我正在尝试制作可以拍照的活动，唯一的问题是永远不会调用回调。预览会停止并显示“请稍候”对话框，因此一切正常，直到该部分。
我在安装了AOKP ROM的Galaxy S3 i9300上进行测试。 Android版本4.3.1
PictureTaker.java
package ...;
import everything;
public class PictureTaker extends Activity {
private Preview mPreview;
Camera mCamera;
int numberOfCameras;
int cameraCurrentlyLocked;
public AlertDialog diag;
protected PowerManager.WakeLock mWakeLock;
// The first rear facing camera
int defaultCameraId;
final Camera.ShutterCallback shutterCallback = new Camera.ShutterCallback() {
@Override
public void onShutter() {
Log.d("Adnan", "onShutter");
}
};
final Camera.PictureCallback mPicture = new Camera.PictureCallback() {
String picPath = Environment.getExternalStorageDirectory() + "/billsterData/camTemp.jpg";
@Override
public void onPictureTaken(byte[] data, Camera camera) {
String TAG = "Adnan";
diag.dismiss();
Log.d(TAG, "Attempting to store picture...");
final int MEDIA_TYPE_IMAGE = 100;
File pictureFile = new File(picPath);
if (pictureFile == null){
Log.d(TAG, "Error creating media file, check storage permissions");
return;
}
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
} catch (FileNotFoundException e) {
Log.d(TAG, "File not found: " + e.getMessage());
} catch (IOException e) {
Log.d(TAG, "Error accessing file: " + e.getMessage());
}
}
};
public void onExitPressed(View v) {
onBackPressed();
}
public void takePic(View v) {
Log.i("Adnan", "taking picture...");
mCamera.takePicture(shutterCallback, null, mPicture);
v.startAnimation(AnimationUtils.loadAnimation(this, R.anim.popup));
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Please wait");
builder.setView(getLayoutInflater().inflate(R.layout.progress_circular, null));
builder.setCancelable(false);
diag = builder.create();
diag.show();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Hide the window title.
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.pic_taker_carry);
// Create a RelativeLayout container that will hold a SurfaceView,
// and set it as the content of our activity.
mPreview = new Preview(this);
RelativeLayout carry = (RelativeLayout)findViewById(R.id.container);
mPreview.setLayoutParams(new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
carry.addView(mPreview,0);
//setContentView(mPreview);
// Find the total number of cameras available
numberOfCameras = Camera.getNumberOfCameras();
// Find the ID of the default camera
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
for (int i = 0; i < numberOfCameras; i++) {
Camera.getCameraInfo(i, cameraInfo);
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
defaultCameraId = i;
}
}
}
@Override
protected void onResume() {
super.onResume();
final PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
this.mWakeLock = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "My Tag");
this.mWakeLock.acquire();
// Open the default i.e. the first rear facing camera.
mCamera = Camera.open();
cameraCurrentlyLocked = defaultCameraId;
mPreview.setCamera(mCamera);
}
@Override
protected void onPause() {
super.onPause();
this.mWakeLock.release();
// Because the Camera object is a shared resource, it's very
// important to release it when the activity is paused.
if (mCamera != null) {
mPreview.setCamera(null);
mCamera.release();
mCamera = null;
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
return true;
}
}
Preview.java
package ...;
import everything
public class Preview extends ViewGroup implements SurfaceHolder.Callback {
private final String TAG = "Preview";
SurfaceView mSurfaceView;
SurfaceHolder mHolder;
Size mPreviewSize;
List<Size> mSupportedPreviewSizes;
Camera mCamera;
public Preview(Context context) {
super(context);
mSurfaceView = new SurfaceView(context);
addView(mSurfaceView);
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = mSurfaceView.getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void setCamera(Camera camera) {
mCamera = camera;
if (mCamera != null) {
mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
requestLayout();
}
}
public void switchCamera(Camera camera) {
setCamera(camera);
try {
camera.setPreviewDisplay(mHolder);
} catch (IOException exception) {
Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
}
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
requestLayout();
camera.setParameters(parameters);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// We purposely disregard child measurements because act as a
// wrapper to a SurfaceView that centers the camera preview instead
// of stretching it.
final int width = resolveSize(getSuggestedMinimumWidth(), widthMeasureSpec);
final int height = resolveSize(getSuggestedMinimumHeight(), heightMeasureSpec);
setMeasuredDimension(width, height);
if (mSupportedPreviewSizes != null) {
mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes, width, height);
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
if (changed && getChildCount() > 0) {
final View child = getChildAt(0);
final int width = r - l;
final int height = b - t;
int previewWidth = width;
int previewHeight = height;
if (mPreviewSize != null) {
previewWidth = mPreviewSize.width;
previewHeight = mPreviewSize.height;
}
// Center the child SurfaceView within the parent.
if (width * previewHeight > height * previewWidth) {
final int scaledChildWidth = previewWidth * height / previewHeight;
child.layout((width - scaledChildWidth) / 2, 0,
(width + scaledChildWidth) / 2, height);
} else {
final int scaledChildHeight = previewHeight * width / previewWidth;
child.layout(0, (height - scaledChildHeight) / 2,
width, (height + scaledChildHeight) / 2);
}
}
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, acquire the camera and tell it where
// to draw.
