The process of adjusting an Android device’s touch interface ensures accurate and responsive interaction. Inaccurate touch input can lead to frustration and difficulty in using applications or navigating the operating system. This adjustment involves aligning the reported touch position with the actual physical location on the screen, thereby resolving discrepancies.
Precise touch input is critical for efficient device usage. Correcting touch screen inaccuracies enhances user experience by reducing errors and improving responsiveness. Historically, calibration tools were often included by device manufacturers to address variations in screen sensitivity and manufacturing tolerances. This adjustment extends the device’s usability and helps maintain its optimal functionality over time.
The subsequent sections will explore the methods for correcting touch input on Android devices, including built-in settings and third-party applications. Furthermore, troubleshooting steps for common issues that might necessitate recalibration will be discussed.
1. Screen Responsiveness
Screen responsiveness, characterized by the immediate and accurate registration of touch input, is fundamentally linked to the necessity of calibrating an Android device’s touch interface. When a user interacts with a touchscreen, the device’s digitizer is intended to translate the physical touch into corresponding actions within the operating system. Degradation in responsiveness, manifesting as delayed, inaccurate, or absent responses to touch events, often indicates a misalignment between the digitizer’s interpretation and the actual touch location. For instance, a user may tap an icon, but the device registers the touch slightly above or below the intended target. Such discrepancies can stem from manufacturing tolerances, software glitches, or prolonged usage, leading to a gradual decline in touch accuracy and overall screen responsiveness. Calibration seeks to rectify this misalignment by adjusting the touch sensor’s sensitivity and mapping coordinates, thereby restoring the expected level of interaction speed and precision.
The practical significance of understanding this relationship lies in the ability to diagnose and address performance issues effectively. Consider a scenario where a user experiences difficulty typing on the touchscreen keyboard due to frequent mis-keyed letters. This could indicate a calibration issue, prompting the user to initiate the adjustment process through the device’s settings or a dedicated calibration application. Moreover, calibration can also mitigate the impact of minor physical damage to the screen. While it cannot repair a cracked screen, it might partially compensate for touch insensitivity in affected areas, extending the device’s functional lifespan. In professional settings, where accuracy is paramount (e.g., graphic design or medical imaging applications), regular calibration becomes a critical maintenance task to ensure reliable and precise touch input.
In summary, compromised screen responsiveness often serves as a primary indicator necessitating touch screen calibration. Calibration provides a corrective mechanism, addressing underlying discrepancies between physical touch and digital registration. By understanding the interconnectedness of these factors, users can maintain optimal device performance, minimize errors, and extend the functional usability of their Android devices. Challenges may arise from hardware limitations or severe physical damage, which calibration alone cannot resolve, underscoring the importance of preventative care and timely intervention when responsiveness issues emerge.
2. Input Accuracy
Input accuracy, concerning Android devices, is the degree to which a touch command corresponds to the intended action on the screen. The precision of touch registration directly affects user experience and device functionality. Calibration serves as a mechanism to optimize this accuracy, addressing deviations that may arise due to various factors.
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Touch Registration Discrepancies
Discrepancies occur when the point of contact on the screen does not align with the registered input by the system. These discrepancies can stem from manufacturing variances in the touchscreen panel, software errors, or environmental factors affecting sensor sensitivity. Inaccurate touch registration can lead to unintended app selections, typing errors, and difficulty navigating menus. Calibration attempts to correct these inaccuracies by remapping the touch input to the intended locations on the screen, restoring precise control. For example, a user consistently presses the ‘A’ key on a virtual keyboard but receives ‘Q’ as the input; calibration adjusts the input map to align the ‘A’ touch position with the ‘A’ input, eliminating the error.
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Cumulative Effects of Wear and Tear
Over time, the performance of the touchscreen can degrade due to physical wear, exposure to extreme temperatures, or exposure to moisture. These factors may alter the electrical characteristics of the capacitive sensors, affecting their ability to accurately detect touch inputs. For example, repeated pressure on a specific area of the screen may cause that area to become less sensitive, leading to missed inputs. Calibration can partially compensate for this degradation by increasing sensitivity in affected regions or re-establishing the correct touch response curves. However, severe physical damage may necessitate hardware repair or replacement.
