您在预览类中的Oncreate上调用了自动对焦，因此应该在创建曲面或更改曲面时调用它，因为一旦开始camerapreview就会发生自动对焦，请查看此代码，我已经对此进行了工作并且正在工作
private void tryAutoFocus() { if( MyDebug.LOG ) Log.d(TAG, "tryAutoFocus"); if( camera == null ) { if( MyDebug.LOG ) Log.d(TAG, "no camera"); } else if( !this.has_surface ) { if( MyDebug.LOG ) Log.d(TAG, "preview surface not yet available"); } else if( !this.is_preview_started ) { if( MyDebug.LOG ) Log.d(TAG, "preview not yet started"); } else if( is_taking_photo ) { if( MyDebug.LOG ) Log.d(TAG, "currently taking a photo"); } else { // if a focus area is set, we always call autofocus even if it isn't supported, so we get the focus box // otherwise, it's only worth doing it when autofocus has an effect (i.e., auto or macro mode) Camera.Parameters parameters = camera.getParameters(); String focus_mode = parameters.getFocusMode(); if( has_focus_area || focus_mode.equals(Camera.Parameters.FOCUS_MODE_AUTO) || focus_mode.equals(Camera.Parameters.FOCUS_MODE_MACRO) ) { if( MyDebug.LOG ) Log.d(TAG, "try to start autofocus"); Camera.AutoFocusCallback autoFocusCallback = new Camera.AutoFocusCallback() { @Override public void onAutoFocus(boolean success, Camera camera) { if( MyDebug.LOG ) Log.d(TAG, "autofocus complete: " + success); focus_success = success ? FOCUS_SUCCESS : FOCUS_FAILED; focus_complete_time = System.currentTimeMillis(); if(_automationStarted){ takeSnapPhoto(); } } }; this.focus_success = FOCUS_WAITING; this.focus_complete_time = -1; camera.autoFocus(autoFocusCallback); } }}public void surfaceCreated(SurfaceHolder holder) { if( MyDebug.LOG ) Log.d(TAG, "surfaceCreated()"); // The Surface has been created, acquire the camera and tell it where to draw. this.has_surface = true; this.openCamera(false); // if setting up for the first time, we wait until the surfaceChanged call to start the preview this.setWillNotDraw(false); // see http://stackoverflow.com/questions/2687015/extended-surfaceviews-ondraw-method-never-called}public void surfaceDestroyed(SurfaceHolder holder) { if( MyDebug.LOG ) Log.d(TAG, "surfaceDestroyed()"); // Surface will be destroyed when we return, so stop the preview. // Because the CameraDevice object is not a shared resource, it's very // important to release it when the activity is paused. this.has_surface = false; this.closeCamera();}public void takeSnapPhoto() { camera.setoneShotPreviewCallback(new Camera.PreviewCallback() { @Override public void onPreviewframe(byte[] data, Camera camera) { Camera.Parameters parameters = camera.getParameters(); int format = parameters.getPreviewFormat(); //YUV formats require more conversion if (format == ImageFormat.NV21 || format == ImageFormat.YUY2 || format == ImageFormat.NV16) { int w = parameters.getPreviewSize().width; int h = parameters.getPreviewSize().height; // Get the YuV image YuvImage yuv_image = new YuvImage(data, format, w, h, null); // Convert YuV to Jpeg Rect rect = new Rect(0, 0, w, h); ByteArrayOutputStream output_stream = new ByteArrayOutputStream(); yuv_image.compressToJpeg(rect, 100, output_stream); byte[] byt = output_stream.toByteArray(); FileOutputStream outStream = null; try { // Write to SD Card File file = createFileInSDCard(FOLDER_PATH, "Image_"+System.currentTimeMillis()+".jpg"); //Uri uriSavedImage = Uri.fromFile(file); outStream = new FileOutputStream(file); outStream.write(byt); outStream.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { } } } });}初始化相机时（或在这种情况下打开相机）
private void openCamera(boolean start_preview) { tryautofocus();//call this after setting camera parameters }
