Set background image android studio is very simple to do. I will give an example of the XML file, the example is easy to understand and follow the steps. I wrote these two articles a few days ago. This article was made based on Android Studio version 3. To extend a style, specify the style you want to extend with the parent attribute.
You can then override the inherited style attributes and add new ones. For example, you can inherit the Android platform's default text appearance and modify it as follows:. However, you should always inherit your core app styles from the Android Support Library. The styles in the support library provide compatibility with Android 4. The support library styles often have a name similar to the style from the platform, but with AppCompat included.
For example, the following example inherits text appearance styles from the support library:. You can also inherit styles except those from the platform by extending a style's name with a dot notation, instead of using the parent attribute. That is, prefix the name of your style with the name of the style you want to inherit, separated by a period. You should usually do this only when extending your own styles, not styles from other libraries. For example, the following style inherits all styles from the GreenText style above and then increases the text size:.
You can continue inheriting styles like this as many times as you'd like by chaining on more names. Note: If you use the dot notation to extend a style, and you also include the parent attribute, then the parent styles override any styles inheritted through the dot notation. All views support XML attributes from the base View class , and many views add their own special attributes.
For example, the TextView XML attributes includes the android:inputType attribute that you can apply to a text view that receives input, such as an EditText widget. You can create a theme the same way you create styles. Now every view in the app or activity applies the styles defined in the given theme.
If a view supports only some of the attributes declared in the style, then it applies only those attributes and ignores the ones it does not support. Beginning with Android 5. This modifies the theme for that view and any child views, which is useful for altering theme color palettes in a specific portion of your interface.
The previous examples show how to apply a theme such as Theme. AppCompat that's supplied by the Android Support Library. But you'll usually want to customize the theme to fit your app's brand. The best way to do so is to extend these styles from the support library and override some of the attributes, as described in the next section. Android provides a variety of ways to set attributes throughout your Android app.
For example, you can set attributes directly in a layout, you can apply a style to a view, you can apply a theme to a layout, and you can even set attributes programmatically. When choosing how to style your app, be mindful of Android's style hierarchy.
In general, you should use themes and styles as much as possible for consistency. If you've specified the same attributes in multiple places, the list below determines which attributes are ultimately applied. The list is ordered from highest precedence to lowest:. Figure 2. Styling from a span overrides styling from a textAppearance. For example, if you apply a theme to your app, along with a style to an individual View , the style attributes would override any matching theme attributes for that View.
Note, however, that any theme attributes that aren't overridden by the style are still used. One limitation with styles is that you can apply only one style to a View. Note, however, that if you define any text attributes directly on the View or in a style, those values would override the TextAppearance values. TextAppearance supports a subset of styling attributes that TextView offers.
For the full attribute list, see TextAppearance. TextAppearance works at the character level and not the paragraph level, so attributes that affect the entire layout are not supported. When you create a project with Android Studio, it applies a material design theme to your app by default, as defined in your project's styles.
This AppTheme style extends a theme from the support library and includes overrides for color attributes that are used by key UI elements, such as the app bar and the floating action button if used. So you can quickly customize your app's color design by updating the provided colors. For example, your styles. So that's the file you should edit to change the colors. But before you start changing these colors, preview your colors with the Material Color Tool.
This tool helps you pick colors from the material palette and preview how they'll look in an app. And then you can override whatever other styles you want.
For example, you can change the activity background color as follows:. For a list of attributes you can use in your theme, see the table of attributes at R. And when adding styles for the views in your layout, you can also find attributes by looking at the "XML attributes" table in the view class references. For example, all views support XML attributes from the base View class. Most attributes are applied to specific types of views, and some apply to all views.
However, some theme attributes listed at R. Theme apply to the activity window, not the views in the layout. For example, windowBackground changes the window background and windowEnterTransition defines a transition animation to use when the activity starts for details, see Start an Activity with an Animation. The Android Support Library also provides other attributes you can use to customize your theme extended from Theme.
AppCompat such as the colorPrimary attribute shown above. These are best viewed in the library's attrs. That's used only for attributes from the Android framework. There are also different themes available from the support library that you might want to extend instead of the ones shown above.
The best place to see the available themes is the library's themes. If a new version of Android adds theme attributes that you want to use, you can add them to your theme while still being compatible with old versions.
All you need is another styles. For example:. As such, you can avoid duplicating styles by beginning with a "base" theme and then extending it in your version-specific styles.
For example, to declare window transitions for Android 5. Now you can apply AppTheme in your manifest file and the system selects the styles available for each system version. For more information about using alternative resources for different devices, read Providing Resources. Every widget in the framework and support library has a default style. For example, when you style your app using a theme from the support library, an instance of Button is styled using the Widget.
Button style. You have to put this code in a thread. It is used for the background process. You should refer to the thread for background processes or use AsyncTask, which is also used for background process. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow.
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