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Software and Firmware Deviations
Operating system updates or third-party applications can introduce bugs or compatibility issues that negatively impact touch input accuracy. Conflicts between the touchscreen driver and the device’s firmware may result in inconsistent or inaccurate touch responses. Calibration can help mitigate these software-related issues by resetting the touch input parameters and restoring a baseline level of accuracy. If software bugs are the root cause, updates or application patches may be necessary to fully resolve the problem. The ability to recalibrate offers a temporary fix while a more permanent solution is found.
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Influence of Screen Protectors and Accessories
The use of screen protectors or other accessories can impede touch input accuracy by introducing an additional layer of material between the user’s finger and the touchscreen surface. Thicker or poorly designed screen protectors may reduce sensitivity, introduce ghost touches, or distort the detected touch points. Calibration can compensate for some of these effects by adjusting the sensitivity and response characteristics of the touchscreen. However, the effectiveness of calibration in these cases is limited, and it is recommended to use accessories specifically designed to maintain touch sensitivity and accuracy. High-quality screen protectors with appropriate adhesive properties can minimize the impact on input accuracy.
The need to optimize input accuracy underlines the importance of being able to initiate calibration on Android devices. The factors described above all demonstrate situations in which touch input can stray from the intended behavior. Calibration can offer some correction, allowing a user to regain device functionality and minimize frustrating errors.
3. User Experience
User experience, in the context of Android devices, is significantly affected by the accuracy and responsiveness of the touch screen. A properly calibrated touch screen is integral to ensuring a seamless and intuitive interaction, impacting overall user satisfaction. Calibration directly influences the perceived quality and efficiency of device operation.
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Navigation and Control Precision
Accurate navigation relies on precise touch input. Misaligned touch coordinates can lead to unintended selections, difficulty in accessing specific features, and frustration during basic operations such as scrolling or selecting items. Recalibration addresses these inaccuracies, restoring the intended level of control and making navigation smooth and intuitive. For example, tapping a small icon in an app becomes easier and more accurate after calibration.
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Typing Accuracy and Efficiency
The virtual keyboard is a primary input method on Android devices. A poorly calibrated touch screen can result in frequent typing errors, requiring constant corrections and reducing typing speed. Calibration ensures that each key press registers accurately, improving typing efficiency and reducing frustration. Imagine the difference between accurately typing a password on the first try versus struggling through multiple attempts due to misregistered inputs.
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Gaming Performance and Immersion
Many Android games rely heavily on precise touch controls for actions such as aiming, moving, and interacting with the game environment. Inaccurate touch input can lead to missed shots, incorrect movements, and a diminished gaming experience. Calibration improves the responsiveness and accuracy of touch controls, enhancing gaming performance and increasing immersion. Precise control during fast-paced gaming sequences can make the difference between winning and losing.
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Accessibility for Users with Motor Impairments
For individuals with motor impairments, accurate touch input is essential for effective device usage. Calibration can compensate for tremors or limited dexterity, making it easier to interact with the device and access its features. By customizing touch sensitivity and adjusting input mapping, calibration can improve accessibility and empower users with disabilities to use their devices more independently and effectively.
These facets demonstrate how calibration is central to user experience. By optimizing navigation, typing, gaming, and accessibility, it improves overall usability. These improvements translate directly to user satisfaction and device acceptance. While routine device maintenance often overlooks calibration, it represents a simple method to ensure optimal performance, therefore, making user experience benefits possible.
4. Device Longevity
Touchscreen calibration, though seemingly a minor adjustment, contributes tangibly to the prolonged operational life of an Android device. Repeatedly compensating for inaccurate touch registration through forceful or multiple touches places undue stress on the digitizer and underlying hardware. Such compensatory actions can accelerate the wear and tear on the touch-sensitive components, potentially leading to premature failure. Regular calibration mitigates this by ensuring that even light, accurate touches are correctly interpreted, thereby reducing the physical strain on the screen and its internal components. An analogous situation exists with a car’s wheel alignment; misalignment leads to uneven tire wear, whereas proper alignment distributes the wear evenly, extending the lifespan of the tires. Touchscreen calibration provides a similar benefit, ensuring uniform pressure distribution and minimizing concentrated wear spots.
