[英]Switch Camera crash Android
我有一個名為CameraHelper的類,當我嘗試通過單擊按鈕在一個平滑過渡中從前向后切換攝像機時,就可以使用。 當我調用此類時,我的應用程序凍結-我知道我做的不正確。 有人可以幫我從這里出去嗎?
任何幫助深表感謝。
public class CameraHelper {
private final CameraHelperImpl mImpl;
public CameraHelper(final Context context) {
if (SDK_INT >= GINGERBREAD) {
mImpl = new CameraHelperGB();
} else {
mImpl = new CameraHelperBase(context);
}
}
public interface CameraHelperImpl {
int getNumberOfCameras();
Camera openCamera(int id);
Camera openDefaultCamera();
Camera openCameraFacing(int facing);
boolean hasCamera(int cameraFacingFront);
void getCameraInfo(int cameraId, CameraInfo2 cameraInfo);
}
public int getNumberOfCameras() {
return mImpl.getNumberOfCameras();
}
public Camera openCamera(final int id) {
return mImpl.openCamera(id);
}
public Camera openDefaultCamera() {
return mImpl.openDefaultCamera();
}
public Camera openFrontCamera() {
return mImpl.openCameraFacing(CameraInfo.CAMERA_FACING_FRONT);
}
public Camera openBackCamera() {
return mImpl.openCameraFacing(CameraInfo.CAMERA_FACING_BACK);
}
public boolean hasFrontCamera() {
return mImpl.hasCamera(CameraInfo.CAMERA_FACING_FRONT);
}
public boolean hasBackCamera() {
return mImpl.hasCamera(CameraInfo.CAMERA_FACING_BACK);
}
public void getCameraInfo(final int cameraId, final CameraInfo2 cameraInfo) {
mImpl.getCameraInfo(cameraId, cameraInfo);
}
public void setCameraDisplayOrientation(final Activity activity,
final int cameraId, final Camera camera) {
int result = getCameraDisplayOrientation(activity, cameraId);
camera.setDisplayOrientation(result);
}
public int getCameraDisplayOrientation(final Activity activity, final int cameraId) {
int rotation = activity.getWindowManager().getDefaultDisplay()
.getRotation();
int degrees = 0;
switch (rotation) {
case Surface.ROTATION_0:
degrees = 0;
break;
case Surface.ROTATION_90:
degrees = 90;
break;
case Surface.ROTATION_180:
degrees = 180;
break;
case Surface.ROTATION_270:
degrees = 270;
break;
}
int result;
CameraInfo2 info = new CameraInfo2();
getCameraInfo(cameraId, info);
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
result = (info.orientation + degrees) % 360;
} else { // back-facing
result = (info.orientation - degrees + 360) % 360;
}
return result;
}
public static class CameraInfo2 {
public int facing;
public int orientation;
}
}
private void switchBackToFrontCamera(int frontCamId) {
if (camera != null) {
camera.stopPreview();
camera.release();
camera= null;
}
camera= Camera.open(frontCamId);
if (camera != null) {
try {
camera.setPreviewDisplay(mSurfaceView.getHolder());
camera.startPreview();
} catch (Exception e) {
e.printStackTrace();
}
}
}
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