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哪些网站seo做的好,郑州企业网站seo,西安网站建设公司平台,建设建设网站的我正在使用新的相机API(camera2)在android 5.0.2上创建一个应用程序.该应用程序每2.5秒拍摄一张照片,持续3个小时(总共4320张照片).正如您在下面的代码中看到的那样,我使用“ timer”对重复的内容进行编码,而没有针对Capture picture without preview using camera2 API的预览.…

我正在使用新的相机API(camera2)在android 5.0.2上创建一个应用程序.该应用程序每2.5秒拍摄一张照片,持续3个小时(总共4320张照片).正如您在下面的代码中看到的那样,我使用“ timer”对重复的内容进行编码,而没有针对Capture picture without preview using camera2 API的预览.我正在使用NEXUS7 2013 16G 5.0.2进行测试.它对于开头的200-300张图片正常工作,并失败,并显示以下错误消息.失败总是以“ E / RequestThread-1：jpeg回调的命中超时！”开始,它必须触发某些事件.有人会帮助摆脱这种触发吗？否则,如果是Android Bug,这将在5.1.0中修复？

03-30 15:46:04.472 11432-11432/com.example.android.camera2basic V/yo click﹕ ---- 174 ---- click

03-30 15:46:05.026 11432-11537/com.example.android.camera2basic E/RequestThread-1﹕ Hit timeout for jpeg callback!

03-30 15:46:05.027 11432-11537/com.example.android.camera2basic W/CaptureCollector﹕ Jpeg buffers dropped for request: 173

03-30 15:46:05.076 11432-11480/com.example.android.camera2basic E/CameraDevice-JV-1﹕ Lost output buffer reported for frame 173

03-30 15:46:05.090 11432-11537/com.example.android.camera2basic W/LegacyRequestMapper﹕ convertRequestMetadata - control.awbRegions setting is not supported, ignoring value

03-30 15:46:05.090 11432-11537/com.example.android.camera2basic W/LegacyRequestMapper﹕ Only received metering rectangles with weight 0.

03-30 15:46:05.091 11432-11537/com.example.android.camera2basic W/LegacyMetadataMapper﹕ convertAfModeToLegacy - ignoring unsupported mode 4, defaulting to fixed

03-30 15:46:05.091 11432-11537/com.example.android.camera2basic W/LegacyRequestMapper﹕ convertRequestToMetadata - Ignoring android.lens.focusDistance false, only 0.0f is supported

03-30 15:46:05.098 11432-11537/com.example.android.camera2basic E/AndroidRuntime﹕ FATAL EXCEPTION: RequestThread-1

Process: com.example.android.camera2basic, PID: 11432

java.lang.RuntimeException: startPreview failed

at android.hardware.Camera.startPreview(Native Method)

at android.hardware.camera2.legacy.RequestThreadManager.startPreview(RequestThreadManager.java:275)

at android.hardware.camera2.legacy.RequestThreadManager.doJpegCapturePrepare(RequestThreadManager.java:288)

at android.hardware.camera2.legacy.RequestThreadManager.access$1700(RequestThreadManager.java:61)

at android.hardware.camera2.legacy.RequestThreadManager$5.handleMessage(RequestThreadManager.java:767)

at android.os.Handler.dispatchMessage(Handler.java:98)

at android.os.Looper.loop(Looper.java:135)

at android.os.HandlerThread.run(HandlerThread.java:61)

这是我的代码：

public class CameraActivity extends Activity {

Timer mTimer = null;

Handler mHandler = new Handler();

private ImageReader imageReader;

private Handler backgroundHandler;

private HandlerThread backgroundThread;

private String cameraId;

private CameraDevice cameraDevice;

private CameraCaptureSession cameraCaptureSession;

static int count = 0;

static int count2 = 0;

/**

* Conversion from screen rotation to JPEG orientation.

private static final SparseIntArray ORIENTATIONS = new SparseIntArray();

static {

ORIENTATIONS.append(Surface.ROTATION_0, 90);

ORIENTATIONS.append(Surface.ROTATION_90, 0);

ORIENTATIONS.append(Surface.ROTATION_180, 270);

ORIENTATIONS.append(Surface.ROTATION_270, 180);

}

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//setContentView(R.layout.activity_camera);

setContentView(R.layout.activity_main);

Button takePicture = (Button)findViewById(R.id.takepic);

takePicture.setOnClickListener(onClickPicture);

//(1) setting up camera but stop before camera createCaptureRequest

setupCamera2();

}

private void setupCamera2() {

CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);

try {

for (String cameraId : manager.getCameraIdList()) {

CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);

//if (characteristics.get(CameraCharacteristics.LENS_FACING) != CameraCharacteristics.LENS_FACING_BACK) {

if (characteristics.get(CameraCharacteristics.LENS_FACING) != CameraCharacteristics.LENS_FACING_FRONT) {

continue;

}

StreamConfigurationMap configs = characteristics.get(

CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);

this.cameraId = cameraId;

manager.openCamera(this.cameraId, cameraStateCallback, backgroundHandler);

