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Os. package; android. view. *; android. view. View. OnClickListener; android. widget. *; public category MyHelloWorldActivity extends job implements OnClickListener { /** referred to as whilst the task is first created. */ @Override public void onCreate(Bundle savedInstanceState) { great. onCreate(savedInstanceState); // initialize the UI... setContentView(R. format. main); // twine up a the button... Button button = this. getButton(); button. setOnClickListener(this); } fifty two CHAPTER four ■ ANDROID: fitting THE TOOLSET deepest Button getButton() { go back (Button)findViewById(R. identification. buttonGo); } public void onClick(View v) { if(v. getId() == R. identification. buttonGo) { // that is our cue... MessageBox. Show(this, "Hello, global! "); } } } That code won’t paintings till we construct the MessageBox classification. We’ll construct this right here, yet we’ll additionally use it in later chapters. Android has a category that might show message containers, yet there is not any shorthand approach to easily construct and exhibit a message field. upload this category for your undertaking: package deal amxMobile. Android. HelloWorld; import android. app. *; import android. content material. *; public category MessageBox { public static void Show(Activity proprietor, String message) { AlertDialog. Builder builder = new AlertDialog. Builder(owner); builder. setTitle(R. string. app_name); builder. setMessage(message); builder. setPositiveButton("OK", new DialogInterface. OnClickListener() { public void onClick(DialogInterface conversation, int whichButton) { // do anything here.. } }); // show... AlertDialog conversation = builder. create(); conversation. show(); } } ■NOTE You’ll detect in that code the setPositiveButton takes an nameless process. this is often in a different way of wiring up occasion handlers in Android. fifty three CHAPTER four ■ ANDROID: fitting THE TOOLSET obtain from Wow! book if you happen to run the venture now, you’ll have a button that you should click on and exhibit a message field, as in keeping with determine 4-23. determine 4-23. A winning end result! end during this bankruptcy, we’ve obvious easy methods to set up the Eclipse IDE and Android SDK in order that we will be able to begin constructing purposes for Android. within the subsequent bankruptcy, we’ll begin taking a look at the performance of the Six Bookmarks software right. fifty four CHAPTER five ■ ■ ■ Android: development the Logon shape and eating leisure providers during this bankruptcy, now that we have got the toolset configured, we’re going to begin construction our Six Bookmarks program for Android. this can be going to contain beginning a brand new venture, developing the logon shape format, after which construction the infrastructure to name as much as our API and clients RESTful providers at http://services. multimobiledevelopment. com/. growing the undertaking the 1st position to begin is making a new Android undertaking for the Six Bookmarks software. to do that, you want to create a brand new workspace in Eclipse after which upload a brand new venture. If you’re now not operating Eclipse, while it begins and also you are brought on for a workspace folder course, create a brand new one. while you are working Eclipse, choose dossier – change Workspace – different, after which specify a brand new workspace folder direction. In both case, upload a brand new Android venture such as you did in bankruptcy 7.