Android 通过 URI 获取文件路径
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 onActivityResult(int requestCode, int resultCode, Intent data) 中获取到 URI 。
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%3A235700 ，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)) {// ExternalStorageProviderfinal 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)) {// DownloadsProviderfinal 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)) {// MediaProviderfinal 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/17766if (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%3A235700if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme()) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {if (DocumentsContract.isDocumentUri(context, uri)) {if (isExternalStorageDocument(uri)) {// ExternalStorageProviderfinal String docId = DocumentsContract.getDocumentId(uri);final String[] split = docId.split(":");final String type = split[0];if ("primary".equalsIgnoreCase(type)) {path = Environment.getExternalStorageDirectory() + "/" + split[1];
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