{"id":26728,"date":"2024-03-16T07:12:22","date_gmt":"2024-03-16T07:12:22","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-use-velocitytracker-in-android-basic-knowledge\/"},"modified":"2024-03-22T09:17:19","modified_gmt":"2024-03-22T09:17:19","slug":"how-to-use-velocitytracker-in-android-basic-knowledge","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-use-velocitytracker-in-android-basic-knowledge\/","title":{"rendered":"How to Use VelocityTracker in Android Basic Knowledge"},"content":{"rendered":"

VelocityTracker is a tool class in Android used to track the speed of touch events. It can be used to calculate the speed of touch events within a specified time interval, as well as the speed between two touch events.<\/p>\n

The basic steps for using VelocityTracker are as follows:<\/p>\n

    \n
  1. Initialize a VelocityTracker object, which can be created within the onCreate() method of an Activity.<\/li>\n<\/ol>\n
    VelocityTracker<\/span> velocityTracker<\/span> =<\/span> VelocityTracker.obtain();\r\n<\/code><\/pre>\n
      \n
    1. Use VelocityTracker to track the velocity in the handling of touch events.<\/li>\n<\/ol>\n
      @Override<\/span>\r\npublic<\/span> boolean<\/span> onTouchEvent<\/span>(MotionEvent event)<\/span> {\r\n    \/\/ \u5c06\u89e6\u6478\u4e8b\u4ef6\u4f20\u9012\u7ed9VelocityTracker<\/span>\r\n    velocityTracker.addMovement(event);\r\n    \/\/ \u5904\u7406\u89e6\u6478\u4e8b\u4ef6<\/span>\r\n    \/\/ ...<\/span>\r\n    return<\/span> true<\/span>;\r\n}\r\n<\/code><\/pre>\n
        \n
      1. Call the computeCurrentVelocity() method of VelocityTracker to calculate the speed at places where speed calculation is needed, such as when a touch event ends.<\/li>\n<\/ol>\n
        @Override<\/span>\r\npublic<\/span> boolean<\/span> onTouchEvent<\/span>(MotionEvent event)<\/span> {\r\n    \/\/ \u5904\u7406\u89e6\u6478\u4e8b\u4ef6<\/span>\r\n    \/\/ ...<\/span>\r\n    if<\/span> (event.getAction() == MotionEvent.ACTION_UP) {\r\n        \/\/ \u8ba1\u7b97\u901f\u5ea6<\/span>\r\n        velocityTracker.computeCurrentVelocity(1000<\/span>); \/\/ 1000\u8868\u793a\u65f6\u95f4\u95f4\u9694\uff0c\u5355\u4f4d\u4e3a\u6beb\u79d2<\/span>\r\n        \/\/ \u83b7\u53d6X\u8f74\u548cY\u8f74\u65b9\u5411\u4e0a\u7684\u901f\u5ea6<\/span>\r\n        float<\/span> xVelocity<\/span> =<\/span> velocityTracker.getXVelocity();\r\n        float<\/span> yVelocity<\/span> =<\/span> velocityTracker.getYVelocity();\r\n        \/\/ \u5904\u7406\u901f\u5ea6<\/span>\r\n        \/\/ ...<\/span>\r\n    }\r\n    return<\/span> true<\/span>;\r\n}\r\n<\/code><\/pre>\n
          \n
        1. VelocityTracker objects need to be recycled when no longer in use.<\/li>\n<\/ol>\n
          @Override<\/span>\r\nprotected<\/span> void<\/span> onDestroy<\/span>()<\/span> {\r\n    super<\/span>.onDestroy();\r\n    \/\/ \u56de\u6536VelocityTracker\u5bf9\u8c61<\/span>\r\n    velocityTracker.recycle();\r\n}\r\n<\/code><\/pre>\n
          Important points to note:<\/p>\n
            \n
          1. When using VelocityTracker, it is important to ensure that there is only one VelocityTracker object in each touch event sequence.<\/li>\n
          2. Before calculating the speed, it is necessary to call the computeCurrentVelocity() method, which will calculate the speed within the specified time interval.<\/li>\n
          3. If you are no longer using the VelocityTracker object, you need to call the recycle() method to recycle it for future reuse.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
            VelocityTracker is a tool class in Android used to track the speed of touch events. It can be used to calculate the speed of touch events within a specified time interval, as well as the speed between two touch events. The basic steps for using VelocityTracker are as follows: Initialize a VelocityTracker object, which can […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-26728","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nHow to Use VelocityTracker in Android Basic Knowledge - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-to-use-velocitytracker-in-android-basic-knowledge\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Use VelocityTracker in Android Basic Knowledge\" \/>\n<meta property=\"og:description\" content=\"VelocityTracker is a tool class in Android used to track the speed of touch events. 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