Use the arrow keys to select "OK" and press Enter or Return. Select Yes and press ' Enter or Return to format. When the format is complete, you'll be asked if you want to install Grub. Press the Y key to install Grub when prompted. Power down your virtual machine once Android is installed.
Once you see the blue success screen, click the X at the top-right corner, and select the option to turn off the machine.
Now that Android is installed, you'll need to remove the virtual install disk so you can boot right into the operating system.
Click the Storage tab. In the Attributes panel on the right, click the small black arrow below the tiny CD button. Start your Android virtual machine. Now that you've installed Android, you can start it by double-clicking it in the left column, or by clicking the green Start arrow at the top.
When it boots up, select the first option not the debug options in the list to launch Android. If Android opens to the console prompt, wait a few moments for Android to start. There's nothing you need to do make this happen. Once Android launches, you can sign in with your Google account and personalize your settings.
Method 2. Connect your Android phone or tablet to Wi-Fi. If there is a more recent version of the Android operating system that is compatible with your phone or tablet, you can install it over your Wi-Fi connection.
Although Android is always being updated, different phone manufacturers and providers have their own update schedules. It may take longer for some models to get the latest updates.
If your Android does not have a full charge, plug it into a power source before you continue. Tap System or System updates. The option varies by model.
If you don't see one of these options, try About phone or About tablet instead. Tap Check for updates or System update. If a more recent version of Android is ready to be installed, you'll be prompted to install it. If not, you'll see a message that says the software is up to date. Follow the on-screen instructions to install the update. If an update is available, you'll be asked if you want to install it now. Follow the on-screen instructions to do so.
When the installation is complete, your Android will reboot and the new version will be ready to use. Method 3. This is the official website of Android's beta testing program for Pixel owners.
For more information about WebP, visit the WebP site. Different image formats are suitable for different types of images. Figure 5 shows two images that come out quite differently depending on which compression scheme the developer applies.
The image on the left has many small details, and thus compresses more efficiently with JPG. The image on the right, with runs of the same color, compresses more efficiently with PNG. The only thing to keep in mind is that it only has native support on devices running Android 4. Fortunately, the large majority of devices satisfy that requirement. There are several techniques you can use to achieve the right balance between compression and image quality.
The other technique takes advantage of the Butteraugli library, and is usable for all image formats. The power of JPG and WebP comes from the fact that you can use a scalar value to balance quality against file size.
The trick is finding out what the correct quality value is for your image. Too low a quality level produces a small file at the cost of image quality.
Too high a quality level increases file size without providing a noticeable benefit to the user. The most straightforward solution is to pick some non-maximum value, and use that value. However, be aware that the quality value affects every image differently. You should make sure to test your chosen maximum value against a representative sample of images. Also, make sure to perform all of your tests against the original images, and not on compressed versions.
For large media applications that upload and re-send millions of JPGs a day, hand-tuning for each asset is impractical. You might address this challenge by specifying several different quality levels, according to image category.
The Butteraugli project is a library to test an image's Psychovisual Error Threshold: the point at which a viewer starts to notice image degradation. In other words, this project attempts to quantify how distorted your compressed image is. You can then choose the image that is the best balance of file size and Butteraugli level.
Butteraugli allows you to proceed based on either output or input. That is, you can look for the lowest quality setting before a user perceives noticeable distortion in the resulting image, or you can iteratively set image-distortion levels to learn their associated quality levels.
It is tempting to keep only a single resolution of an image on a server. When a device accesses the image, the server serves it at that one resolution and leaves downscaling to the device. This solution is convenient for the developer, but potentially painful for the user, because the solution forces the user to download much more data than they need.
You should instead store multiple sizes of images, and serve the size that is most appropriate for a particular use case. For example, for a thumbnail, serving an actual thumbnail image instead of serving and downscaling a full-size version consumes much less network bandwidth. This approach is good for download speed, and is less costly for users who may be using limited or metered data plans.
Proceeding like this also results in the image's taking less space on the device and in main memory. In the case of large images, such as 4K ones, this approach also saves the device from having to resize images before loading them. Implementing this approach requires that you have a backend image service to provide images at various resolutions with proper caching.
There are existing services that can provide help with this task. For example, App Engine comes with image resizing functionality already installed. Content and code samples on this page are subject to the licenses described in the Content License. App Basics. Build your first app. App resources. Resource types. App manifest file. Device compatibility. Multiple APK support.
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