单击 recyclerView 时打开文件（pdf、mp3、mp4、...）

Question

我有一个 RecyclerView 显示应用程序目录中存在的文件列表。现在，当用户单击特定行时，该文件将打开。

这是我的 RecyclerView 的截图：

这是我的适配器代码的 viewHolder：

// ===========================  ViewHolder ==========================

    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        private TextView txtTitle;
        private ImageView imgDelete;

        public ViewHolder(View itemView) {
            super(itemView);
            itemView.setOnClickListener(this);
            txtTitle = (TextView) itemView.findViewById(R.id.txt_file_title);
            imgDelete = (ImageView) itemView.findViewById(R.id.img_delete_row_show);
        }

        @Override
        public void onClick(View v) {
            Toast.makeText(v.getContext(), txtTitle.getText(), Toast.LENGTH_SHORT).show();
            //?????
        }
    }

Answer 1

您需要在 onClick(View v) 方法中使用以下代码

       //For pdf file
         file = new File ("/mnt/sdcard/test.pdf");
         Intent intent = new Intent(Intent.ACTION_VIEW);
         intent.setDataAndType(path, "application/pdf");
         intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
         startActivity(intent);

     // for mp3 file

         file = new File ("/mnt/sdcard/test.mp3");
         Intent intent = new Intent(Intent.ACTION_VIEW);
         intent.setDataAndType(path,  "audio/*");
         intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
         startActivity(intent);

在文件对象中设置文件的路径，并将适当的MIME类型作为intent.setDataAndType()方法的第二个参数，你就可以开始了

Answer 2

这是这项工作的最佳解决方案，(Source)

// ===========================  ViewHolder ==========================
    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        private TextView txtTitle;
        private ImageView imgDelete;

        public ViewHolder(View itemView) {
            super(itemView);
            itemView.setOnClickListener(this);
            txtTitle = (TextView) itemView.findViewById(R.id.txt_file_title);
            imgDelete = (ImageView) itemView.findViewById(R.id.img_delete_row_show);
        }

        @Override
        public void onClick(View v) {

            String selectedFilePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Android/data/my.package.name/files/downloaded/" + txtTitle.getText().toString();
            File file = new File(selectedFilePath);
            try {
                FileOpen.openFile(v.getContext(),file);
            } catch (IOException e) {
                e.printStackTrace();
            }


        }
    }

这是处理所有格式的 Helper 类：

public class FileOpen {

    public static void openFile(Context context, File url) throws IOException {
        // Create URI
        File file=url;
        Uri uri = Uri.fromFile(file);

        Intent intent = new Intent(Intent.ACTION_VIEW);
        // Check what kind of file you are trying to open, by comparing the url with extensions.
        // When the if condition is matched, plugin sets the correct intent (mime) type,
        // so Android knew what application to use to open the file
        if (url.toString().contains(".doc") || url.toString().contains(".docx")) {
            // Word document
            intent.setDataAndType(uri, "application/msword");
        } else if(url.toString().contains(".pdf")) {
            // PDF file
            intent.setDataAndType(uri, "application/pdf");
        } else if(url.toString().contains(".ppt") || url.toString().contains(".pptx")) {
            // Powerpoint file
            intent.setDataAndType(uri, "application/vnd.ms-powerpoint");
        } else if(url.toString().contains(".xls") || url.toString().contains(".xlsx")) {
            // Excel file
            intent.setDataAndType(uri, "application/vnd.ms-excel");
        } else if(url.toString().contains(".zip") || url.toString().contains(".rar")) {
            // WAV audio file
            intent.setDataAndType(uri, "application/x-wav");
        } else if(url.toString().contains(".rtf")) {
            // RTF file
            intent.setDataAndType(uri, "application/rtf");
        } else if(url.toString().contains(".wav") || url.toString().contains(".mp3")) {
            // WAV audio file
            intent.setDataAndType(uri, "audio/x-wav");
        } else if(url.toString().contains(".gif")) {
            // GIF file
            intent.setDataAndType(uri, "image/gif");
        } else if(url.toString().contains(".jpg") || url.toString().contains(".jpeg") || url.toString().contains(".png")) {
            // JPG file
            intent.setDataAndType(uri, "image/jpeg");
        } else if(url.toString().contains(".txt")) {
            // Text file
            intent.setDataAndType(uri, "text/plain");
        } else if(url.toString().contains(".3gp") || url.toString().contains(".mpg") || url.toString().contains(".mpeg") || url.toString().contains(".mpe") || url.toString().contains(".mp4") || url.toString().contains(".avi")) {
            // Video files
            intent.setDataAndType(uri, "video/*");
        } else {
            //if you want you can also define the intent type for any other file

            //additionally use else clause below, to manage other unknown extensions
            //in this case, Android will show all applications installed on the device
            //so you can choose which application to use
            intent.setDataAndType(uri, "*/*");
        }

        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent);
    }
}