简单的android Q 摄像头预览操作

CTS camera 测试里面有很多操作摄像头的用例, 可以借用来使用

比如: CaptureRequestTest#testFaceDetection

adb shell am instrument -r -e class android.hardware.camera2.cts.CaptureRequestTest#testFaceDetection -w android.camera.cts/androidx.test.runner.AndroidJUnitRunner

    /**     * Test face detection modes and results.     */    @Test    public void testFaceDetection() throws Exception {        for (int i = 0; i < mCameraIds.length; i++) {  循环打开前后摄            try {                if (!mAllStaticInfo.get(mCameraIds[i]).isColorOutputSupported()) {                    Log.i(TAG, "Camera " + mCameraIds[i] +                            " does not support color outputs, skipping");                    continue;                }                openDevice(mCameraIds[i]);  打开摄像头                faceDetectionTestByCamera();            } finally {                closeDevice(); 关闭当前摄像头            }        }    }

    private void faceDetectionTestByCamera() throws Exception {        int[] faceDetectModes = mStaticInfo.getAvailableFaceDetectModesChecked();        SimpleCaptureCallback listener;        CaptureRequest.Builder requestBuilder =                mCamera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);        Size maxPreviewSz = mOrderedPreviewSizes.get(0); // Max preview size.        for (int mode : faceDetectModes) {            设置人脸检测模式            requestBuilder.set(CaptureRequest.STATISTICS_FACE_DETECT_MODE, mode);            if (VERBOSE) {                Log.v(TAG, "Start testing face detection mode " + mode);            }            // Create a new listener for each run to avoid the results from one run spill            // into another run.            listener = new SimpleCaptureCallback();创建简单的capturecallback类型的listener            startPreview(requestBuilder, maxPreviewSz, listener); 开始预览            waitForSettingsApplied(listener, NUM_FRAMES_WAITED_FOR_UNKNOWN_LATENCY);            SystemClock.sleep(10000);睡眠10秒            删除以下这句,仅仅预览            //verifyFaceDetectionResults(listener, NUM_FACE_DETECTION_FRAMES_VERIFIED, mode);        }        stopPreview();关闭当前预览    }

    protected void startPreview(CaptureRequest.Builder request, Size previewSz,            CaptureCallback listener) throws Exception {        // Update preview size.        updatePreviewSurface(previewSz);        if (VERBOSE) {            Log.v(TAG, "start preview with size " + mPreviewSize.toString());        }        configurePreviewOutput(request);配置预览        把request, listener, mHandler 这几个关联起来        mSession.setRepeatingRequest(request.build(), listener, mHandler);    }

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