try {
if (mCamera != null) {
mCamera.setPreviewDisplay(holder);
}
} catch (IOException exception) {
Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// Surface will be destroyed when we return, so stop the preview.
if (mCamera != null) {
mCamera.stopPreview();
}
}
private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
final double ASPECT_TOLERANCE = 0.1;
double targetRatio = (double) w / h;
if (sizes == null) return null;
Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
// Try to find an size match aspect ratio and size
for (Size size : sizes) {
double ratio = (double) size.width / size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
// Cannot find the one match the aspect ratio, ignore the requirement
if (optimalSize == null) {
minDiff = Double.MAX_VALUE;
for (Size size : sizes) {
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
}
return optimalSize;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// Now that the size is known, set up the camera parameters and begin
// the preview.
try {
mCamera.stopPreview();
} catch (Exception e ) {
}
Camera.Parameters parameters = mCamera.getParameters();
parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
parameters.setPictureFormat(PixelFormat.JPEG);
parameters.setJpegQuality(80);
requestLayout();
mCamera.setParameters(parameters);
mCamera.startPreview();
}
}
logcat中的一些相关行：
01-20 17:13:56.544 22594-5071/? E/exynos_param﹕ exynos_param_string_get: Unable to get data for key recording-hint
01-20 17:13:56.544 22594-5071/? E/exynos_param﹕ exynos_param_string_get: Unable to get data for key focus-areas
01-20 17:13:56.574 22594-5973/? E/exynos_camera﹕ exynos_camera_capture_thread: Starting thread
01-20 17:13:56.729 22594-22631/? E/exynos_camera﹕ Preview thread was already stopped!
01-20 17:13:56.739 22594-25719/? E/exynos_param﹕ exynos_param_data_set: Mismatching types for key horizontal-view-angle
01-20 17:13:56.744 22594-25719/? E/exynos_param﹕ exynos_param_string_get: Unable to get data for key recording-hint
01-20 17:13:56.744 22594-25719/? E/exynos_param﹕ exynos_param_string_get: Unable to get data for key focus-areas
01-20 17:13:56.744 22594-5974/? E/exynos_camera﹕ exynos_camera_preview_thread: Starting thread
01-20 17:13:58.709 22594-5975/? E/exynos_camera﹕ exynos_camera_picture_thread: Starting thread
01-20 17:13:58.804 22594-5973/? E/exynos_camera﹕ s5c73m3_interleaved_decode: Invalid jpeg start
01-20 17:13:58.804 22594-5973/? E/exynos_camera﹕ exynos_camera_capture: Unable to decode S5C73M3 interleaved
01-20 17:13:58.804 22594-5973/? E/exynos_camera﹕ exynos_camera_capture_thread: Unable to capture
01-20 17:14:15.479 22594-5974/? E/exynos_camera﹕ exynos_camera_preview_thread: Exiting thread
01-20 17:14:15.534 22594-5975/? E/exynos_camera﹕ exynos_camera_picture_thread: Exiting thread
01-20 17:14:15.534 22594-5973/? E/exynos_camera﹕ exynos_camera_capture_thread: Exiting thread
注意这一个：
01-20 17:13:58.804 22594-5973/? E/exynos_camera﹕ s5c73m3_interleaved_decode: Invalid jpeg start
答案 0 :(得分：3)
我在使用CyanogenMod 10.1及以上版本的Galaxy S3（I9300）上遇到了同样的问题。今天我找到了解决方案。我认为这是AOPK代码中的一个问题。
您必须确保预览和图片的宽高比相等。
尝试使用此代码获取没有此问题的图片大小：
private Camera.Size getBestPictureSize(List<Camera.Size> pictureSizes, int maxWidth, Size previewSize) {
Comparator<Camera.Size> cmp = new Comparator<Camera.Size>() {
public int compare(Camera.Size size_1, Camera.Size size_2) {
return Integer.valueOf(size_1.width).compareTo(Integer.valueOf(size_2.width));
}
};
final double ASPECT_TOLERANCE = 0.1;
double targetAspect = (double)previewSize.width / (double)previewSize.height;
ArrayList<Camera.Size> matchedPictureSizes = new ArrayList<Camera.Size>();
for(Size pictureSize : pictureSizes) {
double pictureAspect = (double)pictureSize.width / (double)pictureSize.height;
if(pictureSize.width <= maxWidth && Math.abs(targetAspect - pictureAspect) < ASPECT_TOLERANCE) {
matchedPictureSizes.add(pictureSize);
}
}
Camera.Size bestPictureSize;
if(!matchedPictureSizes.isEmpty()) {
bestPictureSize = Collections.max(matchedPictureSizes, cmp);
} else {
bestPictureSize = Collections.max(pictureSizes, cmp);
}
return bestPictureSize;
}
我希望这段代码可以解决您的问题。