我正在实现自定义相机。它工作正常，但在某些手机中，尤其是在少数三星手机中，我们面临一些问题，比如将图像保存为旋转。假设我们以纵向模式拍摄照片，但图像以横向模式保存。
这里我有一些疑问。
我尝试了很多。我的解决方案仅在 nexus、Moto G 等少数手机上运行。它在 Samsung S4 mini、Galaxy Grand Duos 2 中失败......
谢谢，
【问题讨论】：
我实现了一个拍照活动，您可以拍照并设置照片的方向。我测试的每台设备都支持它，包括三星 Galaxy 系列、平板电脑、索尼 xperia 系列、平板电脑。
您可以查看我接受的关于此主题的图像旋转的答案：
Camera capture orientation on samsung devices in android
这部分是我在主要活动中将拍摄的照片设置为图像视图的地方：
try {
File imageFile = new File(cursor.getString(0));
ExifInterface exif = new ExifInterface(
imageFile.getAbsolutePath());
int orientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_270:
rotate = 270;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
rotate = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_90:
rotate = 90;
break;
}
Log.v("", "Exif orientation: " + orientation);
} catch (Exception e) {
e.printStackTrace();
}
Matrix matrix = new Matrix();
matrix.postRotate(rotate);
bmp = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), matrix, true);
testImage.setImageBitmap(null);
testImage.setImageBitmap(bmp);
相机活动中的常量值：
private static final int ORIENTATION_PORTRAIT_NORMAL = 1;
private static final int ORIENTATION_PORTRAIT_INVERTED = 2;
private static final int ORIENTATION_LANDSCAPE_NORMAL = 3;
private static final int ORIENTATION_LANDSCAPE_INVERTED = 4;
private OrientationEventListener mOrientationEventListener;
private int mOrientation = -1;
相机活动中的回调函数：
Camera.PictureCallback photoCallback=new Camera.PictureCallback(){
public void onPictureTaken(final byte[] data, final Camera camera){
dialog=ProgressDialog.show(CameraActivity.this,"","Please wait while the photo is being saved..");
new Thread(){
public void run(){
try{
Thread.sleep(1000);
}
catch(Exception ex){}
onPictureTake(data,camera);
}
}.start();
}
};
相机活动中的拍照功能：
public void onPictureTake(byte[] data, Camera camera){
switch (mOrientation) {
case ORIENTATION_PORTRAIT_NORMAL:
rotate = 90;
break;
case ORIENTATION_LANDSCAPE_NORMAL:
rotate = 0;
break;
case ORIENTATION_PORTRAIT_INVERTED:
rotate = 270;
break;
case ORIENTATION_LANDSCAPE_INVERTED:
rotate = 180;
break;
}
Matrix matrix = new Matrix();
matrix.postRotate(rotate);
bmp = BitmapFactory.decodeByteArray(data, 0, data.length);
bmp = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), matrix, true);
mutableBitmap = bmp.copy(Bitmap.Config.ARGB_8888, true);
savePhoto(mutableBitmap);
dialog.dismiss();
flag = 0;
finish();
}
在相机活动的 onresume 中调用的方向监听器：
mOrientationEventListener = new OrientationEventListener(this, SensorManager.SENSOR_DELAY_NORMAL) {
@SuppressWarnings("deprecation")
@Override
public void onOrientationChanged(int orientation) {
// determine our orientation based on sensor response
int lastOrientation = mOrientation;
Display display = ((WindowManager)getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
int rotation = getWindowManager().getDefaultDisplay().getRotation();
System.out.println(rotation+"");
if (display.getOrientation() != Surface.ROTATION_0) { // landscape oriented devices
System.out.println("LANDSCAPE");
if (orientation >= 315 || orientation < 45) {
if (mOrientation != ORIENTATION_LANDSCAPE_NORMAL) {
mOrientation = ORIENTATION_LANDSCAPE_NORMAL;
}
} else if (orientation < 315 && orientation >= 225) {
if (mOrientation != ORIENTATION_PORTRAIT_INVERTED) {
mOrientation = ORIENTATION_PORTRAIT_INVERTED;
}
} else if (orientation < 225 && orientation >= 135) {
if (mOrientation != ORIENTATION_LANDSCAPE_INVERTED) {
mOrientation = ORIENTATION_LANDSCAPE_INVERTED;
}
} else if (orientation <135 && orientation > 45) {
if (mOrientation != ORIENTATION_PORTRAIT_NORMAL) {
mOrientation = ORIENTATION_PORTRAIT_NORMAL;
}
}
} else { // portrait oriented devices
System.out.println("PORTRAIT");
if (orientation >= 315 || orientation < 45) {
if (mOrientation != ORIENTATION_PORTRAIT_NORMAL) {
mOrientation = ORIENTATION_PORTRAIT_NORMAL;
}
} else if (orientation < 315 && orientation >= 225) {
if (mOrientation != ORIENTATION_LANDSCAPE_NORMAL) {
mOrientation = ORIENTATION_LANDSCAPE_NORMAL;
}
} else if (orientation < 225 && orientation >= 135) {
if (mOrientation != ORIENTATION_PORTRAIT_INVERTED) {
mOrientation = ORIENTATION_PORTRAIT_INVERTED;
}
} else if (orientation <135 && orientation > 45) {
if (mOrientation != ORIENTATION_LANDSCAPE_INVERTED) {
mOrientation = ORIENTATION_LANDSCAPE_INVERTED;
}
}
}
}
};
如果您还需要保存和使用已旋转的图像，请保存和使用我上面给出的答案以外的照片功能：
保存照片功能：
public void savePhoto(Bitmap bmp) {
imageFileFolder = new File(Environment.getExternalStorageDirectory(),
cc.getDirectoryName());
imageFileFolder.mkdir();
FileOutputStream out = null;
Calendar c = Calendar.getInstance();
String date = fromInt(c.get(Calendar.MONTH))
+ fromInt(c.get(Calendar.DAY_OF_MONTH))
+ fromInt(c.get(Calendar.YEAR))
+ fromInt(c.get(Calendar.HOUR_OF_DAY))
+ fromInt(c.get(Calendar.MINUTE))
+ fromInt(c.get(Calendar.SECOND));
imageFileName = new File(imageFileFolder, date.toString() + ".jpg");
try {
out = new FileOutputStream(imageFileName);
bmp.compress(Bitmap.CompressFormat.JPEG, 70, out);
out.flush();
out.close();
scanPhoto(imageFileName.toString());
out = null;
} catch (Exception e) {
e.printStackTrace();
}
}
scanPhoto功能：
public void scanPhoto(final String imageFileName) {
geniusPath = imageFileName;
msConn = new MediaScannerConnection(MyClass.this,
new MediaScannerConnectionClient() {
public void onMediaScannerConnected() {
msConn.scanFile(imageFileName, null);
}
@Override
public void onScanCompleted(String path, Uri uri) {
msConn.disconnect();
}
});
msConn.connect();
}
SavePhotoTask 类：
class SavePhotoTask extends AsyncTask<byte[], String, String> {
@Override
protected String doInBackground(byte[]... jpeg) {
File photo = new File(Environment.getExternalStorageDirectory(),
"photo.jpg");
if (photo.exists()) {
photo.delete();
}
try {
FileOutputStream fos = new FileOutputStream(photo.getPath());
fos.write(jpeg[0]);
fos.close();
} catch (java.io.IOException e) {
}
return (null);
}
}
【讨论】：