第7讲 hardware level详解 -凯发k8手机登录

本讲是android camera专题系列的第7讲，我们介绍android camera2 api专题的camera hardware level详解部分。

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为什么要判断是否支持某个feature

app需要兼容不同的平台、不同的camera硬件设备

实战经验：任何camera的功能，在使用前都必须动态判断是否支持

camera hardware level

hardware level从宏观上描述camera设备具备的能力等级。每一个等级都是在前一个等级上增加更多的功能。

legacy < limited < full < level_3

如何判断是否支持某个camera hardware level

// returns true if the device supports the required hardware level, or better.
 boolean ishardwarelevelsupported(cameracharacteristics c, int requiredlevel) {
     final int[] sortedhwlevels = {
         cameracharacteristics.info_supported_hardware_level_legacy,
         cameracharacteristics.info_supported_hardware_level_external,
         cameracharacteristics.info_supported_hardware_level_limited,
         cameracharacteristics.info_supported_hardware_level_full,
         cameracharacteristics.info_supported_hardware_level_3
     };
     int devicelevel = c.get(cameracharacteristics.info_supported_hardware_level);
     if (requiredlevel == devicelevel) {
         return true;
     }
     for (int sortedlevel : sortedhwlevels) {
         if (sortedlevel == requiredlevel) {
             return true;
         } else if (sortedlevel == devicelevel) {
             return false;
         }
     }
     return false; // should never reach here
 }