Formation Android 1)

async-task.java

private class ParlezVousTask extends AsyncTask<String, Void, Boolean> {

	@Override
	protected void onPreExecute() {
		// exécuté dans l'UIThread
	}

	@Override
	protected Boolean doInBackground(String... params) {

		// exécuté sur un autre thread

		return true;
	}

	@Override
	protected void onPostExecute(Boolean result) {
		// exécuté dans l'UIThread
	}
}

broadcast-receiver.java

// envoyer un broadcast
Intent intent = new Intent();
intent.setAction("com.excilys.formation.MY_OWN_BROADCAST");
sendBroadcast(intent);

DefaultHttpClient.java

try {
	DefaultHttpClient client = new DefaultHttpClient();
	HttpGet request = new HttpGet("http://www.google.com");
	HttpResponse response = client.execute(request);

	InputStream content = response.getEntity().getContent();

	// ...

} catch (ClientProtocolException e) {
	e.printStackTrace();
} catch (IOException e) {
	e.printStackTrace();
}

intent-activity.java

Intent intent = new Intent(this, MyActivity.class);
startActivity(intent);

// ou

Intent intent = new Intent();
intent.setAction("com.excilys.formation.MY_OWN_ACTION");
startActivity(intent);

log-tag.java

public class ParlezVousActivity extends Activity {

	private final String TAG = ParlezVousActivity.class.getSimpleName();

MainActivity.java

public class MainActivity extends Activity {

	private TextView myTextView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		myTextView = (TextView) findViewById(R.id.my_text_view);

		myTextView.setText(R.string.hello_world);
	}
}

R-layout.java

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/my_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@string/hello_world" />

</RelativeLayout>

R-strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">Example</string>
    <string name="hello_world">Hello world!</string>

</resources>

R.java

public final class R {
    public static final class attr {
    }
    public static final class drawable {
        public static final int ic_launcher=0x7f020000;
    }
    public static final class id {
        public static final int my_text_view=0x7f070000;
    }
    public static final class layout {
        public static final int activity_main=0x7f030000;
    }
    public static final class string {
        public static final int app_name=0x7f040000;
        public static final int hello_world=0x7f040001;
    }
}

state.java

@Override
protected void onSaveInstanceState(Bundle outState) {
  super.onSaveInstanceState(outState);
  // Juste un exemple, retient nombre
  outState.putInt("NUMBER", 4);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
  super.onRestoreInstanceState(savedInstanceState);
  // La nouvelle Activity créée peut récupérer ce nombre
  int selectedIndex = savedInstanceState.getInt("NUMBER");
}