如何捕捉图像，并将其保存在SD卡

本文介绍了如何捕捉图像，并将其保存在SD卡的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

嘿，大家好我用下面的code，从我的应用程序访问的摄像头。 该应用程序能够访问摄像机我还增加了其onclicklistener增加了此行的code按钮： -

camera.takePicture（mShutterCallback，mPictureCallbackRaw，mPictureCallbackJpeg）;

现在我不知道会发生什么，但应用程序卡住我必须强制关闭它，然后我甚至不能访问本机摄像头的应用程序。 我认为它使应用程序不释放Camera对象。 加上形象永远不会被保存。

code： -

SurfaceHolder持有人; SurfaceView表面; 摄像头摄像头; 布尔值是previewRunning，fromOnResume; // preVIEW米preVIEW; / **第一次创建活动时调用。 * / @覆盖 公共无效的onCreate（包savedInstanceState）{     super.onCreate（savedInstanceState）;     的setContentView（R.layout.main）;     为previewRunning = FALSE;     fromOnResume = FALSE;    // requestWindowFeature（Window.FEATURE_NO_TITLE）;     表面=（SurfaceView）findViewById（R.id.surface）;     支架= surface.getHolder（）;   holder.addCallback（本）;   holder.setType（SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS）;   按钮BTN =（按钮）findViewById（R.id.click）;     btn.setOnClickListener（新OnClickListener（）{         @覆盖         公共无效的onClick（视图v）{             // TODO自动生成方法存根             camera.takePicture（mShutterCallback，mPictureCallbackRaw，mPictureCallbackJpeg）;             //的onCreate（空）;         }     }）; } @覆盖 公共无效surfaceChanged（SurfaceHolder持有人，INT格式，诠释的宽度，         INT高度）{ / *如果（是previewRunning）{           camera.stop preVIEW（）;          } * /     Camera.Parameters参数= camera.getParameters（）;     名单＆LT;大小＆GT;大小= parameters.getSupported previewSizes（）;     尺寸尺寸= sizes.get（0）;     parameters.set previewSize（size.width，size.height）;     camera.setParameters（参数）;      camera.start preVIEW（）;      为previewRunning = TRUE; } @覆盖 公共无效surfaceCreated（SurfaceHolder持有者）{     // TODO自动生成方法存根      相机= Camera.open（）;      尝试 {         camera.set previewDisplay（保持器）;     }赶上（IOException异常E）{         // TODO自动生成的catch块         e.printStackTrace（）;     } } @覆盖 公共无效surfaceDestroyed（SurfaceHolder持有者）{     // TODO自动生成方法存根     camera.stop preVIEW（）;     camera.release（）;     摄像头= NULL; }  Camera.PictureCallback mPictureCallbackRaw =新Camera.PictureCallback（）{  公共无效onPictureTaken（byte []的数据，摄像机C）{   Log.e（的getClass（）getSimpleName（），PICTURE回调RAW：+数据）;   camera.start preVIEW（）;  }  };  Camera.PictureCallback mPictureCallbackJpeg =新Camera.PictureCallback（）{  公共无效onPictureTaken（byte []的数据，摄像机C）{   Log.e（的getClass（）getSimpleName（），PICTURE CALLBACK JPEG：data.length =+数据）;   camera.start preVIEW（）;  }  };  Camera.ShutterCallback mShutterCallback =新Camera.ShutterCallback（）{  公共无效onShutter（）{  Log.e（的getClass（）getSimpleName（），快门回调。）;  }  }; / *  *保护无效onRestoreInstanceState（包savedInstanceState）  {  super.onRestoreInstanceState（savedInstanceState）;  }  保护无效onResume（）  {  Log.e（的getClass（）getSimpleName（），onResume。）;  camera.open（）;  fromOnResume = TRUE;  super.onResume（）;  }  保护无效的onSaveInstanceState（包outState）  {  super.onSaveInstanceState（outState）;  }  @覆盖 保护无效的onPause（）{     // TODO自动生成方法存根      camera.release（）;     super.onPause（）; }  保护无效的onStop（）  {  Log.e（的getClass（）getSimpleName（），的onStop。）;  super.onStop（）;  } * /

