我正在尝试创建一个应用程序，它采用前面的图像然后返回图像上的单个活动意图，我的前置摄像头代码与下面相同，并且工作得很好我甚至调用完成来破坏表面和内部onSurfaceDestroy（）我调用下面给出的initBackCam（）方法再次正常工作直到OnSurfaceChanged（）里面的onSurfaceChanged（）我调用pCamera.takePicture（null，mPictureCallback，mPictureCallback）抛出异常takePicture失败
注意：此代码正常工作直到kitkat在棒棒糖和棉花糖中失败
我尝试在前后摄像头之间延迟，我试图将后置摄像头的代码放在不同的活动中仍然会抛出相同的错误，我已经发布了相机并在拍照之前调用了startPreview（）但仍然抛出相同的错误
我使用了以下权限
<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera" android:required="false" />
<uses-feature android:name="android.hardware.camera.front" android:required="false" />
<uses-feature android:name="android.hardware.camera.back" android:required="false" />
请帮助!!!!
public static Bitmap bitmap;
public SurfaceHolder pSurfaceHolder;
private Camera pCamera;
private boolean pPreviewRunning = false;
private RelativeLayout pCameraPreview;
private BackCameraService backCam;
private void initBackCamera() {
pCameraPreview = (RelativeLayout) findViewById(R.id.preview_back_camera);
backCam = new BackCameraService(getBaseContext(), pCamera);
pCameraPreview.addView(backCam);
}
public class BackCameraService extends SurfaceView implements SurfaceHolder.Callback {
public Camera pCamera;
private Context pContext;
Camera.PictureCallback mBackPictureCallback = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
pCamera = camera;
if (data != null) {
pCamera.stopPreview();
pPreviewRunning = false;
pCamera.release();
try {
BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inScaled = false;
bitmap = BitmapFactory.decodeByteArray(data, 0, data.length, opts);
Matrix matrix = new Matrix();
matrix.postRotate(-90);
File(Environment.getExternalStorageDirectory(), "MyImage");
if (!(root.isDirectory() && root.exists())) root.mkdirs();
File backImg = new File(root.getAbsolutePath(), "backImg");
if (!(backImg.isDirectory() && backImg.exists())) backImg.mkdirs();
File file = new File(backImg.getAbsolutePath(), "backImage.jpg");
try {
file.createNewFile();
FileOutputStream ostream = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 75, ostream);
ostream.close();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
setResult(585);
}
}
};
BackCameraService(Context context, Camera camera) {
super(context);
Log.d("jagteraho", "backCam started");
pContext = context;
pCamera = camera;
pSurfaceHolder = getHolder();
pSurfaceHolder.addCallback(BackCameraService.this);
pSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
surfaceCreated(pSurfaceHolder);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
Log.d("jagteraho", "backCam surface created");
pCamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);
surfaceChanged(holder, 2, 2, 2);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
Log.d("jagteraho", "backCam surface changed");
if (pPreviewRunning) {
pCamera.stopPreview();
}
Camera.Parameters p = pCamera.getParameters();
List<Camera.Size> previewSizes = p.getSupportedPreviewSizes();
Camera.Size previewSize = previewSizes.get(1);
p.setPreviewSize(previewSize.width, previewSize.height);
try {
pCamera.setParameters(p);
pCamera.setPreviewDisplay(holder);
} catch (Exception e) {
e.printStackTrace();
}
pCamera.startPreview();
pPreviewRunning = true;
pCamera.takePicture(null, mBackPictureCallback, mBackPictureCallback);
surfaceDestroyed(holder);
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
Log.d("jagteraho", "backCam surface destroyed");
}
}
日志如下：
02-15 19:18:11.159 6382-6382 surface created
02-15 19:18:11.161 206-892/? I/CameraService﹕ CameraService::connect call (PID 6382 , camera ID 1) for HAL version default and Camera API version 1
02-15 19:18:11.222 206-892/? I/Camera2ClientBase﹕ Camera 1: Opened. Client: (PID 6382, UID 10037)
02-15 19:18:11.485 6382-6382 surface changed
02-15 19:18:11.553 779-800/? I/ActivityManager﹕ Displayed +473ms
02-15 19:18:13.849 206-818/? I/Camera2ClientBase﹕ Closed Camera 1. Client was: (PID 6382, UID 10037)
02-15 19:18:14.102 6382-6382 ﹕ surface destroyed
02-15 19:18:14.103 6382-6382 ﹕ backCam started
02-15 19:18:14.103 6382-6382 ﹕ backCam surface created
02-15 19:18:14.103 206-1764/? I/CameraService﹕ CameraService::connect call (PID 6382 , camera ID 0) for HAL version default and Camera API version 1
02-15 19:18:14.165 206-1764/? I/Camera2ClientBase﹕ Camera 0: Opened. Client:(PID 6382, UID 10037)
02-15 19:18:14.238 6382-6382 ﹕ backCam surface changed
02-15 19:18:14.240 6382-6382 ﹕ app passed NULL surface
02-15 19:18:14.241 6382-6382 D/AndroidRuntime﹕ Shutting down VM
02-15 19:18:14.243 6382-6382 E/CustomActivityOnCrash﹕ App has crashed, executing CustomActivityOnCrash's UncaughtExceptionHandler
java.lang.RuntimeException: takePicture failed
at android.hardware.Camera.native_takePicture(Native Method)
at android.hardware.Camera.takePicture(Camera.java:1434)
at android.hardware.Camera.takePicture(Camera.java:1379)
at com.aspeage.jagteraho.AlarmActivity$BackCameraService.surfaceChanged(AlarmActivity.java:922)
at com.aspeage.jagteraho.AlarmActivity$BackCameraService.surfaceCreated(AlarmActivity.java:872)
at com.aspeage.jagteraho.AlarmActivity$BackCameraService.<init>(AlarmActivity.java:865)
at com.aspeage.jagteraho.AlarmActivity.initBackCamera(AlarmActivity.java:788)
at com.aspeage.jagteraho.AlarmActivity.access$400(AlarmActivity.java:77)
at com.aspeage.jagteraho.AlarmActivity$FrontCameraService.surfaceDestroyed(AlarmActivity.java:782)
at android.view.SurfaceView.updateWindow(SurfaceView.java:567)
at android.view.SurfaceView.onWindowVisibilityChanged(SurfaceView.java:239)
at android.view.View.dispatchWindowVisibilityChanged(View.java:9647)
at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1309)
at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1309)
at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1309)
at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1309)
at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1309)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1383)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
at android.view.Choreographer.doCallbacks(Choreographer.java:670)
at android.view.Choreographer.doFrame(Choreographer.java:606)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
答案 0 :(得分：6)
试试这个
添加：
SurfaceTexture st = new SurfaceTexture(MODE_PRIVATE);
pCamera.setPreviewTexture(st);
之前：
pCamera.startPreview();
希望这会帮助你