When decoded, the vector yields an orientation angle and confidence magnitude. The confidence magnitude is used to scale the size information, unless it is geometric.
If the value is default , the system uses the interpolated calibration if the orientation axis available, otherwise uses none. The calculation of the Orientation and Tilt fields depends on the specified calibration parameters and available input. The Distance field describes the distance between the tool and the touch device surface. A value of 0. If the value is none , the distance is unknown so it is set to 0. If the value is scaled , the reported distance is multiplied by a constant scale factor.
If the value is default , the system uses the scaled calibration if the distance axis available, otherwise uses none. The calculation of the Distance field depends on the specified calibration parameters. The configuration properties for touch devices changed significantly in Android Ice Cream Sandwich 4.
All input device configuration files for touch devices must be updated to use the new configuration properties.
Older touch device drivers may also need to be updated. There are several ways of doing this, depending on the capabilities of the touch controller. Some touch controllers can be directly configured to implement soft keys by setting firmware registers.
Other times it is desirable to perform the mapping from touch coordinates to key codes in software. When virtual keys are implemented in software, the kernel must export a virtual key map file called virtualkeys. A virtual key map file describes the coordinates and Linux key codes of virtual keys on the touch screen. A virtual key map file is a plain text file consisting of a sequence of virtual key layout descriptions either separated by newlines or by colons.
In the above example, the touch screen has a resolution of x Two finger motion both fingers moving in the same direction: drag the area under the pointer in that direction. The pointer itself does not move. Content and code samples on this page are subject to the licenses described in the Content License. Docs Getting Started About.
Core Topics Architecture. Overview Architecture. Modular System Components. Modular Kernels. HIDL General. HIDL Java. ConfigStore HAL. Device Tree Overlays. Vendor NDK. Vendor Interface Object.
Core Concepts. Camera Features. Bluetooth and NFC. Calling and Messaging. ACTS Tests. Surface and SurfaceHolder. SurfaceFlinger and WindowManager. Hardware Composer HAL. OpenGL ES. Neural Networks. Audio Accessories. USB Headset. Custom Accessories. Sensors HAL. Context Hub Runtime Environment. Test Development Workflow. Instrumentation Tests. Native Tests. Android Test Station.
Test Framework. VTS Dashboard. Lab Infrastructure. Getting Started. Testing with TF. Through Tradefed. Through Suite. Developing TF. XML Configuration. Global Configuration. Advanced Concepts. Device Manager. Device setup. Evaluating Performance. Feature Implementation. Dynamic Partitions. Touch devices may have buttons whose functions are similar to mouse buttons.
An input device is classified as a single-touch device if both of the following conditions hold: The input device is not classified as a multi-touch device. Refer to the section below about the location and format of virtual key map files. Next, the system loads the input device configuration file for the touch device.
Buttons Buttons are optional controls that may be used by applications to perform additional functions. Tools and Tool Types A tool is a finger, stylus or other apparatus that is used to interact with the touch device. Hovering vs. Touching Tools Tools can either be in contact with the touch device or in range and hovering above it.
Touch Device Driver Requirements Touch device drivers should only register axes and key codes for the axes and buttons that they actually support. Reporting distance information is optional but recommended for stylus devices. Reporting tilt information is optional but recommended for stylus devices.
The following changes may be required: When a tool becomes inactive finger goes "up" , it should stop appearing in subsequent multi-touch sync reports. Touch Device Operation The following is a brief summary of the touch device operation on Android.
Touch Device Configuration Touch device behavior is determined by the device's axes, buttons, input properties, input device configuration, virtual key map and key layout. Refer to the following sections for more details about the files that participate in keyboard configuration: Input Device Configuration Files Virtual Key Map Files Properties The system relies on many input device configuration properties to configure and calibrate touch device behavior.
Documentation Conventions For documentation purposes, we will use the following conventions to describe the values used by the system during the calibration process. Raw Axis Ranges The following expressions denote the bounds of raw values. Output Ranges The following expressions denote the characteristics of the output coordinate system.
For touch screens associated with a display , this is the display width in pixels. For touch pads not associated with a display , the output width equals raw. For touch screens associated with a display , this is the display height in pixels.
For touch pads not associated with a display , the output height equals raw. Basic Configuration The touch input mapper uses many configuration properties in the input device configuration file to specify calibration values. Prior to Honeycomb, all touch devices were assumed to be touch screens.
Prior to Honeycomb, all touch devices were assumed to be orientation aware. Calculation The calculation is straightforward: positional information from the touch driver is linearly interpolated to the output coordinate system. If the value is none , the size is set to zero. The default value is 1. The default value is 0.
If the value is 0 , the reported size will be used as is. Smartphone and touch phones are related concepts and are often confusing for many people. Touch phone is more of a feature than a classification. Touch phones are basically any phone that allows touch capabilities; it allows users to touch to access anything on their phone.
Many smartphone these days have full touch capability, classifying them as smartphones as well as touch phones. Smartphone is a mobile phone that operates on an operating system, similar to a mini computer. Smartphones are basically that — a mini computer. They offer a variety of features such as calling capabilities, computing capabilities, video conferencing, online surfing, cameras, media players, GPS navigation units, etc.
Any mobile phone that lets you do the work of a computer is considered as a smartphone. There is no clear distinction that decides which phones are smartphone and which phones are not.
By Elcotek. My Account. Track my order s. Sign in Register. Cart is empty. View cart. To know the differences between different type of parts available for Acer Android phone, we first need to know what is the function of each of these 3 components of the screen module. Typically less than one millimeter thick, the glass panel does not have a functionality and mostly serves as a protective layer to the screen module. When you tap your fingertip or swipe it across the screen, the digitizer senses it and sends data to the phone processor.
The digitizer pasted to the front glass together is called as a "Touch Screen". The display is the visual component underneath the glass that displays the image on the screen. Now, we can clearly differentiate between the 4 type of products which are usually sold for Acer Android phone.
Replacing the front glass of a screen module is a very technical procedure and requires lots of experience and machinery.
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