解决方案

我知道这是不完全的回答你的问题，但wouldn'nt它更容易使用股票摄像头应用程序？您可以使用此code。在您的活动访问：

@覆盖 公共无效的onCreate（包savedInstanceState） {     super.onCreate（savedInstanceState）;     的setContentView（R.layout.capture）;     按钮捕捉=（按钮）findViewById（R.id.capture_button）;     capture.setOnClickListener（新View.OnClickListener（）{         @覆盖         公共无效的onClick（视图v）{             //我们用股票相机应用程序来拍摄照片             意向意图=新的意图（MediaStore.ACTION_IM​​AGE_CAPTURE）;             intent.putExtra（MediaStore.EXTRA_OUTPUT，getImageUri（））;             startActivityForResult（意向，TAKE_PHOTO_ code）;         }     }）; } @覆盖 保护无效onActivityResult（INT申请code，INT结果code，意图数据）{     super.onActivityResult（要求code，因此code，数据）;     如果（要求code == TAKE_PHOTO_ code和;＆安培;结果code == RESULT_OK）{         开放的我们的ImagePath = getImageUri（）;         做一点事（）;     } } / **  *获取捕获的文件的URI  返回：一个Uri哪一条路径是一个映像文件的路径，存储在DCIM文件夹  * / 私人乌里getImageUri（）{     在DCIM //店面形象     档案文件=新的文件（Environment.getExternalStorageDirectory（）+/ DCIM，CAPTURE_TITLE）;     乌里imgUri = Uri.fromFile（文件）;     返回imgUri; }

hey guys i am using the following code to access camera from my application. The application is able to access the camera i have also added a button whose onclicklistener adds this line of code :-

camera.takePicture(mShutterCallback, mPictureCallbackRaw, mPictureCallbackJpeg);

Now i dont know what happens but the application gets stuck i have to force close it and then i can not even access the native camera application. I think it leaves the application without releasing the Camera object. Plus the image never gets saved.

Code :-

SurfaceHolder holder; SurfaceView surface; Camera camera; Boolean isPreviewRunning, fromOnResume; //Preview mpreview; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); isPreviewRunning = false; fromOnResume = false; // requestWindowFeature(Window.FEATURE_NO_TITLE); surface = (SurfaceView)findViewById(R.id.surface); holder = surface.getHolder(); holder.addCallback(this); holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); Button btn = (Button)findViewById(R.id.click); btn.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub camera.takePicture(mShutterCallback, mPictureCallbackRaw, mPictureCallbackJpeg); //onCreate(null); } }); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { /* if (isPreviewRunning) { camera.stopPreview(); } */ Camera.Parameters parameters = camera.getParameters(); List<Size> sizes = parameters.getSupportedPreviewSizes(); Size size = sizes.get(0); parameters.setPreviewSize(size.width, size.height); camera.setParameters(parameters); camera.startPreview(); isPreviewRunning=true; } @Override public void surfaceCreated(SurfaceHolder holder) { // TODO Auto-generated method stub camera = Camera.open(); try { camera.setPreviewDisplay(holder); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @Override public void surfaceDestroyed(SurfaceHolder holder) { // TODO Auto-generated method stub camera.stopPreview(); camera.release(); camera=null; } Camera.PictureCallback mPictureCallbackRaw = new Camera.PictureCallback() { public void onPictureTaken(byte[] data, Camera c) { Log.e(getClass().getSimpleName(), "PICTURE CALLBACK RAW: " + data); camera.startPreview(); } }; Camera.PictureCallback mPictureCallbackJpeg= new Camera.PictureCallback() { public void onPictureTaken(byte[] data, Camera c) { Log.e(getClass().getSimpleName(), "PICTURE CALLBACK JPEG: data.length = " + data); camera.startPreview(); } }; Camera.ShutterCallback mShutterCallback = new Camera.ShutterCallback() { public void onShutter() { Log.e(getClass().getSimpleName(), "SHUTTER CALLBACK"); } }; /* * protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); } protected void onResume() { Log.e(getClass().getSimpleName(), "onResume"); camera.open(); fromOnResume=true; super.onResume(); } protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); } @Override protected void onPause() { // TODO Auto-generated method stub camera.release(); super.onPause(); } protected void onStop() { Log.e(getClass().getSimpleName(), "onStop"); super.onStop(); }*/

解决方案

I know this isn't exactly an answer to your question, but wouldn'nt it be easier to use the stock camera application? You can access it using this code in your activity:

@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.capture); Button capture = (Button) findViewById(R.id.capture_button); capture.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // We use the stock camera app to take a photo Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); intent.putExtra(MediaStore.EXTRA_OUTPUT, getImageUri()); startActivityForResult(intent, TAKE_PHOTO_CODE); } }); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == TAKE_PHOTO_CODE && resultCode == RESULT_OK) { Uri imagePath = getImageUri(); doSomething(); } } /** * Get the uri of the captured file * @return A Uri which path is the path of an image file, stored on the dcim folder */ private Uri getImageUri() { // Store image in dcim File file = new File(Environment.getExternalStorageDirectory() + "/DCIM", CAPTURE_TITLE); Uri imgUri = Uri.fromFile(file); return imgUri; }