由网友(傲慢与你)分享简介：我写打开一个PDF文件，当你点击一个按钮的应用程序。下面是我的code：I am writing an application that opens a pdf file when you click a button. Below is my code:File pdfFile = new File("andro...

我写打开一个PDF文件，当你点击一个按钮的应用程序。下面是我的code：

I am writing an application that opens a pdf file when you click a button. Below is my code:

File pdfFile = new File(
                        "android.resource://com.dave.pdfviewer/"
                                + R.raw.userguide);
                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);

然而，当我运行它，preSS按钮，它说：该文件无法打开，因为它不是一个有效的PDF文件。这是推动我疯了。我是否正确地访问文件？有任何想法吗？谢谢

However when I run it and press the button it says "The document cannot be opened because its is not a valid PDF document". This is driving me mad. Am I accessing the file correctly? Any ideas? Thanks

推荐答案

您必须从资产的文件夹中的PDF格式复制到SD卡的文件夹。

You have to copy the pdf from assets folder to sdcard folder.

.....
copyFile(this.getAssets().open("userguide.pdf"), new FileOutputStream(new File(getFilesDir(), "yourPath/userguide.pdf")));

File pdfFile = new File(getFilesDir(), "yourPath/userguide.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);


}

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);
        }
    }