Furthermore, addressing touch inaccuracies through calibration can indirectly prevent software-related issues that might necessitate a device reset or factory restore. Persistent input errors can trigger glitches within applications, leading to crashes or data corruption. While not directly related to the hardware, these software problems can prompt users to perform drastic measures like resetting the device, which, though effective in resolving the software issue, can also negatively impact battery life due to the energy consumed during the reset process and subsequent app reinstallation. Moreover, frequent factory resets can contribute to flash memory degradation, limiting the device’s overall lifespan. By maintaining a properly calibrated touchscreen, the likelihood of software issues stemming from inaccurate input is minimized, indirectly preserving both the software integrity and the hardware longevity of the device.
In summary, the connection between touchscreen calibration and device longevity is twofold. First, calibration reduces the physical stress on the touch screen components, minimizing wear and tear. Second, it helps prevent software issues that can lead to device resets and subsequent strain on other hardware components. Addressing touch inaccuracies early, through calibration, serves as a proactive measure, extending device lifespan and minimizing the need for more drastic interventions. Hardware limitations and obsolescence remain inevitable, but proper maintenance, including regular touchscreen calibration, can optimize the device’s operational lifespan and delay the need for replacement.
5. Application Performance
Application performance on Android devices is intrinsically linked to the accuracy of touch input. Inaccurate touch registration can degrade the responsiveness and usability of applications, affecting user productivity and overall satisfaction. A correctly calibrated touch screen is vital for optimal application functionality.
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Responsiveness and Input Lag
Inaccurately registered touch events can introduce delays in application responses. Input lag, the time between a user’s touch and the corresponding action within the application, can stem from a misaligned touch screen interpreting gestures incorrectly. This lag impairs the user experience, especially in applications demanding quick responses, such as games or real-time control systems. Calibration seeks to minimize this lag by ensuring that touch inputs are immediately and accurately translated into application commands. Consider a music application where a delayed touch response on a play button results in missed beats or delayed track transitions.
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Graphical Rendering Accuracy
Many applications, particularly those involving graphics or design, rely on precise touch input for manipulation and control. Inaccurate touch registration can distort drawings, misplace objects, or create rendering errors. Calibration corrects these discrepancies by aligning touch coordinates with the screen’s pixel grid, ensuring accurate graphical rendering and manipulation. For instance, a graphic design application may display misplaced lines or imprecise object placement if the touch screen is not accurately calibrated.
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Data Entry and Form Completion
Applications requiring data entry, such as forms or spreadsheets, are heavily dependent on precise touch input for accurate data entry. Misregistered touch events can lead to typos, incorrect data entries, and increased error rates. Calibration ensures that virtual keyboard inputs are accurately registered, minimizing data entry errors and improving form completion efficiency. A spreadsheet application, for example, may register the incorrect numerical values if the touch screen is misaligned, leading to inaccurate calculations and analysis.
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Gesture Recognition and Navigation
Many Android applications utilize gesture-based controls for navigation and command execution. Inaccurate touch registration can impair the application’s ability to correctly interpret these gestures, leading to unintended actions or navigation errors. Calibration ensures that gestures are accurately recognized, improving the intuitiveness and efficiency of application navigation. For example, a web browser might not correctly interpret a swipe gesture to navigate back to the previous page if the touch screen is misaligned, disrupting the browsing experience.
The aforementioned facets underscore the importance of touch screen calibration for application performance. Addressing inaccuracies in touch registration enhances application responsiveness, graphical rendering, data entry, and gesture recognition, ultimately improving user experience and productivity. Although software optimization and hardware capabilities play important roles in application performance, accurate touch input is a fundamental requirement that calibration addresses directly. Calibration should, therefore, be considered a vital maintenance procedure for Android devices to sustain optimal application functionality.
6. Calibration Tools
Calibration tools are essential components for adjusting the sensitivity and accuracy of a touchscreen. They facilitate aligning the reported touch coordinates with the actual physical location on the screen, thereby correcting deviations and optimizing touch input.
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Built-in System Settings
Android operating systems often include integrated calibration options within the device settings. These options typically guide the user through a series of touch targets, allowing the system to learn and compensate for inaccuracies. For example, a device might prompt the user to tap several points across the screen, registering deviations and automatically adjusting the touch response map. The absence or limitation of these built-in tools on some devices necessitates exploring alternative methods.
