Question

我试图在我的Android应用程序上显示不同类型的文件，但它只适用于PDF文件，当我尝试显示任何其他类型的文件时。我收到一个错误说：

无法显示pdf，文件格式无效

以下是我的代码片段：

  else if (currentFile.toString().contains(".pdf")) {

  String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(".PDF");
  Intent intent = new Intent();
  intent.setAction(android.content.Intent.ACTION_VIEW);
  intent.setDataAndType(Uri.fromFile(currentFile), mime);
  startActivityForResult(intent, 10);

} else if (currentFile.toString().contains(".doc")||currentFile.toString().contains(".docx")) {

  String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(".doc");

  Intent intent = new Intent();
  intent.setAction(android.content.Intent.ACTION_VIEW);
  intent.setDataAndType(Uri.fromFile(currentFile), mime);
  startActivityForResult(intent, 10);

} else if (currentFile.toString().contains(".jpg") || currentFile.toString().contains(".jpeg") || currentFile.toString().contains(".png")){
   String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(".jpg");

  Intent intent = new Intent();
  intent.setAction(android.content.Intent.ACTION_VIEW);
  intent.setDataAndType(Uri.fromFile(currentFile), mime);
  startActivityForResult(intent, 10);
}

Answer 1

我可以自己找到解决方案，这里是我使用过的代码片段

private void openFile(File currentFile, String fileFormat) {
    Intent intent = new Intent();
    intent.setAction(android.content.Intent.ACTION_VIEW);
    intent.setDataAndType(Uri.fromFile(currentFile),fileFormat);
    startActivity(intent);
}

我将此方法称为：

...........

                } else if (currentFile.toString().contains(".pdf"))
                openFile(currentFile,"application/pdf");

             else if (currentFile.toString().contains(".doc") || currentFile.toString().contains(".docx"))
                openFile(currentFile,"application/msword");

             else if (currentFile.toString().contains(".jpg") ||
                    currentFile.toString().contains(".jpeg") || currentFile.toString().contains(".png"))
                openFile(currentFile,"image/jpeg");
             else if(currentFile.toString().contains(".ppt") || currentFile.toString().contains(".pptx"))
                 // Powerpoint file
                openFile(currentFile,"application/vnd.ms-powerpoint");
             else if(currentFile.toString().contains(".xls") || currentFile.toString().contains(".xlsx"))
                // Excel file
                openFile(currentFile, "application/vnd.ms-excel");
              else if(currentFile.toString().contains(".zip") || currentFile.toString().contains(".rar"))
                // WAV audio file
                openFile(currentFile,"application/x-wav");

             else if(currentFile.toString().contains(".rtf"))
                // RTF file
                openFile(currentFile,"application/rtf");

             else if(currentFile.toString().contains(".wav") || currentFile.toString().contains(".mp3"))
                // WAV audio file
                openFile(currentFile,"audio/x-wav");

             else if(currentFile.toString().contains(".gif"))
                // GIF file
                openFile(currentFile,"image/gif");
             else if(currentFile.toString().contains(".txt"))
                // Text file
                openFile(currentFile,"text/plain");

在我的Android应用

1 个答案: