How to Display PDF Files in Android Applications?

How to Render a PDF in Android

In Android applications, rendering PDF files allows users to view and interact with portable document formats. Here's how to achieve this functionality:

Convert Byte Stream to PDF

First, convert the received byte stream into a PDF file. You can use a library like iText or Apache PDFBox to create the PDF file on the device's memory. Save the file in a location accessible to your application.

Rendering the PDF

To render the PDF on an activity, you can use the following approach:

1. Check for Pre-Installed PDF Viewers: Some devices may have PDF viewer applications pre-installed, such as Quickoffice. If such an application exists, you can send an Intent to open it with the PDF file path.
2. Use an External PDF Viewer: If a pre-installed PDF viewer is not available, you can use an Android Activity to open a PDF file using an external application. Here's a sample code snippet:

public class OpenPdf extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button button = (Button) findViewById(R.id.OpenPdfButton);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                File file = new File("/sdcard/example.pdf");

                if (file.exists()) {
                    Uri path = Uri.fromFile(file);
                    Intent intent = new Intent(Intent.ACTION_VIEW);
                    intent.setDataAndType(path, "application/pdf");
                    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

                    try {
                        startActivity(intent);
                    } 
                    catch (ActivityNotFoundException e) {
                        Toast.makeText(OpenPdf.this, 
                            "No Application Available to View PDF", 
                            Toast.LENGTH_SHORT).show();
                    }
                }
            }
        });
    }
}

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