Getter and Setter to generate both accessor and mutator methods. Select the fields to generate getters or setters for and click OK. IntelliJ IDEA can generate an override for the standard toString() method defined in Java.lang.Object. The generated method returns the name of the class and a list. AndroidStudio includes keyboard shortcuts for many common actions. Table 1 shows the default keyboard shortcuts by operating system. Note: In addition to the default keymaps in table 1 below, you can select from a number of preset keymaps or create a custom keymap.
Contents. Aim of this chapter In previous chapter, we looked GridItemPresenter. Its relationship was following. Presenter: GridItemPresenter. ViewHolder’s view: TextView.
CardInfo/Item: String This was easy example. In this chapter, we proceed to introduce another type of Presenter,. Presenter: CardPresenter. ViewHolder’s view: ImageCardView.
CardInfo/Item: Movie class ImageCardView ImageCardView class is provided from Android SDK, and it provides a card design layout with main image, title text and content text. ImageCardView is a subclass of BaseCardView, so it is nice to look BaseCardView class. This is the explanation of BaseCardView, android.support.v17.leanback.widget public class BaseCardView extends android.widget.FrameLayout A card style layout that responds to certain state changes. It arranges its children in a vertical column, with different regions becoming visible at different times.
![Getter Getter](/uploads/1/2/5/6/125602561/592542453.png)
A BaseCardView will draw its children based on its type, the region visibilities of the child types, and the state of the widget. A child may be marked as belonging to one of three regions: main, info, or extra. The main region is always visible, while the info and extra regions can be set to display based on the activated or selected state of the View. The card states are set by calling setActivated and setSelected. BaseCardView itself does not provide specific design layout. So when you want to utilize this, you can make subclass of BaseCardView which have specific design.
ImageCardView is one of the class, and currently I could find only ImageCardView class as the subclass of BaseCardView provided by SDK. In this chapter, we will add this ImageCardView to our code. Implement CardPresenter, Movie class I will start by placing necessary files at first. Rightclick on package,. New → class → CardPresenter. New → class → Movie. For the main image, we use movie.png.
Copy res/drawable/movie.png from Android TV sample application. We will use Utility functions provided by Android TV sample application. Copy package name/Utils class from Android TV sample application to your source code. First, Utils.java is just copying from AOSP, which will be below. Build and Run 1 CardPresenter header will appear in the second line, and ImageCardView shows the default card image. The title and content text will appear when you move from header to contents (when items are “onActivated”).
Source code is on. Updating main image after downloading picture from web using Picasso Above example shows the default image in the ImageCardView which must be included together with your app (image is static).
Sometimes, however, you want to use the image downloading from web so that your application can show updated information. Picasso image loader library will help us to achieve this easily. Here are the references. In the CardPresenter class, we want to use picasso library, which can be included by adding a following line in app/build.gradle file. Interface Target is defined in picasso library, it represents an arbitrary listener for image loading. Target interface allows us to implement 3 listener functions.
onBitmapLoaded – Callback when an image has been successfully loaded. onBitmapFailed – Callback when an image has been successfully loaded. Linked with error.
onPrepareLoad – Callback invoked right before your request is submitted. Linked with placeholder Remaining task is to specify cardImageUrl from MainFragment, which is done in. Build and Run 2 Now main image is downloaded from the internet. Source code is on. Customizing ImageCardView, BaseCardView We can change the design type, and the animation behavior of the card. To begin with, I recommend to refer BaseCardView explanation in source code provided by Android SDK, A BaseCardView will draw its children based on its type, the region visibilities of the child types, and the state of the widget.
A child may be marked as belonging to one of three regions: main, info, or extra. The main region is always visible, while the info and extra regions can be set to display based on the activated or selected state of the View. The card states are set by calling setActivated and setSelected. In BaseCardView class, you can check the options available to change the design.
public void setCardType(int type). public void setInfoVisibility(int visibility). public void setExtraVisibility(int visibility) setCardType(int type) You can use following card type as argument.
CARDTYPEMAINONLY. CARDTYPEINFOOVER.
CARDTYPEINFOUNDER. CARDTYPEINFOUNDERWITHEXTRA The example with ImageCardView. CARDTYPEINFOUNDER, CARDTYPEINFOUNDERWITHEXTRA You can check the layout of ImageCardView in SDK foldersdk extras android support v17 leanback res layout lbimagecardview.xml.
ImageCardView has imageView as main region, and title and content text are in info region. The extra region is not set, therefore the behavior is same between CARDTYPEINFOUNDER and CARDTYPEINFOUNDERWITHEXTRA.
SetInfoVisibility(int visibility), setExtraVisibility(int visibility) You can use following card type as argument. CARDREGIONVISIBLEALWAYS – the region (title & content text area) will always appear. CARDREGIONVISIBLEACTIVATED – the region will not appear when user is selecting header. The region will appear when user move to RowsFragment. CARDREGIONVISIBLESELECTED – the region will not appear when this card/item is not selected. The region will appear only when the card/item is selected. The more detail explanation of these options can be referred from SDK source code.
Here I changed the setting by modifying onCreateViewHolder in CardPresenter class.