我为此做了很多工作，并想，我会分享我的解决方案。它在摩托罗拉 Devy、三星 Xcover 1 和三星 XCover 2 上进行了测试。
当我使用自定义相机预览时，该解决方案基本上有两个部分。1.照顾相机预览并根据设备旋转设置预览的旋转。2. 拍照后，调用'onPictureTaken' 回调，将图片旋转正确的角度，以显示预览刚刚显示的内容。
1
private void initPreview(int width, int height) {
if (camera != null && holder.getSurface() != null) {
try {
camera.setPreviewDisplay(holder);
} catch (Throwable t) {
Log.e("PreviewDemo-surfaceCallback",
"Exception in setPreviewDisplay()", t);
Toast.makeText(getContext(), t.getMessage(),
Toast.LENGTH_LONG).show();
}
try {
Camera.Parameters parameters=camera.getParameters();
Camera.Size size=getBestPreviewSize(width, height, parameters);
Camera.Size pictureSize=getSmallestPictureSize(parameters);
Display display = windowManager.getDefaultDisplay();
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.FROYO) { // for 2.1 and before
if (isPortrait(display)) {
parameters.set(CAMERA_PARAM_ORIENTATION, CAMERA_PARAM_PORTRAIT);
} else {
parameters.set(CAMERA_PARAM_ORIENTATION, CAMERA_PARAM_LANDSCAPE);
}
} else { // for 2.2 and later
switch (display.getRotation()) {
case Surface.ROTATION_0: // This is display orientation
if (size.height > size.width) parameters.setPreviewSize(size.height, size.width);
else parameters.setPreviewSize(size.width, size.height);
camera.setDisplayOrientation(90);
break;
case Surface.ROTATION_90:
if (size.height > size.width) parameters.setPreviewSize(size.height, size.width);
else parameters.setPreviewSize(size.width, size.height);
camera.setDisplayOrientation(0);
break;
case Surface.ROTATION_180:
if (size.height > size.width) parameters.setPreviewSize(size.height, size.width);
else parameters.setPreviewSize(size.width, size.height);
camera.setDisplayOrientation(270);
break;
case Surface.ROTATION_270:
if (size.height > size.width) parameters.setPreviewSize(size.height, size.width);
else parameters.setPreviewSize(size.width, size.height);
camera.setDisplayOrientation(180);
break;
}
}
parameters.setPictureSize(pictureSize.width, pictureSize.height);
//parameters.setPictureFormat(ImageFormat.JPEG);
camera.setParameters(parameters);
} catch (Exception e) {
e.printStackTrace();
}
}
}
您的“surfaceChanged”方法，在您的相机预览（SurfaceView）中，您应该如下所示：
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
stopPreview();
initPreview(w, h);
startPreview();
}
在哪里
停止预览：
private void stopPreview() {
if (camera != null) {
camera.stopPreview();
}
}
开始预览：
private void startPreview() {
if (camera != null) {
camera.startPreview();
}
}
2
在您的“onPictureTaken”回调中，使用以下代码旋转图片：
Display display = getWindowManager().getDefaultDisplay();
int rotation = 0;
switch (display.getRotation()) {
case Surface.ROTATION_0: // This is display orientation
rotation = 90;
break;
case Surface.ROTATION_90:
rotation = 0;
break;
case Surface.ROTATION_180:
rotation = 270;
break;
case Surface.ROTATION_270:
rotation = 180;
break;
}
Bitmap bitmap = BitmapTools.toBitmap(data);
bitmap = BitmapTools.rotate(bitmap, rotation);
位图工具.java
public class BitmapTools {
public static Bitmap toBitmap(byte[] data) {
return BitmapFactory.decodeByteArray(data , 0, data.length);
}
public static Bitmap rotate(Bitmap in, int angle) {
Matrix mat = new Matrix();
mat.postRotate(angle);
return Bitmap.createBitmap(in, 0, 0, in.getWidth(), in.getHeight(), mat, true);
}
}