android - 如何列出我的 android 设备中的所有 pdf 文件

Question

我找到了这段关于如何获取我所有图像的代码。

谁能告诉我如何在内部存储和外部存储中只获取 .pdf 文件？

final String[] columns = { MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID };
    final String orderBy = MediaStore.Images.Media._ID;
    //Stores all the images from the gallery in Cursor
    Cursor cursor = getContentResolver().query(
            MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null,
            null, orderBy);
    //Total number of images
    int count = cursor.getCount();

    //Create an array to store path to all the images
    String[] arrPath = new String[count];

    for (int i = 0; i < count; i++) {
        cursor.moveToPosition(i);
        int dataColumnIndex = cursor.getColumnIndex(MediaStore.Images.Media.DATA);
        //Store the path of the image
        arrPath[i]= cursor.getString(dataColumnIndex);
        Log.i("PATH", arrPath[i]);
    } 

Answer 1

可能的解决方案是转到每个文件夹并检查 .pdf 是否存在，如果存在，您可以对该文件做任何您想做的事情

public void Search_Dir(File dir) {
  String pdfPattern = ".pdf";

File FileList[] = dir.listFiles();

if (FileList != null) {
    for (int i = 0; i < FileList.length; i++) {

        if (FileList[i].isDirectory()) {
            Search_Dir(FileList[i]);
        } else {
          if (FileList[i].getName().endsWith(pdfPattern)){
                              //here you have that file.

          }
        }
    }
  }    
}

函数调用将是

Search_Dir(Environment.getExternalStorageDirectory());