當(dāng)我將媒體庫(kù)中的圖像加載到位圖中時(shí)，一切正常，除了將相機(jī)在垂直握住手機(jī)的情況下拍攝的照片旋轉(zhuǎn)之外，即使在垂直方向上看起來(lái)是垂直的，我也總是得到水平的照片。畫(huà)廊。為什么會(huì)這樣，如何正確加載呢？
3 回答
喵喵時(shí)光機(jī)
TA貢獻(xiàn)1846條經(jīng)驗(yàn) 獲得超7個(gè)贊
這是一個(gè)完整的解決方案（可從Facebook SDK的Hackbook示例中找到）。它的優(yōu)點(diǎn)是不需要訪問(wèn)文件本身。如果要從內(nèi)容解析器加載圖像，這將非常有用（例如，如果您的應(yīng)用正在響應(yīng)共享照片的意圖）。
public static int getOrientation(Context context, Uri photoUri) {
/* it's on the external media. */
Cursor cursor = context.getContentResolver().query(photoUri,
new String[] { MediaStore.Images.ImageColumns.ORIENTATION }, null, null, null);
if (cursor.getCount() != 1) {
return -1;
}
cursor.moveToFirst();
return cursor.getInt(0);
}
然后，您可以如下獲得旋轉(zhuǎn)的位圖。這段代碼還將圖片縮小（不幸的是）到MAX_IMAGE_DIMENSION。否則可能會(huì)耗盡內(nèi)存。
public static Bitmap getCorrectlyOrientedImage(Context context, Uri photoUri) throws IOException {
InputStream is = context.getContentResolver().openInputStream(photoUri);
BitmapFactory.Options dbo = new BitmapFactory.Options();
dbo.inJustDecodeBounds = true;
BitmapFactory.decodeStream(is, null, dbo);
is.close();
int rotatedWidth, rotatedHeight;
int orientation = getOrientation(context, photoUri);
if (orientation == 90 || orientation == 270) {
rotatedWidth = dbo.outHeight;
rotatedHeight = dbo.outWidth;
} else {
rotatedWidth = dbo.outWidth;
rotatedHeight = dbo.outHeight;
}
Bitmap srcBitmap;
is = context.getContentResolver().openInputStream(photoUri);
if (rotatedWidth > MAX_IMAGE_DIMENSION || rotatedHeight > MAX_IMAGE_DIMENSION) {
float widthRatio = ((float) rotatedWidth) / ((float) MAX_IMAGE_DIMENSION);
float heightRatio = ((float) rotatedHeight) / ((float) MAX_IMAGE_DIMENSION);
float maxRatio = Math.max(widthRatio, heightRatio);
// Create the bitmap from file
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = (int) maxRatio;
srcBitmap = BitmapFactory.decodeStream(is, null, options);
} else {
srcBitmap = BitmapFactory.decodeStream(is);
}
is.close();
/*
* if the orientation is not 0 (or -1, which means we don't know), we
* have to do a rotation.
*/
if (orientation > 0) {
Matrix matrix = new Matrix();
matrix.postRotate(orientation);
srcBitmap = Bitmap.createBitmap(srcBitmap, 0, 0, srcBitmap.getWidth(),
srcBitmap.getHeight(), matrix, true);
}
return srcBitmap;
}
郎朗坤
TA貢獻(xiàn)1921條經(jīng)驗(yàn) 獲得超9個(gè)贊
在這篇文章中，借助這篇文章幫助解決了我的問(wèn)題：
Bitmap myBitmap = getBitmap(imgFile.getAbsolutePath());
try {
ExifInterface exif = new ExifInterface(imgFile.getAbsolutePath());
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
Log.d("EXIF", "Exif: " + orientation);
Matrix matrix = new Matrix();
if (orientation == 6) {
matrix.postRotate(90);
}
else if (orientation == 3) {
matrix.postRotate(180);
}
else if (orientation == 8) {
matrix.postRotate(270);
}
myBitmap = Bitmap.createBitmap(myBitmap, 0, 0, myBitmap.getWidth(), myBitmap.getHeight(), matrix, true); // rotating bitmap
}
catch (Exception e) {
}
ImageView img = (ImageView) findViewById(R.id.imgTakingPic);
img.setImageBitmap(myBitmap);
希望它可以節(jié)省別人的時(shí)間！
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