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Figure 8-8. Setting the primary key 4. Now give the ProductID field a property of an autoincrement by clicking the option (Is Identity) and choosing Yes, as shown in Figure 8-9.

The stock system permissions all begin with android.permission and are listed in the Android SDK documentation for Manifest.permission. Third-party applications may have their own permissions, which hopefully they have documented for you. Here are some of the more important built-in permissions: INTERNET, if your application wishes to access the Internet through any means, from raw Java sockets through the WebView widget READ CALENDAR, READ CONTACTS, and the like for reading data out of the built-in content providers WRITE CALENDAR, WRITE CONTACTS, and the like for modifying data in the built-in content providers Permissions are confirmed at the time the application is installed the user will be prompted to confirm it is OK for your application to do what the permission calls for. This prompt is not available in the current emulator, however. If you do not have the desired permission and you try to do something that needs it, you may get a SecurityException informing you of the missing permission, but this is not a guarantee failures may come in other forms, depending on if something else is catching and trying to handle that exception.

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Yet another option is to use SQLiteQueryBuilder, which offers much richer querybuilding options, particularly for nasty queries involving things like the union of multiple subquery results. The SQLiteQueryBuilder interface dovetails nicely with the ContentProvider interface for executing queries. Hence, a common pattern for your content provider s query() implementation is to create a SQLiteQueryBuilder, fill in some defaults, and then allow it to build up (and optionally execute) the full query combining the defaults with what is provided to the content provider on the query request. For example, here is a snippet of code from a content provider using SQLiteQueryBuilder:

Figure 8-9. Setting the identity property 5. Now you ll save the table for which you just entered the information. Specifically, click the Save icon, as shown in Figure 8-10.

Figure 8-10. Saving the new table 6. When executing this action, you will be prompted to enter the name of the table. Enter Products, as shown in Figure 8-11.

The other side of the coin, of course, is to secure your own application. If your application is merely activities and intent receivers, security may be just an outbound thing, where you request the right to use resources of other applications. If, on the other hand, you put content providers or services in your application, you will want to implement inbound security to control which applications can do what with the data. Note that the issue here is less about whether other applications might mess up your data, and more about privacy of the user s information or use of services that might incur expense. That is where the stock permissions for built-in Android applications are focused can you read or modify contacts, can you send SMS messages, etc. If your application does not store information that might be considered private, security is less of an issue. If, on the other hand, your application stores private data, such as medical information, security is much more important. The first step to securing your own application using permissions is to declare said permissions, once again in the AndroidManifest.xml file. In this case, instead of uses-permission, you add permission elements. Once again, you can have zero or more permission elements, all as direct children of the root manifest element.

@Override public Cursor query(Uri url, String[] projection, String selection, String[] selectionArgs, String sort) { SQLiteQueryBuilder qb=new SQLiteQueryBuilder(); qb.setTables(getTableName()); if (isCollectionUri(url)) { qb.setProjectionMap(getDefaultProjection()); } else { qb.appendWhere(getIdColumnName()+"="+url.getPathSegments().get(1)); } String orderBy; if (TextUtils.isEmpty(sort)) { orderBy=getDefaultSortOrder(); } else { orderBy=sort; } Cursor c=qb.query(db, projection, selection, selectionArgs, null, null, orderBy); c.setNotificationUri(getContext().getContentResolver(), url); return c; }

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