博文出处: Android 通过 URI 获取文件路径 ,欢迎大家关注我的博客,谢谢!
之前在工作的过程中,遇到不同 Android 版本下 URI 采用不同方式来获取文件路径的问题。
因为需求的原因,要求拍照上传或者从相册中选择图片上传,而且图片是需要经过压缩的,大小不能超过 2M。
很快,拍照的这部分就搞定了。那么相册中选择图片的也是一样的道理,应该也是轻松解决了。
至于选择图片的代码,如下所示:
- intent = new Intent(Intent.ACTION_GET_CONTENT);
- intent.addCategory(Intent.CATEGORY_OPENABLE);
- intent.setType("image/*");
- startActivityForResult(intent, FILE_CHOOSER_RESULT_CODE);
之后就是在
中获取到 URI 。
- onActivityResult(int requestCode, int resultCode, Intent data)
最关键的来了,如果通过 URI 来获取文件呢?
比如,现在 URI 为 content://media/extenral/images/media/17766 ,而我们需要得到对应的文件路径。
- if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme())) {
- Cursor cursor = context.getContentResolver().query(uri, new String[]{MediaStore.Images.Media.DATA}, null, null, null);
- if (cursor != null) {
- if (cursor.moveToFirst()) {
- int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
- if (columnIndex > -1) {
- path = cursor.getString(columnIndex);
- }
- }
- cursor.close();
- }
- return path;
- }
原以为万事大吉,但是在 Android 4.4 及以上的手机上一试,发现根本不行。因为在 Android 4.4 及以上的手机上,获取到的 URI 变成了 content://com.android.providers.media.documents/document/image:235700 ,和之前我们预期的不是同一种类型。
这是因为在 Android 4.4 及以上的机型,使用了 DocumentUri 来代表获取到文件的 URI 。
所以我们又要对于 DocumentUri 进行适配。
- if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme())) {
- if (DocumentsContract.isDocumentUri(context, uri)) {
- if (isExternalStorageDocument(uri)) {
- // ExternalStorageProvider
- final String docId = DocumentsContract.getDocumentId(uri);
- final String[] split = docId.split(":");
- final String type = split[0];
- if ("primary".equalsIgnoreCase(type)) {
- path = Environment.getExternalStorageDirectory() + "/" + split[1];
- return path;
- }
- } else if (isDownloadsDocument(uri)) {
- // DownloadsProvider
- final String id = DocumentsContract.getDocumentId(uri);
- final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
- path = getDataColumn(context, contentUri, null, null);
- return path;
- } else if (isMediaDocument(uri)) {
- // MediaProvider
- 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]
- };
- path = getDataColumn(context, contentUri, selection, selectionArgs);
- return path;
- }
- }
- }
- private 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;
- }
- private static boolean isExternalStorageDocument(Uri uri) {
- return "com.android.externalstorage.documents".equals(uri.getAuthority());
- }
- private static boolean isDownloadsDocument(Uri uri) {
- return "com.android.providers.downloads.documents".equals(uri.getAuthority());
- }
- private static boolean isMediaDocument(Uri uri) {
- return "com.android.providers.media.documents".equals(uri.getAuthority());
- }
好了,上面的代码还是容易看懂的。这下就解决了对于 Android 4.4 及以上的机型适配。顺便把以 file:// 开头的 URI 适配也补上:
- if (ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
- path = uri.getPath();
- return path;
- }
完美了,下面就贴出完整的 FileUtils 代码,拿去用吧:
- public final class FileUtils {
- public static String getFilePathByUri(Context context, Uri uri) {
- String path = null;
- // 以 file:// 开头的
- if (ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
- path = uri.getPath();
- return path;
- }
- // 以 content:// 开头的,比如 content://media/extenral/images/media/17766
- if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme()) && Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
- Cursor cursor = context.getContentResolver().query(uri, new String[] {
- MediaStore.Images.Media.DATA
- },
- null, null, null);
- if (cursor != null) {
- if (cursor.moveToFirst()) {
- int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
- if (columnIndex > -1) {
- path = cursor.getString(columnIndex);
- }
- }
- cursor.close();
- }
- return path;
- }
- // 4.4及之后的 是以 content:// 开头的,比如 content://com.android.providers.media.documents/document/image:235700
- if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme()) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
- if (DocumentsContract.isDocumentUri(context, uri)) {
- if (isExternalStorageDocument(uri)) {
- // ExternalStorageProvider
- final String docId = DocumentsContract.getDocumentId(uri);
- final String[] split = docId.split(":");
- final String type = split[0];
- if ("primary".equalsIgnoreCase(type)) {
- path = Environment.getExternalStorageDirectory() + "/" + split[1];
- return path;
- }
- } else if (isDownloadsDocument(uri)) {
- // DownloadsProvider
- final String id = DocumentsContract.getDocumentId(uri);
- final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
- path = getDataColumn(context, contentUri, null, null);
- return path;
- } else if (isMediaDocument(uri)) {
- // MediaProvider
- 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]
- };
- path = getDataColumn(context, contentUri, selection, selectionArgs);
- return path;
- }
- }
- }
- return null;
- }
- private 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;
- }
- private static boolean isExternalStorageDocument(Uri uri) {
- return "com.android.externalstorage.documents".equals(uri.getAuthority());
- }
- private static boolean isDownloadsDocument(Uri uri) {
- return "com.android.providers.downloads.documents".equals(uri.getAuthority());
- }
- private static boolean isMediaDocument(Uri uri) {
- return "com.android.providers.media.documents".equals(uri.getAuthority());
- }
- }
讲完了,讲完了。
再见!
来源: http://www.jianshu.com/p/26dc5c0d174d