Android 打开系统文件管理器，并返回选中文件的路径

职场小白迷上优美句子: 

推迟，拖延真的是件可怕的事，过去了好久还是原来的样子。

公司现在的项目中有一个需求，需要把本地 json 格式的数据导入到项目中使用，其实简单的逻辑就是：使用安卓隐式跳转的方式进入到文件管理器，然后寻找需要的文件，点击文件之后返回该文件的路径，之后根据路径获取到该文件并对其进行相应的操作。

这些代码不是自己在Android 官网上找的，也是从百度搜的，当然需要标明出处：

Android调用系统自带的文件管理器，打开指定路径_android file 内置文件到机器特定路径_沧海龙腾LV的博客-CSDN博客

1.进入文件管理器

private void intoFileManager() {
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.setType("*/*");//无类型限制
//        有类型限制是这样的:
//        intent.setType(“image/*”);//选择图片
//        intent.setType(“audio/*”); //选择音频
//        intent.setType(“video/*”); //选择视频 （mp4 3gp 是android支持的视频格式）
//        intent.setType(“video/*;image/*”);//同时选择视频和图片
 
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        startActivityForResult(intent, 1);
    }

2.返回结果

String path;
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
 
        if (resultCode == Activity.RESULT_OK) {
            Uri uri = data.getData();
            if ("file".equalsIgnoreCase(uri.getScheme())){//使用第三方应用打开
                path = uri.getPath();
                mFilePathTv.setText(path);
                Log.d("queryfilepath", "返回结果1: " + path);
                return;
            }
            if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {//4.4以后
                path = FileChooseUtil.getPath(this, uri);
                mFilePathTv.setText(path);
                Log.d("queryfilepath", "返回结果2: " + path);
 
            } else {//4.4以下下系统调用方法
                path = FileChooseUtil.getRealPathFromURI(uri);
                mFilePathTv.setText(path);
                Log.d("queryfilepath", "返回结果3: " + path);
 
            }
        }
 
    }

3.用到的工具类

public class FileChooseUtil {
 
    private static Context context;
    private static FileChooseUtil util = null;
 
    private FileChooseUtil(Context context) {
        this.context = context;
    }
 
    public static FileChooseUtil getInstance(Context context) {
        if (util == null) {
            util = new FileChooseUtil(context);
        }
        return util;
    }
 
    /**
     * 对外接口  获取uri对应的路径
     *
     * @param uri
     * @return
     */
    public String getChooseFileResultPath(Uri uri) {
        String chooseFilePath = null;
        if ("file".equalsIgnoreCase(uri.getScheme())) {//使用第三方应用打开
            chooseFilePath = uri.getPath();
            Toast.makeText(context, chooseFilePath, Toast.LENGTH_SHORT).show();
            return chooseFilePath;
        }
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {//4.4以后
            chooseFilePath = getPath(context, uri);
        } else {//4.4以下下系统调用方法
            chooseFilePath = getRealPathFromURI(uri);
        }
        return chooseFilePath;
    }
 
    public static String getRealPathFromURI(Uri contentUri) {
        String res = null;
        String[] proj = {MediaStore.Images.Media.DATA};
        Cursor cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
        if (null != cursor && cursor.moveToFirst()) {
            int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            res = cursor.getString(column_index);
            cursor.close();
        }
        return res;
    }
 
    /**
     * 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
     */
    @SuppressLint("NewApi")
    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];
 
                }
            }
            // 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 getDataColumn(context, uri, null, null);
 
        }
        // File
        else if ("file".equalsIgnoreCase(uri.getScheme())) {
            uri.getPath();
 
        }
        return null;
    }
 
    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;
    }
 
    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is ExternalStorageProvider.
     */
    private 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.
     */
    private 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.
     */
    private static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }
}

注意：记得开启手机的读写权限，不然会报权限拒绝异常：SecurityException ！ !   !