Android 调用系统文件管理器

从今天开始做笔记

调用系统管理器时 使用QQ浏览器的文件管理时，找不到“_data”引起的崩溃。

java.lang.IllegalArgumentException: column '_data' does not exist. Available columns: []

1. 配好file_provider（略）

2.权限处理（略）

3.使用

调用

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*");//设置类型
intent.addCategory(Intent.CATEGORY_OPENABLE);
startActivityForResult(intent,0);

onActivityResult回调

if (resultCode == Activity.RESULT_OK) {
            Uri uri = data.getData();
            if ("file".equalsIgnoreCase(uri.getScheme())) {//使用第三方应用打开
                filePath = uri.getPath();
                return;
            }
            if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {//4.4以后
                filePath = FileUtil.getPath(this, uri);
                
            } else {//4.4以下下系统调用方法
                filePath = FileUtil.getRealPathFromURI(this, uri);
            }
        }

4.QQ浏览器文件管理 选择文件崩溃 问题的解决方法（FileUtil工具类中已包含）

if (isQQMediaDocument(uri)) {
        String path = uri.getPath();
        File fileDir = Environment.getExternalStorageDirectory();
        File file = new File(fileDir, path.substring("/QQBrowser".length(), path.length()));
        return file.exists() ? file.toString() : null;
}

 /**
     * 使用第三方qq文件管理器打开
     *
     * @param uri
     *
     * @return
     */
    public static boolean isQQMediaDocument(Uri uri) {
        return "com.tencent.mtt.fileprovider".equals(uri.getAuthority());
    }

5.FileUtil工具类

/**
 * Created by DB_BOY on 2019/6/24.</br>
 */
public class FileUtil {
    public static String readFileSize(String path) {
        return readableFileSize(new File(path).length());
    }
    
    public static String readableFileSize(long size) {
        if (size <= 0)
            return "0";
        final String[] units = new String[]{"B", "KB", "MB", "GB", "TB"};
        int digitGroups = (int) (Math.log10(size) / Math.log10(1024));
        return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups)) + " " + units[digitGroups];
    }

    
    /**
     * file --> uri
     * @param context
     * @param file
     *
     * @return
     */
    public static Uri getUriFromFile(Context context, File file) {
        if (context == null || file == null) {
            throw new NullPointerException();
        }
        Uri uri;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            uri = FileProvider.getUriForFile(context.getApplicationContext(), BuildConfig.APPLICATION_ID + ".fileprovider", file);
        } else {
            uri = Uri.fromFile(file);
        }
        return uri;
    }

    /**
     * 专为Android4.4设计的从Uri获取文件绝对路径，以前的方法已不好使
     */
    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    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
            //一些三方的文件浏览器会进入到这个方法中，例如ES
            //QQ文件管理器不在此列
            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];
                }
            }
            // 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);
            }
        } else if ("content".equalsIgnoreCase(uri.getScheme())) {// MediaStore (and general)
            // Return the remote address
            if (isGooglePhotosUri(uri))
                return uri.getLastPathSegment();


            if (isQQMediaDocument(uri)) {
                String path = uri.getPath();
                File fileDir = Environment.getExternalStorageDirectory();
                File file = new File(fileDir, path.substring("/QQBrowser".length(), path.length()));
                return file.exists() ? file.toString() : null;
            }

            return getDataColumn(context, uri, null, null);
        } else if ("file".equalsIgnoreCase(uri.getScheme())) {// File

            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 = MediaStore.MediaColumns.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;
    }


    public static String getRealPathFromURI(Context context, Uri contentUri) {
        return getDataColumn(context, contentUri, null, 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());
    }


    /**
     * 使用第三方qq文件管理器打开
     *
     * @param uri
     *
     * @return
     */
    public static boolean isQQMediaDocument(Uri uri) {
        return "com.tencent.mtt.fileprovider".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());
    }
}

工具类作者、文章原贴：DB_BOY - Android文件管理器选择文件，获得文件路径URI转File