How to correctly read a PDF file from the assets folder in an Android application?

Read a PDF File from Assets Folder

Reading a PDF file from an assets folder in an Android application involves some specific steps.

In the provided code, an issue arises with the file path specified for the "abc.pdf" file. The path used, "android.resource://com.project.datastructure/assets/abc.pdf," is incorrect.

To resolve this, follow these steps:

1. Copy the "abc.pdf" file to the application's internal storage: Use the CopyReadAssets() method to copy the file from the assets folder to the internal storage. This ensures that the file is accessible by the application.
2. Specify the correct file path: Instead of using the assets folder path, use the file path in the application's internal storage, which would be Uri.fromFile(file), where file is the File object representing the copied PDF file.
3. Set the correct permissions: Ensure that you include the WRITE_EXTERNAL_STORAGE permission in the application's AndroidManifest.xml file to allow the application to write to the internal storage.

Here's the updated code with the necessary modifications:

<code class="java">public class SampleActivity extends Activity {

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

    private void CopyReadAssets() {
        AssetManager assetManager = getAssets();

        InputStream in = null;
        OutputStream out = null;
        File file = new File(getFilesDir(), "abc.pdf");
        try {
            in = assetManager.open("abc.pdf");
            out = openFileOutput(file.getName(), Context.MODE_WORLD_READABLE);

            copyFile(in, out);
            in.close();
            in = null;
            out.flush();
            out.close();
            out = null;
        } catch (Exception e) {
            Log.e("tag", e.getMessage());
        }

        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType( Uri.fromFile(file), "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);
        }
    }

}</code>

This updated code will correctly copy the "abc.pdf" file to the application's internal storage and use the correct file path to open the PDF in a third-party PDF viewer.

The above is the detailed content of How to correctly read a PDF file from the assets folder in an Android application?. For more information, please follow other related articles on the PHP Chinese website!