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Android 保存图片到本地(兼容Android 10+) 图片保存在 DCIM 公开目录 大于 28 需使用 MediaStore 小于 29 直接 new FIle public class ImageSaveUtil { /** * 保存图片到公共目录 * 29 以下，需要提前申请文件读写权限 * 29及29以上的，不需要权限 * 保存的文件在 DCIM 目录下 * * @param context 上下文 * @param bitmap 需要保存的bitmap * @param format 图片格式 * @param quality 压缩的图片质量 * @param recycle 完成以后，是否回收Bitmap，建议为true * @return 文件的 uri */ @Nullable public static Uri saveAlbum(Context context, Bitmap bitmap, Bitmap.CompressFormat format, int quality, boolean recycle) { String suffix; if (Bitmap.CompressFormat.JPEG == format) suffix = "JPG"; else suffix = format.name(); String fileName = System.currentTimeMillis() + "_" + quality + "." + suffix; if (Build.VERSION.SDK_INT < 29) { if (!isGranted(context)) { Log.e("ImageUtils", "save to album need storage permission"); return null; } File picDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM); File destFile = new File(picDir, fileName); if (!save(bitmap, destFile, format, quality, recycle)) return null; Uri uri = null; if (destFile.exists()) { uri = Uri.parse("file://" + destFile.getAbsolutePath()); Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); intent.setData(uri); context.sendBroadcast(intent); } return uri; } else { // Android 10 使用 Uri contentUri; if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; } else contentUri = MediaStore.Images.Media.INTERNAL_CONTENT_URI; ContentValues contentValues = new ContentValues(); contentValues.put(MediaStore.Images.Media.DISPLAY_NAME, fileName); contentValues.put(MediaStore.Images.Media.MIME_TYPE, "image/*"); contentValues.put(MediaStore.Images.Media.RELATIVE_PATH, Environment.DIRECTORY_DCIM + "/"); // 告诉系统，文件还未准备好，暂时不对外暴露 contentValues.put(MediaStore.MediaColumns.IS_PENDING, 1); Uri uri = context.getContentResolver().insert(contentUri, contentValues); if (uri == null) return null; OutputStream os = null; try { os = context.getContentResolver().openOutputStream(uri); bitmap.compress(format, quality, os); // 告诉系统，文件准备好了，可以提供给外部了 contentValues.clear(); contentValues.put(MediaStore.MediaColumns.IS_PENDING, 0); context.getContentResolver().update(uri, contentValues, null, null); return uri; } catch (Exception e) { e.printStackTrace(); // 失败的时候，删除此 uri 记录 context.getContentResolver().delete(uri, null, null); return null; } finally { try { if (os != null) os.close(); } catch (IOException e) { // ignore } } } } private static boolean save(Bitmap bitmap, File file, Bitmap.CompressFormat format, int quality, boolean recycle) { if (isEmptyBitmap(bitmap)) { Log.e("ImageUtils", "bitmap is empty."); return false; } if (bitmap.isRecycled()) { Log.e("ImageUtils", "bitmap is recycled."); return false; } if (!createFile(file, true)) { Log.e("ImageUtils", "create or delete file <$file> failed."); return false; } OutputStream os = null; boolean ret = false; try { os = new BufferedOutputStream(new FileOutputStream(file)); ret = bitmap.compress(format, quality, os); if (recycle && !bitmap.isRecycled()) bitmap.recycle(); } catch (IOException e) { e.printStackTrace(); } finally { try { if (os != null) os.close(); } catch (IOException e) { // ignore } } return ret; } private static boolean isEmptyBitmap(Bitmap bitmap) { return bitmap == null || bitmap.isRecycled() || bitmap.getWidth() == 0 || bitmap.getHeight() == 0; } private static boolean createFile(File file, boolean isDeleteOldFile) { if (file == null) return false; if (file.exists()) { if (isDeleteOldFile) { if (!file.delete()) return false; } else return file.isFile(); } if (!createDir(file.getParentFile())) return false; try { return file.createNewFile(); } catch (IOException e) { return false; } } private static boolean createDir(File file) { if (file == null) return false; if (file.exists()) return file.isDirectory(); else return file.mkdirs(); } private static boolean isGranted(Context context) { return (Build.VERSION.SDK_INT < Build.VERSION_CODES.M || PackageManager.PERMISSION_GRANTED == ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE)); } } ———————————————— 版权声明：本文为CSDN博主「OneGreenHand」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。 原文链接：https://blog.csdn.net/a295268305/article/details/108880706 |
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