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Third-Party Applications
Numerous applications available on app stores offer advanced calibration functionalities. These apps often provide finer control over touch sensitivity, pressure mapping, and gesture recognition. They may include features such as drawing tools to assess accuracy or heatmaps to visualize touch sensitivity across the screen. As an example, a user experiencing persistent inaccuracies could employ a third-party calibration app to manually adjust the touch response curve, achieving greater precision than the built-in options allow.
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Developer Options and Debugging Tools
For advanced users, developer options within Android can provide access to debugging tools that offer even greater control over touch input. These tools may allow for detailed analysis of touch data, manual adjustment of touch parameters, and custom calibration profiles. For instance, developers testing touch-based applications can use these tools to fine-tune touch response and ensure optimal performance across various devices. However, improper use of these tools can destabilize the system, requiring caution.
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Hardware Diagnostics and Testing Utilities
Some manufacturers provide hardware diagnostics and testing utilities that include touch screen calibration routines. These tools are often used in service centers to assess and correct touch screen issues. They may involve automated tests that evaluate touch accuracy, pressure sensitivity, and response time. An example is a diagnostic tool that detects areas of the screen with reduced sensitivity, prompting a hardware repair or recalibration. These utilities are typically not available to end-users.
These calibration tools, while varying in their accessibility and complexity, share the common goal of optimizing touch input on Android devices. Their effective use can improve user experience, enhance application performance, and potentially extend device longevity by reducing the need for forceful or repeated touches. Selecting the appropriate calibration tool depends on the user’s technical expertise and the severity of the touch accuracy issue.
7. Screen Sensitivity
Screen sensitivity, defined as the responsiveness of a touch screen to physical contact, directly dictates the need for adjusting Android devices. Reduced sensitivity necessitates increased pressure for touch registration, leading to a degraded user experience. Calibration seeks to re-establish optimal sensitivity levels, ensuring accurate and responsive touch input. For example, a screen with decreased sensitivity may require multiple or forceful touches for input, which calibration aims to correct. A common scenario where sensitivity is affected is when a screen protector is installed. Calibration can compensate for the added layer to restore appropriate responsiveness. Without adequate sensitivity, even basic actions like typing become cumbersome, underlining the critical role of this factor in device usability.
Conversely, excessive screen sensitivity can result in unintended touch registrations or ‘ghost touches,’ further disrupting the user experience. Calibration procedures address this by fine-tuning the touch detection threshold, minimizing false inputs. This is particularly important for devices used in environments prone to interference, such as humid or dusty conditions. For instance, a tablet used in a workshop may experience unintended touch events due to airborne particles affecting screen sensitivity. Calibration mitigates these errors, ensuring accurate touch registration even under challenging circumstances. Practical applications include stabilizing touch input for drawing applications or preventing accidental clicks during video playback.
In summary, screen sensitivity is a core component influencing the necessity and effectiveness of Android adjustment. Calibration serves as a mechanism to address both insufficient and excessive sensitivity, optimizing touch input for various usage scenarios. While external factors such as screen protectors or environmental conditions can affect screen sensitivity, the ability to calibrate helps maintain a consistent and reliable touch experience. The challenge lies in providing users with intuitive and accessible tools to fine-tune screen sensitivity according to their individual preferences and usage patterns. Correctly set sensitivity leads to a more efficient and pleasant interaction with the device.
8. Touch Latency
Touch latency, the delay between a touch input and the corresponding on-screen reaction, is a critical factor influencing user experience. This latency is closely associated with the accuracy and precision that is addressed through adjustment of Android devices. Minimizing touch latency is essential for seamless interaction, particularly in applications requiring quick responses.
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Digitizer Response Time
The digitizer’s capacity to rapidly detect and translate touch input directly influences latency. Slower digitizers introduce significant delays, which users perceive as sluggishness. Adjustment of Android devices cannot fundamentally alter a digitizer’s inherent response time; however, optimizing software processes can partially mitigate the effect. For instance, ensuring the operating system prioritizes touch input processing can reduce the perceived delay. In situations where the digitizer is the primary source of latency, hardware upgrades may be necessary.
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Software Processing Overhead
The Android operating system and running applications require processing touch events, which introduces overhead. Excessive background processes or inefficient code can increase this overhead, extending latency. Adjustment of Android devices includes optimizing system settings to minimize background activity and resource consumption. For example, disabling unnecessary animations or reducing the number of active applications can reduce software processing overhead. The impact of software processing on latency is most noticeable on devices with limited processing power.
