我正在捕捉图像并将其设置为图像视图。
public void captureImage() {
Intent intentCamera = new Intent("android.media.action.IMAGE_CAPTURE");
File filePhoto = new File(Environment.getExternalStorageDirectory(), "Pic.jpg");
imageUri = Uri.fromFile(filePhoto);
MyApplicationGlobal.imageUri = imageUri.getPath();
intentCamera.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intentCamera, TAKE_PICTURE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intentFromCamera) {
super.onActivityResult(requestCode, resultCode, intentFromCamera);
if (resultCode == RESULT_OK && requestCode == TAKE_PICTURE) {
if (intentFromCamera != null) {
Bundle extras = intentFromCamera.getExtras();
if (extras.containsKey("data")) {
bitmap = (Bitmap) extras.get("data");
}
else {
bitmap = getBitmapFromUri();
}
}
else {
bitmap = getBitmapFromUri();
}
// imageView.setImageBitmap(bitmap);
imageView.setImageURI(imageUri);
}
else {
}
}
public Bitmap getBitmapFromUri() {
getContentResolver().notifyChange(imageUri, null);
ContentResolver cr = getContentResolver();
Bitmap bitmap;
try {
bitmap = android.provider.MediaStore.Images.Media.getBitmap(cr, imageUri);
return bitmap;
}
catch (Exception e) {
e.printStackTrace();
return null;
}
}
但问题是，某些设备上的图像每次旋转时。例如，在三星设备上，它工作得很好，但在索尼Xperia上，图像旋转了90度，在东芝Thrive(平板电脑)上旋转了180度。
这里的解决方案基于上面的解决方案，但只需要上下文和图像文件作为输入
public static Bitmap rectifyImage(Context context,File imageFile){
Bitmap originalBitmap= BitmapFactory.decodeFile(imageFile.getAbsolutePath());
try{
Uri uri=Uri.fromFile(imageFile);
InputStream input = context.getContentResolver().openInputStream(uri);
ExifInterface ei;
if (Build.VERSION.SDK_INT > 23)
ei = new ExifInterface(input);
else
ei = new ExifInterface(uri.getPath());
int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
return rotateImage(originalBitmap, 90);
case ExifInterface.ORIENTATION_ROTATE_180:
return rotateImage(originalBitmap, 180);
case ExifInterface.ORIENTATION_ROTATE_270:
return rotateImage(originalBitmap, 270);
default:
return originalBitmap;
}
}catch (Exception e){
return originalBitmap;
}
}
public static Bitmap rotateImage(Bitmap source, float angle) {
Matrix matrix = new Matrix();
matrix.postRotate(angle);
return Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(),
matrix, true);
}
Jason Robinson和Sami Eltamawy的回答非常棒。
只是为了完成该方法的改进，您应该使用compat ExifInterface。
com.android.support: exifinterface: $ {lastLibVersion}
你将能够实例化ExifInterface(pior API <24)与InputStream(从ContentResolver)而不是uri路径避免“文件未找到异常”
https://android-developers.googleblog.com/2016/12/introducing-the-exifinterface-support-library.html
我根据@Jason Robinson的回答创建了一个Kotlin扩展函数，简化了Kotlin开发人员的操作。我希望这能有所帮助。
fun Bitmap.fixRotation(uri: Uri): Bitmap? {
val ei = ExifInterface(uri.path)
val orientation: Int = ei.getAttributeInt(
ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_UNDEFINED
)
return when (orientation) {
ExifInterface.ORIENTATION_ROTATE_90 -> rotateImage( 90f)
ExifInterface.ORIENTATION_ROTATE_180 -> rotateImage( 180f)
ExifInterface.ORIENTATION_ROTATE_270 -> rotateImage( 270f)
ExifInterface.ORIENTATION_NORMAL -> this
else -> this
}
}
fun Bitmap.rotateImage(angle: Float): Bitmap? {
val matrix = Matrix()
matrix.postRotate(angle)
return Bitmap.createBitmap(
this, 0, 0, width, height,
matrix, true
)
}
