Camden County College Tip Calculator App Project

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evzv93

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Camden County College

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read the documents below and follow the steps!

it needs to be done in android studio as well!

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Exercise 7-3 Modify a theme In this exercise, you'll modify the theme that's used by Tip Calculator app presented in this chapter: 1. Open the project named ch07_ex3_TipCalculator

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9. In the styles.xml file, modify the TextView style so it sets the layout_width layout height, and padding attributes for TextView and Edit Text widgets to the values that are currently stored in the XML file for the layout. Then, delete these attributes from the XML file for the layout. This should reduce code duplication 10. In the styles.xml file, change the padding attribute of the TextView style to 10dp. This should set the space between the widgets. 11. In the styles.xml file, modify the Button style so it sets the layout_width and layout_height attributes to 40dp. Then, switch to the XML for the layout and delete these attributes from that file. This should make both buttons a little smaller, and it should reduce code duplication. 12. Add two new TextView widgets to the form for a Per Person label and amount Set the id, text, and alignment attributes for these widgets appropriately. Then, apply the TextView.Label style to the label and the TextView style to the amount. This is an easy way to apply consistent formatting to these new widgets. Exercise 7-3 Modify a theme In this exercise, you'll modify the theme that's used by the Tip Calculator app presented in this chapter. 1. Open the project named ch07_ex3_TipCalculator. 2. Open the styles.xml file in the values directory. This file modifies the theme to automatically apply custom styles for the TextView, Edit Text, and Button widgets. This file also includes a custom style named TextView.Label that can be applied manually. 3. Open the layout for the app and view its XML. This XML only applies the TextView.Label style. 4. Add a RadioGroup.widget to the layout. Note that the radio buttons within the group use a different text size than the other widgets in the layout. 5. Modify the styles.xml file so it modifies the TextAppearance styles for the theme instead of modifying the styles for individual widgets. This should set the textSize property to 20sp for the TextAppearance style and its Small Medium, and Inverse variations. When you're done, all widgets should use a textSize of 20sp Use built-in themes 2. Open the styles.xml files in the values and values-v21 directories. These files Exercise 7-1 In this exercise, you'll modify the Tip Calculator app so it uses built-in themes to display a dark background. 1. Open the project named cho7_exl_TipCalculator each specify a built-in theme for the API level. 3. Open the AndroidManifest.xml file and review its code. It sets the custom theme named AppTheme as the theme for the application. 4. Open the layout for the app and view it in the graphical layout editor. Use the Android Version button to view the layout for API levels 16 and 23. This theme should look different for both of these APIs. 5. Edit the two styles.xml files so the app uses the theme named Theme.Holo prior to API 21 and uses Theme. Material for API 21 and later. 6. Open the layout for the app and view it in the graphical layout editor. These themes should display a dark background for all APIs. Use styles Exercise 7-2 In this exercise, you'll modify the styles for the Tip Calculator app presented in this chapter. 1. Open the project named ch07_ex2_TipCalculator. 2. Open the Gradle build script for this file. Note that it includes a dependency for the v7 appcompat library. 3. Open the class for the activity. Note that it extends the AppCompatActivity class. 4. Open the styles.xml file in the values directory. Note that this style uses the AppCompat theme. Note also that it defines several custom styles. 5. Open the layout for the activity and view its XML. Each widget applies one of the custom styles specified in the styles.xml file. 6. For the first TextView widget, delete the style attribute that applies the style. This should remove the style's formatting from that widget. Then, restore this style attribute. 7. For the last TextView widget, change the style from TextView.Label to TextView.Label.Indent. This should indent the Total label. Then, change the style back to the TextView.Label style. 8. In the styles.xml file, change the textSize attribute of the TextView style to 16sp. This should change the text size for all widgets on the layout.
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Anonymous
Really useful study material!

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