Android 4.4前后版本读取图库图片方式的变化
本文讲述Android 4.4（KitKat）前后访问图库以及访问后通过图片路径读取图片的变化
Android 4.4（KitKat）以前：
访问图库（方法一）：
* Access the gallery to pick up an image.
startPickPhotoActivity() {
Intent intent =
Intent(Intent. ACTION_GET_CONTENT );
intent.setType( "image/*" ); // Or 'image/ jpeg '
startActivityForResult(intent,
RESULT_PICK_PHOTO_NORMAL );
访问图库（方法二）：
* Access the gallery to pick up an image.
startPickPhotoActivity() {
Intent intent =
Intent(Intent. ACTION_GET_CONTENT );
intent.setType( "image/*" ); // Or 'image/ jpeg '
Intent wrapperIntent = Intent. createChooser (intent,
startActivityForResult(wrapperIntent,
RESULT_PICK_PHOTO_NORMAL );
获取文件路径&读取图片：
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == RESULT_PICK_PHOTO_NORMAL) {
if (resultCode == RESULT_OK && data != null) {
mFileName = DemoUtils.getDataColumn(getApplicationContext(),
data.getData(), null, null);
mColorBitmap = DemoUtils.getBitmap(mFileName);
mImage.setImageBitmap(mColorBitmap);
public static final Bitmap getBitmap(String fileName) {
Bitmap bitmap = null;
Options options = new Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(fileName, options);
options.inSampleSize = Math.max(1, (int) Math.ceil(Math.max(
(double) options.outWidth / 1024f,
(double) options.outHeight / 1024f)));
options.inJustDecodeBounds = false;
bitmap = BitmapFactory.decodeFile(fileName, options);
} catch (OutOfMemoryError error) {
error.printStackTrace();
* Get the value of the data column for this Uri . This is useful for
* MediaStore Uris , and other file - based ContentProviders.
* @param context
The context.
* @param uri
The 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 = MediaColumns.DATA;
final String[] projection = { column };
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;
Android 4.4（KitKat）及以后：
访问图库（方法一）：同上方法一
访问图库（方法二）：同上方法二
访问图库（方法三）：
* Access the gallery to pick up an image.
@TargetApi (Build.VERSION_CODES. KITKAT )
startPickPhotoActivity() {
Intent intent =
Intent(Intent. ACTION_OPEN_DOCUMENT );
intent.setType( "image/*" ); // Or 'image/ jpeg '
startActivityForResult(intent,
RESULT_PICK_PHOTO_NORMAL );
获取文件路径&读取图片：
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == RESULT_PICK_PHOTO_KITKAT) {
if (resultCode == RESULT_OK && data != null) {
mFileName = DemoUtils.getPath(getApplicationContext(),
data.getData());
mColorBitmap = DemoUtils.getBitmap(mFileName);
mImage.setImageBitmap(mColorBitmap);
@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];
// 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 = MediaColumns._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);
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 context
The context.
* @param uri
The 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 = MediaColumns.DATA;
final String[] projection = { column };
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());
为什么会不一样呢？
Android 4.4（含）开始，通过方式访问图库后，返回的Uri如下（访问&最近&）：
1 Uri is：
content://com.android.providers.media.documents/document/image%3A18838
2 Uri.getPath is ：/document/image:18838
3 对应的图片真实路径：/storage/emulated/0/Pictures/Screenshots/Screenshot_-21-40-53.png
不但如此，对于不同类型图库，返回的Uri形式并不相同（访问普通相册）：
1 Uri is：
content://media/external/images/media/18822
2 Uri.getPath is ：/external/images/media/18822
3 对应的图片真实路径：/storage/emulated/0/Download/13.jpg
而4.4之前返回的Uri只存在一种形式，如下：
1 Uri is：
content://media/external/images/media/14046
2 Uri.getPath is ：/external/images/media/14046
3 对应的图片真实路径：/storage/emulated/0/DCIM/Camera/13.jpg
因此，在Android 4.4或更高版本设备上，通过简单的getDataColumn(Context, Uri, null, null)进行图片数据库已经不能满足所有需求，因此在获取图片真实路径的时候需要根据不同类型区分对待。
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