![]() ![]() Type the following command, replacing “C:\Path\To\Picture.jpg” with the path to the picture you want to load, and press “Enter”:Īdb push C:\Path\To\Picture. Type the following command and press “Enter” to create the Pictures directory on the virtual SD card: If you installed the Android SDK to a different directory, specify that directory instead. Use the following command instead if you’re using a 32-bit version of Windows:Ĭd “C:\Program Files\Android\android-sdk\platform-tools” Type the following command into the Command Prompt window and press “Enter”:Ĭd “C:\Program Files (x86)\Android\android-sdk\platform-tools” Launch the virtual Android device in the Android emulator by clicking the “Start” button in the Android Virtual Device Manager window.Ĭlick “Start,” type “Command Prompt” and press “Enter” to launch the Command Prompt. If a number already appears in the Size box, the device already has an SD card. Type a number into the Size box in the SD Card section to create a virtual SD card for your virtual Android device. Open and run the Dice Roller app from the previous codelab in Android Studio. Update the layout for the app In this task, youll replace the TextView in your layout with an ImageView that displays an image of the dice roll result. Internet connection to download the dice images. LISTING 11.1 Changing ScaleType Programatically 1: package the virtual device you want to use and click the “Edit” button. A computer with Android Studio installed. When a radio button is selected, the scaleType for the ImageView is updated. ![]() Listing 11.1 show the code for an app that displays an ImageView and includes a RadioGroup and set of RadioButtons for changing the scale type. You can change scaleType dynamically in your code. _END: Maintain aspect ratio and fit the image in the right and bottom edge of the ImageView._START: Maintain aspect ratio and fit the image in the left and top edge of the ImageView._CENTER: Maintain aspect ratio and fit the image in the center of the ImageView.The width and height of the image fit within the ImageView. _INSIDE: The image is scaled, and the aspect ratio is maintained.For a large image, this has the effect of showing the center of the image. For a small image, this has the effect of enlarging the entire image. _CROP: Scales the image and keeps the aspect ratio until either the width of height of the image is the same as the width or height of the ImageView.The complete set of ScaleTypes are as follows: For example, refers to a scale type in which the image is centered in the ImageView. The options for ScaleType are defined in ImageView.ScaleType. Using ScaleType, you can have an image fill the entire ImageView, be centered in the ImageView, or be cropped and centered in the ImageView. The ScaleType defines how the image will be displayed within the ImageView. In this hour, you populate an ImageView using a resource id as the source and then explore several properties of how an ImageView can display an image. To populate a Drawable object from a resource, use the getResources.getDrawable() method: Drawable myDrawable = getResources().getDrawable(R.drawable.ic_launcher) To set an ImageView to an image resource defined by R.drawable.mainImage, you use the following: ImageView mainImage = (ImageView) findViewById(R.id.imageView1) setImageUri(): Use a URI to set the content of the ImageView.this means if your image is very big for instance ldpi will be very big. but problem is plugin uses original image as xhdpi and scales others. setImageResource(): Use a resource id to set the content of the ImageView. Right-click the drawable folder, and optimize imports, then it shows the path of drawable folder, open this path in Windows Explorer, copy any image to the path. ![]() setImageBitmap(): Set a Bitmap as the content of the ImageView.setImageDrawable(): Set a drawable as the content of the ImageView.The image can be a bitmap, drawable, Uri, or resource id. They differ by how the image to display is defined. There are four methods available for setting an image in an ImageView. The source of the image can be a resource, a drawable, or a bitmap. An ImageView can display any drawable image. You learned about different types of views in Hour 10, “More Views and Controls.” An ImageView is a view that displays an image, but you will find that there are unique aspects to working with images. In this chapter, you look at the details of handling images and bitmaps, including creating bitmaps, using drawing commands, and handling very large images. Images and media can play an important role in creating an exceptional Android app. Android Application Development in 24 Hours, Sams Teach Yourself, 4th Edition ![]()
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