Android使用Intent.ACTION_GET_CONTENT选择文件笔记

    public void gotoSelectFile() {
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
//                intent.setType("file");
        //intent.setType(“image/*”);//图片
        //intent.setType(“audio/*”); //音频
        //intent.setType(“video/*”); //视频 
        //intent.setType(“video/*;image/*”);//视频＋图片
        intent.setType("*/*");//无类型限制
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        try {
            startActivityForResult(Intent.createChooser(intent, "选择文件"), 1);
        } catch (android.content.ActivityNotFoundException ex) {
            Toast.makeText(mContext, "未找到文件管理应用，请安装文件管理应用后再试",Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK){
            try {
                String path = "";
                if (Build.VERSION.SDK_INT >= 19) {
                    path = handleImageOnKitKat(mContext, data);
                } else {
                    path = handleImageBeforeKitKat(mContext, data);
                }
                //do somethings
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    @TargetApi(Build.VERSION_CODES.KITKAT)
    public static String handleImageOnKitKat(Context context, Intent data) {
        Uri uri = data.getData();
        if (DocumentsContract.isDocumentUri(context, uri)) {
            String docId = DocumentsContract.getDocumentId(uri);
            if ("com.android.externalstorage.documents".equals(uri.getAuthority())){
                final String[] split = docId.split(":");
                final String type = split[0];

                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/" + split[1];
                }
            } else if ("com.android.providers.media.documents".equals(uri.getAuthority())) {
                String id = docId.split(":")[1];
                String selection = MediaStore.Images.Media._ID + "=" + id;
                String type = docId.split(":")[0];
                Uri contentUri = null;
                if (type.equalsIgnoreCase("image")) {
                    contentUri =  MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                } else if (type.equalsIgnoreCase("audio")) {
                    contentUri =  MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                } else if (type.equalsIgnoreCase("video")) {
                    contentUri =  MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                }
                return getPath(context, contentUri, selection);
            } else if ("com.android.providers.media.downloads.documents".equals(uri.getAuthority())) {
                Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"),
                        Long.valueOf(docId));
                return getPath(context, contentUri, null);
            } else if ("content".equals(uri.getAuthority())) {
                return getPath(context, uri, null);
            }
        }else {
            return uri.getPath();
        }
        return "";
    }

    public static String handleImageBeforeKitKat(Context context, Intent data) {
        Uri uri = data.getData();
        return getPath(context, uri, null);
    }

    private static String getPath(Context context, Uri uri, String selection) {
        String path = null;
        Cursor cursor = context.getContentResolver().query(uri, null, selection, null, null);
        if (cursor != null) {
            if (cursor.moveToFirst()) {
                path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
            }
            cursor.close();
        }
        return path;
    }