How to Read a PDF File from the Assets Folder in an Android App?

Read a PDF File from Assets Folder

This article addresses the issue of reading a PDF file from an assets folder within an Android application. Users attempting to access the PDF encounter the error message "The file path is not valid."

Code Analysis

The provided code retrieves the PDF file from the assets folder. However, the path specified for opening the PDF in the Intent references the assets folder, which may cause issues with permissions and access.

Solution

To resolve this issue, consider the following code:

public class SampleActivity extends Activity {<pre class="brush:php;toolbar:false">@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();
        out.flush();
        out.close();
    } catch (Exception e) {
        Log.e("tag", e.getMessage());
    }

    Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.setDataAndType(Uri.parse("file://" + getFilesDir() + "/abc.pdf"), "application/pdf");

    //Grant permission to the user after confirming existence of the file
    if (file.exists()) {
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
        try {
            getApplicationContext().startActivity(intent);
        } catch (ActivityNotFoundException e) {
            Toast.makeText(this, "NO PDF Viewer", Toast.LENGTH_SHORT).show();
        }
    }
}

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);
    }
}

}

Explanation

• This code reads the PDF file from the assets folder into a file within the app's internal storage.
• The path in the Intent is now updated to point to the file in the internal storage, ensuring access permissions.
• This approach eliminates the "The file path is not valid" error.

Additional Considerations

• Ensure the WRITE_EXTERNAL_STORAGE permission is granted in the manifest file.
• Make sure the PDF file exists in the specified location within the assets folder.

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