相机预览会话setRepeatingRequest焦点问题，只聚焦第一次ontouch [英] Camera Preview Session setRepeatingRequest focus issue, focuses only first time ontouch

问题描述

我有一个textureview，我已经实现了onuch监听器，我想当我触摸显示器，以便能够聚焦，但有一个问题，当设置setRepeatingRequest建立显示，它只有第一次时，我触摸，之后我可以触摸100x，但仍然没有效果，我想启用闪光对焦和捕获，但闪光灯保持所有的时间，因为相机不聚焦，请帮助我，我被卡住了5天在这个任务！

这是我的代码：
// meteringRectangleArr是我可以集中（计量）的区域

  mPreviewCaptureRequestBuilder.set（
 CaptureRequest.CONTROL_AF_TRIGGER，
 CaptureRequest.CONTROL_AF_TRIGGER_CANCEL）; 
 
 mPreviewCaptureRequestBuilder.set（
 CaptureRequest.CONTROL_AF_REGIONS，
 meteringRectangleArr）; 
 
 mPreviewCaptureRequestBuilder.set（
 CaptureRequest.CONTROL_AE_REGIONS，
 meteringRectangleArr）; 
 
 mPreviewCaptureRequestBuilder.set（CaptureRequest.CONTROL_MODE，
 CaptureRequest.CONTROL_MODE_AUTO）; 
 
 mPreviewCaptureRequestBuilder.set（CaptureRequest.CONTROL_AF_MODE，
 CaptureRequest.CONTROL_AF_MODE_AUTO）; 
 
 mPreviewCaptureRequestBuilder.set（
 CaptureRequest.CONTROL_AF_TRIGGER，
 CaptureRequest.CONTROL_AF_TRIGGER_START）; 
 
 if（flash_value == 1）{
 flash_startime = System.currentTimeMillis（）; 
 updateFlashingView（）; 
 mPreviewCaptureRequestBuilder.set（
 CaptureRequest.FLASH_MODE，
 CaptureRequest.FLASH_MODE_SINGLE）; 
} 
 
 else if（flash_value == 0）{
 mPreviewCaptureRequestBuilder.set（
 CaptureRequest.FLASH_MODE，
 CaptureRequest.FLASH_MODE_OFF）; 
} 
 
 try {
 
 mCameraCaptureSession.setRepeatingRequest（
 mPreviewCaptureRequestBuilder.build（），
 null，mBackgroundHandler）; 
 
} catch（CameraAccessException e）{
 // TODO自动生成的catch块
 e.printStackTrace（）; 
} 
  

解决方案

>

  mPreviewCaptureRequestBuilder.set（
 CaptureRequest.CONTROL_AF_TRIGGER，
 CaptureRequest.CONTROL_AF_TRIGGER_START）; 
  

您只能使用mCameraCaptureSession.capture调用CONTROL_AF_TRIGGER_START一次。

我分支形式 google的Camera2Basic示例，并将其更改为使用 CaptureRequest.CONTROL_AF_MODE_AUTO 而不是 CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE

从git并查看它的工作原理 - https://github.com/pinhassi/android-Camera2Basic

i have a textureview where i have implemented ontouch listener, i want when i touch the display to be able to focus, but there's a problem when setting setRepeatingRequest to build the display, it focuses only first time when i touch and after that i can touch 100x but still it has no effect, i want to enable flash on focusing and on capture but the flash stays on all the time as the camera does not focus, please help me, i'm stuck for 5 days at this task !

Here is my code : //meteringRectangleArr is the areas where i can focus (metering)

    mPreviewCaptureRequestBuilder.set(
                    CaptureRequest.CONTROL_AF_TRIGGER,
                    CaptureRequest.CONTROL_AF_TRIGGER_CANCEL);

                mPreviewCaptureRequestBuilder.set(
                        CaptureRequest.CONTROL_AF_REGIONS,
                        meteringRectangleArr);

                mPreviewCaptureRequestBuilder.set(
                    CaptureRequest.CONTROL_AE_REGIONS,
                        meteringRectangleArr);

                mPreviewCaptureRequestBuilder.set(CaptureRequest.CONTROL_MODE,
                        CaptureRequest.CONTROL_MODE_AUTO);

                mPreviewCaptureRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
                        CaptureRequest.CONTROL_AF_MODE_AUTO);

                mPreviewCaptureRequestBuilder.set(
                        CaptureRequest.CONTROL_AF_TRIGGER,
                        CaptureRequest.CONTROL_AF_TRIGGER_START);

                if(flash_value == 1){
                    flash_startime = System.currentTimeMillis();
                    updateFlashingView();
                    mPreviewCaptureRequestBuilder.set(
                            CaptureRequest.FLASH_MODE,
                            CaptureRequest.FLASH_MODE_SINGLE);
                }

                else if (flash_value == 0){
                    mPreviewCaptureRequestBuilder.set(
                            CaptureRequest.FLASH_MODE,
                            CaptureRequest.FLASH_MODE_OFF);
                }

                try {

                    mCameraCaptureSession.setRepeatingRequest(
                        mPreviewCaptureRequestBuilder.build(),
                        null, mBackgroundHandler);

                } catch (CameraAccessException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

解决方案

remove this:

mPreviewCaptureRequestBuilder.set(
                        CaptureRequest.CONTROL_AF_TRIGGER,
                        CaptureRequest.CONTROL_AF_TRIGGER_START);

you should call CONTROL_AF_TRIGGER_START only once, using mCameraCaptureSession.capture.

I branched form google's Camera2Basic example and changed it to use CaptureRequest.CONTROL_AF_MODE_AUTO instead of CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE

You can take the project from git and see how it works - https://github.com/pinhassi/android-Camera2Basic

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