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Driver Efficiency and Accuracy
Touchscreen drivers translate raw input from the digitizer into actionable commands for the operating system. Inefficient or inaccurate drivers can introduce delays or misinterpret touch events, leading to increased latency. While drivers are generally pre-installed, updates can sometimes improve efficiency and accuracy. Adjustment of Android devices may involve manually updating or replacing touchscreen drivers. However, compatibility issues may arise, necessitating caution. Older or unsupported devices may lack updated drivers, limiting the effectiveness of this approach.
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Display Refresh Rate
The display refresh rate determines how quickly the screen updates, affecting the perceived touch latency. Lower refresh rates result in a noticeable delay between input and visual feedback. While adjustment of Android devices typically focuses on touch input parameters, optimizing display settings can indirectly reduce perceived latency. For example, enabling higher refresh rate modes, if available, can improve responsiveness. The effect of refresh rate on latency is most pronounced in applications involving rapid movements or animations, such as games or drawing applications.
These elements demonstrate that touch latency is not solely attributable to touchscreen inaccuracies that are directly corrected through adjustment of an Android device. Software optimization, driver efficiency, digitizer response time, and refresh rate all contribute significantly. While adjustment primarily aims to improve touch accuracy, it also has an impact on reducing the overall latency experienced by users. Balancing all the aforementioned aspects results in improved responsiveness, creating a more seamless and interactive user experience.
9. Hardware Variations
Android devices exhibit considerable hardware variations, influencing touch screen behavior and subsequently affecting adjustment. Differences in digitizer technology, screen materials, and manufacturing tolerances necessitate individual adjustment routines for optimal performance. Devices employing different touchscreen manufacturers may exhibit variations in native sensitivity and linearity, directly impacting the accuracy of touch input. For instance, a high-end device with a premium digitizer may require minimal adjustment, while a budget device may need more extensive correction to achieve acceptable responsiveness. The physical construction of the device, including the thickness and composition of the screen layers, also contributes to these variations. These intrinsic hardware differences directly impact the sensitivity and linearity of touch response, therefore, emphasizing the need for adjustment procedures tailored to each unique device model.
Manufacturing inconsistencies further amplify the influence of hardware variations on touch screen performance. Slight misalignments of the digitizer relative to the display panel, variations in sensor density, or inconsistencies in the adhesive bonding process can all contribute to inaccuracies. Adjustment routines compensate for these manufacturing imperfections by mapping touch coordinates to account for the physical distortions present in individual units. A practical example of this is the common need to adjust touch screen sensitivity differently across devices, even within the same product line. This is because slight shifts in manufacturing, like a slightly different application of the screen adhesive, can subtly alter how pressure transmits from the users finger to the sensor beneath. Similarly, varying operating temperatures and humidity levels can affect touchscreen behavior, leading to temporary deviations from the factory calibration and requiring periodic adjustment. These factors underline the necessity for flexible and adaptable adjustment algorithms.
In conclusion, hardware variations represent a critical component affecting the need for and implementation of the adjustment process for Android touch screens. From intrinsic differences in digitizer technology to manufacturing inconsistencies, these variations necessitate tailored adjustment routines to ensure accurate and responsive touch input across a wide range of devices. While adjustment can mitigate some of these variations, fundamental hardware limitations may preclude achieving perfect accuracy on all devices. Therefore, understanding the underlying hardware characteristics is crucial for developing effective adjustment algorithms and optimizing touch screen performance. The challenge lies in creating robust and adaptable processes capable of accommodating the diverse hardware landscape of the Android ecosystem, thereby ensuring a consistent and satisfying user experience across all devices.
Frequently Asked Questions
The following addresses common inquiries regarding the calibration of Android touch screens. This information is intended to provide clarity and guidance on maintaining optimal touch screen performance.
Question 1: Is touch screen calibration a permanent fix for a damaged screen?
Calibration is not a permanent solution for a physically damaged touch screen. While it can compensate for minor inaccuracies caused by wear or software issues, it cannot repair cracks, dead pixels, or significant hardware malfunctions. If physical damage is present, hardware repair or screen replacement is recommended.
Question 2: Does every Android device require manual touch screen calibration?
Not all Android devices necessitate manual calibration. Many devices are factory-calibrated and designed to maintain accuracy without user intervention. However, if experiencing persistent touch input issues, calibration might be beneficial.
