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FastCGI, which was created to address the shortcomings of CGI, started out as a proprietary extension to the CGI spec. It was then released and became a standard. FastCGI scripts are started only once. They then go into an event loop in which each call to the URL passes the data to an already running script. This eliminates the fork/exec and provides a way to maintain state information. FastCGI is really a different way of writing web applications than CGI or integrated methods. In FastCGI, your application is running the whole time. FastCGI uses more traditional IPC (Unix domain sockets or IP sockets) to handle the interprocess communication. This IPC mechanism also enables FastCGI programs to be located on more than one machine, which can be important for performance especially in a language such as OCaml that does not support SMP . Because FastCGI is not a very popular way of writing web applications, it will not be covered in any more detail in this chapter.

Most widget toolkits offer one or more grid-based controls. Android has a GridView control that can display data in the form of a grid. Note that although we use the term data here, the contents of the grid can be text, images, and so on. The GridView control displays information in a grid. The usage pattern for the GridView is to define the grid in the XML layout (see Listing 4 20), and then bind the data to the grid using an android.widget.ListAdapter. Don t forget to add the uses-permission tag to the AndroidManifest.xml file to make this example work.

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Runtime security in Android happens at the process level and at the operation level. At the process level, Android prevents one application from directly accessing another application s data. It does this by running each application within a different process and under a unique and permanent user ID. At the operational level, Android defines a list of protected features and resources. In order for your application to access this information, you have to add one or more permission requests to your AndroidManifest.xml file. You can also define custom permissions with your application. In the sections that follow, we will talk about process-boundary security and how to declare and use predefined permissions. We will also discuss creating custom permissions and enforcing them within your application. Let s start by dissecting Android security at the process boundary.

Listing 4 20. Definition of a GridView in an XML Layout and Associated Java Code < xml version="1.0" encoding="utf-8" > <!-- This file is at /res/layout/gridview.xml --> <GridView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/dataGrid" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="10px" android:verticalSpacing="10px" android:horizontalSpacing="10px" android:numColumns="auto_fit" android:columnWidth="100px" android:stretchMode="columnWidth" android:gravity="center" /> protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);

Integrated approaches seek to pull the logic of web-based applications closer into the web server to provide better application performance. They also can provide a better way of allowing for state management and interprocess communication.

setContentView(R.layout.gridview); GridView gv = (GridView)this.findViewById(R.id.dataGrid); Cursor c = getContentResolver().query(People.CONTENT_URI, null, null, null, null); startManagingCursor(c); String[] cols = new String[]{People.NAME}; int[] names = new int[]{android.R.id.text1}; SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1 ,c,cols,names); gv.setAdapter(adapter); }

Unlike your desktop environment where most of the applications run under the same user ID, each Android application generally runs under its own unique ID. By running each application under a different ID, Android creates an isolation boundary around each process. This prevents one application from directly accessing another application s data. Although each process has a boundary around it, data sharing between applications is obviously possible, but has to be explicit. In other words, to get data from another application, you have to go through the components of that application. For example, you can query

Listing 4 20 defines a simple GridView in an XML layout. The grid is then loaded into the activity s content view. The generated UI is shown in Figure 4 9.

Although it might be possible to program ASP (and ASP .NET) with F# (Microsoft Research s port of OCaml to the .NET platform), it is not really a practical suggestion. As noted, most of the web programming resources for OCaml focus on the Unix environment.

The grid shown in Figure 4 9 displays the names of the contacts on the device. We have decided to show a TextView with the contact names, but you could easily generate a grid filled with images and the like. In fact, we ve used another shortcut in this example. Instead of creating our own layout file for the grid items, we ve taken advantage of predefined layouts in Android. Notice the prefix on the resources for the grid item layout and the grid item field is android:. Instead of looking in our local /res directory, Android looks in its own. You can browse to this folder by navigating to the Android SDK folder

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