通过从MediaStore.ACTION_IMAGE_CAPTURE中选择图像来创建文件

我允许用户从他们的照片库中选择一张图片：

Intent pickIntent = new Intent(); pickIntent.setType("image/*"); pickIntent.setAction(Intent.ACTION_GET_CONTENT); Intent takePhotoIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); String pickTitle = "Select or take a new Picture"; // Or get from strings.xml Intent chooserIntent = Intent.createChooser(pickIntent, pickTitle); chooserIntent.putExtra ( Intent.EXTRA_INITIAL_INTENTS, new Intent[] { takePhotoIntent } ); startActivityForResult(chooserIntent, SELECT_PICTURE); 

在onActivityResult我想从所选图像中创建一个新File 。 这是我在做的事情：

 @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == 1 && resultCode == Activity.RESULT_OK) { if (data == null) { return; } Uri selectedImageUri = data.getData(); File mediaFile = new File(selectedImageUri.getPath()); if(!mediaFile.exists()) Log.d("File", "File doesn't exist"); } } 

我的检查mediaFile.exists()返回false。 我在这做错了什么？

更新

我也尝试过这样做：

 String fullPath = getRealPathFromURI(selectedImageUri); 

用这个方法从这里输入链接描述问题：

 public String getRealPathFromURI(Uri contentUri) { Cursor cursor = null; try { String[] proj = { MediaStore.Images.Media.DATA }; cursor = getContentResolver().query(contentUri, proj, null, null, null); int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst(); return cursor.getString(column_index); } catch (Exception e) { e.printStackTrace(); } finally { if (cursor != null) { cursor.close(); } } return null; } 

但是，此方法返回null。

Answer 1

将此类添加到项目中。

 public class RealPathUtil { @SuppressLint("NewApi") public static String getRealPathFromURI_API19(Context context, Uri uri){ String filePath = ""; String wholeID = DocumentsContract.getDocumentId(uri); // Split at colon, use second item in the array String id = wholeID.split(":")[1]; String[] column = { MediaStore.Images.Media.DATA }; // where id is equal to String sel = MediaStore.Images.Media._ID + "=?"; Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, column, sel, new String[]{ id }, null); int columnIndex = cursor.getColumnIndex(column[0]); if (cursor.moveToFirst()) { filePath = cursor.getString(columnIndex); } cursor.close(); return filePath; } @SuppressLint("NewApi") public static String getRealPathFromURI_API11to18(Context context, Uri contentUri) { String[] proj = { MediaStore.Images.Media.DATA }; String result = null; CursorLoader cursorLoader = new CursorLoader( context, contentUri, proj, null, null, null); Cursor cursor = cursorLoader.loadInBackground(); if(cursor != null){ int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst(); result = cursor.getString(column_index); } return result; } public static String getRealPathFromURI_BelowAPI11(Context context, Uri contentUri) { String[] proj = { MediaStore.Images.Media.DATA }; Cursor cursor = context.getContentResolver().query(contentUri, proj, null, null, null); int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst(); return cursor.getString(column_index); } } 

并使用android api的相对方法从uri获取图像路径。

编辑::检查手机的SDK版本

并获得路径使用

 int version = Build.VERSION.SDK_INT; String fullPath; if(version >= 19) { //call api 19 code here fullPath = getRealPathFromURI_API19(this, uri); } else if(version <= 18 && version >= 11) { // call api 11-18 code here fullPath = getRealPathFromURI_API11to18(this, uri); } else { // call below api 11 code here fullPath = getRealPathFromURI_BelowAPI11(this, uri); } File mediaFile = new File(fullPath); 

参考这个

Answer 2

它不需要特殊权限，可以使用存储访问框架，以及非官方的ContentProvider模式（ _data字段中的文件路径）。

 /** * Get a file path from a Uri. This will get the the path for Storage Access * Framework Documents, as well as the _data field for the MediaStore and * other file-based ContentProviders. * * @param context The context. * @param uri The Uri to query. * @author rahul */ 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 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; } /** * 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 = "_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()); } 

希望它能帮到你！