android - 使用 Android Camera2，应用程序无限期卡在 STATE_WAITING_PRECAPTURE 或 STATE_WAITING_NON_PRECAPTURE

Question

我正在使用Android Camera2 API。我想知道什么时候是合适的时间：

1. 最初显示TakePicture按钮（即相机已准备好拍摄照片）。
2. 再次显示此按钮（如果拍照过程失败，当然完成后），因为我在单击它时将其隐藏（以捕获图片）。

我试过takePicture.setVisibility(View.GONE)了。lockFocus()_ 虽然这在大多数情况下都有效，但有时按钮会消失并且再也不会出现（我猜是当拍照过程失败时），尤其是在非常快速地单击它时（一旦它出现在屏幕上）。此时没有错误和崩溃发生。takePicture.setVisibility(View.VISIBLE)unlockFocus()

代码取自googlesamples/android-Camera2Basic。

更新：

takePicture.setVisibility(View.VISIBLE)我在里面试过onCaptureSequenceCompleted。该按钮确实出现了，但是单击它时不会重新启动捕获图片的过程（请参阅此七秒视频）。发生这种情况时，onCaptureFailed不会调用 。但是，它会无限期地陷入STATE_WAITING_PRECAPTURE或STATE_WAITING_NON_PRECAPTURE因为aeState不满足if条件而陷入困境。

           case STATE_WAITING_PRECAPTURE: {
                // CONTROL_AE_STATE can be null on some devices
                Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE);
                if (aeState == null ||
                        aeState == CaptureResult.CONTROL_AE_STATE_PRECAPTURE ||
                        aeState == CaptureRequest.CONTROL_AE_STATE_FLASH_REQUIRED) {
                    mState = STATE_WAITING_NON_PRECAPTURE;
                }
                break;
            }
            case STATE_WAITING_NON_PRECAPTURE: {
                // CONTROL_AE_STATE can be null on some devices
                Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE);
                if (aeState == null || aeState != CaptureResult.CONTROL_AE_STATE_PRECAPTURE) {
                    mState = STATE_PICTURE_TAKEN;
                    captureStillPicture();
                }
                break;
            }

标签： androidcameraandroid-cameraandroid-camera2

Answer 1

我觉得应该是这样的

 case STATE_WAITING_PRECAPTURE:
              {
                JQLog.d(TAG, "STATE_WAITING_PRECAPTURE");
                // CONTROL_AE_STATE can be null on some devices
                Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE);
                if (aeState == null
                    || aeState == CaptureResult.CONTROL_AE_STATE_PRECAPTURE
                    || aeState == CaptureRequest.CONTROL_AE_STATE_FLASH_REQUIRED
                    || aeState == CaptureResult.CONTROL_AE_STATE_CONVERGED) {
                  state = STATE_WAITING_NON_PRECAPTURE;
                }
                break;
              }