Size[] sizes = configs.getOutputSizes(ImageFormat.JPEG);

int picWidth = 640;//1920;

int picHeight = 480;//1080;

imageReader = ImageReader.newInstance(picWidth, picHeight, ImageFormat.JPEG, 2);

imageReader.setOnImageAvailableListener(onImageAvailableListener, backgroundHandler);

}

} catch (CameraAccessException | NullPointerException e) {

e.printStackTrace();

}

private final CameraDevice.StateCallback cameraStateCallback = new CameraDevice.StateCallback() {

@Override

public void onOpened(CameraDevice device) {

cameraDevice = device;

//(2) Camera capture session

createCameraCaptureSession();

}

@Override

public void onDisconnected(CameraDevice cameraDevice) {}

@Override

public void onError(CameraDevice cameraDevice, int error) {}

};

//private void createCaptureSession() {

private void createCameraCaptureSession() {

List outputSurfaces = new LinkedList<>();

outputSurfaces.add(imageReader.getSurface());

Log.v("-yo(2)-", "in createcameraCaptureSession now");

try {

cameraDevice.createCaptureSession(outputSurfaces, new CameraCaptureSession.StateCallback() {

@Override

public void onConfigured(CameraCaptureSession session) {

//cameraCaptureSession = session;

cameraCaptureSession = session;

//commented out to invoked from button

//createCaptureRequest();

}

@Override

public void onConfigureFailed(CameraCaptureSession session) {}

}, null);

} catch (CameraAccessException e) {

e.printStackTrace();

}

private final ImageReader.OnImageAvailableListener onImageAvailableListener = new ImageReader.OnImageAvailableListener() {

@Override

public void onImageAvailable(ImageReader reader) {

//createCaptureRequest();

Log.v("yo ireader ","---- "+(count2++)+" ---- ireader");

//Image mImage = imageReader.acquireLatestImage();

Image mImage = reader.acquireLatestImage();

File mFile = new File(Environment.getExternalStorageDirectory() + "/yP2PTEST/0P2Pimage.jpg");

Log.v("--yo--", "In ImageReader now writing to "+mFile);

ByteBuffer buffer = mImage.getPlanes()[0].getBuffer();

byte[] bytes = new byte[buffer.remaining()];

buffer.get(bytes);

FileOutputStream output = null;

try {

output = new FileOutputStream(mFile);

output.write(bytes);

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally {

mImage.close();

if (null != output) {

try {

output.close();

} catch (IOException e) {

e.printStackTrace();

}

ImageView curPic = (ImageView)findViewById(R.id.imageView1);

Bitmap mCurrentBitmap = BitmapFactory.decodeFile(mFile.getPath());

curPic.setImageBitmap(mCurrentBitmap);

}

///

};

private void createCaptureRequest() {

Log.v("-yo(3)-", "in createCaptureRequest now");

try {

CaptureRequest.Builder requestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);

requestBuilder.addTarget(imageReader.getSurface());

// Focus

requestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);

// Orientation

//yo int rotation = windowManager.getDefaultDisplay().getRotation();

int rotation = this.getWindowManager().getDefaultDisplay().getRotation();

requestBuilder.set(CaptureRequest.JPEG_ORIENTATION, ORIENTATIONS.get(rotation));

// cameraCaptureSession.capture(requestBuilder.build(), camera2Callback, null);

cameraCaptureSession.capture(requestBuilder.build(), mCaptureCallback, null);

} catch (CameraAccessException e) {

e.printStackTrace();

}

CameraCaptureSession.CaptureCallback mCaptureCallback

= new CameraCaptureSession.CaptureCallback() {

@Override

public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request,

TotalCaptureResult result) {

//showToast("JPEG Saved : ");

//Log.v("yo save","- saved JPEG -");

//unlockFocus();

}

};

private Handler mMessageHandler = new Handler() {

@Override

public void handleMessage(Message msg) {

if (this != null) {

Toast.makeText(CameraActivity.this, (String) msg.obj, Toast.LENGTH_SHORT).show();

}

};

private void showToast(String text) {

// We show a Toast by sending request message to mMessageHandler. This makes sure that the

// Toast is shown on the UI thread.

Message message = Message.obtain();

message.obj = text;

mMessageHandler.sendMessage(message);

}

//------------------------------------------------------------//

public View.OnClickListener onClickPicture = new View.OnClickListener() {

public void onClick(View v) {

/*------- camera2 --------------*/

mTimer = null;

mTimer = new Timer(true);

mTimer.schedule( new TimerTask(){

@Override

public void run() {

/*------------------------*/

mHandler.post( new Runnable() {

public void run() {

createCaptureRequest();

Log.v("yo click ","---- "+(count++)+" ---- click");

}

});

}

}, 1000, 2500);//1500,1600, 1800 etc

};

提前致谢.

编辑

我调查了CAMERA2 API的源程序,并发现了错误消息的出处.

JPEG_FRAME_TIMEOUT当前为300ms,我猜它太小了,想要增加它.如果有人知道该怎么做,请告诉我？

if (holder.hasJpegTargets()) {

doJpegCapture(holder);

if (!mReceivedJpeg.block(JPEG_FRAME_TIMEOUT)) {

Log.e(TAG, "Hit timeout for jpeg callback!");

mCaptureCollector.failNextJpeg();

}

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