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Reprinted-essential knowledge for mobile terminal development

Document directory (1) CSS pixels and device pixels (2) PPI/DPI (3) density determines the proportion (4) use of viewport (1) Simple and rude (2) perfection (3) reasonable compromise (1) weinre Remote Real-time debugging (2) AVD simulator debugging (3) Mobile Phone packet capture and host Configuration There are more and more mobile devices, and more than 1.3 million android mobile phones are activated every day. Therefore, our webapps f

Changing the resolution will affect the size of the EMF image.

When they are displayed on the target device and they also record the features of the target device, Enhanced Metafile images record their sizes. The image size displayed on the printer device is the same as the document size. There can be a major difference between the displayed size and the document size on the screen device because the physical features (resolutions) of the screen usually do not match the logical features used by windows. The enhanced primitive File Header records the follow

Pixel, resolution

DPI indicates the resolution, which is the number of points per inch in length. DPI can be subdivided into horizontal resolution and vertical resolution. For example, if the horizontal resolution of a 1 inch * 1 inch image is 100 dpi and the vertical resolution is 50 DPI, it divides horizontally into 100 segments per i

Android multi-resolution and multi-density interface adaptation solution

Preface At the beginning of Android's design, the UI was adapted to multiple platforms. It provided a complete adaptation mechanism and became more accurate with the development of the version, UI adaptation is mainly influenced by two factors: screen size (screen width and pixel height) and screen density. Different adaptation schemes are used for different application scenarios, this document is only applicable to Android4.0 and earlier versions. Related Concepts Resolution:The number of pixe

Qt on Android: Create a scalable interface, qtandroid

Qt on Android: Create a scalable interface, qtandroid To use Qt to develop Android applications, you also need to adapt to different mobile devices and adapt to a variety of screens and resolutions. This time we will discuss how to use the mechanism provided by Qt to create a scalable interface.DPI DPI must be explained. DPI, dot per inch, that is, the number of points contained in each inch. Another concep

Android,app Common icon Size specification

Address: http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2015/0120/2331.html1. Program Start icon:LDPI (Low Density screen,120 DPI) with an icon size of X-px.MDPI (Medium Density screen, DPI) with an icon size of x px.HDPI (High Density-screen, + DPI) with an icon size of X-px.XHDPI (extra-high density screen, at + DPI

Android drawable Micro tricks that you don't know about the drawable of those details

micro-tricks.Name the picture android_logo.png, and then put it under the Drawable-xxhdpi folder. Why do you put it in this folder? Because the density of my phone's screen is xxhdpi. So how do you know the density of your phone's screen? You can use the following method to get the DPI value to the screen first:float xdpi = getResources().getDisplayMetrics().xdpi;float ydpi = getResources().getDisplayMetrics().ydpi;where xdpi represents the

The most complete site metadata meta tag meaning and how to use it

issue will be resolved effectively in the next preview version. To use Consumer Preview to test these APIs on your own site, use the Security tab in the Internet Properties dialog box to join the site's domain to the list of trusted sites.Desktop task bar NotificationsPinned site notifications displayed as icon overlays in the desktop taskbar continue to apply to Windows 8 and IE10 on the desktop. There is no such notification for pinned sites in the Windows 8 start screen. Windows 8 is not onl

Android Phone UI Design resolution Basics

1. Terminology and concepts Android Phone UI Design resolution Basics Screen size (on-screen dimensions) Refers to the actual physical size of the phone, such as 2.8-inch, 3.2-inch, 3.5-inch, 3.7-inch Motorola Milestone mobile phone is 3.7 inches Aspect Ratio (Wide-high ratio) Refers to the actual physical dimensions of the wide-high ratio, divided into long and nolong Milestone is 16:9 and belongs to long. Resolution (resolution) As with the computer resolution concept, ref

Android app icon size _android

In the Android program, the icons are set in the drawable, but the results are not shown in Millet 2, but they appear normal in my own HTC and emulator. It was later found that the DPI of millet was not the same. It was later discovered that Android loaded a series of icons to accommodate different resolutions and DPI. ldpi (Low density screen,120 DPI) with an

iOS Development: Resolution Pixel How much do you know?

