android解決有些手機拍照圖片旋轉了角度的問題
遇到問題:有的手機拍攝的圖片自動旋轉90度,有的圖片旋轉了180度,有的手機是正常的,導致顯示到介面的上的頭像不準確。伺服器要求的是正的,這樣問題就來了,不能使用者發個照片在微博上看到的是被旋轉了的啊,另外一個專案裡旋轉了的圖片直接匹配出現問題,這個更嚴重。
解決思路:
1.拿到照相機自帶的返回的uri;
2.根據uri獲取到照片在手機上的絕對路徑,根據路徑獲取獲取照片的旋轉角度(此處應該特別注意:一定要是照相機返回的原始的uri,不然獲取到的旋轉角度始終為0);
3.根據uri獲取到bitmap
4.根據動態獲取到旋轉角度來旋轉圖片
5.把圖片設定到view上或傳到伺服器
直接上程式碼:
1.根據uri獲取到照片在手機上的絕對路徑,根據路徑獲取獲取照片的旋轉角度(此處應該特別注意:一定要是照相機返回的原始的uri,不然獲取到的旋轉角度始終為0);
/** * 專為Android4.4及以上設計的從Uri獲取檔案絕對路徑,以前的方法已不好使 */ @SuppressLint("NewApi") public static String getPath(final Context context, final Uri uri) { final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT; // DocumentProvider if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) { // ExternalStorageProvider if (isExternalStorageDocument(uri)) { final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; if ("primary".equalsIgnoreCase(type)) { return Environment.getExternalStorageDirectory() + "/" + split[1]; } // TODO handle non-primary volumes } // DownloadsProvider else if (isDownloadsDocument(uri)) { final String id = DocumentsContract.getDocumentId(uri); final Uri contentUri = ContentUris.withAppendedId( Uri.parse("content://downloads/public_downloads"), Long.valueOf(id)); return getDataColumn(context, contentUri, null, null); } // MediaProvider else if (isMediaDocument(uri)) { final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; Uri contentUri = null; if ("image".equals(type)) { contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; } else if ("video".equals(type)) { contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI; } else if ("audio".equals(type)) { contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; } final String selection = "_id=?"; final String[] selectionArgs = new String[]{split[1]}; return getDataColumn(context, contentUri, selection, selectionArgs); } } // MediaStore (and general) else if ("content".equalsIgnoreCase(uri.getScheme())) { return getDataColumn(context, uri, null, null); } // File else if ("file".equalsIgnoreCase(uri.getScheme())) { return uri.getPath(); } return null; } /** * Get the value of the data column for this Uri. This is useful for * MediaStore Uris, and other file-based ContentProviders. * * @param contextThe context. * @param uriThe Uri to query. * @param selection(Optional) Filter used in the query. * @param selectionArgs (Optional) Selection arguments used in the query. * @return The value of the _data column, which is typically a file path. */ public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) { Cursor cursor = null; final String column = "_data"; final String[] projection = {column}; try { cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null); if (cursor != null && cursor.moveToFirst()) { final int column_index = cursor.getColumnIndexOrThrow(column); return cursor.getString(column_index); } } finally { if (cursor != null) cursor.close(); } return null; } /** * @param uri The Uri to check. * @return Whether the Uri authority is ExternalStorageProvider. */ public static boolean isExternalStorageDocument(Uri uri) { return "com.android.externalstorage.documents".equals(uri.getAuthority()); } /** * @param uri The Uri to check. * @return Whether the Uri authority is DownloadsProvider. */ public static boolean isDownloadsDocument(Uri uri) { return "com.android.providers.downloads.documents".equals(uri.getAuthority()); } /** * @param uri The Uri to check. * @return Whether the Uri authority is MediaProvider. */ public static boolean isMediaDocument(Uri uri) { return "com.android.providers.media.documents".equals(uri.getAuthority()); }
2.根據圖片的絕對路徑獲取預設的角度:
/** * 讀取圖片的旋轉的角度 * * @param path 圖片絕對路徑 * @return 圖片的旋轉角度 */ public static int getBitmapDegree(String path) { int degree = 0; try { // 從指定路徑下讀取圖片,並獲取其EXIF資訊 ExifInterface exifInterface = new ExifInterface(path); // 獲取圖片的旋轉資訊 int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL); switch (orientation) { case ExifInterface.ORIENTATION_ROTATE_90: degree = 90; break; case ExifInterface.ORIENTATION_ROTATE_180: degree = 180; break; case ExifInterface.ORIENTATION_ROTATE_270: degree = 270; break; } } catch (IOException e) { e.printStackTrace(); } return degree; }
3.根據uri獲取到bitmap
public static Bitmap getBitmapFromUri(Context mContext, Uri uri) { try { // 讀取uri所在的圖片 Bitmap bitmap = MediaStore.Images.Media.getBitmap(mContext.getContentResolver(), uri); return bitmap; } catch (Exception e) { e.printStackTrace(); return null; } }
- 根據動態獲取到旋轉角度來旋轉圖片返回bitmap
/** * 旋轉圖片,使圖片保持正確的方向。 * * @param bitmap原始圖片 * @param degrees 原始圖片的角度 * @return Bitmap 旋轉後的圖片 */ public static Bitmap rotateBitmap(Bitmap bitmap, int degrees) { if (degrees == 0 || null == bitmap) { return bitmap; } Matrix matrix = new Matrix(); matrix.setRotate(degrees, bitmap.getWidth() / 2, bitmap.getHeight() / 2); Bitmap bmp = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); bitmap.recycle(); return bmp; }
專案中可以把以上的方法統一放到一個工具類中方便管理