Android 4.4前後版本讀取相簿圖片和拍照完美解決方案
阿新 • • 發佈：2019-02-14
4.3或以下,選了圖片之後,根據Uri來做處理,很多帖子都有了,我就不詳細說了.主要是4.4,如果使用上面pick的原生方法來選圖,返回的uri還是正常的,但如果用ACTION_GET_CONTENT的方法,返回的uri跟4.3是完全不一樣的,4.3返回的是帶檔案路徑的,而4.4返回的卻是content://com.android.providers.media.documents/document/image:3951這樣的,沒有路徑,只有圖片編號的uri.這就導致接下來無法根據圖片路徑來裁剪的步驟了.
來自overflow大牛的方法，4.4得到的uri,需要以下方法來獲取檔案的路徑：
/** * <br>功能簡述:4.4及以上獲取圖片的方法 * <br>功能詳細描述: * <br>注意: * @param context * @param uri * @return */ @TargetApi(Build.VERSION_CODES.KITKAT) 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]; } } // 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 the remote address if (isGooglePhotosUri(uri)) return uri.getLastPathSegment(); return getDataColumn(context, uri, null, null); } // File else if ("file".equalsIgnoreCase(uri.getScheme())) { return uri.getPath(); } return null; } 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 index = cursor.getColumnIndexOrThrow(column); return cursor.getString(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()); } /** * @param uri The Uri to check. * @return Whether the Uri authority is Google Photos. */ public static boolean isGooglePhotosUri(Uri uri) { return "com.google.android.apps.photos.content".equals(uri.getAuthority()); }</span></span>
為什麼會不一樣呢？
Android 4.4（含）開始，通過方式訪問相簿後，返回的Uri如下（訪問“最近”）：Uri is：content://com.android.providers.media.documents/document/image%3A18838
2 Uri.getPath is ：/document/image:18838
3 對應的圖片真實路徑：/storage/emulated/0/Pictures/Screenshots/Screenshot_2014-09-22-21-40-53.png</span>不但如此，對於不同型別相簿，返回的Uri形式並不相同（訪問普通相簿）：
Uri is：content://media/external/images/media/18822 2 Uri.getPath is ：/external/images/media/18822 3 對應的圖片真實路徑：/storage/emulated/0/Download/20130224235013.jpg</span>
而4.4之前返回的Uri只存在一種形式，如下：
Uri is：content://media/external/images/media/14046
2 Uri.getPath is ：/external/images/media/14046
3 對應的圖片真實路徑：/storage/emulated/0/DCIM/Camera/20130224235013.jpg因此，在Android 4.4或更高版本裝置上，通過簡單的getDataColumn(Context, Uri, null, null)進行圖片資料庫已經不能滿足所有需求，因此在獲取圖片真實路徑的時候需要根據不同型別區分對待。
版本判斷：
//版本比較：是否是4.4及以上版本 final boolean mIsKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
從相簿選擇照片方法比較：
/**
* <br>功能簡述:4.4及以上從相簿選擇照片
* <br>功能詳細描述:
* <br>注意:
*/
@TargetApi(Build.VERSION_CODES.KITKAT)
private void SelectImageUriAfterKikat() {
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/*");
startActivityForResult(intent, SELECET_A_PICTURE_AFTER_KIKAT);
}/**
* <br>功能簡述:4.4以下從相簿選照片並剪下
* <br>功能詳細描述:
* <br>注意:
*/
private void cropImageUri() {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT, null);
intent.setType("image/*");
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("outputX", 640);
intent.putExtra("outputY", 640);
intent.putExtra("scale", true);
intent.putExtra("return-data", false);
intent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(new File(IMGPATH, TMP_IMAGE_FILE_NAME)));
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
intent.putExtra("noFaceDetection", true); // no face detection
startActivityForResult(intent, SELECT_A_PICTURE);
}4.4及以上選取照片後需要呼叫剪下方法：
/**
* <br>功能簡述: 4.4及以上選取照片後剪下方法
* <br>功能詳細描述:
* <br>注意:
* @param uri
*/
private void cropImageUriAfterKikat(Uri uri) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("outputX", 640);
intent.putExtra("outputY", 640);
intent.putExtra("scale", true);
intent.putExtra("return-data", true); //返回資料bitmap
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
intent.putExtra("noFaceDetection", true); // no face detection
startActivityForResult(intent, SET_ALBUM_PICTURE_KITKAT);
}拍照通用方法，對返回資料做處理：
/**
* <br>功能簡述:對拍照的圖片剪下
* <br>功能詳細描述:
* <br>注意:
* @param uri
*/
private void cameraCropImageUri(Uri uri) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/jpeg");
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("outputX", 640);
intent.putExtra("outputY", 640);
intent.putExtra("scale", true);
if (mIsKitKat) {
intent.putExtra("return-data", true);
} else {
intent.putExtra("return-data", false);
intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
}
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
intent.putExtra("noFaceDetection", true);
startActivityForResult(intent, SET_PICTURE);
}顯示等處理如下：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == SELECT_A_PICTURE) {
if (resultCode == RESULT_OK && null != data) {
Log.i("zou", "4.4以下的");
Bitmap bitmap = decodeUriAsBitmap(Uri.fromFile(new File(IMGPATH,
TMP_IMAGE_FILE_NAME)));
mAcountHeadIcon.setImageBitmap(bitmap);
}
} else if (requestCode == SELECET_A_PICTURE_AFTER_KIKAT) {
if (resultCode == RESULT_OK && null != data) {
Log.i("zou", "4.4以上上的");
mAlbumPicturePath = getPath(MainActivity.this, data.getData());
cropImageUriAfterKikat(Uri.fromFile(new File(mAlbumPicturePath)));
}
} else if (requestCode == SET_ALBUM_PICTURE_KITKAT) {
Log.i("zou", "4.4以上上的 RESULT_OK");
Bitmap bitmap = data.getParcelableExtra("data");
mAcountHeadIcon.setImageBitmap(bitmap);
} else if (requestCode == TAKE_A_PICTURE) {
Log.i("zou", "resultCode:" + resultCode);
cameraCropImageUri(Uri.fromFile(new File(IMGPATH, IMAGE_FILE_NAME)));
} else if (requestCode == SET_PICTURE) {
Log.i("zou", "SET_PICTURE-resultCode:" + resultCode);
Bitmap bitmap = null;
if (mIsKitKat) {
if (null != data) {
bitmap = data.getParcelableExtra("data");
}
} else {
bitmap = decodeUriAsBitmap(Uri.fromFile(new File(IMGPATH, IMAGE_FILE_NAME)));
}
mAcountHeadIcon.setImageBitmap(bitmap);
}
}