Question 3: Can touch screen calibration improve battery life?
Calibration primarily affects touch input accuracy, not battery life directly. However, by correcting inaccurate touch registration, it can reduce the need for repeated touches and thus indirectly minimize battery consumption associated with screen usage.
Question 4: Are third-party calibration apps safer than using built-in settings?
The safety of using third-party calibration applications depends on the app’s source and reputation. It is advisable to download apps from trusted sources and review user ratings and permissions before installation. Built-in settings, when available, are generally considered safer as they are integrated with the device’s operating system.
Question 5: How frequently should an Android touch screen be calibrated?
There is no set frequency for calibration. Recalibration should be considered only when experiencing noticeable touch input inaccuracies. Factors such as device usage, environmental conditions, and the presence of screen protectors can influence the need for periodic calibration.
Question 6: Can a factory reset replace the need for touch screen calibration?
A factory reset restores the device to its original software state but does not directly affect touch screen calibration settings. It may resolve software-related touch input issues but will not address hardware-related inaccuracies. Calibration may still be necessary after a factory reset if hardware-related touch problems persist.
In summary, touch screen calibration is a tool for refining touch input accuracy. It is not a universal solution and should be used judiciously, considering the device’s condition and specific touch input issues.
The following section provides troubleshooting tips for common touch screen issues that may or may not require recalibration.
Tips for Touch Screen Maintenance
The following guidelines provide steps to optimize and maintain Android device touch screens, addressing common issues and minimizing the need for frequent adjustment.
Tip 1: Clean the Touch Screen Regularly
Accumulated dirt, oil, and debris can impede touch sensitivity. Use a soft, lint-free cloth to gently clean the screen. Avoid abrasive materials or harsh chemicals that may damage the screen’s surface. Regularly cleaning the screen ensures consistent touch response.
Tip 2: Remove Screen Protectors Judiciously
Screen protectors can sometimes interfere with touch sensitivity, particularly if they are of low quality or improperly installed. If experiencing persistent touch issues, temporarily remove the screen protector to assess whether it is the cause. Use only screen protectors designed specifically for the device model.
Tip 3: Optimize Device Performance
Excessive background processes and low device memory can affect overall responsiveness, including touch input. Close unused applications and clear cached data to optimize device performance. Regularly restarting the device can also improve responsiveness.
Tip 4: Avoid Extreme Temperatures
Extreme temperatures can affect touch screen sensitivity and accuracy. Avoid exposing the device to direct sunlight for extended periods or using it in very cold environments. Extreme temperatures can temporarily or permanently damage the touch screen components.
Tip 5: Update Operating System Regularly
Operating system updates often include bug fixes and performance improvements that can enhance touch screen responsiveness. Ensure the device is running the latest available operating system version. Keeping the operating system up-to-date also helps address potential driver incompatibilities.
Tip 6: Check for Software Conflicts
Certain applications can interfere with touch screen functionality. If experiencing touch issues after installing a new application, try uninstalling it to see if the problem resolves. Software conflicts can sometimes manifest as intermittent touch unresponsiveness.
Tip 7: Consider Professional Inspection
If touch screen issues persist despite implementing the above tips, a hardware problem may be present. Consider seeking professional inspection from a qualified technician. Hardware repairs or component replacements may be necessary to restore optimal functionality.
By implementing these maintenance practices, users can prolong the lifespan and maintain the responsiveness of their Android device touch screens. Consistent adherence to these guidelines minimizes the need for frequent adjustment and ensures a satisfactory user experience.
The following final section summarizes key points.
Conclusion
The preceding exploration outlined the nuances associated with touch screen adjustment on Android devices. Key areas of focus included factors influencing touch accuracy, various calibration tools, the effect of screen sensitivity and touch latency, and hardware variations. Maintenance tips were also provided to ensure consistent performance and minimize the need for frequent adjustment. This information empowers users to understand, identify, and address common touch input issues.
Effective touch screen performance is crucial for optimal device functionality. While software and hardware limitations may restrict the extent of improvement achievable through adjustment, adherence to these guidelines can enhance user experience and device longevity. Consistent maintenance and appropriate recalibration strategies will help maintain optimal touch screen performance for the duration of the device’s lifespan. In cases where hardware limitations make it impossible to regain optimal performance of how to calibrate an android touch screen is the main problem.
