Android调用系统自带的文件管理器获取图片绝对路径

系统管理员 2022-10-12 15:54 186阅读 0赞

### 1、跳转到文件选择器进行文件选择 ###

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
    intent.addCategory(Intent.CATEGORY_OPENABLE);
    intent.setType("*/*");
    startActivityForResult(intent, REQUEST_CODE_SELECT_FILE);

### 2、在onActivityResult中对返回的数据进行处理 ###

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    
            super.onActivityResult(requestCode, resultCode, data);
            if (requestCode == REQUEST_CODE_SELECT_FILE && resultCode == RESULT_OK && data != null) {
                if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_DENIED) {
                    showAlertDialog("打开文件失败，请允许读写手机储存。",
                            new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {
                                    dialog.dismiss();
                                    ActivityCompat.requestPermissions(MainActivity.this,
                                            new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
                                }
                            });
                } else {
                    String imgPath = getImageAbsolutePath(this, data.getData());
                    Log.e("图片路径", "onActivityResult: " + imgPath);
                }
            }
    
    }
    
    
    /**
         * 提示对话框，带有“确定”按钮
         *
         * @param message  提示内容
         * @param listener “确定”按钮的点击监听器
         */
    private void showAlertDialog(String message, DialogInterface.OnClickListener listener) {
            AlertDialog dialog = new AlertDialog.Builder(this).setMessage(message)
                    .setPositiveButton("确定", listener).create();
            dialog.setCanceledOnTouchOutside(false);
            dialog.show();
    }

### 3、根据URI获取图片绝对路径 ###

/**
         * 根据Uri获取图片绝对路径.
         *
         * @param context  上下文
         * @param imageUri 图片的Uri
         * @return 图片绝对路径
         */
        public static String getImageAbsolutePath(Activity context, Uri imageUri) {
            if (context == null || imageUri == null)
                return null;
            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT && DocumentsContract.isDocumentUri(context, imageUri)) {
                if (isExternalStorageDocument(imageUri)) {
                    String docId = DocumentsContract.getDocumentId(imageUri);
                    String[] split = docId.split(":");
                    String type = split[0];
                    if ("primary".equalsIgnoreCase(type)) {
                        return Environment.getExternalStorageDirectory() + "/" + split[1];
                    }
                } else if (isDownloadsDocument(imageUri)) {
                    String id = DocumentsContract.getDocumentId(imageUri);
                    Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.parseLong(id));
                    return getDataColumn(context, contentUri, null, null);
                } else if (isMediaDocument(imageUri)) {
                    String docId = DocumentsContract.getDocumentId(imageUri);
                    String[] split = docId.split(":");
                    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;
                    }
                    String selection = MediaStore.Images.Media._ID + "=?";
                    String[] selectionArgs = new String[]{split[1]};
                    return getDataColumn(context, contentUri, selection, selectionArgs);
                }
            } // MediaStore (and general)
            else if ("content".equalsIgnoreCase(imageUri.getScheme())) {
                // Return the remote address
                if (isGooglePhotosUri(imageUri))
                    return imageUri.getLastPathSegment();
                return getDataColumn(context, imageUri, null, null);
            }
            // File
            else if ("file".equalsIgnoreCase(imageUri.getScheme())) {
                return imageUri.getPath();
            }
            return null;
        }
    
        /**
         * 从本地设备数据库查询数据.
         *
         * @param context       上下文
         * @param uri           内容提供者的标识
         * @param selection     设置条件，相当于SQL语句中的where
         * @param selectionArgs 条件值
         * @return 查询结果
         */
        public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
            Cursor cursor = null;
            String column = MediaStore.Images.Media.DATA;
            String[] projection = {column};  //告诉Provider要返回的内容（列Column）
            try {
                cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
                if (cursor != null && cursor.moveToFirst()) {
                    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());
        }

## 注意：给文件读写权限 ##

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />