How to open a PDF file from the assets folder in Android and avoid the \'The file path is not valid\' error?

Reading a PDF File from Assets Folder

Introduction

This article provides a solution to an issue where attempting to open a PDF file from the assets folder using an intent results in a "The file path is not valid" error message.

Problem Description

The original code attempts to access a PDF file in the assets folder using the following path:

<code class="java">File file = new File("android.resource://com.project.datastructure/assets/abc.pdf");</code>

However, this path is incorrect, as it does not account for the actual location of the PDF file within the app's directory structure.

Solution

To resolve this issue, we can use the following updated code:

<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.parse("file://" + getFilesDir() + "/abc.pdf"),
                "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 code first copies the PDF file from the assets folder to the app's private storage directory, using a FileOutputStream to ensure it can be accessed by other applications. It then creates an Intent to open the PDF file from the private storage directory, which resolves the issue of the invalid file path.

Permissions

To copy files to the private storage directory, it is necessary to include the following permission in the AndroidManifest.xml file:

<code class="xml"><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /></code>

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