在android中选择文件后找不到文件错误

Question

我想在我的 android 应用程序中打开一个 .pdf 文件。现在我可以浏览该 pdf 文件，并且在浏览该文件后我得到 File Not Found 错误时我检查文件是否存在。现在选择文件后，我选择的文件 Uri data.getData() 就像

content://com.android.externalstorage.documents/document/6333-6131:SHIDHIN.pdf

当我使用data.getData().getPath().toString() 解析时的路径就像

/document/6333-6131:SHIDHIN.pdf 这是我的代码。请帮帮我。

// To Browse the file

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("application/pdf");
startActivityForResult(intent, PICK_FILE_REQUEST);

选择文件后

//onActivityResult

public void onActivityResult(final int requestCode, int resultCode, Intent data) {
    try {
        switch (requestCode) {
            case PICK_FILE_REQUEST:
                if (resultCode == RESULT_OK) {
                    try {
                        Uri fileUri = data.getData();
                        String path  = fileUri.getPath().toString();
                        File f = new File(path);
                        if (f.exists()) {
                            System.out.println("\n**** Uri :> "+fileUri.toString());
                            System.out.println("\n**** Path :> "+path.toString());
                            final Intent intent = new Intent(MainActivity.this, ViewPdf.class);
                            intent.putExtra(PdfViewerActivity.EXTRA_PDFFILENAME, path);
                            startActivity(intent);
                        } else {
                            System.out.println("\n**** File Not Exist :> "+path);
                        }

                    } catch (Exception e) {
                        ShowDialog_Ok("Error", "Cannot Open File");
                    }
                }
                break;
        }
    } catch (Exception e) {
    }
}

Answer 1

button.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        File pdfFile = new File(Environment.getExternalStorageDirectory(), "Case Study.pdf");

        try {
            if (pdfFile.exists()) {
                Uri path = Uri.fromFile(pdfFile);
                Intent objIntent = new Intent(Intent.ACTION_VIEW);
                objIntent.setDataAndType(path, "application/pdf");
                objIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(objIntent);
            } else {
                Toast.makeText(MainActivity.this, "File NotFound", Toast.LENGTH_SHORT).show();
            }
        } catch (ActivityNotFoundException e) {
            Toast.makeText(MainActivity.this, "No Viewer Application Found", Toast.LENGTH_SHORT).show();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
});

Answer 2

这不是答案，而是一种解决方法。

File file = new File("some_temp_path"); # you can also use app's internal cache to store the file
FileOutputStream fos = new FileOutputStream(file);

InputStream is = context.getContentResolver().openInputStream(uri);
byte[] buffer = new byte[1024];
int len = 0;
try {
    len = is.read(buffer);
    while (len != -1) {
        fos.write(buffer, 0, len);
        len = is.read(buffer);
    }

    fos.close();
} catch (IOException e) {
    e.printStackTrace();
}

将此文件的绝对路径传递给您的活动。