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java - 无法在存储android 10中打开PDF文件

问题描述

我在下载存储中有一个 pdf 文件，我尝试使用意图显示它，我已经有三个 PDF 查看器应用程序，但它们都没有成功显示该文件，但如果我直接通过文件资源管理器打开 pdf，它的显示就好了。

这是我的代码：

File kuda = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
File file1 = new File(kuda,"KK.pdf");

Intent intent = new Intent(Intent.ACTION_VIEW);
Uri uri= FileProvider.getUriForFile(getContext(), BuildConfig.APPLICATION_ID+".provider",file1);
            
intent.setDataAndType(uri, "application/pdf");                
intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY | Intent.FLAG_GRANT_READ_URI_PERMISSION);
startActivity(intent);

我的清单：

 <provider
        android:name="androidx.core.content.FileProvider"
        android:authorities="${applicationId}.provider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths"/>
  </provider>

提供者路径：

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
 <external-path name="external_files" path="Download/"/>
 <files-path name="files" path="files/" />
</paths>

我正在使用安卓 10

请帮忙。谢谢

标签： javaandroid

解决方案

是的，在 OS 10 之后情况发生了变化，你必须以新的方式编写逻辑。在我的应用程序中使用改造和使用那些字节 [] 得到一些响应的示例。将此代码放入您的 android 组件（例如活动）中。调用 viewModel.getPdfBytes() 是来自后端的响应！

private static final int CREATE_FILE = 23;

 private void saveFileToStorageIntent() {
        Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        intent.setType(MimeTypeMap.getSingleton().getMimeTypeFromExtension("pdf"));
        intent.putExtra(Intent.EXTRA_TITLE, getString(R.string.text_export_pdf_file_first) + getDateString() + getString(R.string.text_export_pdf_file));
        startActivityForResult(intent, CREATE_FILE);
    }

 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == CREATE_FILE) {
            if (resultCode == Activity.RESULT_OK && data != null) {
                writePDFToFile(data.getData(), viewModel.getPdfBytes());
            }
        }
    }



private void writePDFToFile(Uri uri, ResponseBody body){
        InputStream inputStream = null;
        OutputStream outputStream = null;
        try {
            byte[] fileReader = new byte[4096];

            long fileSize = body.contentLength();
            long fileSizeDownloaded = 0;

            inputStream = body.byteStream();
            outputStream = getContentResolver().openOutputStream(uri);

            while (true) {
                int read = inputStream.read(fileReader);

                if (read == -1) {
                    break;
                }
                outputStream.write(fileReader, 0, read);
                fileSizeDownloaded += read;
                Logger.print(TAG, "file download: " + fileSizeDownloaded + " of " + fileSize);
            }
            outputStream.flush();
            openFileWithIntent(uri,"pdf", getString(R.string.open_file));
        } catch (Exception e) {
            Logger.print(TAG, e.getMessage());
        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (outputStream != null) {
                try {
                    outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }




private void openFileWithIntent(Uri fileUri, String typeString, String openTitle) {
        Intent target = new Intent(Intent.ACTION_VIEW);
        target.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
        target.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        target.setDataAndType(
                fileUri,
                MimeTypeMap.getSingleton().getMimeTypeFromExtension(typeString)
        ); // For now there is only type 1 (PDF).
        Intent intent = Intent.createChooser(target, openTitle);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        }
        try {
            startActivity(intent);
        } catch (ActivityNotFoundException e) {
            if (BuildConfig.DEBUG) e.printStackTrace();
            Toast.makeText(context, getString(R.string.error_no_pdf_app), Toast.LENGTH_SHORT).show();
            FirebaseCrashlytics.getInstance().log(getString(R.string.error_no_pdf_app));
            FirebaseCrashlytics.getInstance().recordException(e);
        }
    }

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