Android Studio -从默认目录应用程序(以编程方式)打开epub + pdf文件

implementation 'nl.siegmann.epublib:epublib-core:3.1'

import nl.siegmann.epublib.domain.Book;
import nl.siegmann.epublib.domain.Resource;
import nl.siegmann.epublib.epub.EpubReader;

import java.io.FileInputStream;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {
    private WebView webView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        webView = findViewById(R.id.webView);

        try {
            // 从文件中读取epub文件
            FileInputStream epubFile = new FileInputStream("path/to/your/epub/file.epub");
            Book book = (new EpubReader()).readEpub(epubFile);

            // 获取epub文件的内容
            String htmlContent = "";
            List<Resource> contents = book.getContents();
            for (Resource resource : contents) {
                htmlContent += new String(resource.getData());
            }

            // 在WebView中显示epub文件的内容
            webView.loadDataWithBaseURL(null, htmlContent, "text/html", "UTF-8", null);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

implementation 'com.github.barteksc:android-pdf-viewer:3.2.0-beta.1'

import com.github.barteksc.pdfviewer.PDFView;

public class MainActivity extends AppCompatActivity {
    private PDFView pdfView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        pdfView = findViewById(R.id.pdfView);

        // 加载并显示pdf文件
        pdfView.fromAsset("your_pdf_file.pdf")
                .load();
    }
}