我正在尝试制作一个应用程序，它在一个单一的活动意图上先获取前图像，然后再获取后图像，我的前摄像头代码和下面的一样，工作得很好，我甚至调用finish来销毁曲面，在onsurfacedestroy（）中调用initbackcam（）方法，在下面给出的方法中再次工作，直到onsurfacechanged（）在onsurfacechanged（）中调用pcamera.takepicture（null，mpicturecallback，mpicturecallback）正在引发异常，takepicture失败
注意：这段代码在kitkat之前运行良好它在棒棒糖和棉花糖中失败了
我试着在前后摄像机之间延迟，我试着把后摄像机的代码放在不同的活动中，但它仍然抛出相同的错误，我已经释放了摄像机并在拍照前调用startpreview（），但它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)
最佳答案
试试这个
添加：
SurfaceTexture st = new SurfaceTexture(MODE_PRIVATE);
pCamera.setPreviewTexture(st);
以前：
pCamera.startPreview();
takePicture failed
希望这能帮到你