .getString("translatedText"); return (StringEscapeUtils.unescapeXml(result)); } finally { conn.getInputStream().close(); if(conn.getErrorStream() != null) conn.getErrorStream().close(); } } catch (Exception ex) { throw ex; } } private static String makeResult(InputStream inputStream) throws Exception { StringBuilder outputString = new StringBuilder(); try { String string; if (inputStream != null) { BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, ENCODING)); while (null != (string = reader.readLine())) { outputString.append(string).append('\n'); } } } catch (Exception ex) { Log.e(TAG, "Error reading translation stream.", ex); } return outputString.toString(); } }

The Translator class is where the meat is in this sample application. Basically, it creates an HTTP call to the Google AJAX Language API service, then reads the response. We ll get into the details a little later, but first, let s finish creating our sample application so you can try it out. Next up in Listing 15 9 is the Java code for our MainActivity.

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<RadioButton android:id="@+id/chRBtn" android:text="Chicken" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <RadioButton android:id="@+id/fishRBtn" android:text="Fish" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <RadioButton android:id="@+id/stkRBtn" android:text="Steak" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <TextView android:text="My Favorite" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </RadioGroup> </LinearLayout> Listing 4-16 shows that you can have non-RadioButton controls inside a radio group. Moreover, you should know that the radio group can enforce single-selection only on the radio buttons within its own container. That is, the radio button with ID anotherRadBtn will not be affected by the radio group shown in Listing 4-16 because it is not one of the group s children. Also know that you can manipulate the RadioGroup programmatically. For example, you can obtain a reference to a radio group programmatically and add a radio button (or other type of control): RadioGroup rdgrp = (RadioGroup)findViewById(R.id.rdGrp); RadioButton newRadioBtn = new RadioButton(this); newRadioBtn.setText("Pork"); rdgrp.addView(newRadioBtn);

The basic handling of all exceptions in OCaml is the try with block. It is important to remember that exceptions do not free your functions from returning the same type. If a function normally returns a string, it cannot return an integer (int) from an exception. The function can raise an exception, however, and you can continue to process things from there. try raise Not_found with Not_found -> Printf.printf "Hello!\n" Hello! - : unit = () # The preceding code doesn t really do anything, although it does illustrate how exceptions are raised and dealt with. You used exceptions in previous chapters and now you will understand them more clearly. Exceptions use pattern matching, too (in fact, the with clause uses pattern matching). However, exceptions are designed for handling exceptional situations, which are situations that should not happen. For example, if you have a function that is designed to divide two numbers, you want to know whether the denominator is a zero. You can check that explicitly by using an if statement or some other control. In OCaml, however, you do not have to you can wrap the calculation in a try with block, knowing that an exception will be thrown. Dividing by zero is a pretty simple situation, and often what is or is not exceptional is left to the programmer s discretion.

Listing 15 9. Java Code for our MainActivity // This file is MainActivity.java import android.app.Activity; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.os.Bundle; import android.os.Handler; import android.os.IBinder; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.Spinner; import android.widget.TextView; public class MainActivity extends Activity implements OnClickListener { static final String TAG = "Translator"; private EditText inputText = null; private TextView outputText = null; private Spinner fromLang = null; private Spinner toLang = null; private Button translateBtn = null; private String[] langShortNames = null; private Handler mHandler = new Handler(); private ITranslate mTranslateService; private ServiceConnection mTranslateConn = new ServiceConnection() { public void onServiceConnected(ComponentName name, IBinder service) { mTranslateService = ITranslate.Stub.asInterface(service); if (mTranslateService != null) { translateBtn.setEnabled(true); } else { translateBtn.setEnabled(false); Log.e(TAG, "Unable to acquire TranslateService"); } } public void onServiceDisconnected(ComponentName name) { translateBtn.setEnabled(false); mTranslateService = null; } }; @Override protected void onCreate(Bundle icicle) { super.onCreate(icicle);

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