Tutoriel Android : Apprendre à utiliser les Intent pour la communication des briques applicatives

public class MultiTabBrowserTuto extends TabActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Define the Tab structure
        setContentView(R.layout.main);
        // Retrieve the ressource to access to the icon
        Resources resources = getResources(); // Resource object to get
                                                // Drawables
        // Set the tabHost (set it has final to use it in the
        // OnTabChangeListener)
        final TabHost tabHost = getTabHost();
        // Define the tabSpec that can be thought has the content of the
        // TabPanel
        TabHost.TabSpec tabSpec;
        // Define the intent that is used to populate the tabSpec
        Intent intent;

        // Create an Intent to launch an Activity for the tab
        intent = new Intent().setClass(this, SiteWebSTI.class);

        // Initialize a TabSpec for each tab and add it to the TabHost
        // Get a new TabHost.TabSpec associated with this tab host.
        tabSpec = tabHost.newTabSpec("SiteWebSti");
        // Define its indicator the label displayed (it should be
        // ressources.getString(R.string.stringId)
        tabSpec.setIndicator("SiteSti",
                resources.getDrawable(R.drawable.ic_tab));
        // Define the content of the Spec (the TabPanel)
        tabSpec.setContent(intent);
        // Add it to the tab container
        tabHost.addTab(tabSpec);

        // Do the same with the tab that displays a simple TextView:
        // Define the intent that will be displayed
        intent = new Intent().setClass(this, TextViewActivity.class);
        // Get a new TabHost.TabSpec associated with this tab host.
        tabSpec = tabHost.newTabSpec("textView");
        // Define its indicator the label displayed (it should be
        // ressources.getString(R.string.stringId)
        tabSpec.setIndicator("TextView",
                resources.getDrawable(R.drawable.ic_tab));
        // Define the content of the Spec (the TabPanel)
        tabSpec.setContent(intent);
        // Add it to the tab container
        tabHost.addTab(tabSpec);

        // Do the same with the tab that displays a simple Clock (analogic and
        // digital):
        // Define the intent that will be displayed
        intent = new Intent().setClass(this, ClockAD.class);
        // Get a new TabHost.TabSpec associated with this tab host.
        tabSpec = tabHost.newTabSpec("clock");
        // Define its indicator the label displayed
        tabSpec.setIndicator("Clock", resources.getDrawable(R.drawable.ic_tab));
        // Define the content of the Spec (the TabPanel)
        tabSpec.setContent(intent);
        // Add it to the tab container
        tabHost.addTab(tabSpec);

        // Define the current tab displayed (here the clock)
        tabHost.setCurrentTab(2);
        // Add a listener that just displays a Toast with the tag of the new
        // selected tab
        tabHost.setOnTabChangedListener(new OnTabChangeListener() {
            @Override
            public void onTabChanged(String tabId) {
                Toast.makeText(getApplicationContext(),
                        "New tab selection : " + tabHost.getCurrentTabTag(),
                        Toast.LENGTH_SHORT).show();
            }
        });

    }
}

public class SiteWebSTI extends Activity {
    WebView browser;

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

        browser = new WebView(this);
        setContentView(browser);
        browser.loadUrl("http://www.stinfoservices.net/");
    }
}

public class TextViewActivity extends Activity {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        TextView textview = new TextView(this);
        textview.setText("Hello Guy this a TabPanel also called TabSpec");
        setContentView(textview);
    }
}

public class ClockAD extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.clock);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
  <AnalogClock android:id="@+id/analog"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:layout_centerHorizontal="true"
   android:layout_alignParentTop="true"
   />
   <DigitalClock android:id="@+id/digital"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_centerHorizontal="true"
     android:layout_below="@id/analog"
     />
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:padding="5dp">
        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" />
        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:padding="5dp" />
    </LinearLayout>
</TabHost>

<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- When selected, use grey -->
    <item android:drawable="@drawable/ic_tab_grey"
          android:state_selected="true" />
    <!-- When not selected, use white-->
    <item android:drawable="@drawable/ic_tab_white" />
</selector>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
                package="net.stinfoservices.android.tuto.gui" android:versionCode="1"
                android:versionName="1.0">
                <application android:icon="@drawable/icon" android:label="@string/app_name">
                               <activity android:name=".MultiTabBrowserTuto"
                                               android:label="@string/app_name"
                                               android:theme="@android:style/Theme.NoTitleBar">
                                               <intent-filter>
                                                               <action android:name="android.intent.action.MAIN" />
                                                               <category android:name="android.intent.category.LAUNCHER" />
                                               </intent-filter>
                               </activity>
                               <activity android:name="SiteWebSTI"></activity>
                               <activity android:name="TextViewActivity"></activity>
                               <activity android:name="ClockAD"></activity>
                </application>
                <uses-sdk android:minSdkVersion="8" />
                <uses-permission android:name="android.permission.INTERNET"></uses-permission>
</manifest>