iPhone screen size and resolution of some small posture 20160303 IPhone devices now have multiple resolutions , as listed in the following table, Equipment Screen Size Resolution (PT) Reader Resolution (PX) after rendering PPI (DPI) IPhone 3GS 3.5 inch 480 x @1x 480 x Empty 163 IPhone 4/4s 3.5 inch 480 x @2x 640 x 960 Empty 326

HTMLmetaviewport attribute description _ HTML/Xhtml _ webpage Creation

initial scale, that is, the scale when the page is loaded for the first time. Maximum-scale: the maximum scale that users can scale. Minimum-scale: minimum scale that allows users to scale. User-scalable: whether the user can manually Scale Questions about viewport Viewport is not only unique in ios, but also has viewport on android and winphone. They solve the same problem, that is, directly resetting the resolution between the physical size and the browser through

MATLAB plotting Methods

MATLABCodeThere are three ways to control plotting: 1,Saveas Save the image by default regardless of the image size you set It is actually the Save As operation in the visual interface. 2,Imwrite Save the image as WYSIWYG An important purpose of this function is to save images with the specified Alpha value (see the following figure) The input parameter must be image data and cannot be an image handle. Therefore, it is often used with imread or getframe. 3,Print It was not us

How does Android adapt to screen size?

1. Screen related concepts 1.1 resolutionThe number of pixels on the screen.1.2 screen sizeIt refers to the actual physical size of the mobile phone, such as the commonly used 2.8 inch, 3.2 inch, 3.5 inch, 3.7 inchAndroid divides the screen size into four levels (small, normal, large, and extra large ).1.3 screen DensityNumber of records per inchThe cell phone can have the same resolution, but the screen size can be different,Diagonal pixel indicates the pixel value of the diagonal line (=),

Device-independent units in WPF

The WPF form and all internal elements are measured by device-independent units. A device irrelevant unit is defined as one of 96 points of 1 inch, that is, 1/96 inch. Suppose we have created a WPF button in 96X96 units. If standard Windows DPI settings (96 dpi) are used ), the size of each unit is a physical pixel in the real world. The calculation formula is as follows: Physical unit size = device indep

The UI Designer should not know the android screen knowledge, uiandroid

The UI Designer should not know the android screen knowledge, uiandroid Provided by Beijing shangxuetang Many designers and engineers were confused by the various screens of Android devices. I did both the UI design and the android interface layout. I was just familiar with this content, I have also made related lectures within the company. Here, I will reorganize this part of knowledge and share it with you! 1Understand several concepts (1) Resolution. Resolution refers to the number of pixel p

& Lt; meta & gt; viewport of the tag, metaviewport

scale, that is, the scale when the page is loaded for the first time. Maximum-scale: the maximum scale that users can scale. Minimum-scale: minimum scale that allows users to scale. User-scalable: whether the user can manually scale. Iii. Questions about viewport: Viewport is not only unique in ios, but also has viewport on android and winphone. They solve the same problem, that is, directly resetting the resolution between the physical size and the browser through

HTML meta viewport attribute description

: minimum scale that allows users to scale.User-scalable: whether the user can manually Scale Questions about viewport Viewport is not only unique in ios, but also has viewport on android and winphone. They solve the same problem, that is, directly resetting the resolution between the physical size and the browser through dpi, regardless of the actual resolution of the device. This resolution is irrelevant to the resolution of the device. For example,

Self-taught WPF series (1)

GDI windows form application uses the operating system control to establish its application. Therefore, it is basically difficult to customize them in your application. The WPF control is actually drawn on your screen. Therefore, if necessary, you can completely customize the control and modify its behavior.Features of WPF WPF has many advantages. Let me introduce the following:Pixels unrelated to devices (DPI) WPF introduces device-independent

Pictures and la s of different Android sizes (mobile phones)

To handle a wide range of resolutions and sizes. For images, Android uses DPI as the unit. If you select an image, right-click the image under win and you will see the DPI attribute. The higher the DPI, the finer the image. For a mobile phone or display device, a pixel is a point, so DPI = PPI. In turn, it is often sai

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