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Implementing our BookProvider sample content provider involves extending the ContentProvider class and overriding onCreate() to create the database and then implement the query, insert, update, delete, and getType methods. This section covers the setup and creation of the database, while the following sections deal with each of the individual methods: query, insert, update, delete, and getType. A query method requires the set of columns it needs to return. This is similar to a select clause that requires column names along with their as counterparts (sometimes called synonyms). Android uses a map object that it calls a projection map to represent these column names and their synonyms. We will need to set up this map so we can use it later in the query-method implementation. In the code for the provider implementation (see Listing 3 25), you will see this done up front. Most of the methods we ll be implementing take a URI as an input. Although all the URIs that this content provider is able to respond to start with the same pattern, the tail ends of the URIs will be different just like a web site. Each URI, although it starts the same, must be different to identify different data or documents. Let us illustrate this with an example:

As you have seen in this chapter, matrices are key to transforming views and animations. We will now briefly explore some key methods of the Matrix class. These are the primary operations on a matrix: matrix.reset(); matrix.setScale(); matrix.setTranslate() matrix.setRotate(); matrix.setSkew(); The first operation resets a matrix to an identity matrix, which causes no change to the view when applied. setScale is responsible for changing size, setTranslate is responsible for changing position to simulate movement, and setRotate is responsible for changing orientation. setSkew is responsible for distorting a view. You can concatenate matrices or multiply them together to compound the effect of individual transformations. Consider the following example, where m1, m2, and m3 are identity matrices: m1.setScale(); m2.setTranlate() m3.concat(m1,m2) Transforming a view by m1 and then transforming the resulting view with m2 is equivalent to transforming the same view by m3. Note that set methods replace the previous transformations, and that m3.concat(m1,m2) is different from m3.concat(m2,m1). You have already seen the pattern used by preTranslate and postTranslate methods to affect matrix transformation. In fact, pre and post methods are not unique to translate, and you have versions of pre and post for every one of the set transformation methods. Ultimately, a preTranslate such as m1.preTranslate(m2) is equivalent to m1.concat(m2,m1) In a similar manner, the method m1.postTranslate(m2) is equivalent to m1.concat(m1,m2)

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This question does not have a simple answer. On one hand, it is important to understand BNF notation so that you can understand it when you come across it (which you will). I cannot, however, point to a specific positive outcome that will occur if you understand BNF notation. If you want to use and create grammars and structured data files, understanding BNF will enable you to communicate and understand definitions. Understanding BNF will also enable you to understand programming languages better (including OCaml). Almost all programming languages have BNF structures available for them.

Uri1: content://com.androidbook.provider.BookProvider/books Uri2: content://com.androidbook.provider.BookProvider/books/12

You want your application to be as memory efficient as possible when running on a device. If your application contains uncompressed data (perhaps certain image types or data files) at runtime, Android can map this data straight into memory using the mmap() call. In order for this to work, though, the data must be aligned on a 4-byte memory boundary. The CPUs in Android devices are 32-bit processors, and 32 bits equals 4 bytes. The mmap() call makes the data in your .apk file look like memory, but if the data is not aligned on a 4-byte boundary then it can t do that and extra copying of data must occur at runtime. The zipalign tool, found in the Android SDK tools directory, looks through your application and moves slightly any uncompressed data not already on a 4byte memory boundary to a 4-byte memory boundary. You may see the file size of your application increase slightly but not significantly. To perform an alignment on your .apk file, use this command in a tools window (see also Figure 7 2):

By extension, the code matrix.setScale(interpolatedTime, interpolatedTime); matrix.preTranslate(-centerX, -centerY); matrix.postTranslate(centerX, centerY); is equivalent to Matrix matrixPreTranslate = new Matrix(); matrixPreTranslate.setTranslate(-centerX, -centerY); Matrix matrixPostTranslate = new Matrix(); matrixPostTranslate.setTranslate(cetnerX, centerY); matrix.concat(matrixPreTranslate,matrix); matrix.postTranslate(matrix,matrixpostTranslate);

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