Question

我使用此代码在sdcard中创建一个文件夹，它是创建的

private void CreateFolder() {
    File folder = new File(Environment.getExternalStorageDirectory() +
            File.separator + "Books");
    boolean success = true;
    if (!folder.exists()) {
        success = folder.mkdir();
    }
    if (success) {
        Toast.makeText(MainActivity.this, "Books Folder Created", Toast.LENGTH_SHORT).show();
    } else {
        // Do something else on failure
        Toast.makeText(MainActivity.this, "Fail", Toast.LENGTH_SHORT).show();


    }

}

这些代码行将文件从res / raw复制到此文件夹但这不能复制该文件夹中指定的pdf文件

 try{
                copyFile(getResources().openRawResource(R.raw.the_reader)
                , new FileOutputStream(new File(context.getFilesDir(),"/sdcard/Books/the_reader.pdf")));
                }
                catch (IOException e) {
                    e.printStackTrace();
                    Toast.makeText(context,"Fail",Toast.LENGTH_LONG).show();
                }



                File pdfFile = new File(context.getFilesDir(), "/sdcard/Books/the_reader.pdf");
                Uri path = Uri.fromFile(pdfFile);
                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                intent.setDataAndType(path, "application/pdf");
                startActivity(intent);

复制文件代码

private void copyFile(InputStream in, OutputStream out) throws IOException {
        byte[] buffer = new byte[1024];
        int read;
        while((read = in.read(buffer)) != -1){
            out.write(buffer, 0, read);
        }
}

但是清单

中还添加了无法复制权限的功能

 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

它无法复制指定文件夹中的pdf文件...

Answer 1

copyFile方法的一些更改：

public void copy(InpputStream in, OutputStream out) throws IOException {
    byte[] buffer = new byte[1024];
    int read;
    while ((read = in.read(buffer)) > 0) {
        out.write(buffer, 0, read);
    }
    in.close();
    out.close();
}

无法将pdf文件从原始文件复制到运行时创建的sdcard文件夹

1 个答案: