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Dealing with exceptions is part of any program, but software that makes use of external services (such as HTTP services) must pay additional attention to exceptions because the potential for errors is magnified There are several types of exceptions that you can expect while making use of HTTP services These are transport exceptions, protocol exceptions, and timeouts You should understand when these exceptions could occur Transport exceptions can occur due to a number of reasons, but the most likely scenario with a mobile device is poor network connectivity Protocol exceptions are exceptions at the HTTP protocol layer These include authentication errors, invalid cookies, and so on You can expect to see protocol exceptions if, for example, you have to supply login credentials as part of your HTTP request but fail to do so Timeouts, with respect to HTTP calls, come in two flavors: connection timeouts and socket timeouts.

Security in Android spans the deployment and execution of the application. With respect to deployment, Android applications have to be signed with a digital signature in order for you to install them onto a device. With respect to execution, Android runs each application within a separate process, each of which has a unique and permanent user ID (assigned at install time). This places a boundary around the process and prevents one application from having direct access to another s data. Moreover, Android defines a declarative permission model that protects sensitive features (such as the contact list). In the next several sections, we are going to discuss these topics. But before we get started, let s provide an overview of some of the security concepts that we ll refer to later.

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A connection timeout can occur if the HttpClient is not able to connect to the HTTP server if, for example, the URL is not correct or the server is not available A socket timeout can occur if the HttpClient fails to receive a response within a defined time period In other words, the HttpClient was able to connect to the server, but the server failed to return a response within the allocated time limit Now that you understand the types of exceptions that might occur, how do you deal with them Fortunately, the HttpClient is a robust framework that takes most of the burden off your shoulders In fact, the only exception types that you ll have to worry about are the ones that you ll be able to manage easily.

The HttpClient takes care of transport exceptions by detecting transport issues and retrying requests (which works very well with this type of exception) Protocol exceptions are exceptions that can generally be flushed out during development Timeouts are the ones that you ll have to deal with A simple and effective approach to dealing with both types of timeouts connection timeouts and socket timeouts is to wrap the execute() method of your HTTP request with a try/catch and then retry if a failure occurs This is demonstrated in Listing 8 5..

As we said earlier, Android requires that applications be signed with a digital certificate One of the benefits of this requirement is that an application cannot be updated with a version that was not published by the original author If we publish an application, for example, then you cannot update our application with your version (unless, of course, you somehow obtain our certificate and the password associated with it) That said, what does it mean for an application to be signed And what is the process of signing an application You sign an application with a digital certificate A digital certificate is an artifact that contains information about you, such as your company name, address, and so on A few important attributes of a digital certificate include its signature and public/private key A public/private key is also called a key pair.

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Listing 8 5. Implementing a Simple Retry Technique to Deal with Timeouts import java.io.BufferedReader; import java.io.IOException;

import java.io.InputStreamReader; import java.net.URI; import import import import org.apache.http.HttpResponse; org.apache.http.client.HttpClient; org.apache.http.client.methods.HttpGet; org.apache.http.impl.client.DefaultHttpClient;

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